When the air source heat pump is working, it consumes electric energy to drive the compressor to do work (this part of the electric energy is eventually converted into heat energy), and then absorbs a large amount of heat energy from the external ambient temperature, and passes through the refrigerant circulation system in the condenser. Exothermic is performed. It is precisely because of the existence of the "law of conservation of energy" that the electric energy input to the compressor can always be converted into a heat energy, and a large amount of heat energy absorbed from the external environment becomes an additional gain. That is to say, the main force that really heats the water is not the input electricity, but the free "heat" in the air.
The initial air energy heat pump had many problems, such as too noisy operation, too large unit volume, low heating efficiency at low temperature, which really affected the performance of the product, and many manufacturers also All began to tackle this problem, such as the "EVI" program.
Strictly speaking, the so-called "EVI" technology is based on a complete system, which consists of special components such as jet enthalpy compressor, hot water heat exchanger, and evaporator. But what plays a central role in it is the compressor, so what is a jet enthalpy compressor? This kind of compressor adds an extra steam injection port. The compressor receives the energy from the evaporator from the suction port, and receives the supplementary steam from the other end of the pipeline from the steam injection port. refrigerant (refrigerant). The essential meaning of this is to use the entry of steam to divide the original one-stage compression process into a quasi-two-stage compression process.
To illustrate more clearly, we can analyze this process step by step:
The first step: the compressor receives the heat absorbed by the evaporator from the air and compresses it;
Step 2: Open the EVI air supply circuit, and the steam is passed into the compressor;
Step 3: The part of the energy being compressed by the compressor is mixed with the incoming steam. This process will continue until the working chamber of the compressor is separated from the air supply port. At this time, the steam is fully mixed with the energy and becomes a new stream of energy;
Step 4: After the working chamber of the compressor is separated from the air supply port, the energy is compressed in two stages, and finally the energy enters the condenser and exchanges heat with water.
The gases are produced by a flasher within an air-to-energy heat pump. The flasher is connected to the compressor with a pipeline, and the steam is passed along the pipeline from the flasher to the compressor. Whether to supplement the gas and when to supplement the gas is controlled by the opening and closing of the solenoid valve. Because the flasher is actually located in the middle of the loop from the condenser to the evaporator.
When the flash evaporator supplies air to the compressor, it actually increases the subcooling degree of the liquid refrigerant before throttling, so that the liquid refrigerant can better absorb the energy in the air in the evaporator. It is equivalent to indirectly increasing the energy A provided by the evaporator to the compressor. In addition, since the compressor is supplemented with air, the amount of exhaust gas to the condenser also increases, which increases the amount of refrigerant that exchanges heat with water in the condenser. It is these two factors that make the "EVI" scheme improve the heating capacity of the unit in a low temperature environment.
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