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The comparison between C02/NH3 and C0~1234yf for optimal condensing temperature in cascade refrigeration systems

Awang, Norhazini (2011) The comparison between C02/NH3 and C0~1234yf for optimal condensing temperature in cascade refrigeration systems. Universiti Teknologi Petronas. (Unpublished)

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Abstract

Nowadays industries use C02/NH3 cascade refrigeration systems for deep cooling, down to - 50°C. Even though it is compatible with the environment, it has an adverse impact on human beings. In this work, an alternative combination of refrigerants, namely C02/R123yf, is investigated for a cascade refrigeration system which has no adverse effects, either on health or environment. This study performs a thermodynamic analysis and compares two refrigerant pairs C02/NH3 and C02/R1234yf, to determine the optimal condensing temperature of the cascadecondenser using various design parameters which are evaporating temperature, condensing temperature and intermediate temperature difference in order to maximize the COP. Theoretically, the optimal condensing temperature of the cascade-condenser increases with the condensing temperature, the evaporating temperature and the temperature difference. On the other hand, the maximum COP increases with the evaporating temperature but decreases as the condensing temperature or difference temperature increases. The comparison between C02/NH3 and C02/R 1234yf for thermodynamic analysis of optimal condensing temperature in cascade refrigeration system will give broad understanding of the safer refrigeration system.

Item Type: Final Year Project
Academic Subject : Academic Department - Mechanical Engineering - Petroleum
Subject: T Technology > TJ Mechanical engineering and machinery
Divisions: Engineering > Mechanical
Depositing User: Users 2053 not found.
Date Deposited: 09 Oct 2013 11:07
Last Modified: 25 Jan 2017 09:42
URI: http://utpedia.utp.edu.my/id/eprint/8734

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