| Currently, the heating load in the cold winter in north China is big and the time for heating supply is long. So the heating energy consumption accounted for the proportion of energy consumption is big. The heat pump is a kind of high-efficiency and energy-saving technology, but a heat pump of single heat source exists disadvantages that cannot be ignored. The composite heat pump of two or more kinds of heat sources is becoming a hot spot of current research. Solar and seawater are combined the solar assisted seawater-source heat pump system for heating supply, which can plays their respective advantages and makes up the defects of solar discontinuity and instability, and efficiency of the seawater-source heat pump reducing after a period of running time in winter. This text simulates researches the heating conditions of the combined heating system in winter.Based on a Dalian seawater-source heat pump system, the main equipment for solar system calculation is selected and designed. The mode of combined heating and operation control strategy is determined. The system mathematical simulation model is established using TRNSYS software. The seawater-source heat pump system for experimental verification ensures the correctness of the mathematical model based on the software.Firstly, the system is simulated the running status in consecutive six days in January. Through the study of relationship between water temperature out from the heat storage tank, evaporator’s inlet temperature and the heat capacity of the heat pump, heat pump system COP value, the solar systems and water source heat pump system under the operation condition of coupling is analyzized and the system running parameters and solar fraction is calculated for the conclusion of that solar system’s influence on the heating load.Secondly, the system of solar energy is optimized by changing the collector area and the tank volume and different matching schemes is obtained. The different scheme of system is simulated and the optimal scheme of system operating condition through comparison of the solar assurance, COP of the heat pump and the system COP value.Finally, the text analyzes and energy-saving benefit and technical economy of the systems. The system before compares with the seawater-source heat pump for energy saving ratio to the traditional coal-fired boiler plant. The different optimal schemes of system compare with the seawater-source heat pump for energy saving ratio to the traditional coal-fired boiler plant, then the plan with maximum energy saving is obtained. Years cost method are used in economic evaluation of the different optimal schemes of system and the seawater-source heat pump. Combined with the energy saving and cost value calculation, the comprehensive benefits are calculated and the scheme whose economic benefit is the best is optimal. The results show that the second scheme is optimal. |
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