The two-phase thermosyphon loop is an efficient
solution for space cooling. This paper presents the simulation results of
numerical studies on the heat transfer and thermal performance of a two-phase
thermosiphon loop for passive air-conditioning of a house. The fluid considered
in this study is methanol, which is compatible with copper and is environmentally
friendly. These numerical results show that the temperature at the evaporator
wall drops from 23°C to 13°C and increases at the condenser. The solar flux
density has a strong influence on the condenser temperature. The mass flow
rates and masses at the evaporator and condenser increase with temperature. The
variation of evaporating and condensing temperature affects the performance of
the system. For a constant evaporating and condensing temperature of 2°C and
29°C, the COP is 0.77 and 0.84 respectively. With these results, the use of the
two-phase thermosyphon loop in air conditioning is possible to obtain a thermal
comfort of the occupants acceptable by the standards but with a large exchange
surface of the evaporator.
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