地埋管风道与污水源热泵耦合系统经济性分析

Economic Analysis of Ground-buried Duct Air Channel Coupled with Sewage-ource Heat Pump System

现有的技术中,空气源热泵、水源热泵受到地理环境的影响,效率比较低。单独的空气源热泵冬季供暖在除霜方面比较困难,水源热泵和空气源热泵耦合系统、水源热泵和太阳能耦合系统等,造价方面又较昂贵。故提出地埋管风道与污水源热泵耦合系统,即地埋通风管利用浅层地热能加热(冷却)空气。对设计的系统进行数值模拟,计算得出该系统对冷热空气的预加热温差,通过计算得出总长32m,直径0.25m的模型,在空气入口流速为2m/s时,-8.3℃的冷空气被加热到8.83℃;27.8℃的热空气被冷却到14.78℃;一个供暖期可节省1.84×10^(3)元;供暖系统的节能率可达到41.99%;一个制冷期可节省7.11×10^(2)元,制冷系统的节能率可达到9.67%,每年节约费用为2.55×10^(3)元。结果表明,地埋通风管的使用,能够有效提高空气温度,对于热泵设备节约能源、减少碳排放有广阔的发展前景。

In existing technologies,air-source heat pumps and water-source heat pumps are affected by geographical environments,resulting in relatively low efficiency.Standalone air-source heat pumps face difficulties in defrosting during winter heating,while coupling systems such as water-source heat pump and air-source heat pump,or water-source heat pump and solar energy,are costly.Therefore,this paper proposes a system that couples ground-buried duct air channels with sewage-source heat pumps,utilizing shallow geothermal energy to heat(cool)air.Numerical simulations were conducted to evaluate the designed system,and the preheating temperature difference of the system for cold and hot air was calculated.Based on a model with a total length of 32m and a diameter of 0.25m,at an air inlet velocity of 2m/s,-8.3℃cold air was heated to 8.83℃,while 27.8℃hot air was cooled to 14.78℃.The system can save 1.84×10^(3) yuan during a heating season,with an energy-saving rate of 41.99%for the heating system.During a cooling season,it can save 7.11×10^(2) yuan,with an energy-saving rate of 9.67%for the cooling system,resulting in an annual cost saving of 2.55×10^(3) yuan.The results demonstrate that the use of ground-buried duct air channels can effectively increase air temperature and offer promising prospects for energy-saving and carbon emission reduction in heat pump systems.