f you are located in a southern climate and your air conditioner runs most of the year, or if your business runs an air conditioner all year to cool a kitchen, server room, or other heat load, then you will be able to use HotSpot to reduce or eliminate your hot water heating costs.
For seasonal AC/heat pump users, estimate the annual percentage of savings with the data on the cooling degree days chart.
For year round AC/heat pump users, your heat recovery savings will depend on the daily average run time of the compressor. You can determine your approximate daily BTU recovery by multiplying the tons of capacity by the hours per day, then multiply by the BTUs per ton data.
For example, a customer in Florida with average entering water temperature of 70F, with a 5 ton R410a air conditioner that runs an average of 18 hours per day year round would recover BTUs as follows:
BTU recovery per ton = 3053
Unit size = 5 tons
Hours run per day = 18
BTUs recovery per day = 274,770 BTU per day
BTUs recovered in a 30 day month = 8,243,100 BTU per month
8,243,100 BTU per month = 2417 kWh per month
If your cost per kWh is $.10, your water heating energy savings would be $ $241.70 per month or $2,900 per year.
If your cooling system running days are based only the weather, and does not run every day to cool a consistant internal heat load, you must de-rate the above savings number by the percentages found on the cooling days chart. For example, in Orlando your savings factor would be approximately 89% and annual savings would be more like $2,576 per year.
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