Abstract
This study investigated the process of existing building green retrofits through examining a Leadership in Energy and Environmental Design for Existing Building: Operations and Maintenance (LEED EBOM) Gold project. The project demonstrated a standard green retrofit process for existing buildings, which includes energy auditing, building performance simulation, and measurement and verification. In this project, four energy conservation measures were applied to improve energy performance: light-emitting diode (LED) lighting, window films, green roofs, and chilled water plant upgrading and optimization. The expected energy saving was 30% after the retrofit; while the actual energy saving was 16%. The error of building performance simulation was one of uncertainties in this retrofit project. Occupancy conditions might be the main reason for this uncertainty. Strengths, weaknesses, opportunities and threats were identified and discussed for the green retrofit. The research results could be used to optimize the existing building retrofit process for better energy performance.
Highlights
Existing buildings, especially non-residential buildings, contribute to a significant portion of greenhouse gas emissions [1]
To meet the research objective, this paper investigated a LEED EBOM project which had gone through a rigorous green retrofit process
This research described the detailed process of the retrofitting and energy conservation measurements of a LEED EBOM project
Summary
Especially non-residential buildings, contribute to a significant portion of greenhouse gas emissions [1]. The retrofitting of existing buildings usually includes enhancing efficacy of the air-conditioning system [9,10,11], upgrading the lighting system [12,13], implementing lighting controls [14,15], and improving thermal insulation of building envelopes [16] and roof systems [17]. Studies showed that these retrofits could significantly reduce energy consumptions of existing buildings and energy costs while enhance occupants’ comfort [18]
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