Exergy Efficiency Evaluation And Analysis Of Indirect Evaporative Cooling In Plate Heat Exchangers

Exergy efficiency analysis is applied on indirect evaporative cooler. A cross-flow Plate heat exchanger with rectangle dividing plates is researched for indirect heat exchange and evaporative cooling. Numerical simulation is used to analyze two-dimensional flow and heat transfer processes.Based on principles of exergy analysis and calculation methods of exergy, calculation formula of exergy of moist air is described. The conversion of available energy in indirect evaporative cooling processes is analyzed and the development of exergy analysis is discussed. Six kinds of physical and mathematical model are discussed for the proposed heat exchanger. Numerical schemes are discussed in detail. The thermal performance of an indirect evaporative air cooler is analyzed numerically. The effects of a wide variety of parameters such as the velocities of the primary and the secondary air stream, the channel width, the inlet relative humidity, and the wettability of the plate on its thermal performance are investigated. The results are useful for the design of an indirect evaporative air cooler and provided theoretic evidence for exergy effectiveness and exergy efficiency ratio analysis. Evaluation methods for heat exchanger are discussed, especially for indirect evaporative air cooler. The calculation methods of exergy effectiveness and exergy efficiency ratio are researched. The effects of a wide variety of parameters such as the velocities of the primary and the secondary air stream, the channel width, the inlet relative humidity, and the wettability of the plate on exergy effectiveness and exergy efficiency ratio are simulated numerically. The results are useful for the design of an indirect evaporative air cooler.