不同散热末端下直膨式热泵供暖系统热舒适性的实验与模拟研究

Experimental and Simulation Study on Thermal Comfort of Direct Expansion Heat Pump Heating System with Different Heat Dissipation Terminals

采用实验和模拟的方法,对不同散热末端下直膨式空气源热泵供暖系统的热舒适性进行研究。通过实验对比研究采用新型热虹吸散热末端的直膨式空气源热泵(direct expansion air-source heat pump using thermosiphon radiator,DE-HP-T)与传统热风空调散热末端时,直膨式空气源热泵供暖系统的室内空气温度分布特征,重点分析系统启动阶段的动态热环境变化差异;在验证模型的可靠性后,通过数值模拟的方法对直膨式空气源热泵耦合不同末端供暖时,室内的非均匀稳态热环境进行研究分析,并采用等效温度指标对人体局部及整体的热舒适性进行评价。结果表明,DE-HP-T系统在启动阶段室内空气温升速度较快,可达到10.8℃/h,略小于传统热风空调系统的13.8℃/h;但与传统热风空调系统相比,DE-HP-T系统可以避免人体头脚温差过大以及“冷辐射”所造成的热舒适问题,有效提高人体小腿及脚部的热舒适性,具有更加舒适的整体热感觉。

The experimental and simulation methods were used to study the thermal comfort of the direct air source heat pump heating system with different heat dissipation terminals.The indoor air temperature distribution characteristics of the direct expansion air source heat pump heating system were compared experimentally in case of using the new thermosiphon radiator(DE-HP-T)and of the traditional hot air-conditioning dissipating terminal.Furthermore,the dynamic thermal environment variation of the system startup phase was analyzed.After verifying the reliability of the model,the indoor non-uniform steady-state thermal environment of the direct expansion air source heat pump heating system using different heating terminals was simulated,thermal comfort of the local and overall thermal sensation was evaluated by the equivalent temperature index.The results show that the rise of temperature of the indoor air in the DE-HP-T system is fast,reaching 10.8℃/h,which is slightly lower than 13.8℃/h of the traditional hot air conditioning system.However,compared with the traditional hot air conditioning system,the DE-HP-T system can avoid the thermal discomfort caused by excessive temperature difference on head and foot or cold radiation.At same time,it can satisfy persons’thermal comfort on calf and foot,and has more comfortable overall thermal sensation.