基于TRNSYS的主动式建筑相变蓄冷空调系统模拟

Simulation of phase change cold storage air conditioning system for active building based on TRNSYS

以夏热冬冷地区的办公建筑为例,利用瞬态系统仿真程序(transient system simulation program, TRNSYS)构建主动式相变蓄能地板模块,建立了主动式相变蓄能地板空调系统和常规风机盘管加新风空调系统的仿真模型,对其节能性和经济性进行模拟计算.以典型日和供冷季晚间蓄冷运行工况为条件,研究冷冻水温对主动式相变蓄能地板的蓄释能特性、室温波动与热泵制冷系数的影响.结果表明:夜间相变蓄冷工况下,在满足每平方米冷负荷为74.78 W情况下,9℃为最佳供水水温;采取晚间低电价时段间歇运行蓄冷热泵的方案,能够有效提高热泵运行时的制冷系数,并降低运行费用;主动式相变蓄能地板空调系统供冷季的能耗相比于常规风机盘管加新风空调系统减少30.5%,运行费用减少44.24%,夏季制冷综合能效比达到了2.38.

Taking the building in hot summer and cold winter zone as research object,the transient system simulation program(TRNSYS)simulation platform was used to build the active phase change energy storage floor module.The simulation model of the active phase change cold storage floor air conditioning system and the conventional fan coil plus fresh air conditioning system was established,and the energy saving and economy were simulated and calculated.The effects of chilled water temperature on energy storage and release characteristics of active phase change energy storage floor,room temperature fluctuation and coefficient of performance(COP)of heat pump were investigated under the condition of night cold storage operation in the cooling season and typical day.The results show that under the condition of phase change cold storage at night,the optimal chilled water temperature is 9℃when the cooling load per square meter is 74.78 W.When the cold storage heat pump adopts the intermittent operation scheme with low electricity price at night,the COP of heat pump operation can be effectively improved with reduced operation cost.Compared with the conventional fan coil plus fresh air air-conditioning system,the energy consumption of the active phase change energy storage floor air-conditioning system in the cooling season is reduced by 30.5%with operating cost reduced by 44.24%,and the comprehensive refrigeration energy efficiency ratio reaches 2.38 in summer.