By Gert Jan Bom, Robert Foster, Ebel Dijkstra, Marja Tummers
'Under the proper stipulations and purposes, evaporative air-conditioning (EAC) applied sciences offers first-class cooling and air flow with minimum power consumption.'
Evaporative air-conditioning applied sciences are getting used more and more in residential and advertisement purposes around the world. EAC applied sciences, which depend upon water as a coolant instead of on chemical refrigerants, are low-priced to supply and use and feature vital environmental merits. This paper introduces the technical points of EAC, stories EAC's scope of software, and surveys the explicit weather conditions below which EAC can be utilized so much successfully in industrialized and constructing international locations.
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Additional resources for Evaporative Air-Conditioning: Applications for Environmentally Friendly Cooling
Energy DB Heat needed :::. to evaporate Sensibl energy water Direct evaporative ~~~cooler 210 C heat D Water ha You feel 21°C Sensible and latent heat energy You feel 35°C Sensible heat in the air is used to evaporate water (transfered to latent energy in the moist air) Source:Authors. A psychrometric chart, which shows moist air properties, more clearly demonstrates the evaporative cooling process. The initial dry-bulb and wet-bulb temperatures are shown at the start of the process, and the endpoint of the evaporative cooling process is found to the left at the end of the arrow along the line of constant wet-bulb temperature.
However, the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE)standards committees on EAC have submitted a proposed test standard for testing indirect evaporative air conditioning equipment adopted by ASHRAE in 1996. When these standards are adopted, the industry worldwide will benefit from a proposed certification program for rating EACs based on the ASHRAE test standards by the Evaporative Cooling Institute. This certification program will provide design engineers worldwide with an independent performance-based test standard for rating EACunits.
4. Close-up of Rigid Cellulose Pad Made of Corrugated Paper Source:Munters Corporation. , dust washes off) No biological deterioration of the pad material More consistent saturation efficiency of about 75 to 90 percent Low pressure drop across the pad. The disadvantage is that rigid media are more costly (about US$100more on an EAC that would cost US$300if using aspen wood pads). They are also bulkier, which makes them difficult to use in smaller units. At present, about 25 percent of the EACs sold in the United States are fitted with rigid pads, a share Technology 25 that is growing.
Evaporative Air-Conditioning: Applications for Environmentally Friendly Cooling by Gert Jan Bom, Robert Foster, Ebel Dijkstra, Marja Tummers