Heat Pump

Working principle of heat pump

Heat pump hot water unit is mainly composed of four major components: evaporator, compressor, condenser and expansion valve. By allowing the work material to continuously complete the thermal cycle process of evaporation (absorbing heat from the environment) → compression → condensation (releasing heat) → throttling → evaporation again, thus transferring heat from the environment to water.

When the heat pump hot water unit works, the evaporator absorbs the heat energy from the environment, the compressor draws in the normal temperature and low pressure medium gas, compresses it into high temperature and high pressure gas through the compressor and conveys it into the condenser, the high temperature and high pressure gas releases heat in the condenser to make hot water and condenses into low temperature and high pressure liquid. After the expansion valve throttling into low temperature and low pressure liquid into the evaporator for evaporation, low temperature and low pressure liquid in the evaporator from the external environment to absorb heat after evaporation, into a low temperature and low pressure gas. The evaporated gas is sucked into the compressor again and starts another round of the same working process. Such a cycle process is continuous and repeated, so as to achieve the purpose of continuous heat production.

Schematic diagram of heat pump connection.

The schematic diagram of the heat pump principle is as follows.

When the heat pump works, the energy stored in the environmental medium QA is absorbed through the evaporator; the energy consumed by the heat pump itself doing work is partly converted into thermal energy QB; the heat released by the heat pump circulating mass in the condenser QC is equal to QA + QB, thus it can be seen that the energy output of the heat pump is the thermal energy generated by the unit doing work QB and the heat absorbed by the heat pump in the environment QA; therefore, a large amount of electricity can be saved by using the heat pump technology.

The principle of heat pump energy saving is shown in the following diagram.

Example: V-70 unit, heat pump system input power 6.59 kW, ambient temperature 20C, but the output heating power reaches 33.7kW, which means that the heat pump absorbs a lot of free heat energy from the surrounding environment when it works. In this process, the system consumes only 6.59 kW of electrical energy, which is equivalent to the work done by a conventional electric water heater with an input power of 33.7kW/0.95=35.5kW, with a system energy efficiency factor of 510%. (COP=heat production capacity/power input).

Heat pump water heating unit is an efficient, environmentally friendly, energy-saving heat pump product that uses the principle of heat pump technology to transport free energy – air heat energy to water in the working cycle of the heat pump system, so as to achieve the purpose of heating cold water to produce hot water. Its maximum thermal efficiency can reach 590%, and the annual average thermal efficiency can reach 480%.

In the production of low-temperature (below 60 degrees Celsius) heat, the traditional way of consuming electricity or chemical energy of fuel has gradually given way to the heat pump heat production method, because in this field, the heat pump system can easily exceed the traditional way of heat production efficiency by more than several times; therefore, the cost of making 60 degrees Celsius hot water is less than the solar-assisted electric heating system; 80% less electricity than electric boilers; 50% less energy consumption than oil boilers; the cost of making 60 degrees Celsius hot water is less than the solar-assisted electric heating system; 80% less electricity than electric boilers; 50% less energy consumption than oil boilers. 50% of energy consumption cost; the amount of water for heating can be adjusted automatically according to the demand. Adapt to the temperature range of -10~45℃ area.

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