吸收式热泵驱动太阳能集热场耦合集中供热性能研究

STUDY ON COUPLED HEATING PERFORMANCE OF ABSORPTION HEAT PUMP DRIVING SOLAR COLLECTOR SYSTEM

提出一种吸收式热泵驱动大型太阳能集热场耦合集中供热新系统。建立吸收式热泵-太阳能集热场热力耦合数学模型,构建TRNSYS仿真模型并提出系统性能评价指标。以拉萨市为例,对该新型耦合供热系统进行分析计算。结果显示:在平板太阳能集热器面积与聚光型太阳能集热器面积相同的条件下,与现有太阳能供热系统和简单的平板-聚光型太阳能集热器串联太阳能供热系统相比,该新型耦合供热系统集热效率可增大约5%,且随着平板太阳能集热器面积与聚光型太阳能集热器面积之比增大,平板太阳能太阳能集热器入口温度逐渐降低,集热效率进一步增大;随着吸收式热泵容量与平板太阳能集热器面积之比增大,平板太阳能集热器入口温度逐渐降低,集热效率进一步增大,证明了该耦合系统的增效特性。但该耦合供热系统较复杂、投资成本较大,因此对于大型太阳能集中供热系统经济效益凸显,而小型太阳能供热系统则不适用。

In this paper,a new large-scale solar central coupled heating system is presented driven by absorption heat pump.The mathematical model and the TRNSYS simulation model of the absorption heat pump-solar heat collection field is established,and the performance evaluation index is proposed.Taking Lhasa as an example,the performance of the new coupled heating system is calculated and analyzed.The results show that compared with the existing solar heating system and the simple flat plate-concentrating collector series heating system under the same heat collecting area(concentrating+flat-plate collector areas),the efficiency of the absorption heat pump-solar heat collecting coupled heating system is increased by about 5%.As the area ratio of the concentrating collector to the flat-plate collector increases,the inlet temperature of the flat-plate collector gradually decreases,and the heat collecting efficiency is increased.With the capacity ratio of the absorption heat pump to the area of the flat-plate collector increases,the inlet temperature of the flat-plate collector gradually decreases and the heat collection efficiency gradually decreases,proving the efficiency improvement of the coupling system.In addition,the coupled heating system is more complex and has a higher investment cost,so the economic benefit is prominent for large solar central heating system,while small solar heating system is not applicable.