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Proceedings 2018, 2(22), 1377; https://doi.org/10.3390/proceedings2221377

Performance of Desiccant Enhanced Evaporative Cooling System Based on High-Low Control

Faculty of Science and Technology, Technological and Higher Education Institute of Hong Kong, Hong Kong
Presented at the Economy, Sustainable Development and Energy International Conference (ESDEIC), Edinburgh, Scotland, UK, 25–27 June 2018.
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Published: 8 November 2018
PDF [431 KB, uploaded 8 November 2018]

Abstract

Desiccant enhanced evaporative cooling system is a sustainable air-conditioning (A/C) system which deals the latent load and sensible load separately by a dehumidifier and an evaporative cooler. A LDD-RIEC system consists of a liquid desiccant dehumidifier (LDD) and a regenerative indirect evaporative cooler (RIEC) were investigated. The LDD-RIEC system is characterized by low energy consumption compared with conventional mechanical cooling system, but the main shortcoming is the high dependency on ambient air conditions. To maintain stable indoor temperature, a control scheme is essential. However, very limited research work regarding control strategy can be found in open literatures. In this paper, a novel controller named high-low (H-L) control is proposed. Multi-speed technology is utilized for primary air fan and secondary air fan operating either at high speed or at low speed. The annual performance of a LDD-RIEC system is simulated in Hong Kong, a typical hot and humid region. The results indicate that H-L control is effective in maintaining stable indoor thermal comfort with temperature fluctuation from 24 °C to 27 °C for 99% of time.
Keywords: air-conditioning; liquid desiccant dehumidifier; indirect evaporative cooler; high-low control; thermal comfort air-conditioning; liquid desiccant dehumidifier; indirect evaporative cooler; high-low control; thermal comfort
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Chen, Y.; Yan, H.; Luo, Y. Performance of Desiccant Enhanced Evaporative Cooling System Based on High-Low Control. Proceedings 2018, 2, 1377.

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