2017_EJRNL_PP_P_E__Vende_1.pdf
Terbatas Irwan Sofiyan
» ITB
Terbatas Irwan Sofiyan
» ITB
Due to climate change, worldwide power consumption for air conditioning is forecasted to increase by
33 times its current level by 2100. To face this trend, the efficiency of air conditioning and refrigeration
systems must increase. Water spraying on the condenser of a refrigeration unit is one solution to reach
this aim. Indeed, spraying water on a heat exchanger improves heat transfer by adiabatic cooling or direct
impact on the heat-exchanger surface.
In the present paper, water spraying is designed for an embedded air conditioning application. A pilot
designed for air conditioning conditions was built and equipped with a set of atomizer. The results
obtained with this pilot show that heat transfer enhancement is higher at low heat exchanger surface
temperature. Moreover, a thermal image analysis has highlighted that the surface impacted by the spray
excluding the clogged parts is appropriate to express the local efficiency of the spray. Indeed, this surface
reaches a steady-state approximately after the same time than heat transfer enhancement. This surface
depends on heat-exchanger surface temperature, and not on the air flow. Finally, the efficiency of water
spraying on a heat exchanger is correlated with the impacted surface.