1. What is the difference between Eima EOLO STAR 24 3C price 7800 and MINI EOLO 24 3C8800?
EOLO STAR 24 3C is a tube-in-tube heat exchanger that produces hot water quickly but is not stable enough.
The EOLO MINI 24 3C is a plate exchanger. The water is more stable and does not turn cold and hot.
The second is the rated thermal output power of the EOLO STAR is 23.8KW, and the thermal output power of the MINI EOLO is 24KW.
2. Why is the coil spacing 17.5cm?
17.5 is the national standard, that is, the room temperature reaches the basic temperature (20°) you need. The coil spacing is 17.5cm. If you want a higher temperature, you can narrow the coil spacing, but the corresponding cost will increase.
3. The number of thermostat rules: a guest restaurant, kitchen and bathroom generally do not put, one each other.
4. One set of water 2 sets of end fittings, one water separator for two basic interfaces, one water separator for one solenoid valve.
5. The distance between the boiler and the ground is 2 meters.
6. Ima's thermal energy consumption is 95%, domestic thermal energy consumption is about 88%.
7. What kind of heat sink material is good?
a. Steel Radiator (Kaimei Steel Plate Radiator, Nuoro Tianjiao Series)
1) High metal strength, strong pressure resistance, beautiful appearance and neat appearance, easy installation and maintenance, fast heat dissipation, low water temperature can also dissipate heat as usual, and it is easy to realize mechanized production.
2) Steel cooling requires long service life in an independent heating system, and corrosion resistance does not deteriorate. To add well water or tap water when heating is used, it is best to quickly deoxidize the water in the entire system. The deoxidized water will not cause oxidation to the radiator system, and only need to make up for the lack of water in the system. If enough water is available, never use any hot water in the system. If you continuously use the hot water inside the system and recharge the raw water, the oxygen contained in the newly added water will be fatal to the radiator and the entire system. Corrosion. After the heating is completed, use the original water to maintain the entire system. Many customers who do not know how to remove oxygen will enter the heating system and cause oxidation corrosion. This system will leak quickly and cannot be used within a few years. Independent heating radiators are best choices for low carbon steel radiators, and the best internal anti-corrosion radiators (not the best number of anti-corrosion, this is a misunderstanding, the best anti-corrosion is the longest life It is 10 to 9 years, and it is done according to working procedures to achieve the best results, but the cost will increase a lot. The anti-corrosion will be too thick and the inner wall of the radiator will fall off. The main reason is that the radiator cannot be synchronically increased and contracted. Like paint, a thick brush will burst a single point.) But good carbon steel radiators can be protected from corrosion inside or inside the heating system, if the central heating steel radiator is used for antisepsis and not for antisepsis There is no great influence. If the anti-corrosion is not good, it will also cause fatal damage to the radiator. We can see that the interior of the central heating pipe is not preserved. When you cut the original iron pipe, you will find that there is a cluster of black mucous on the inner wall of the pipe. There is no rust and corrosion. The main heating water is deoxidation and softening. However, manufacturers are now doing anti-corrosion.
b. Aluminum Radiator 1) With the advantages of high thermal efficiency, rapid heating, beautiful appearance, energy saving and material saving, etc., along with people's requirements for radiator decoration, controllability, economy, etc., rapid development has been achieved in recent years.
2) In the European countries such as Italy and Spain, which are mainly independent heating of low-temperature hot water radiators, aluminum radiators account for most of the market share with their elegant artistic taste and excellent performance.
3) The main drawback is the fear of alkali corrosion. However, for the independent heating system, the system water is neutral to weakly acidic, and its impact is severe. Mainly aging is short and short-lived. The higher the water temperature, the faster the aging.
c. Copper-aluminum composite radiator 1) The copper pipe is a water-passing part, which is a radiator with Chinese characteristics. The biggest advantage is that it is resistant to acid corrosion. It also has some characteristics of a light radiator and is more suitable for use in an independent heating system. Compared with aluminum radiators, copper-aluminum composite radiators use relatively scarce copper materials, and radiators are expensive.
