TWO-STAGE EVAPORATING COOLER WITH RHCh The Institute of Power Engineering and Automation of the Academy of Sciences of Republic of Uzbekistan

Advantages of evaporating cooler (conditioner) Reduce of electrical energy consumption by 4-5 times in comparison with compression conditioners Optimizing of humidity of cooled air Lack of compressor and increasing of reliability Simplification of design, reduce of materials consumption and manufacturing content Low cost (at 3-4 times) Possibility to combine with alternative electrical sources (particularly, with photovoltaic or thermoelectric generators)

Physical basis Evaporation heat of water is 2.4 MJ/kg at 40 °C Specific heat is 1 kJ/(kg K) for air and 4.8 kJ/(kg K) for water at 40 °C There is 54.2 g water steam in 1 m3 air at 100 % relative humidity and 40 °C There is 8.13 g water steam in 1 m3 air at 14 % relative humidity and 40 °C Decreasing of air temperature as a result of additional water evaporation Energy consumption for air and water supply only

Two-stage evaporative cooler with RHCh (schematic) 1 and 2 are revolving heat changers (RHCh) 3 and 10 are water 4 is atmospheric air 5, 6 and 7 are air flows into RHCh 8 is humid air into atmosphere 9 is air after first RHCh 11 and 12 are cooled air into room

Design of evaporative cooler having two RHCh (domestic version) Without the enclosure Driver of RHCh and water pump are seen here Arrows show air flows With the enclosure Fans and jalousie for out coming air of first stage are seen here Power consumption is 50 W, cooling power is 200 W

Photos of the laboratory prototype

State of art and prospects A patent application for a new design of the evaporative cooler of higher efficiency has prepared now. The design documentation of its version for moderate rooms (20-25 m2) is prepared to conjoint produce with private enterprise “Vershina Olimpa” (Tashkent) The design documentation of last one for moderate rooms (20-25 m2) and photovoltaic power supply will be prepared in nearest future