Evaluation of Energy Savings by Retrofitting of the Building Envelope of Air-conditioned Row House

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Sudaporn Sudprasert


This research aims to evaluate the electric energy used and savings in air conditioning in the middle and end-unit row house. Simulation models of the middle and end-unit row houses were constructed in eQuest 3.65, an energy simulation program, to calculate the baseline energy consumption using the Bangkok meteorological data. The base case is derived from the survey of the row house in Pathum Thani Province and from the Building Control Act. This research created base case models and compared the simulated results with the electricity consumption collected from a row house. It was found that the average difference between the simulated results and the collected data was 10.2%. Therefore, the base case model can represent the energy consumption in the row house reasonably. After that, the three energy measures: 75-mm insulation, window overhang, and wall shading, were applied to the models facing to north, south, east and west. The study found that the end-unit row houses required high cooling load due to the heat conduction through wall. The electrical energy consumption for air conditioning in the end-unit house was higher than the middle house by 611-1,005 kWh per year. Installing of insulation with 75 mm. thickness in both walls and ceilings can reduce energy consumption by up to 21% compared to non-insulated ones. The payback period was 3-5 years. Shading of windows and wall moderately reduced the electrical energy for air conditioning while the investment cost was high. It was recommended to use the structure of the house, such as a balcony or eaves for shading instead of additional shading devices.


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