2) The shape is relatively simple, and the shape cannot be made into various artistic shapes like the aluminum radiator; it mainly depends on convection heat dissipation. When the water temperature is higher, the heat dissipation performance can be better exerted.
8. How is the Polyline PE-XB floor heating pipe?
â—Ž The German Poly pipeline is a PE-Xb pipeline and is a silane-crosslinked polyethylene pipeline.
â—Ž is the world's leading plastic material.
â—Ž is a memory material. (In the connection process, special PE-XB pipe connection fittings can be used. No need to use silicone O-rings)
â—Ž It is a pipe with anti-permeation function.
â—Ž It is a pipeline that passes the authoritative certification WRAS certification and can be used for 85 degree hot water system.
â—Ž It is a plastic pipe with small creep and longest material life.
â—Ž The pipe connecting pipe is made of copper material. It is a pipe that does not need other materials to ensure that the connection will not leak water.
â—Ž It is a pipe with high temperature resistance, noise reduction, strong anti-aging and chemical resistance.
9. REHAU PE-XA floor heating pipe features?
German Reheater floor heating pipe, RARTITAN pink heating pipe made of high pressure cross-linked RAU-VPE (PE-Xa) is the core component of all floor heating installation systems. It is not only resistant to high pressure, but also strong and durable. Because the outer surface of the pipe is coated with a protective layer composed of polyvinyl alcohol (PAU-EVAL), the pipe has anti-oxygen permeability. Another advantage of REHAU floor heating pipes is the long-lasting and leak-free tightening of the collar connection system. According to the DIN 18380 standard, this quick and easy connection can be embedded in cement, concrete, and plaster. The strength and final condition of each connection point can be easily checked visually. The PAUTITAN pink heating pipes can be connected to reduce the waste of the pipes.
10. Application and Features of PERT PEX in Floor Heating
PE-X: Domestic production generally adopts medium density polyethylene or high density polyethylene and silane crosslinking or peroxide crosslinking method. It is the chemical bond between the linear long molecular chains of polyethylene, forming a three-dimensional network molecular chain structure. Compared to general polyethylene, tensile strength, heat resistance, aging resistance, stress crack resistance, and dimensional stability are improved. The entire production process is a chemical reaction process. The floor heating type has difficulties in that the cross-linking agent is not easily dispersed uniformly, the cross-linking degree is difficult to control and the screw needs to be periodically cleaned to prevent the generation of gel particles, and the quality control of the product is difficult, and it is difficult for a general small-scale production enterprise to do well. The qualified PE-X pipe has the advantages of good mechanical properties, high temperature resistance and low temperature performance. However, PE-X pipes have no thermoplastic properties and cannot be joined and repaired by hot melt welding.
PP-B: Good low temperature resistance, high flexural modulus, excellent connection performance, and low raw material costs. But in the floor heating system design pressure of 0.6MPa need to use S3.2 series of pipe (PE-X, PP-R, PB and PE-RT, etc. need to select S5), de20 pipe wall thickness of 2.8mm, relative diameter Reduced 1.6mm in PE-X, PP-R, PB and PE-RT varieties. Heat resistance is poor compared to other products. Raw material manufacturers have not yet made creep failure curves.
PP-R: good high temperature resistance, good mechanical properties and excellent connection performance. In Europe, there are several companies that have a qualified creep failure curve. However, the low temperature impact resistance is poor.
PB: Excellent creep resistance and mechanical properties, and the softest of several floor heating pipes, the thinnest wall thickness is designed and calculated at the same design pressure. Under the same conditions of use, the same wall thickness series of pipe, the use of the highest safety of the species. However, the raw material price is the highest, which is more than double that of other varieties. Currently, there is less area for application in China.
PE-RT: The floor heating material is a medium-density polyethylene with very stable mechanical properties, which is formed by metallocene catalyzed copolymerization of ethylene and octene monomers. Its unique ethylene main chain and octene short-branched structure make it have ethylene superior toughness, stress crack resistance, low temperature impact resistance, outstanding long-term hydrostatic pressure resistance and octene heat-resistant creep performance. It can be connected by hot melt connection. It can be damaged accidentally or it can be repaired by hot melt connection. The floor heating raw material has a creep failure curve that meets the product standard, and is the only one that can be used for the hot water pipe in the polyethylene at the present stage without cross-linking. However, its processing range is narrow and quality control is difficult.
