Combining a room air conditioner and a standalone room air dehumidifier for better indoor thermal comfort condition and higher energy efficiency

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Combining a room air conditioner and a standalone room air dehumidifier for better indoor thermal comfort condition and higher energy efficiency

 

Author: Sze, Wing-hong
Title: Combining a room air conditioner and a standalone room air dehumidifier for better indoor thermal comfort condition and higher energy efficiency
Degree: M.Eng.
Year: 2006
Subject: Hong Kong Polytechnic University -- Dissertations.
Air conditioning.
Humidifiers.
Energy conservation.
Department: Dept. of Building Services Engineering
Pages: xi, 115 leaves : ill. ; 30 cm.
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1973676
URI: http://theses.lib.polyu.edu.hk/handle/200/4461
Abstract: Since the process of cooling and dehumidification is coupled in room air conditioners (RACs), it is more challenging for the RACs to provide a better indoor thermal environment and be operated at a higher energy efficiency condition, particularly in the subtropical Hong Kong. This dissertation firstly reports on an experimental work in monitoring the indoor thermal condition and the power performances of the air conditioning in a test chamber employing either a RAC or both a RAC and a standalone room dehumidifier (DEHU) under three different operating strategies: the individual use of RAC, the combined use of a RAC and DEHU, as well as the combined use of a RAC and DEHU with an external condenser of the DEHU. This is followed by a report of a simulation study of the indoor thermal conditions and energy performances under the same three operating strategies based on the summer design day and annual basis in subtropical Hong Kong, using a building energy simulation program. The results of the experimental work and simulation study show that, under a hot and humid environment, the combined use of a RAC and DEHU could maintain a relatively lower level of indoor RH than employing a RAC only. Since the use of DEHIJ requires additional energy, this possibly increases the overall energy consumption. However, with the use of a proposed novel with an external condenser, it could not only control the indoor RH level, but could also reduce the overall energy consumption. It would appear that the DEHU with an external condenser plays an important role to effectively control the indoor RH and to enhance the energy performance of space conditioning in residences. Therefore, a novel design for a DEHU with an external condenser has been proposed.

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