Study of a modeling a multi-evaporator air-conditioning system

Pao Yue-kong Library Electronic Theses Database

Study of a modeling a multi-evaporator air-conditioning system

 

Author: Lei, Chi-hou Jonathan
Title: Study of a modeling a multi-evaporator air-conditioning system
Degree: M.Eng.
Year: 2010
Subject: Hong Kong Polytechnic University -- Dissertations
Air conditioning -- Design and construction.
Evaporative cooling
Department: Dept. of Building Services Engineering
Pages: xii, 80 leaves : ill. ; 31 cm.
InnoPac Record: http://library.polyu.edu.hk/record=b2356375
URI: http://theses.lib.polyu.edu.hk/handle/200/5816
Abstract: Air conditioning is a most common factor In buildings. Due to the expensive land price and the high rise buildings, a multi-evaporator air-conditioner (MEAC) has been commonly employed. The benefits are the reduction of spaces and installation cost. Moreover, although only one compressor provides the refrigerants for the whole system, MEAC can simultaneously satisfy different cooling requirements with variable refrigerant volume (VRV) technology. The modeling of MEAC is therefore needed for ensuring an accurate control system. Owing to the complication of interference between operating parameters, an assisting system and one-evaporator model was developed to simplify the modeling. Iteration was used in programming the modeling. The steady-state modeling was then developed to predict the actual phenomenon. To study the characteristics of the system, this dissertation conducted and analyzed a number of tests for the model validation. As for the control aspect, the opening of electronic expansion valve (EEV) was regulated by the respective room air temperature. This treatment results in the influence of suction pressure. Hence, the modulation of compressor speed guarantees the controlled suction pressure. Consequently, the realization of indoor unit was enhanced by the investigations. The effects on cooling capacity by other parameters were examined in different scenarios. Eventually, based on the features of interferences the intended method was verified.

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