11. The effect of different specifications of the floor heating pipe on floor heating 1. From the perspective of HVAC design: 1. The difference in the amount of heat dissipation Under normal circumstances, the temperature of the supply and return water is 55~45°C, and the indoor temperature is 20°C. The floor material is made of wood floor and the pipe spacing is At 200mm, the heat dissipation of PEX tubes of dn16 and dn20 is 90.2 w/m2 and 112.7 w/m2, respectively. The heat dissipation of dn20 tube is about 20% larger than that of dn16 tube under the same conditions. (The data is selected from the “Technical Specification for Terrestrial Radiant Heating.†At present, the energy efficiency standard for residential buildings in China is not more than 52 w/m2 on average, and Beijing Municipality provides an average of no more than 32 w/m2. From the above data, it can be seen that the heat dissipation of the pipes of dn16 The amount has fully met the heat load requirements. 2. The difference in flow resistance is based on a single loop flow rate of 130kg/h, dn16 pipe resistance loss is 164Pa/m, dn20 pipe resistance loss is 50Pa/m, and 100m length calculation resistance is 16400Pa and 5000Pa respectively (without partial resistance With the water collector resistance). Floor heating resistance requirements should be within 30kPa, both under normal circumstances will not exceed. However, under actual conditions, due to the pump selection and other issues (see below), the dn20 pipe will work under the condition of large flow and small temperature difference, that is, the actual transmission loss is not much different. Moreover, under the condition of separate heating, the terminal resistance is not necessarily as small as possible. Appropriately increasing the terminal resistance can well overcome the phenomenon of hydraulic imbalance in the system, and it is also easy for the components of the small system to balance between the water collectors. For the heating system of the heating system, the head of the indoor system is usually set at 30kPa. 3. The flow rate in the pipe is 130kg/h above the single loop flow rate, 0.33m/s in the dn16 pipe, and 0.2m/s in the dn20 pipe. According to the “Technical Specification for Radiant Floor Heatingâ€, the flow rate in the floor heating pipe must not be low. At 0.25m/s, in this case, the actual working condition of the dn20 pipe should be to increase the flow and reduce the temperature difference operation. 4. In actual engineering applications, the pipes of dn16 in cold regions such as Harbin and Xinjiang also fully satisfy the heating effect. Only in a few cases where the parameters are limited, such as excessive load, excessively low head pressure, etc., it is technically required to use dn20 tubes. Second, the pressure capacity of the pipe for the same kind of pipe under the same wall thickness, the smaller pipe diameter bearing capacity than the larger diameter. Because: Different types of pipe thermal strength test based on ring stress, the same pipe under the same test conditions, the same test ring stress, but the actual pressure of the pipe is different. The relationship is as follows: P = 2 бе / D ее P: Test pressure (Mpa) б: Ring stress (Mpa) е: Tube wall thickness (MM) D: Tube outer diameter (MM) The above formula shows that the same kind of pipe is different The pressure of the size is different. Taking floor heating condition classifying four as an example, its allowable use of ring stress σ is 4.0 MPa, calculated according to the above formula, dn16 pipe: P = 2 бе / D е е = 1.14 MPa dn20 pipe: P = 2 бе / D ? е=0.89MPa III. Construction 1. Effect on the thickness of the cushion: The “Technical Specification for Radiant Heating of the Ground†stipulates that the thickness of the cushion on the pipe must not be less than 3cm, ie, the thickness of the dn20 pipe cushion is theoretically thicker than that of the dn16 pipe. 4mm. At the same time, with the increase of the pipe diameter, the possibility of cracking of the cushion along the pipe wall is also increased. 2, the surface temperature uniformity: In order to ensure the match of heat, under the same circumstances, with dn20 tube spacing greater, the greater the spacing, the more uneven surface temperature.
