Heat and Mass Transfer

, Volume 55, Issue 12, pp 3523–3536 | Cite as

Proposal and month-wise performance evaluation of a novel dual-mode evaporative cooler

  • Sarvesh Kashyap
  • Jahar SarkarEmail author
  • Amitesh Kumar


Three climatic zones (composite, hot-dry, hot-humid) cover most of the regions in India. Direct evaporative cooler is suitable for dry and indirect regenerative evaporative cooler is suitable for humid months. To avoid the use of two different coolers for the same purpose during the composite climate (significant seasonal variations of temperature and humidity), a novel two-in-one evaporative cooler is proposed and numerically investigated in this study. Proposed cooler takes advantage of both types of evaporative cooler and be operated in dual mode: acts as direct evaporative cooler for hot-dry and acts as regenerative indirect evaporative cooler for hot-wet seasons. The working of both modes (direct and regenerative) is explained with the help of a diagram. Effects of channels height and water flow rate on cooling capacity, wet bulb effectiveness, and dew point effectiveness are discussed. The month-wise performance of the proposed cooler is evaluated for five Indian cities (Bhopal, Lucknow and Varanasi of composite climate; Ahmedabad of hot-dry climate; Kolkata of hot-humid climate). Suitability of the modes in hot months (April to September) and cities are evaluated with the help of a psychometric chart. Study reveals that the proposed cooler can be effectively and economically used for composite climate.


Dual mode evaporative cooler Regenerative evaporative cooler Direct evaporative cooler Composite climate Cooling capacity Dew point effectiveness 



Heat transfer area (m2)


Specific heat of air (kJ kg−1 K−1)


Hydraulic diameter (m)


Binary diffusion coefficient of water vapor in air (m2 s−1)


Latent heat of evaporation (kJkg−1)


Thermal conductivity of the wicking paper (Wm−1 K−1)


Thermal conductivity of the plate (Wm−1 K−1)


Length of the channel (m)

Mass flow rate (kg s−1)


Relative humidity (%)


Temperature of air (°C)


Temperature of wetting fluid (°C)


Thickness of separating plate (m)


Thickness of wicking paper (m)


Overall heat transfer coefficient (Wm−2 K−1)


Width of the channel (m)


Height of dry channel (m)


Height of wet channel (m)

Greek letters


Convective heat transfer coefficient (Wm−2 K−1)


Mass transfer coefficient in wet channel (kg m−2 s−1)


Humidity ratio (gkg−1)


Saturation humidity at the wetting fluid temperature (gkg−1)



air in dry channel


air in wet channel


dry channel


wet channel


wetting fluid (water)


Compliance with ethical standards

Conflict of interest

There is no conflict of interest.


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringIndian Institute of Technology (B.H.U.)VaranasiIndia

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