Lowering The Sink Temperature For A Desert
Solar Air Conditioning System
Author(s)
M. A. Serag-Eldin
Abstract
The paper addresses the problem of cooling air conditioning systems in desert
environments where ambient air temperatures are high, and cooling towers
should be avoided because of scarcity of water resources. A proposed ground
heat-sink is proposed which exploits the highly effective night-time desert
cooling by long-wave atmospheric radiation. A simple computer model is
presented for the performance of the heat-sink design, which integrates with a
load calculation model for a hypothetical zero energy house, in which the air
conditioning equipment is solar driven. The load-calculation and thermal-sink
models are matched dynamically with the time dependent solar energy
characteristics of the selected site, and predicted results are displayed and
discussed.
Keywords: solar air-conditioning, ZEH, renewable energy, geothermal cooling,
heat sinks, COP.
1 Introduction
Modern designs for desert Zero energy houses (ZEH) provide all modern
comforts, relying on solar energy as the energy source to power the homes
energy needs. By far the largest energy load for this environment is the air
conditioning load, e.g. Serag-Eldin [1]. Air-conditioning equipment
performance is affected heavily by the heat-sink (condenser) temperature, the
higher the latter the lower the COP; indeed above a certain temperature the
equipment mal-functions and may shut-down altogether to protect itself. Cooling
the condenser requires dissipating the heat to a lower temperature environment.
The two common methods of cooling are air cooling by atmospheric air
(releasing heat to the environment directly) and water cooling by circulating
Keywords
solar air-conditioning, ZEH, renewable energy, geothermal cooling,
heat sinks, COP.
Related Book
Other papers in this volume
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