太阳能燃气热泵供暖系统及余热回收分析

对太阳能燃气热泵供暖系统及余热回收性能进行了研究。建立了系统的仿真模型,对套缸冷却系统和排烟余热回收器进行了模拟计算。分析了套缸冷却水流量的变化规律、确定了排烟余热回收比(排烟余热中回收的热量占排烟余热总热量的比例)、热回收循环水流经套缸冷却器及排烟余热回收器后的温升情况,最后以沈阳地区某建筑为例,对系统余热回收的经济性进行了分析。结果表明:发动机转速每增加100r/min,所需的套缸冷却水流量增0.285~1.21g/s;排烟余热回收比为0.7时,系统可以获得最大的能源利用率(是指有效利用部分与总能源量的比值);热回收循环水流经套缸冷却器后温度上升2~5℃,在最佳的余热回收比下,热回收循环水流经排烟余热回收器后温度可提高2℃左右;运行时间超过2年时,余热回收型太阳能燃气热泵比非余热回收型太阳能燃气热泵更加经济。

Waste Heat Recovery Analysis of Solar Energy and Gas Heat Pump Heating System

The performance of waste heat recovery of solar energy and gas heat pump system was studied. The simulation model of the system,the cylinder cooling systems and exhaust waste heat recovery device are established in Matlab. The changing rule of the cylinder cooling water flow rate,the controlling of waste heat recovery ratio and the temperature rising of heating recovery water flowing through the cylinder cooler and the waste heat recovery device are analyzed in this paper. Finally,the economic of solar energy and gas heat pump with waste heat recovery device for a certain building in Shenyang area are made in certain extent. The results are shown in the following: when the engine revolutions increases 100 r / min,the cooling water flow rate are increased by0. 285 ~ 1. 21 g / s. When the waste heat recovery ratio is 0. 7,the energy utilization of the system are achieved in this condition.The temperature of heat recovery circulating water are increased by 2 ~ 5 ℃ after flowing through the cylinder cooling systems.The temperature of heat recovery circulating water are increased by 2 ℃ after flowing through the exhaust waste heat recovery device. Solar energy and gas heat pump with heat recovery device is more economical than the system of non- heat recovery device.