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Exergy Evaluation of a Heat Supply System with Vapor Compression Heat Pumps

机译:具有蒸汽压缩热泵的供热系统的高度评价

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摘要

The vapor compression heat pumps are very popular solutions regarding heat supply systems of modern, low energy buildings. It is partly due to the fact that they are treated as a sustainable heat supply. The question arises: Can a vapor compression heat pump be treated as a sustainable heat supply? To answer this question; the exergy model of a heat pump system operation has been proposed. The proposed model has been employed for evaluation of exergy efficiency of an existing heat supply system equipped with two heat pumps installed in an educational building located on the campus of Poznan University of Technology, Poznan, Poland. The analysis shows that the system exergy efficiency decreases with an increase in outdoor temperature and its values are in the range of 10.9% to 42.0%. The primary exergy efficiency, which considers the conversion of fossil fuel into electricity, is on average 3.2 times lower than the system exergy efficiency for the outdoor temperature range of −9 °C to 11 °C. The performed analysis allowed for the identification of a set of solutions that may increase the exergy and primary exergy efficiency of the system. The first solution is to cover a part of the electricity demand by a renewable energy source. The second proposition is to apply a low-temperature emission system for heating. The third idea is to apply a district heating network as the heat supply instead of the heat pump. The conclusion is that the exergy performance of systems with heat pumps is rather poor because they generate low-quality heat from high-quality electricity. The best way to improve the primary exergy efficiency of a heat pump system is to power the system by electricity generated from a renewable energy source.
机译:蒸汽压缩热泵是关于现代低能量建筑的供热系统的气息非常流行的解决方案。部分原因是它们被视为可持续的供热。出现问题:可以将蒸汽压缩热泵视为可持续的供热?回答这个问题;提出了热泵系统操作的漏洞模型。该拟议的模型已被用于评估现有的供热系统的高效率,配备有两个热泵,该系统安装在波兰波兰波兹南大学校园的教育建筑中。分析表明,系统高达效率随着室外温度的增加而降低,其值在10.9%至42.0%的范围内。认为化石燃料转化为电力的主要漏极效率平均比系统高达-9°C至11°C的户外温度范围低3.2倍。执行的分析允许识别一组可能提高系统的漏极和初级漏极效率的一组解决方案。第一种解决方案是通过可再生能源覆盖一部分电力需求。第二个命题是应用低温排放系统以加热。第三种思想是将区域加热网络应用为热源而不是热泵。结论是,具有热泵的系统的高达性能相当差,因为它们从高质量的电力产生低质量的热量。提高热泵系统初级漏极效率的最佳方法是通过从可再生能源产生的电力为系统供电。

著录项

  • 作者

    Agata Rijs; Tomasz Mróz;

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  • 年度 2019
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  • 原文格式 PDF
  • 正文语种 eng
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