Abstract
A direct use approach incorporating a cost approach assumed that replacing oversized electrical appliances with those better fit to actual energy consumption can reduce energy consumption, optimizing capacities of the new appliances to the maximum while reducing electricity costs. This study aimed to verify the assumption that the size of appliances has impacts on energy consumption and cost effectiveness. A mixed-method approach included these instruments for data elicitations (i.e., a questionnaire, data records of 485 transformers, two assessments of condominium technical caretakers, and two in-depth interviews of electrical engineering experts). The findings revealed that most condominiums installed electric appliances that are too large for their actual energy usage, which lies between 5.4% and 7.1% of the capacity. This study therefore proposed a total cost reduction of 54% by downsizing these appliances (i.e., MV Switchgear 2 sets, dry type transformer 2 sets 80,000, LV Cable 10 m. (XLPE), main distribution board, Busduct (MDB-DB), generator (20% of Tr.), and generator installation). Even though this analysis is limited to Bangkok, Thailand, this case may contribute decision-making on electrical appliance selection at early stage of investment or to downsize the currently installed appliances for the more energy efficient and cost-effective management of condominiums around the world.
Highlights
Offices and residential buildings, including condominiums, in all countries around the world consume more energy and consumption is expected to grow
Like the study of [47] indicating that the energy intensity of the building sector depends on the functionality of the building, not on construction or age of the building, this present study found that the electrical functionality of the building determines the energy consumption and intensity of the building (namely MV switchgear 2 sets, dry type transformer 2 sets 80,000, LV cable 10 m. (XLPE), main distribution board, busduct (MDB-DB), generator (20% of Tr.), and generator installation)
On the profiles of condominiums and caretakers’ perspectives of electric appliances and energy consumptions, the condominium technical caretakers agreed with the suitability of electrical appliances for the condominium electrical systems
Summary
Offices and residential buildings, including condominiums, in all countries around the world consume more energy and consumption is expected to grow. In terms of economic perspectives, this energy inefficiency has led to financial losses and other undesirable management consequences. Solutions that are economically viable for enhancing energy efficiency and effective electricity consumption management of buildings, have been proposed to energy efficiency management to enhance energy-saving buildings, especially for condominiums in big cities. Demands for electricity usage in the condominiums in Bangkok, the capital of Thailand with an approximate population of 6 million residents, are expected to rise. Among the several factors of rising usage is energy inefficiency, resulting from disparities between electric appliances and actual energy consumption.
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