Thermal Environment Simulation And Experimental Study Of Air Source Heat Pump Double-end System

In recent years,as a new type of terminal equipment,floor radiation has become more and more widely used in hot summer and cold winter areas due to its good comfort and energy saving,but its slow cooling rate limits to a certain extent Its development.In order to solve this problem,the operation mode of combined cooling with the fan coil unit can be adopted to realize the rapid cooling of the indoor air temperature.A small office building in Nanjing is took as the research object in this paper.The heat and cold source is an air source heat pump,and the end is a “floor radiation + fan-coil”combined cooling system.The research results show that: “floor radiation + fan-coil” at a water supply temperature of 17 ? The average indoor temperature when the combined cooling coil system reaches a steady state is 25.5?,and the indoor air temperature in a steady state reaches Class I thermal comfort without condensation.Compared with the floor radiation single cooling system and the fan coil single cooling system,the “floor radiation +fan-coil” combined cooling system can not only cool down quickly,but also has a stronger cold storage capacity after the unit is turned off.Based on the experiment,Airpak is used to simulate and analyze the indoor thermal environment of the “floor radiation + fan-coil” combined cooling system in this article.The simulation results show that under different floor temperatures,that is,different water supply temperatures,the temperature gradient in the vertical direction of the room is more obvious,and there will be no "feet cooling" phenomenon;the relative humidity meets the second level of thermal comfort;The average PMV is 0.76,and the average PPD is 20.7%.Compared with floor radiant cooling and fan-coil single cooling terminal,the indoor temperature of“floor radiation + fan-coil” combined cooling system meets Class I thermal comfort and the horizontal uniformity is better than the other two cooling terminals.Based on experiments and thermal environment simulation analysis,Energy Plus is used to simulate and analyze the energy consumption of “floor radiation + fan-coil”combined cooling in this paper.The simulation results show that: at a constant water flow rate,when the water supply temperature is 17?,the combined cooling system not only has good cooling capacity,but also has a total energy consumption of 1.05% per k Wh compared to 15?.Compared with the fan coil single cooling system,it can be seen that the “floor radiation + fan coil” combined cooling system can not only provide sufficient cooling capacity,but also the total energy consumption of the system is only higher than that of the fan coil alone.The cold system increased by 0.52%.