Jadidi Hossein, Keyanpour-Rad Mansoor, Haghgou Hamidreza, Chodani Behdad, Kianpour Rad Simin, Hasheminejad Seyed Mahmoud
Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran.
Department of Energy, Material and Energy Research Centre, Tehran, Iran.
Heliyon. 2022 Aug 2;8(8):e10144. doi: 10.1016/j.heliyon.2022.e10144. eCollection 2022 Aug.
This paper addresses hourly simulation of 3.5 kW Solar Ejector Cooling System (SECS) using R600a and R290 hydrocarbon refrigerants for application in two office buildings in semi-arid and hot-humid climates of Iran. During the period of the study, thermodynamics energy and exergy of the cooling systems when charged with the two refrigerants are fully assessed by simulation at the two study sites. The simulation studies of the entire cooling system indicate that the most irreversible process and hence the prime exergy destruction is related to the solar collector system followed by the ejector component in the cooling cycle. The ejector is a constant-area mixing (CAM) type which is mathematically modeled in Engineering Equation Solver (EES) software. Generator of the cooling cycle is modeled in EES using method and a simulation program is developed on TRNSYS-EES co-simulator for dynamic study of the cooling cycle. For comparison of efficiency of the two refrigerants, working conditions are set to be the same. The systems are equipped with auxiliary heaters to provide constant inlet temperature of for the generator when solar radiation is partially in phase with the building sites. The hourly and monthly simulation of both SECS in June, July, August and September 2019 demonstrate that R290 is more efficient for increasing the overall of the system than R600a of the building office in the semi-arid region where the generator receives most of its thermal energy from solar radiation in July 17, 2019. Although, the same refrigerant is also more efficient than R600a in the hot-humid region system in the same day, but the system compensates shortage of its necessary solar thermal energy mostly from the auxiliary heater.
本文探讨了采用R600a和R290碳氢制冷剂的3.5千瓦太阳能喷射制冷系统（SECS）的小时模拟，该系统应用于伊朗半干旱和炎热潮湿气候的两座办公楼。在研究期间，通过在两个研究地点进行模拟，全面评估了充注这两种制冷剂时制冷系统的热力学能和㶲。整个制冷系统的模拟研究表明，最不可逆的过程以及主要的㶲损失与太阳能集热器系统有关，其次是制冷循环中的喷射器组件。喷射器为等面积混合（CAM）型，在工程方程求解器（EES）软件中进行数学建模。制冷循环的发生器在EES中采用[具体方法]进行建模，并在TRNSYS - EES联合模拟器上开发了一个模拟程序，用于制冷循环的动态研究。为了比较两种制冷剂的效率，设定工作条件相同。当太阳辐射与建筑地点部分同步时，系统配备辅助加热器，为发生器提供恒定的入口温度[具体温度值]。2019年6月、7月、8月和9月对两个SECS的小时和月度模拟表明，在半干旱地区，2019年7月17日发生器的大部分热能来自太阳辐射，对于提高办公楼系统的整体[具体指标]，R290比R600a更高效。虽然在同一天，相同的制冷剂在炎热潮湿地区系统中也比R600a更高效，但该系统主要从辅助加热器补偿其所需太阳能热能的不足。
