Authors
Abstract
An adsorption heat pipe was designed and built from a stainless steel tube of 32
mm outer diameter, 30 mm inner diameter and 1000 mm long, the inner surface of the
tube was coated by 10 mm thickness of active carbon, which was assumed to be the
adsorbent, while the adsorbent was assumed to be the methanol, or acetone. The
adsorption heat pipe consist of three zones, namely adsorption/ desorption, adiabatic
and evaporation/condensation zones. Electrical heater with variables capacity is used to
heat up the unit generator during desorption process, water was used to cool the
condenser, while air was used to cool the generator. Two types of adsorption pair are
used, namely active carbon-methanol and active carbon-acetone. The effect of heat
input to the generator on the heat pipe surface temperature and evaporator temperature
are studied. The results showed that the adsorption heat pipe can work at a relatively
low temperature namely 70-100 oC, the time required for cooling process in the range
of 18 to 24 minutes, and activated carbon – Acetone pair gave a good behavior for the
heat pipe due to the short cycle– time compared with that for activated carbon –
Methanol
Keywords
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