Study On Operation Characteristics Of Heat Source Tower Heat Pump System In Hot Summer And Cold Winter Areas

As a new type of air-conditioning energy-saving technology,heat source tower heat pump technology has come to the forefront with various problems such as energy shortage,excessive building energy consumption and environmental pollution.This technology has attracted the attention of the research scholars in the HVAC industry.At present,the heat source tower heat pump system has been widely used in many buildings in china.The theoretical and experimental research on the heat source tower heat pump has certain results.This paper focuses on the combination of experimental test and numerical simulation to explore the operating characteristics of heat source tower heat pump under different working conditions and the applicability of heat source tower heat pump system in hot summer and cold winter regions.The first part of this paper briefly describes the principle,research status and related theories of heat source tower heat pump system.Through the test research of a heat source tower heat pump system in Zhenjiang Science and Technology Pioneer Park,the operating characteristics of the heat source tower heat pump system under different outdoor air temperature,different air flow,different solution flow rates and different gas-liquid ratio conditions are analyzed.The results show that the heat absorption of the heat source tower and the COP of the unit increase with the increase of the outdoor air temperature;the increase of the air flow rate increases the heat absorption of the heat source tower but the growth rate slows down;the heat absorption of the heat source tower follows The flow rate of the solution increases continuously but the rate of increase decreases.As the gas-liquid ratio increases,the heat and COP values of the unit increase first and then decrease.When the ratio is 1.18,the heat and COP values of the unit reach the highest value.The heat exchange effect is the best.The second part is the numerical simulation.The FLUENT simulation software is used to analyze the operating characteristics of the heat source tower under different conditions.The model conditions are consistent with the test conditions.The pressure,air density,velocity and airflow temperature in the heat source tower are the same.Analysis with the trajectory of the droplets,and the like.The simulation results show that there is a certain difference between the effluent water temperature of the heat source tower and the effluent water temperature of the heat source tower obtained by the actual test.Under the condition that the inlet flow rate of the solution is constant,the water temperature of the heat source tower increases with the increase of the air flow rate.Under the premise that the inlet air flow rate is constant,the effluent water temperature of the heat source tower increases first after the flow rate of the solution increases.There is a decreasing trend.These rules are consistent with the test results,which effectively demonstrates that the test data has certain reliability and can provide guidance and data support for the actual engineering application of the heat source tower.Finally,the economics of heat source tower heat pump air conditioning system and common chiller plus boiler air conditioning system and air source heat pump air conditioning system are compared in the initial investment of air conditioning system,minimum annual cost and life cycle cost,the heat source tower heat pump air conditioning system have a maximum initial investment of 7.1 million yuan and an annual cost of 936,200 yuan.From the life cycle cost analysis,the heat source tower heat pump air-conditioning system has a high life cycle cost than the other two air-conditioning systems.