Study on indirect evaporative energy recovery from an air-conditioning system of a wet market

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Study on indirect evaporative energy recovery from an air-conditioning system of a wet market


Author: Zhang, Haocan
Title: Study on indirect evaporative energy recovery from an air-conditioning system of a wet market
Degree: M.Eng.
Year: 2014
Subject: Air conditioning -- Energy conservation.
Markets -- China -- Hong Kong
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Building Services Engineering
Pages: viii, 77 leaves : illustrations ; 30 cm
Language: English
Abstract: With the fast urbanization process of the society, energy saving, especially building energy savings, tends to become an urgent affair under the circumstance of energy shortage. Property owners and engineers have concerned more about energy recovery from air conditioning systems since space cooling consumes more energy than other systems in this subtropical area. A wet market in Hong Kong, with high level of humidity and all fresh air supply, is a great potential area for energy recovery. As an advanced energy saving technology, the Indirect Evaporative Energy Recovery (IEER) has popped up in the last few decades. This dissertation aims to evaluate the performance of the IEER system, such as its feasibility, economics, and environmental friendliness, for its application in a new wet market. A case study of the IEER system used in a wet market under construction at Tung Chung Area 56 in Hong Kong is carried out. For the purpose of evaluation, the performance of the IEER system is analyzed based on the software simulation and calculation equations. Meanwhile, various energy saving methods applied to the IEER system for energy saving are studied. System feasibility is analyzed. By comparing the performance of the IEER system with a wheel heat recovery (WHR) system and an evaporative cooling (EC) system, the better one can be chosen in future air conditioning system design for local wet markets. In addition, the energy saving, cost saving, and CO2 emission are also presented. The simulation and calculation results indicate that the IEER system, theoretically, can save up to 585320kWh per year, and the money saving is about HK$113,000 per year. About 118.2 tons' decrease of CO₂emission and 3.8 tons of SO₂can be achieved. At the end, an optimum design concept was proposed to engineers for optimization of the system operation performance; recommendations were made for future similar projects and future research; and some proposals were offered to the decision-makers for a more efficient system design.

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