12. What kind of heat sink material is better?
1, cast iron radiator
1) Simple structure, good corrosion resistance, long service life, low price, stable performance;
2) The water capacity is large, the thermal inertia is large, and the temperature rise is slow, which cannot meet the requirements of the corresponding rapid speed of the independent heating system;
3) Cast iron radiators often have energy and pig iron consumption in the production process, and the environmental pollution is quite serious.
4) Casting sand in the inner cavity of the cast iron radiator will often have an adverse effect on the life of the fireplace and the operation of the control instrument. Therefore, cast iron radiators are not suitable for use in independent heating systems. A long time the appearance of rusty, gaskets generally seepage.
2, steel radiator
1) High metal strength, strong pressure resistance, beautiful appearance and neat appearance, easy installation and maintenance, fast heat dissipation, low water temperature can also dissipate heat as usual, and it is easy to realize mechanized production.
2) Steel cooling requires long service life in an independent heating system. Corrosion resistance is not ageing. To add well water or tap water when heating is used, it is best to quickly deoxidize the water in the entire system. The deoxidized water will not cause oxidation to the radiator system, and only need to make up for the lack of water in the system. If enough water is available, never use any hot water in the system. If you continuously use the hot water inside the system and recharge the raw water, the oxygen contained in the newly added water will be fatal to the radiator and the entire system. Corrosion. After the heating is completed, use the original water to maintain the entire system. Many customers who do not know how to remove oxygen will enter the heating system and cause oxidation corrosion. This system will leak quickly and cannot be used within a few years. Independent heating radiators are best choices for low carbon steel radiators, and the best internal anti-corrosion radiators (not the best number of anti-corrosion, this is a misunderstanding, the best anti-corrosion is the longest life It is 10 to 9 years, and it is done according to working procedures to achieve the best results, but the cost will increase a lot. The anti-corrosion will be too thick and the inner wall of the radiator will fall off. The main reason is that the radiator cannot be synchronically increased and contracted. Like paint, a thick brush will burst a single point.) But good carbon steel radiators can be protected from corrosion inside or inside the heating system, if the central heating steel radiator is used for antisepsis and not for antisepsis There is no great influence. If the anti-corrosion is not good, it will also cause fatal damage to the radiator. We can see that the interior of the central heating pipe is not preserved. When you cut the original iron pipe, you will find that there is a cluster of black mucous on the inner wall of the pipe. There is no rust and corrosion. The main heating water is deoxidation and softening. However, manufacturers are now doing anti-corrosion.
3 aluminum radiator
1) With the advantages of high thermal efficiency, rapid heating, beautiful appearance, energy saving and material saving, etc., along with people's requirements for radiator decoration, controllability, economy, etc., rapid development has been achieved in recent years.
2) In the European countries such as Italy and Spain, which are mainly independent heating of low-temperature hot water radiators, aluminum radiators account for most of the market share with their elegant artistic taste and excellent performance.
3) The main drawback is the fear of alkali corrosion. However, for the independent heating system, the system water is neutral to weakly acidic, and its impact is severe. Mainly aging is short and short-lived. The higher the water temperature, the faster the aging.
3, copper and aluminum composite radiator
1) The copper pipe is a water-passing part, which is a radiator with Chinese characteristics. The biggest advantage is that it is resistant to acid corrosion. At the same time it has some features of a light-weight radiator. It is more suitable for use in an independent heating system compared with an aluminum radiator. Copper-aluminum composite radiators use relatively scarce copper materials, and radiators are expensive.
2) The shape is relatively simple, and the shape cannot be made into various artistic shapes like the aluminum radiator; it mainly depends on convection heat dissipation. When the water temperature is higher, the heat dissipation performance can be better exerted.
EOLO STAR 24 3C is a tube-in-tube heat exchanger that produces hot water quickly but is not stable enough.
The EOLO MINI 24 3C is a plate exchanger. The water is more stable and does not turn cold and hot.
The second is the rated thermal output power of the EOLO STAR is 23.8KW, and the thermal output power of the MINI EOLO is 24KW.
2. Why is the coil spacing 17.5cm?
17.5 is the national standard, that is, the room temperature reaches the basic temperature (20°) you need. The coil spacing is 17.5cm. If you want a higher temperature, you can narrow the coil spacing, but the corresponding cost will increase.
