Sezen Kutbay, Tuncer Azim Doğuş, Akyuz Ali Ozhan, Gungor Afsin
Department of Mechanical Engineering, Akdeniz University, Antalya, Turkey; ALTSO Vocational School of Higher Education, Alanya Alaaddin Keykubat University, Antalya, Turkey.
Department of Energy Systems Engineering, Burdur Mehmet Akif Ersoy University, Burdur, Turkey; Natural and Applied Science Institute, Gazi University, Ankara, Turkey.
Sci Total Environ. 2021 Jul 15;778:146362. doi: 10.1016/j.scitotenv.2021.146362. Epub 2021 Mar 11.
Solar assisted heat pump (SAHP) systems aim to increase the performance of heat pumps by supporting with solar energy using various heating modes, whose performances depend on ambient conditions. In the literature, SAHP systems are classified by structure types, and the heating mode options are not considered as the main priority of the design but a result of the structure of the system. This paper aimed to investigate the effect of ambient conditions on heating modes, and identify the preferable ambient condition ranges for each SAHP system depends on their heating modes, by using a narrative review of 47 recent studies, that shed light on the problem. For this purpose, direct solar heating (DSH), air source heat pump (ASHP), solar source heat pump (SSHP) and solar-air source heat pump (S/ASHP) modes were stated as the basic heating modes of SAHP systems. In accordance with the literature, SAHP systems were classified as direct expansion solar assisted heat pump (DX-SAHP) and series, parallel and dual source indirect expansion solar assisted heat pumps (IDX-SAHP). Solar irradiation, ambient temperature, relative humidity and wind speed has been taken as major ambient conditions to investigate. Reviewed studies indicated that, parallel and series IDX-SAHP are preferable in high solar irradiations about 800 W/m with their DSH mode options. Frosting on evaporator is prevented in DX-SAHP with its S/ASHP mode, and even in the presence of frosting, unlike IDX-SAHPs ASHP mode, freezing is a factor that improves performance on flat evaporator in cold and humid conditions. This study indicates that there are obscure areas for future studies to focus on for a better comparison between SAHP types. Moreover, proposed novel designs of this paper, such as solar preheating of air in IDX-SAHP systems to add S/ASHP mode as an option, might enhance the performance and applicability of SAHP systems.
太阳能辅助热泵（SAHP）系统旨在通过利用各种加热模式的太阳能来提高热泵的性能，其性能取决于环境条件。在文献中，SAHP系统按结构类型分类，加热模式选项并非设计的主要优先考虑因素，而是系统结构的结果。本文旨在通过对47项近期研究的叙述性综述，探讨环境条件对加热模式的影响，并确定每种SAHP系统根据其加热模式的优选环境条件范围，这些研究为该问题提供了线索。为此，直接太阳能加热（DSH）、空气源热泵（ASHP）、太阳能源热泵（SSHP）和太阳能 - 空气源热泵（S/ASHP）模式被列为SAHP系统的基本加热模式。根据文献，SAHP系统分为直接膨胀太阳能辅助热泵（DX - SAHP）以及串联、并联和双源间接膨胀太阳能辅助热泵（IDX - SAHP）。太阳辐射、环境温度、相对湿度和风速被作为主要环境条件进行研究。综述研究表明，并联和串联IDX - SAHP在约800 W/m的高太阳辐射下，其DSH模式选项更具优势。DX - SAHP的S/ASHP模式可防止蒸发器结霜，而且即使存在结霜情况，与IDX - SAHP的ASHP模式不同，在寒冷潮湿条件下，结冰是提高平板蒸发器性能的一个因素。本研究表明，在SAHP类型之间进行更好的比较方面，仍存在未来研究需关注的模糊领域。此外，本文提出的新颖设计，如在IDX - SAHP系统中对空气进行太阳能预热以增加S/ASHP模式作为一种选择，可能会提高SAHP系统的性能和适用性。
