Centralized Air Condition System’s Coefficient Of Performance And Relations With Energy Usage At Laman Hikmah Library UTeM

Arumugam, Thineswary (2020) Centralized Air Condition System’s Coefficient Of Performance And Relations With Energy Usage At Laman Hikmah Library UTeM. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

The sole purpose of this thesis is to conduct an analysis regarding the centralized air conditioning system’s coefficient of performance (COP) in relation with energy usage at Laman Hikmah UTeM. Laman Hikmah is one of the leading building in energy consumption at UTeM. The use and energy production has a huge impact on the climate and climate change will affect our capacity for generating energy and our demands for energy. Air conditioning system in Laman Hikmah is dramatically increasing day by day. Thus, it is particularly important to understand the detailed energy consumption structure in that building, focusing especially on air conditioning usage. Library UTeM was established as a new building at the main Campus, Durian Tunggal on 8 July 2009. It started its operation on 29 September 2009. The Library Gross Floor Area (GFA) is 14,503.64 m2, Net Floor Area (NFA) is 7977.00 m2 (55% from GFA) and the Air Conditioning Area (ACA) is 13,053.28 m2 (90% from GFA) could provide a seating capacity of 500 users at any one time. This library have 66 staffs. The building main energy supply are in the form of electricity from TNB (100%) with C1 tariff. The annual electricity consumption for August 2014 until July 2015 was 1,374,110 kWh. Two chillers operate during the audit process with the COP is 4.4 respectively. Other heat rejection device is cooling tower (CT). Based on overall energy consumption baseline (July 2014-June 2015), it was discover that Laman Hikmah consumed total of 8% of energy from UTeM. Then chiller of Laman Hikmah itself consume about 50% energy compare to other energy sources of the library. In an order to find out the coefficient of performance of chiller, some data was measured and analyzed such as Chiller Water Supply (CHWS) temperature, Chiller Water Return (CHWR) temperature, flowrate, and power consumption of the chiller. The overall energy consumption data of Laman Hikmah was gathered via available Internet of Things (IoT) energy management tools and compared with the manually gathered and also with the projected baseline data. A statistical regression analysis is then used to analyze the relation between the COP and energy consumption. Finally, the analyzed data is visualized in a graphical form to be further discussed. As a result, it was noticed that there is a relationship between COP and energy consumption. Then the collected data was compared using ASHRAE table and noticed that the system’s performance is in a good state. Analysis result also shows that, as the Coefficient of Performance increases, the energy consumption decreases and well as the cost of electricity. This also have been proven in this thesis whereby, the highest power consumption by the chiller is 117.62kW with the lowest COP of 3.67, and the lowest power consumption by the chiller is 92.88kW with the highest COP of 5.55. It is essential to carryout energy audit and calculate the COP in an order to find out the chiller’s performance.

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