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主页 旧刊 有关人员 未来大会 American Society of Thermal and Fluids Engineering

ISSN Online: 2379-1748

ISBN Flash Drive: 978-1-56700-472-4

ISBN Online: 978-1-56700-471-7

3rd Thermal and Fluids Engineering Conference (TFEC)
March, 4–7, 2018, Fort Lauderdale, FL, USA

AN ANALYTICAL MODEL FOR HEAT AND MASS TRANSFER PROCESSES IN NEW HYBRID INDIRECT/DIRECT EVAPORATIVE COOLER CONCEPT WITH PARALLEL FLOW CONFIGURATION

Get access pages 1449-1464
DOI: 10.1615/TFEC2018.che.021866

摘要

Evaporative coolers utilize the evaporation of water to cool air. The advantage is to use only a fraction of the energy of typical compressor-based cooling systems. The objective of the current investigation is to introduce an effective small system dealing only with primary flow in which the indirect and direct processes exist in the same channel. This innovative system provides an appropriate alternative to mechanical vapor compression systems for dry climate regions. The importance of such a system is not limited to energy saving and environmental safety but can also effectively handle the bacteria source, maintenance, and cleaning. Moreover, eliminating the dependency on a secondary flow will either increase the air supply flow rate by increasing primary air flow channels or reducing the evaporation size. An analytical model is developed for the coupled heat and mass transfer processes in a hybrid (indirect and direct) evaporative cooler. The model considers the flow and channel wall temperature, which fluctuates in the indirect (dry) section and in the direct (wet) section. Diffusion mass transfer of water vapor and relative humidity variation within the channel are considered and combined with convection heat transfer equations to predict the flow effect. However, the effects of changing the operation conditions and channel wall thickness were taken into account during the prediction of the system's performance. Comparative results show that the hybrid concept has a great potential in the future of evaporative cooler system.
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