用于冷凝热回收的热水循环系统可行性研究

Feasibility of Hot Water Cycling Assistant System for Condensing Heat Recovery

传统的冷凝热回收技术多是对夏季制冷工况的研究,很少涉及到冬季制热工况。研究基于热力学建模机理和冷凝热回收技术设计出一个热水循环辅助系统,它在夏季能够充分回收蒸汽压缩式热泵机组在制冷模式下运行产生的冷凝热,制取温度适中的生活热水储存于保温水箱,满足用户需求;在冬季可以吸收部分冷凝热后在蒸发器中释放热量,使液态制冷剂汽化,满足热泵机组制热模式的运行需求,可以代替传统热泵的地下水源或者土壤源子系统。以兰州市某宾馆的蒸汽压缩式热泵机组作为案例,设计了相应的热水循环辅助系统,并通过热力学仿真加以验证。结果表明,该热水循环辅助系统的实施在理论上是可行的,且在节能和降低系统初始投资方面效果明显。

The traditional condensing heat recovery technology mostly focuses on the summer cooling con- dition of a vapor compression heat pump unit but rarely on its winter heating condition. A hot water cycling assistant system based on the thermodynamic modeling principle and heat recovery technology was de- vised,which,in summer,completely recovered the condensing heat from the vapor compression heat pump unit in cooling mode and produced sanitary hot water with suitable temperature and then stored it in a tank for users. In winter,the system absorbed a part of condensing heat from the vapor compression heat pump unit in heating mode and then released the heat to evaporate liquid refrigerant in the evaporator for its heat- ing mode,which replaced the subsystem of underground water source or soil source of the traditional heat pump. A vapor compression heat pump unit in a given hotel in Lanzhou was redesigned and its performance was verified through thermodynamic simulation. The results showed that the devised system was feasible and also achieved practical purposes of energy saving and cutting initial investment.