Energy efficiency potential assessment of lighting, ventilation, air conditioning solutions of an office building assumed to be built in 03 typical cities in different climate zones of Vietnam

Abstract

The main objective of this study is to simulate, analyze and evaluate the energy use intensity (EUI) of an office building assumed to be built in 03 typical cities in different climate zones of Vietnam: Ha Noi City (in the Northern Delta climate zone), Da Nang City (in the South Central Coast climate zone), and Ho Chi Minh City (in the Southeast climate zone) under different scenarios (baseline scenario and energy saving scenario) with the consideration of applying energy saving solutions for lighting, air conditioning and ventilation systems. For the baseline scenario, the solutions considered including: (i) lighting system using traditional fluorescent lamps; (ii) using VRF air conditioning system with the assumed coefficient of performance (COP) of 3.8; (iii) no energy recovery ventilation (ERV) system used. For the energy saving scenario, the solutions considered including: (i) replacing traditional fluorescent lamps with energy-saving LED lamps for the lighting system; (ii) using VRF air-conditioning system with the assumed COP of 5.0; (iii) using ERV system. The simulation results for energy consumption showed that when simultaneously applying all energy-saving solutions including energy-saving LED lighting system, VRF airconditioning system with COP of 5.0, and ERV system in energy saving scenario, it would have the largest energy savings compared to the baseline scenario, with 26,41%, 27,98%, and 28,70% respectively for the three construction sites of Ha Noi, Da Nang and Ho Chi Minh City. The results also indicated that the simultaneous application of highly energy-efficient VRF air conditioning system and ERV system for the office building in this study has a relatively good energy saving potential during the months with high ambient air temperatures in cities.

Key words: Office building; energy simulation; energy use intensity (EUI); lighting system; ventilation and air conditioning systems.