Reducing energy consumption in grocery stores: Evaluation of energy efficiency measures
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This paper describes a portion of a study which investigated the reduction of energy consumption in grocery stores in a hot and humid climate. The first part of the study investigated the maximum possible savings that can be obtained by implementing energy efficiency measures (EEMs) in a grocery store. The second part of the study took a step further and examined the option of combined heat and power (CHP) technologies to further reduce the energy consumption of the grocery store. In this paper, several energy efficiency measures (EEMs) for the grocery store were examined to reduce the overall energy consumption of the store. A calibrated whole-building energy simulation model was used to carry out this analysis. The EEMs were organized into four categories, which include measures for the envelope; lighting and daylighting; heating, ventilation, and air conditioning (HVAC); service hot water (SHW) systems; and refrigeration systems. Only certain measures were selected under each category depending on the simulation capabilities of the whole-building simulation program selected for the analysis. The measures were first assessed individually and then combined to provide a cumulative energy savings based on each category. Savings were assessed in terms of both site and source energy consumption. EEMs for the building envelope were found to be least effective of all the measures considered by this study. Savings for site energy consumption in this category were in the range of-03% to 3.1% and for source energy consumption were in the range of-0.20% to 2.3%. Savings for site energy consumption on implementing EEMs for lighting and daylighting were in the range of 4.3%) to 5.4% and for source energy consumption were in the range of 7.5% to 9.7%. Savings from implementing EEMs for the HVAC systems for site energy consumption were in the range of 0.2% to 12.1% and for source energy consumption were in the range of 0.1% to 4.9%. Savings from implementing EEMs for refrigeration systems for site energy consumption were in the range of 0.1% to 16.9% and for source energy consumption were in the range of 0.1% to 9.2%. Selected measures when grouped together provided site energy savings of 57.9% and source energy savings of 55.8%). 2014 ASHRAE.
