SIMULATION OF A LiBr ABSORPTION SOLAR COOLING SYSTEM AND GLOBAL WARMING IMPACT ESTIMATION

摘要

The objective of this paper is to present the modelling of a complete lithium bromide (LiBr)-water absorptionrnsystem and perform a global warming impact assessment. The system is modelled with the TRNSYSrnsimulation program and the typical meteorological year file containing the weather parameters for a hotrnclimate (Nicosia, Cyprus). Initially the LiBr cooler is modelled in order to derive the polynomial equations tornbe used in the TRNSYS deck file. These equations relate the unit capacity with the solution heat exchangerrnexit temperature, the coefficient of performance and the generator heat. The system considered employs arncompound parabolic type collector 15 m2 in area, sloped at 30° and a storage tank size of 600 lt. Subsequentlyrnthe global warming impact of the system is evaluated by estimating the total equivalent warming impactrn(TEWI) of the system in comparison to a system utilising a conventional R-22 air conditioner. The TEWI ofrnthe solar assisted system is about 107,200 kg CO_2 and is lower than that of a conventional R-22 air conditionerrnsystem, which is 132,800 kg of CO_2.