3. The number of thermostat rules: a guest restaurant, kitchen and bathroom generally do not put, one each other.
4. One set of water 2 sets of end fittings, one water separator for two basic interfaces, one water separator for one solenoid valve.
5. The distance between the boiler and the ground is 2 meters.
6. Ima's thermal energy consumption is 95%, domestic thermal energy consumption is about 88%.
7. What kind of heat sink material is good?
a. Steel Radiator (Kaimei Steel Plate Radiator, Nuoro Tianjiao Series)
1) High metal strength, strong pressure resistance, beautiful appearance and neat appearance, easy installation and maintenance, fast heat dissipation, low water temperature can also dissipate heat as usual, and it is easy to realize mechanized production.
2) Steel cooling requires long service life in an independent heating system, and corrosion resistance does not deteriorate. To add well water or tap water when heating is used, it is best to quickly deoxidize the water in the entire system. The deoxidized water will not cause oxidation to the radiator system, and only need to make up for the lack of water in the system. If enough water is available, never use any hot water in the system. If you continuously use the hot water inside the system and recharge the raw water, the oxygen contained in the newly added water will be fatal to the radiator and the entire system. Corrosion. After the heating is completed, use the original water to maintain the entire system. Many customers who do not know how to remove oxygen will enter the heating system and cause oxidation corrosion. This system will leak quickly and cannot be used within a few years. Independent heating radiators are best choices for low carbon steel radiators, and the best internal anti-corrosion radiators (not the best number of anti-corrosion, this is a misunderstanding, the best anti-corrosion is the longest life It is 10 to 9 years, and it is done according to working procedures to achieve the best results, but the cost will increase a lot. The anti-corrosion will be too thick and the inner wall of the radiator will fall off. The main reason is that the radiator cannot be synchronically increased and contracted. Like paint, a thick brush will burst a single point.) But good carbon steel radiators can be protected from corrosion inside or inside the heating system, if the central heating steel radiator is used for antisepsis and not for antisepsis There is no great influence. If the anti-corrosion is not good, it will also cause fatal damage to the radiator. We can see that the interior of the central heating pipe is not preserved. When you cut the original iron pipe, you will find that there is a cluster of black mucous on the inner wall of the pipe. There is no rust and corrosion. The main heating water is deoxidation and softening. However, manufacturers are now doing anti-corrosion.
b. Aluminum Radiator 1) With the advantages of high thermal efficiency, rapid heating, beautiful appearance, energy saving and material saving, etc., along with people's requirements for radiator decoration, controllability, economy, etc., rapid development has been achieved in recent years.
2) In the European countries such as Italy and Spain, which are mainly independent heating of low-temperature hot water radiators, aluminum radiators account for most of the market share with their elegant artistic taste and excellent performance.
3) The main drawback is the fear of alkali corrosion. However, for the independent heating system, the system water is neutral to weakly acidic, and its impact is severe. Mainly aging is short and short-lived. The higher the water temperature, the faster the aging.
c. Copper-aluminum composite radiator 1) The copper pipe is a water-passing part, which is a radiator with Chinese characteristics. The biggest advantage is that it is resistant to acid corrosion. It also has some characteristics of a light radiator and is more suitable for use in an independent heating system. Compared with aluminum radiators, copper-aluminum composite radiators use relatively scarce copper materials, and radiators are expensive.
2) The shape is relatively simple, and the shape cannot be made into various artistic shapes like the aluminum radiator; it mainly depends on convection heat dissipation. When the water temperature is higher, the heat dissipation performance can be better exerted.
8. How is the Polyline PE-XB floor heating pipe?
â—Ž The German Poly pipeline is a PE-Xb pipeline and is a silane-crosslinked polyethylene pipeline.
â—Ž is the world's leading plastic material.
â—Ž is a memory material. (In the connection process, special PE-XB pipe connection fittings can be used. No need to use silicone O-rings)
â—Ž It is a pipe with anti-permeation function.
â—Ž It is a pipeline that passes the authoritative certification WRAS certification and can be used for 85 degree hot water system.
