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Air to water heat pump tips


Heat pump technology is based on the reverse Carnot cycle principle. It is mainly composed of four parts: compressor, condenser, expansion valve and evaporator. The working process is as follows. In this way, the air-energy water heater can continuously absorb the heat in the air and transfer this heat to the water side, thereby heating the hot water. the goal of.

Advantages of air source heat pump water heater

Safe and reliable

The air source heat pump water heater realizes the complete separation of water and electricity. It does not have the safety problems such as electric shock, flammability, explosion, and poisoning that exist in the use of electric water heaters and gas water heaters. It is a relatively safe and reliable hot water supply equipment today.

Energy efficient

Heat pump water heaters only consume a small amount of electricity and can absorb a large amount of heat in the air.

But the energy consumption is only 1/4 of traditional electric water heaters, 1/3 of gas water heaters and 1/2 of electric heating solar water heaters.

Air source heat pump classification

1. Classification by heat source

Air source heat pump: A device that uses air as a low-level heat source and absorbs heat from it to a high-level heat source.

Water source heat pump: A device that uses water as a low-level heat source to absorb heat from it to a high-level heat source.

Ground source heat pump: A device that uses underground pipes or groundwater as a low-level heat source to absorb heat from it to a high-level heat source.

Swimming pool unit: a heat pump unit specially designed to heat the swimming pool at a constant temperature. The general constant temperature is 28°C. The water heat exchanger of this unit is made of titanium tubes

Air-conditioning heat pump: It can cool, heat, and produce domestic hot water devices (triple generation).

Hot and cold water unit: A device that can produce cold water and hot water separately or simultaneously.

Air source-water source heat pump: A device that can absorb heat from air and water alone or simultaneously from air and water to a high-level heat source

2. Classification according to heating temperature: high temperature heat pump (above 65); low temperature heat pump (below 60).

3. Classification by heating method

Direct heating type: heats cold water to the set temperature in one go.

Circulation type: multiple cycles to heat the cold water to the set temperature.

Immersion type: Place the heat exchange tube directly in the insulated water tank, and heat the cold water to the set temperature

4. Divided according to the field of use: household type and commercial type. It is generally considered that machines below 3P are household type, and above are commercial type.

5. According to structure: split type and integrated type. The main thing is to see whether the water tank and the main unit are combined. The all-in-one machine seems to be smaller in size and more beautiful in appearance, but due to size limitations, its capacity is not large and its efficiency is relatively low.

6. According to the working temperature: ordinary type, low temperature type. The general working temperature range of the ordinary type: -5-43, and the general working temperature range of the basic low temperature type: -15-40.

7. According to working voltage: single-phase 220V, three-phase 380V

8. According to the air outlet type of the machine: top air outlet and side () outlet.

9. According to the refrigerant heating method: inner coil, outer coil,

Air source heat pump component functions


Air source heat pump water heaters generally use rotor compressors and scroll compressors. The household series uses rotor compressors, and the commercial series uses scroll compressors.


The evaporator of air source heat pump water heater basically adopts flat plate type

Water aluminum foil.


Spiral sleeve heat exchanger

Plate heat exchanger

Shell and tube heat exchanger

Immersed coil condenser

Swimming pool titanium tube heat exchanger

Throttle component:

Throttle and reduce the pressure of the high-temperature and high-pressure refrigerant liquid coming out of the condenser into a low-temperature and low-pressure liquid, and then discharge it into the evaporator. Capillary tube, thermal expansion valve, electronic expansion valve.

Other refrigeration system components:

Four-way valve: enables the refrigeration system to operate freely in both cooling and heating modes.


Fan component: accelerates air blowing from the outside across the evaporator surface to improve the heat transfer efficiency and heat dissipation performance of the evaporator.

Gas-liquid separator: Separates the excess refrigerant liquid and gas from the evaporator that has not been completed by the evaporator to ensure that the compressor sucks only gas.

Electrical control system: consists of circuit boards, transformers, control panels, signal lines, various temperature sensors, AC contactors, thermal overload protectors, terminal blocks, and lines.


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