COMPARISON OF ENERGY LOAD BETWEEN CHILLER WATER SYSTEM AND DX SYSTEM IN HIGH-RISE HOTEL BUILDINGS

Muhammad Fadly Saleh, Nurul Inayah

Abstract


The building sector is the largest energy consumer in Indonesia. Approximately 50% of total energy is consumed by buildings. Most of the energy consumption in buildings is used to provide thermal comfort. The taller and larger the building, the more difficult it is to meet its thermal comfort needs solely through natural ventilation. Air conditioning (AC) becomes a necessity to acomodate these thermal needs in buildings. This study aims to compare the energy load of two central air conditioning systems commonly used in highrise buildings: the chiller water system and the Direct Expansion (DX) system with ducting. The DX system does not use pumps in its process. Thus, in the DX system, the energy load is reduced when using pumps. However, it is not known for certain whether the DX system is more energy-efficient overall than the chiller water system. That is why this research was conducted. The research method used was quantitative, with an experimental approach using the eQUEST computer simulation. The research object focused on one floor of a high-rise hotel in Makassar City. The research focused on the 10th floor, where most rooms served as guest rooms. The results show that the chiller water system consumes 338,020 kWh/year of energy, while the DX system consumes 366,400 kWh/year. This indicates that the chiller water system is preferred for high-rise hotels over the DX system, as it is 7.75% more energy-efficient.

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DOI: https://doi.org/10.17509/jaz.v9i1.95696

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