Study on the performance of alternative controls of chilled water systems before/after intermediate heat exchangers in super-high-rise building

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Study on the performance of alternative controls of chilled water systems before/after intermediate heat exchangers in super-high-rise building

 

Author: Wang, Jingjing
Title: Study on the performance of alternative controls of chilled water systems before/after intermediate heat exchangers in super-high-rise building
Degree: M.Eng.
Year: 2011
Subject: Heat exchangers.
Refrigeration and refrigerating machinery.
Buildings -- Cooling.
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Building Services Engineering
Pages: xi, 74 leaves : ill. (chiefly col.) ; 30 cm.
InnoPac Record: http://library.polyu.edu.hk/record=b2449813
URI: http://theses.lib.polyu.edu.hk/handle/200/6248
Abstract: This study focused on the relationship between the performances of intermediate heat exchangers implied in super high rise buildings and the water flow rates in both sides of heat exchangers. Super high rise building has become a trend in the developed countries and cities, the proper chilled water systems are attracting more attention of designers and researchers. Intermediate heat exchanger is an alternative in this kind of complex system. But data and papers dealing with the performance of heat exchangers are limited. A survey conducted on the practical chilled water system in the International Commerce Centre with data provided by both heat exchanger manufactures and site testing recorded indicated that applying more heat exchangers can achieve a better heat exchange performance. This study also proposed an alternative control strategy based on more heat exchanger configuration. Also with this strategy, there is no need to use the modulating valves at the primary side and more pump energy can be saved. The widely recognized conclusion and control strategies covering all system modules and different kinds of intermediate heat exchangers should be conducted by further investigation.

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