High temperature heat pump technology explanation and application field

High temperature heat pump heating water temperature can reach 80 ℃ over the heat pump.The limitation of air source heat pump hot water output from all closed compressor and refrigeration oil loss lubricity, freon coking and motor insulation damage, etc.On the market at present is most of the air source heat pump using R22 as a working medium as well as the general condition of the compressor.

As working medium of thermodynamic properties and chemical properties and general condition of R22 compressor's adaptability, it is hard to out of the water temperature up to 55 ℃ or more.This is because the normal working condition of the compressor can withstand the highest evaporation temperature to the director of the 12 it (if the evaporator inlet is 20 ℃ the evaporator outlet for 16 ℃, then according to the degree of superheat 4 considering the evaporation temperature of 12 ℃, the limit of the allowed by compressor), the largest compressor under pressure 24 kg, RR2 condensing pressure is reached at 60 ℃ condensing temperatures 24 kg.So this kind of heat pump work scope: evaporator water less than 20 ℃, condenser water not more than 55 ℃.

For high temperature heat pump cycle working medium, compressor, system form, heat exchanger optimum design, lubricating oil system and no non-condensable gas treatment has obvious particularity.To its application and research must be to choose the suitable working medium, and then is suitable for the design of the compressor and satisfy the working medium work unit and intelligent control system, etc.

Japan in the 1980 year was carried out by the heat pump project, 4 kinds of heat pump developed, including the use of more than 45 ℃ hot water, in the hot water temperature of 85 ℃ high temperature heat pump, and the use of more than 80 ℃ hot water and output 150 ℃ high temperature heat pump of steam.Europe is by improving the performance of centrifugal compressor technology route of high temperature heat pump, using everything refrigerants, triple eccentric compression mode, heating water temperature can reach 85 ℃.

The emergence of high temperature heat pump, greatly expand the application field of heat pump, can be directly recycled more than 20 ℃ ~ 55 ℃ low grade (waste heat) resources, make 65 ℃ ~ 90 ℃ hot water, and used for heating, heating oil, industrial insulation, production with hot areas such as alternative fuel, gas, coal-fired boiler, can save a lot of primary energy, has the very good energy saving and environmental benefits of high temperature heat pump especially in the aspect of industrial heat, steam boiler, waste heat recycling, building heating, high temperature baking food and other industrial products of high temperature baking, etc. Above 80 ℃, the basic reach the design standard of the heating in the north, so the high temperature heat pump can be used as common building heating of the heat source and heat source.

Low Temperature Air Source Heat Pump Working Principle and Characteristics(1)

1. The working principle of low temperature air source heat pump

Air source heat pump units by the evaporator, condenser, compressor and expansion valve four main parts form a closed system, which filled with the right amount of working medium.Unit operation principle is based on inverse circulation principle: liquid working substance in the first place in the evaporator absorbs heat from the air and steam evaporation formed (evaporation), latent heat of vaporization is reclaimed by heat, and then by the compressor compressed into high temperature and high pressure gas, into the condenser condensed liquid (liquid) need to absorb heat heating water, liquid working substance after decompressional expansion of the expansion valve back on expansion valve, absorbing heat evaporation and complete a cycle, so on, constantly absorbing the low temperature water source of heat and heat output, directly to the expected temperature. 

2. The characteristics of low temperature air source heat pump

A.  Safety 

Because it is not used directly heated by electric heating element, the relative electric water heater, to eliminate the leakage of the security hidden danger;Relative gas water heater, no gas leak, or safety concerns, such as carbon monoxide poisoning, thus has more excellent safety performance.

B. Comfortable 

Air source heat pump is regenerative, function according to the temperature of the tank heating or air conditioning load start automatically, to ensure adequate supply 24 hours hot water, air-conditioning loads, heating hot water won't appear like a gas water heater can't satisfy the multiple problems with hot water faucet, at the same time also won't appear electric water heater capacity is small, many people take a shower to wait.Out-of-the-box hot water, large water yield, water temperature stability, meet all your expectations of hot water. 

   TO BE CONTINUED

Air Source Heat Pump (Heating Floor ) Matters Needing Attention

when you use air source heat pump,some questions you should attention.

 1. High temperature can not directly on the ground, such as using electric stove, coal stove on the ground. Because of the ground temperature will damage the pipe under the ground.

 

2. Unable to drilling, nailing on the ground, so as not to break through the ground under the pipeline does need to drilling, please contact the installer or contrast of floor heating floor heating tube distribution diagram, confirm will not damage the floor heating pipe, so the damage caused by yourself.
 

3. The fixed garnish is not installed on the ground as far as possible or put the furniture that has no legs, lest affect ground heat dissipation, usually need to more than 125 px furniture floor above the ground.
 

4. Do not placed directly on the ground during the heating of water glass and porcelain, in order to avoid uneven heating lead to rupture.

 
 

5. On the ground may not be placed above 2 t / ㎡ items, in order to prevent the deformation of the ground rupture, really need reinforcement measures should be taken to (enlarge the contact area, to reduce the pressure).
 

6. 0 ℃ in winter, pays attention to the following antifreeze, temporary unused area of the water system is completely shut down, if you want to close the need to set aside the small opening to prevent freezing.
 

7. In the heating period filled with water service (conditional word reference implementation, because involves water quality problems, within a year may require multiple filling water, waterproof).