Supermarket energy consumption is substantial and the major chains have been looking for reductions closely in the last 20 years.
Walmart incorporated desiccant systems substantially to reduce humidity, condensation, and ice in the refrigeration display cases.
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Savings include
‣ Reduced the power consumption by 10% of all the cases for every 10% reduction in humidity (Note: efficiency average on a typical mixture of case type).
‣ Reduce defrosts to melt the ice (often the cause of poor ice cream quality)
Avoid strip heaters to stop display condensation.
‣ Reduced electric reheat as conventional air conditioning would over-cool the air to 12C or lower and then reheat sometimes with 200kW of electric heat to get the store below 60%rh to try to avoid ice issues.
Desiccant dehumidifiers avoid this by using waste heat from site refrigeration and onboard compressors to provide free dehumidification capacity to maintain 45%rh in the store around the cases.
DST Dryer has delivered over 100 of these in Australian supermarkets, specifically customized for local building configuration, some are easy to install on the roof, sometimes more challenging like West-HVAC installation in the basement the latest is Sydney installation.
If you have a humidity problem or need to look into energy savings contact DST.