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Technical Analysis of Quasi-Secondary Compressed Air Source Heat Pump Water Heater Zhang Yong, Yang Xue, Wu Changshun (Zhuhai Gree Electric Co., Ltd., Zhuhai, 519070) Air source heat pump hot water system for quasi-secondary compression of conventional and subcooler Brief performance analysis was carried out. Through the actual test of the variation of various performance parameters with the inlet water temperature under different working conditions, the optimal gas pressure of the sub-secondary compressed air source heat pump water heater was found. The results show that compared with the conventional air source heat pump hot water system, the quasi-secondary compressed air source heat pump hot water system of the subcooler can significantly improve the heating capacity and performance coefficient, reduce the exhaust temperature, widen the operating range, and can be a subcooler. The quasi-secondary compression heat pump system is designed for the design and application of air source heat pump water heaters.
Air source heat pump; quasi-secondary compression; intermediate air supply; economizer; hot water machine rumors along with the rapid development of the global economy, the global harsh climate environment problems caused by industrial production and energy consumption, such as the greenhouse effect Acid rain, air pollution, etc., have forced the exploration of efficient and clean energy fields to an unprecedented height, and people's attention and requirements for living environment and cold and heat comfort are also increasing.
As a new type of hot water product, air source heat pump water heater has been gradually favored by people because of its unique advantages of energy saving, environmental protection, health and sustainable supply of domestic hot water, and meeting the needs of people and national policy development in the new era. .
However, the traditional air source heat pump water heater is applied to the cold regions of the Yangtze River Basin and North China, such as severe heat attenuation, high compression ratio, high exhaust gas temperature, low coefficient of performance cop value, etc., greatly inhibiting the usability 12 In response to such situations, the relevant refrigeration researchers have proposed the most cost-effective technical solution, namely the quasi-secondary compression heat pump system with economizer, and the economizer is divided into two types: flasher and subcooler. For the conventional air source heat pump hot water system and lgp-h diagram, the quasi-secondary compressed air source heat pump hot water system and the lgp-h diagram are shown. Both systems use the same compressor - a scroll compressor with intermediate air supply, in which the conventional air source heat pump water heater does not use the air inlet. The main technical parameters of the compressor: refrigerant R22, rated heating capacity 20.24kW, rated power / r, rated speed 2900r / min, rated current 8.5A. The main throttle valve of the conventional hot water system uses electronic expansion valve; The main throttle valve of the compressed hot water system uses a thermal expansion valve and is only adjusted according to static superheat.
It can be seen from the above two systems that compared with the conventional air source heat pump hot water system, the quasi-secondary compressed hot water system adds a supplemental air branch, and after the refrigerant is condensed, it is divided into two paths, and the main road is a conventional heat pump circuit. The auxiliary road forms a gas-liquid mixed state of intermediate pressure after throttling. At the same time, the two channels enter the subcooler for heat exchange. After the main refrigerant is overcooled, it is throttled by the expansion valve and then enters the evaporator to absorb heat. The auxiliary refrigerant forms steam into the compressor air inlet through heat exchange. A part of the intermediate pressure gas is sucked through the intermediate pressure suction port, and is mixed with the partially compressed refrigerant to be compressed, thereby achieving quasi-two-stage compression by a single compressor, increasing the refrigerant flow rate in the condenser, and increasing the main circulation. The enthalpy of the circuit greatly increases the efficiency and reliability of the compressor.
1.2 The test content is a comprehensive analysis of the application of quasi-secondary compression of the subcooler in the air source heat pump water heater, and the standard working conditions, minimum operation and low temperature conditions of the air source heat pump water heater under different inlet water temperatures. Conduct a comparative test.
The main test data includes heat, power, COP, exhaust temperature, supplemental pressure, exhaust pressure, and evaporation pressure.
2 Theoretical analysis 2.1 Theoretical analysis of conventional air source heat pump hot water system The main performance indicators: Chai Xihu, Ma Guoyuan. Current Status of Research on Low Temperature Adaptability of Air Source Heat Pumps Yu Lihua, Ma Guoyuan, Xu Rongbao. The status quo of low temperature air source heat pump and Ma Guoyuan, Yan Qisen. Experimental Research on the Economizer System of Scroll Compressor Tan Xi, Shu Shuiming, Ding Guozhong, et al. Research on heat pump cycle performance with intermediate-filled scroll compressor. Refrigeration and air conditioning. 2010
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