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Department of Mechanical Engineering, Aligarh Muslim University,

Aligarh (INDIA).

E-Mail: altamushsiddiqui@yahoo.co.in

ABSTRACT

Irreversibility analysis of the lithium bromide water absorption system and economic evaluation of the flat plate solar collector required to operate it have been carried out to optimize the generator temperatures. The heat transfer rate, exergy flow and irreversibility, along with the solar collector surface area and its cost, obtained for different operating conditions are exhibited graphically. The total irreversibility in the system as well as the area and cost of the solar collector show minima at certain temperatures in the generator. The optimum generator temperatures corresponding to the minimum area/cost of the solar collector are found quite close to those obtained corresponding to the minimum total irreversibility in the system.

Keywords: energy; exergy; LiBr-water; optimum temperatures; solar-absorption system.