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In contrast, existing evaporative cooling methods can only cool an air to around its wet-bulb temperature. However, the modification in an indirect evaporative cooler has enabled to obtain a temperature below its wet bulb temperature, and towards its dew point temperature. Two types of heat and mass exchangers HMXes are under extensive research for air conditioning applications specifically based on M-Cycle applications, namely, counter and cross-flow HMXes.
In this research paper, a comparative performance study of both heat exchangers is presented based on their cooling effectiveness, Coefficient of Performance COP , and cooling capacity.
For both types of HMX, balances of mass, momentum and energy are computed. The resulting coupled ordinary differential equations with coupled boundary conditions are discretized using first order accurate finite difference numerical formulation. The governing equations are simulated using purposely developed code. Validation is obtained by comparing the predicted results with experimental studies of HMX in both flow configurations.
Results are presented by varying ambient temperature, humidity, and flow rate. It is concluded that a cross flow HMX is more viable for commercial use because of its ease of construction and higher COP values, whereas, a counter flow HMX offers more cooling effectiveness.
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The Maisotsenko Cooling cycle combines the thermodynamic processes of heat exchange and evaporative cooling in a unique indirect evaporative cooler resulting in product temperatures that approach the dew point temperature not the wet bulb temperature of the working gas. This cycle utilizes the enthalpy difference of a gas, such as air, at its dew point temperature and the same gas saturated at a higher temperature. This enthalpy difference or potential energy is used to reject the heat from the product. Consider the cooling gas to be air and the liquid to be water; the Maisotsenko Cycle allows the product fluid to be cooled in temperature ideally to the dew point temperature of the incoming air. This is due to the precooling of the air before passing it into the heat-rejection stream where water is evaporated. For purposes of this paper, the product fluid is air.
International Journal of Energy for a Clean Environment
As the access to this document is restricted, you may want to search for a different version of it. Mei, L. Maisotsenko, Xuan, Y. Abdulateef, J. Tyagi, S.
Maisotsenko cycle: technology overview and energy-saving potential in cooling systems
Overview of the Maisotsenko cycle – A way towards dew point evaporative cooling