The effects of impaired condenser heat rejection on operational performance for air cooled refrigeration units

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The effects of impaired condenser heat rejection on operational performance for air cooled refrigeration units

 

Author: Yeung, Kwok-hei
Title: The effects of impaired condenser heat rejection on operational performance for air cooled refrigeration units
Degree: M.Eng.
Year: 2005
Subject: Hong Kong Polytechnic University -- Dissertations
Refrigeration and refrigerating machinery
Air conditioning -- Efficiency
Department: Dept. of Building Services Engineering
Pages: xiv, 114 leaves : ill. (some col.) ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1810033
URI: http://theses.lib.polyu.edu.hk/handle/200/3931
Abstract: DX air conditioners have been widely used for domestic air-conditioning for many years in Hong Kong because of their low equipment cost and installation cost. Split-type air conditioners have recently also become increasingly common in commercial buildings, office buildings and institution establishments. However, due to the lack of space and then need to maintain a neat appearance, problems relating to the positioning outdoor units for DX are commonly found in Hong Kong. This dissertation presents an empirical approach to investigating and modelling the condensation process in refrigeration systems. The major focus is in the impacts of impaired condenser heat rejection on the operational performance of these units and the development of installation guides to provide a reference for positioning condensing units for higher operating efficiency and comfortable indoor environment. Mathematical modelling and carrying out experiments were the approaches employed. Mathematical models were developed based on existing theories of condensation process. At the same time, experiments under different condenser inlet air conditions were carried out. The purpose of the experiments was to verify the accuracy and validity of the models under different condenser inlet air conditions. One major contribution of this dissertation is that an installation guide for positioning condensing units of DX air conditioners has been developed. It is believed that the installation guide provides guidelines to DX air conditioners' installation technicians to positioning outdoor units avoid such as high condenser inlet air temperature and insufficient condenser inlet air flow rate. Besides, the proper sizing for a DX air conditioning system is also considered in the guide to ensure proper indoor space conditioning, equipment performance, and economical operation.

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