1. UKM Learning and Research Repository
2. PHD Thesis / Tesis PHD
3. Solar Energy Research Institute / Institut Penyelidikan Tenaga Suria (SERI)

Title:	Performance evaluation of a solar assisted absorption cooling system with dual ejectors and flash tank
Authors:	Azher M. Abed (P67975)
Supervisor:	Kamaruzzaman Sopian, Prof. Dr.
Keywords:	Absorption system Solar air conditioning
Issue Date:	Jan-2017
Description:	A new configuration of a single stage solar assisted absorption air conditioning system with dual ejectors and flash tank have been designed, constructed and evaluated. Absorption system is a viable alternative to the compressor cycles, due to their relatively lower electricity consumptions, environmentally friendly and low maintenance requirements. The advantages of the ejectors and flash tank are the simplicity in construction, high reliability, and low cost. The objectives were to develop the theoretical model, to perform the experimental validation and also to conduct the techno-economic analysis. The theoretical models for the single and dual ejectors with a flash tank have been developed. With the single ejector, a new arrangement of solution streamlines between the absorber and generator as well as adding a refrigerant heat exchanger (RHE) between the condenser and evaporator has been conducted. This arrangement has optimized the internal heat recovery and minimized the energy consumption at the generator and absorber. It also improved the quality of the refrigerant that enters the evaporator. With the dual ejectors, the system performance was further enhanced because the cycle utilized the intermediate-pressure of the flash tank and the low-pressure of the evaporator. These dual ejectors were able to operate at a lower circulation ratio, lower generator temperatures, and higher condenser temperatures. The cycle parameters were varied over various operating ranges in order to determine the effect on the cycle performance. A parametric analysis for the ammonia -water absorption cycle under steady-state conditions for both single and dual ejectors were carried using a computer program using EES software based on the first law-based equations of the energy balances. The coefficient of performance (COP) of the single ejector with flash tank showed a significant enhancement of 12.2% over the basic cycle with the flash tank. The COP increment of the single ejector with flash tank with the arrangement of solution streamlines and adding RHE were 8% and 4.2% respectively. The results for the dual ejector with flash tank indicated that the overall COPs increment were 11.56 % , 12.42% , 13.46 % and 14.05 % at generator temperatures of 80oC, 85oC, 90oC,and 95 oC, respectively. An experimental setup was constructed with cooling capacity between 3-5kW and 40 evacuated tube collectors sloped at 14o orientated towards the south. The experimental setup was designed to operate using three different configurations namely (a) basic absorption cycle with single ejector (b) basic absorption cycle with single ejector and flash tank, and (c) basic absorption cycle with dual ejectors and flash tank. Results revealed that the dual ejectors configuration with flash tank has lower generator thermal loads and higher cooling effect. The solar absorption system with dual ejectors and the flash tank also has the highest thermal COP between 0.234–0.465. The COP for the basic configuration and single ejector were between 0.127–0.282 and 0.1700.362 respectively. The techno-economic analysis showed that the combined absorption system using dual ejectors was the preferred option.,Certification of Master's/Doctoral Thesis" is not available
Pages:	213
Call Number:	TH7687.9.A238 2017 3 tesis
Publisher:	UKM, Bangi
Appears in Collections:	Solar Energy Research Institute / Institut Penyelidikan Tenaga Suria (SERI)

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