Electrified Improvement And Control Of The Solar-assisted Heat Pump Multi-function Machine

The Development and Utilization of solar energy application are the Material Base of existence and development for the mankind, it is important strategic meaning in our country or even internationally。Solar energy is the primary source of the Human Energy and a kind of pollution-free and plenty containing natural energy.Today, the problem of Energy and Circumstance has become the two important social problems waiting to happen, the using of solar energy is attached more and more importance to human. Connecting heat pump, solar energy equipment and heat accumulator, and offering hot water; like this, not only is energy economized on, but also do environmental pollution decrease. At present, the study on the system of solar heat pump multifunctional-machine (SAHPM) at the experimental stage basically, there is some gap with the internal level. In this contest, we carry out the research on the solar heat pump system.multifunctional test-bed and took a series of practical tests on heating in winter, refrigeration in summer and applying hot water all the year round.This task explored comprehensively characteristics of heat transmission and mass transfer of the system component parts, from the circulation mechanism and structural characteristics of the SAHPM system. For the compressor and Electronic Expansion Valve, the concentrated parameter method is used to establish their models. Due to complexity of heat transfer between the solar collector and evaporator, their models are established by distributed parameter method. Through computer numerical simulation and calculation, the internal rules and characteristics of various influence factors affecting the heating performance of research object are gained. It is pointed out that changing capacity of the compressor and opening of the electronic expansion valve are the basic control strategies to improve the system performance and obtain the best COP value in the condition of the fixed climate and structure parameters relatively.The main contents are realizing the elutriation of control of SAHPM. The principle of inverter compressor is controlling discharge amount per unit time by changing the speed of compressor, consequently, so that we achieve the purpose of opening of the electronic expansion valve and control of refrigeration capacity. The control principle and realization method of the electronic expansion valve regulating degree of superheat of the outdoor evaporator and the compressor capacity regulating condenser depression of the indoor condenser to satisfy indoor heating and hot water load are studied. Through the King View technology, we can monitor the whole system.