Basis Research On The System Performance Of Compound Energy Heat Pump System With Single And Double Compressor

Multi-source dual compressor heat pump system is the use of solar energy, geothermal energy and solar energy complex air as cold source heat pump system the system can give the user the winter to provide heat in the summer to provide cooling capacity, and can provide domestic hot water year round. This system does not exist and overheating in summer solar collectors, because excess summer solar heat accumulator in the soil up to prepare for winter use, particularly in the winter more heat load applied is greater than the cooling load in summer areas.Mainly through analysis and numerical simulation method to build models of single and double herein composite source heat pump system compressor refrigerant cycle in summer and heating in winter conditions were studied, using R134a as refrigerant compressor complex verification dual-source heat pump system energy savings benefits features.Through the summer and heating in winter conditions Mono composite source heat pump system compressor refrigerant cycle icon on the pressure-enthalpy diagram (ignoring supercooling and superheating degree), and the corresponding parameters calculated from the data shown parameter comparison of these two systems. In order to meet the energy trend of the development of modern society, will be replaced with environmentally friendly refrigerant R134a refrigerant R407c, and calculated contrast. Finally, the following conclusions can be drawn:(1) When the summer cooling using a particular refrigerant R134a, single, dual compressor composite source heat pump system refrigerant cycle condenser heat load, the power consumption of the compressor theory, comparison between theory shows that the cooling factor, with two compressors solar complex than a single compressor heat pump heat pump system in these three areas have a clear advantage; when water flows through the condenser and air-side side condenser mass flow ratio is not the same, we can see the condenser heat load, the power consumption of the compressor theory, theory these three aspects of refrigeration coefficient changes were linear change, the maximum value and optimal solution without intermediate; replacement refrigerant R407c, condenser heat load change of the compressor power consumption of theory, the theoretical coefficient of performance of these three parameters with cooling change agent R134a same trend, so complex dual compressor heat pump still has the advantage, and the condenser heat load and compressor power consumption are lower than the theoretical non-green refrigerants refrigerant R134a, refrigeration theory coefficients were higher than non-environmentally friendly refrigerants refrigeration agent R134a, R407c refrigerant therefore has environmental advantages.(2)When winter heating refrigerant R134a, solar heat pump system with two complex than a single compressor in the heat pump condenser heat load of the compressor for circulating a refrigerant compressor power consumption of theory, the theoretical system having three heating coefficient obvious advantages; when water flows through the condenser and air-side side condenser mass flow ratio is not the same, the condenser heat load, the power consumption of the compressor theory, theory of refrigeration coefficient of variation showed a linear change, without intermediate maximum and optimal solution; condenser heat load, compressor power consumption theory, the theoretical aspects of heating coefficient, environmental refrigerant R407c and R134a refrigerant contrast of contrast when using R134a and R407c, using the same kind of situation with the refrigerant system, does not have the environmental advantages; this in both cases the refrigerant, single compressor solar hybrid heat pump system in the condenser heat load, change the power consumption of the compressor theory of trends are decreasing trend.(3) In composite design model dual-source heat pump compressor refrigeration system under complex conditions than single compressor source with energy-saving advantages; under heating conditions, when the mass flow rate of refrigerant flowing through the air side of the low percentage of the total mass flow at80%, the two-source heat pump compressor complex situation in the cooling system has the advantages of energy-saving compressor complex than single source.(4) Determine solar-air-to be able to multi-source heat pump heating and air conditioning dual composite systems automation system parameters to be considered are mainly indoor temperature, outdoor temperature, instantaneous irradiance of the sun (in the medium temperature solar collectors), import and export of water underground heat exchanger, heat storage tank temperature and the ambient temperature of the pipeline and several other parameters.