Engineering Design Construction and Testing of a Salt-Water Absorption Unit Optimized for Use with a Solar Collector Heat Source

摘要

The development of a 3 ton direct evaporatively cooled LiBr chiller and the construction of three operable field test units suitable for use with flat plate collectors is reported. Compared to conventional LiBr chillers using shell and tube heat exchangers and a separate cooling tower this approach aims to reduce first cost, installation cost and parasitic power. The unit is packaged into a size approximately 94 cm square and 2 meters tall. It produces 7.2 exp 0 C (45F) chilled water with a .72 COP when fired with 89.4 exp 0 C (193F) hot water while rejecting heat to 25.6 exp 0 C (78F) wb ambient air. Power to operate the condenser fan, solution pump and surface wetting pump is 450 watts. This unit deals with water freezing by making the sump and wetting pump freeze resistant so that seasonal draining is not required. Low heat flux through the wetted surfaces yields performance insensitivity to the accumulation of scale. (ERA citation 06:010625)