Abstract
Evaporative cooling is one of the techniques to lower the ambient air temperature according to the requirements. The technique includes the injection of moisture in the coming air, thus increasing its specific humidity. This technique can cool the air up to wet bulb temperature of the incoming air. In the recent past, the techniques are developed to lower the temperature of air without addition of moisture in the incoming air. These techniques demonstrate that the incoming air temperature can be approached near the dew point temperature of the incoming air. The present paper essentially focuses on the recent theoretical and experimental research of dew point evaporative coolers. Different flow configurations of heat exchange mediums, optimization of geometrical parameters, performance parameters (wet bulb and dew point effectiveness), energy efficiency ratio and energy saving potential are the key elements to study the prospects of dew point evaporative coolers over the conventional refrigeration systems operated by mechanical means. Dew point evaporative cooling technology is environmental friendly and has the potential in reducing the impact on earth due to global warming.
Highlights
The usage of conventional air conditioning system for residential, commercial and industrial applications contributes to the bulk consumption of electrical units
Based upon four different cliamatic conditions investgated, the results showed substantially enhanced scope for the hour basis optimization technique to escalate the objective functions 18.7, 19.6 and 36.2% on an average
The performance of the dew point evaporative cooler is governed significantly by operational and geometrical parameters. Those parameters can be further used for the experimental investigations and numerical validation for a small capacity domestic air conditioning system based on the usage of non-conventional energy for the year round climate
Summary
The usage of conventional air conditioning system for residential, commercial and industrial applications contributes to the bulk consumption of electrical units. The consumption trends across world wide leads to climate change, which may further worsen the situations in the coming future. It is the need of the hour to make available better options for the cooling pusposes. Liu et al [1] investigated experimentally and theoretically the refrigeration behaviour of a highly efficient dew point evaporative cooler using most effective air and water flow arrangements. On account of usage of corrugated plates helped to achieve the cooling efficiency more that 10% as compared to flat plates. Further the refrigeration efficiency of dew point cooler in original configuration is only 62-67% that of a dew point evaporative cooler as compared to counter flow.
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