â—Ž It is a plastic pipe with small creep and longest material life.
â—Ž The pipe connecting pipe is made of copper material. It is a pipe that does not need other materials to ensure that the connection will not leak water.
â—Ž It is a pipe with high temperature resistance, noise reduction, strong anti-aging and chemical resistance.
9. REHAU PE-XA floor heating pipe features?
German Reheater floor heating pipe, RARTITAN pink heating pipe made of high pressure cross-linked RAU-VPE (PE-Xa) is the core component of all floor heating installation systems. It is not only resistant to high pressure, but also strong and durable. Because the outer surface of the pipe is coated with a protective layer composed of polyvinyl alcohol (PAU-EVAL), the pipe has anti-oxygen permeability. Another advantage of REHAU floor heating pipes is the long-lasting and leak-free tightening of the collar connection system. According to the DIN 18380 standard, this quick and easy connection can be embedded in cement, concrete, and plaster. The strength and final condition of each connection point can be easily checked visually. The PAUTITAN pink heating pipes can be connected to reduce the waste of the pipes.
10. Application and Features of PERT PEX in Floor Heating
PE-X: Domestic production generally adopts medium density polyethylene or high density polyethylene and silane crosslinking or peroxide crosslinking method. It is the chemical bond between the linear long molecular chains of polyethylene, forming a three-dimensional network molecular chain structure. Compared to general polyethylene, tensile strength, heat resistance, aging resistance, stress crack resistance, and dimensional stability are improved. The entire production process is a chemical reaction process. The floor heating type has difficulties in that the cross-linking agent is not easily dispersed uniformly, the cross-linking degree is difficult to control and the screw needs to be periodically cleaned to prevent the generation of gel particles, and the quality control of the product is difficult, and it is difficult for a general small-scale production enterprise to do well. The qualified PE-X pipe has the advantages of good mechanical properties, high temperature resistance and low temperature performance. However, PE-X pipes have no thermoplastic properties and cannot be joined and repaired by hot melt welding.
PP-B: Good low temperature resistance, high flexural modulus, excellent connection performance, and low raw material costs. But in the floor heating system design pressure of 0.6MPa need to use S3.2 series of pipe (PE-X, PP-R, PB and PE-RT, etc. need to select S5), de20 pipe wall thickness of 2.8mm, relative diameter Reduced 1.6mm in PE-X, PP-R, PB and PE-RT varieties. Heat resistance is poor compared to other products. Raw material manufacturers have not yet made creep failure curves.
PP-R: good high temperature resistance, good mechanical properties and excellent connection performance. In Europe, there are several companies that have a qualified creep failure curve. However, the low temperature impact resistance is poor.
PB: Excellent creep resistance and mechanical properties, and the softest of several floor heating pipes, the thinnest wall thickness is designed and calculated at the same design pressure. Under the same conditions of use, the same wall thickness series of pipe, the use of the highest safety of the species. However, the raw material price is the highest, which is more than double that of other varieties. Currently, there is less area for application in China.
PE-RT: The floor heating material is a medium-density polyethylene with very stable mechanical properties, which is formed by metallocene catalyzed copolymerization of ethylene and octene monomers. Its unique ethylene main chain and octene short-branched structure make it have ethylene superior toughness, stress crack resistance, low temperature impact resistance, outstanding long-term hydrostatic pressure resistance and octene heat-resistant creep performance. It can be connected by hot melt connection. It can be damaged accidentally or it can be repaired by hot melt connection. The floor heating raw material has a creep failure curve that meets the product standard, and is the only one that can be used for the hot water pipe in the polyethylene at the present stage without cross-linking. However, its processing range is narrow and quality control is difficult.
