Experimental test method for quasi-two-stage compressed air source heat pump water heater with supplementary air and increased enthalpy

Abstract

The invention discloses an experimental test method for an air-supplying and enthalpy-adding quasi-secondary compressed air source heat pump water heater. The method comprises the following steps of establishing a throttled enhanced vapor injection system before a flash evaporator, setting an engineering application hypothesis, establishing a test bench to test the Freon system, obtaining an actual working cycle pressure-enthalpy diagram of the quasi-secondary compression system, subjecting to thermodynamic analysis, testing the temperature and pressure of each state point according to the actual working cycle pressure-enthalpy diagram of the quasi-secondary compression system, calculating the state parameters of the state points, and substituting the state parameters of the respective state points into the heat generating process. The test method provided by the invention, by testing the compressor suction and exhaust temperatures, the temperature before and after the throttling of the electronic expansion valve, and the air-supplying temperature of the air-supplying and enthalpy-adding quasi-secondary compressed air source heat pump water heater system, uses experimental and computational methods to obtain the various state points of the system pressure-enthalpy diagram, can solve the COP value of the system, effectively reduce the cost input and solve the problem of unstabletest results due to temperature changes.

Description

technical field [0001] The invention relates to the technical field of water heater testing, in particular to an experimental testing method for a quasi-two-stage compressed air source heat pump water heater by supplementing air and increasing enthalpy. Background technique [0002] When the existing quasi-two-stage compression air supply and enthalpy-increasing working fluid system performs quasi-two-stage compression defrosting, the Copeland compressor is used. The air inlet of the Copeland compressor uses two air inlets. In order to improve the efficiency of the compressor, air should be replenished from time to time, but in the actual operation process, when the outside air temperature is low, the exhaust of the compressor is exhausted through the circulation system of the heat pump using the quasi-two-stage compression system, and the high temperature and high pressure at the outlet of the compressor The gas is divided into two parts, one part enters the evaporator afte...

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Problems solved by technology

[0003] The efficiency of air source heat pumps in winter can be improved by using the technology of supplementing air to increase enthalpy, but the test methods of experimental research are different. If it is necessary to conduct in-depth thermodynamic research on the quasi-two-stage compression of supplementing air to increase enthalpy, it is necessary to obtain the pressure enthalpy Each state point in the figure, in general, such as the pressure test of the air-injection enthalpy-enhancing air source heat pump, the test procedure and process are relatively complicated, and many testing institutions do not provide similar services. The temperature and pressure of the supplementary air will change accordingly, which will cause the disorder of the intake air mixing of the compressor, and there will be a big problem with the service life of the compressor. At the same time, the price of the Copeland compressor is much more expensive than that of the ordinary compressor, and the cost The investment is large and the economy is low. Therefore, the present invention proposes an experimental test method for a quasi-two-stage compressed air source heat pump water heater to solve the deficiencies in the prior art.

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