Optimal control and performance test of solar-assisted cooling system
Resource
Applied Thermal Engineering,30(14-15),2243-2252
APPLIED THERMAL ENGINEERING, 30(14-15), 2243-2252
Journal
Applied Thermal Engineering
Pages
2243-2252
Date Issued
2010-10
Date
2010-10
Author(s)
Abstract
The solar-assisted cooling system (SACH) was developed in the present study. The ejector cooling system (ECS) is driven by solar heat and connected in parallel with an inverter-type air conditioner (A/C). The cooling load can be supplied by the ECS when solar energy is available and the input power of the A/C can be reduced. In variable weather, the ECS will probably operate at off-design condition of ejector and the cooling capability of the ECS can be lost completely. In order to make the ejector operate at critical or non-critical double-choking condition to obtain a better performance, an electronic expansion valve was installed in the suction line of the ejector to regulate the opening of the expansion valve to control the evaporator temperature. This will make the SACH always produce cooling effect even at lower solar radiation periods while the ejector performs at off-design conditions. The energy saving of A/C is experimentally shown 50-70% due to the cooling performance of ECS. The long-term performance test results show that the daily energy saving is around 30-70% as compared to the energy consumption of A/C alone (without solar-driven ECS). The total energy saving of A/C is 52% over the entire test period. © 2010 Elsevier Ltd. All rights reserved.
SDGs
Other Subjects
Air conditioners; Cooling capability; Cooling effects; Cooling load; Cooling performance; Ejector cooling system; Ejector system; Electronic expansion valves; Energy consumption; Energy saving; Evaporator temperature; Expansion valves; Input power; Long term performance; Off design condition; Optimal controls; Performance tests; Solar cooling; Solar heat; Suction line; Total energy; Air conditioning; Air ejectors; Cooling; Cooling systems; Ejectors (pumps); Energy conservation; Solar radiation; Sun; Thermoelectric equipment; Solar energy
Type
journal article
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