11. The effect of different specifications of the floor heating pipe on floor heating 1. From the perspective of HVAC design: 1. The difference in the amount of heat dissipation Under normal circumstances, the temperature of the supply and return water is 55~45°C, and the indoor temperature is 20°C. The floor material is made of wood floor and the pipe spacing is At 200mm, the heat dissipation of PEX tubes of dn16 and dn20 is 90.2 w/m2 and 112.7 w/m2, respectively. The heat dissipation of dn20 tube is about 20% larger than that of dn16 tube under the same conditions. (The data is selected from the “Technical Specification for Terrestrial Radiant Heating.†At present, the energy efficiency standard for residential buildings in China is not more than 52 w/m2 on average, and Beijing Municipality provides an average of no more than 32 w/m2. From the above data, it can be seen that the heat dissipation of the pipes of dn16 The amount has fully met the heat load requirements. 2. The difference in flow resistance is based on a single loop flow rate of 130kg/h, dn16 pipe resistance loss is 164Pa/m, dn20 pipe resistance loss is 50Pa/m, and 100m length calculation resistance is 16400Pa and 5000Pa respectively (without partial resistance With the water collector resistance). Floor heating resistance requirements should be within 30kPa, both under normal circumstances will not exceed. However, under actual conditions, due to the pump selection and other issues (see below), the dn20 pipe will work under the condition of large flow and small temperature difference, that is, the actual transmission loss is not much different. Moreover, under the condition of separate heating, the terminal resistance is not necessarily as small as possible. Appropriately increasing the terminal resistance can well overcome the phenomenon of hydraulic imbalance in the system, and it is also easy for the components of the small system to balance between the water collectors. For the heating system of the heating system, the head of the indoor system is usually set at 30kPa. 3. The flow rate in the pipe is 130kg/h above the single loop flow rate, 0.33m/s in the dn16 pipe, and 0.2m/s in the dn20 pipe. According to the “Technical Specification for Radiant Floor Heatingâ€, the flow rate in the floor heating pipe must not be low. At 0.25m/s, in this case, the actual working condition of the dn20 pipe should be to increase the flow and reduce the temperature difference operation. 4. In actual engineering applications, the pipes of dn16 in cold regions such as Harbin and Xinjiang also fully satisfy the heating effect. Only in a few cases where the parameters are limited, such as excessive load, excessively low head pressure, etc., it is technically required to use dn20 tubes. Second, the pressure capacity of the pipe for the same kind of pipe under the same wall thickness, the smaller pipe diameter bearing capacity than the larger diameter. Because: Different types of pipe thermal strength test based on ring stress, the same pipe under the same test conditions, the same test ring stress, but the actual pressure of the pipe is different. The relationship is as follows: P = 2 бе / D ее P: Test pressure (Mpa) б: Ring stress (Mpa) е: Tube wall thickness (MM) D: Tube outer diameter (MM) The above formula shows that the same kind of pipe is different The pressure of the size is different. Taking floor heating condition classifying four as an example, its allowable use of ring stress σ is 4.0 MPa, calculated according to the above formula, dn16 pipe: P = 2 бе / D е е = 1.14 MPa dn20 pipe: P = 2 бе / D ? е=0.89MPa III. Construction 1. Effect on the thickness of the cushion: The “Technical Specification for Radiant Heating of the Ground†stipulates that the thickness of the cushion on the pipe must not be less than 3cm, ie, the thickness of the dn20 pipe cushion is theoretically thicker than that of the dn16 pipe. 4mm. At the same time, with the increase of the pipe diameter, the possibility of cracking of the cushion along the pipe wall is also increased. 2, the surface temperature uniformity: In order to ensure the match of heat, under the same circumstances, with dn20 tube spacing greater, the greater the spacing, the more uneven surface temperature.
12. What kind of heat sink material is better?
1, cast iron radiator
1) Simple structure, good corrosion resistance, long service life, low price, stable performance;
2) The water capacity is large, the thermal inertia is large, and the temperature rise is slow, which cannot meet the requirements of the corresponding rapid speed of the independent heating system;
3) Cast iron radiators often have energy and pig iron consumption in the production process, and the environmental pollution is quite serious.
4) Casting sand in the inner cavity of the cast iron radiator will often have an adverse effect on the life of the fireplace and the operation of the control instrument. Therefore, cast iron radiators are not suitable for use in independent heating systems. A long time the appearance of rusty, gaskets generally seepage.
2, steel radiator
1) High metal strength, strong pressure resistance, beautiful appearance and neat appearance, easy installation and maintenance, fast heat dissipation, low water temperature can also dissipate heat as usual, and it is easy to realize mechanized production.
