DCCHP排烟余热耦合空气源热泵系统性能分析

Performance Analysis of the DCCHP Exhaust Waste Heat Coupled Air Source Heat Pump System

内燃机冷热电联供系统作为一种高效的能源利用方式,排烟余热回收后的排放温度在100℃左右,仍有部分低温余热没有充分利用,提出一种分布式冷热电三联供(distributedcombinedcoolingheatingandpower,DCCHP)动力排烟低温余热耦合空气源热泵系统,实现了排烟余热的深度回收。以10 kW内燃机冷热电联供为基础,研究了该系统可回收余热量、热泵循环性能系数(coefficient of performance,COP)以及对一次能源利用率的影响。结果表明:在设计工况下,DCCHP系统排烟余热1.22 kW,热泵系统回收余热量可达1.07 kW,排烟余热回收率达到87.7%;热泵COP高达4.66,提高39.5%;系统一次能源利用率提高3.9%;同时解决了寒冷地区冬季热泵机组蒸发器结霜、低温环境下运行性能差的问题。此研究为冷热电联供系统与热泵机组的联合高效应用提供了重要的参考。

As an efficient way of energy utilization,the exhaust temperature after exhaust waste heat recovery of the internal combustion engine distributed combined cooling heating and power(DCCHP)systems is about 100℃,and some of the low temperature waste heat is still not fully utilized.To achieve the deep recovery of exhaust waste heat,a DCCHP dynamic exhaust low temperature waste heat coupled air source heat pump system was proposed in this paper.Based on the DCCHP system of 10 kW internal combustion engine,the effects of the recyclable waste heat of the system,the coefficient of performance(COP)of the heat pump and the impact of the primary energy utilization rate was studied.The results show that under the design condition,the exhaust waste heat of DCCHP system is 1.22 kW,the recyclable waste heat of heat pump system is up to 1.07 kW,the exhaust waste heat recovery rate is 87.7%,the COP is up to 4.66,increasing 39.5%.The primary energy utilization efficiency is increased by 3.9%.The problems of frosting and poor performance of heat pump evaporator unit in cold region were solved.This study provides an important reference for the combined and efficient application of CCHP systems and heat pump units.