2) Steel cooling requires long service life in an independent heating system. Corrosion resistance is not ageing. To add well water or tap water when heating is used, it is best to quickly deoxidize the water in the entire system. The deoxidized water will not cause oxidation to the radiator system, and only need to make up for the lack of water in the system. If enough water is available, never use any hot water in the system. If you continuously use the hot water inside the system and recharge the raw water, the oxygen contained in the newly added water will be fatal to the radiator and the entire system. Corrosion. After the heating is completed, use the original water to maintain the entire system. Many customers who do not know how to remove oxygen will enter the heating system and cause oxidation corrosion. This system will leak quickly and cannot be used within a few years. Independent heating radiators are best choices for low carbon steel radiators, and the best internal anti-corrosion radiators (not the best number of anti-corrosion, this is a misunderstanding, the best anti-corrosion is the longest life It is 10 to 9 years, and it is done according to working procedures to achieve the best results, but the cost will increase a lot. The anti-corrosion will be too thick and the inner wall of the radiator will fall off. The main reason is that the radiator cannot be synchronically increased and contracted. Like paint, a thick brush will burst a single point.) But good carbon steel radiators can be protected from corrosion inside or inside the heating system, if the central heating steel radiator is used for antisepsis and not for antisepsis There is no great influence. If the anti-corrosion is not good, it will also cause fatal damage to the radiator. We can see that the interior of the central heating pipe is not preserved. When you cut the original iron pipe, you will find that there is a cluster of black mucous on the inner wall of the pipe. There is no rust and corrosion. The main heating water is deoxidation and softening. However, manufacturers are now doing anti-corrosion.
3 aluminum radiator
1) With the advantages of high thermal efficiency, rapid heating, beautiful appearance, energy saving and material saving, etc., along with people's requirements for radiator decoration, controllability, economy, etc., rapid development has been achieved in recent years.
2) In the European countries such as Italy and Spain, which are mainly independent heating of low-temperature hot water radiators, aluminum radiators account for most of the market share with their elegant artistic taste and excellent performance.
3) The main drawback is the fear of alkali corrosion. However, for the independent heating system, the system water is neutral to weakly acidic, and its impact is severe. Mainly aging is short and short-lived. The higher the water temperature, the faster the aging.
3, copper and aluminum composite radiator
1) The copper pipe is a water-passing part, which is a radiator with Chinese characteristics. The biggest advantage is that it is resistant to acid corrosion. At the same time it has some features of a light-weight radiator. It is more suitable for use in an independent heating system compared with an aluminum radiator. Copper-aluminum composite radiators use relatively scarce copper materials, and radiators are expensive.
2) The shape is relatively simple, and the shape cannot be made into various artistic shapes like the aluminum radiator; it mainly depends on convection heat dissipation. When the water temperature is higher, the heat dissipation performance can be better exerted.
You can quickly shake a variety of fruit, fruit juice, soy milk, milkshake, rice cereal. Coupled with four leaves of stainless steel blade, stirring hard objects is easy
- Safety: with it, you have no need to use the kitchen knife. Just press the button and the food can be chopped in several seconds
- Sufficient: 1.2L large capacity is perfect for 2 to 3 person, suitable for home use
- Clean: made of high-quality stainless steel material, it is easy to clean. You just need to rinse it with water and wipe it with a towel
- Multipurpose: it can mince many foods, including vegetables, fruits, and meat. You can use it to make turkey stuffing, salad, sauce, baby food and so on
- Quick: the 4 stainless steel blades are sharpened, powerful and solid, they can mince different foods in a very short time, save your cutting time
Informations of 3L Food Choppers
300W/350W
S/S,plastic housing
Stainless steel bowl or glass bowl with 6pcs blades
2 speeds withfuse with safety switch
With anti-slip ring
High quality metal gear extense lifetime of the machine
Quality guaranteed. CE GS CB ROHS Certifications are avaliable.
Molding polyfoam packing for safer delivery.
Hot-selling for all countries around the world.
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Flying Electronic Co., Ltd , https://www.electronicjmflying.com