Heat pumps are a great way to use the power (and heat) of thermodynamics to move heat from a cold space to a hot space. Their Coefficient of Performance (COP) makes them a better option than fossil fuels in some climates. Renewable energy like solar, can also reduce the carbon footprint. However, the biggest problem is that peak heating needs for homes usually occur just before the sun rises.
Scientists in Norway and Switzerland have developed a small-scale energy storage system designed for homes that allows a heat pump to pre-charge a thermal storage reservoir. The reservoir stores heat using salt hydrates that turn from liquid to solid when cooled. The reservoir is charged during the day when solar (and cheaper energy) is available, and used at night when needed, to improve the COP of the heat pump. The system is smaller than a typical water heater and uses inexpensive components.
So, the next time you reach for salt for your fries, remember that it could also help make your home’s heating system more efficient. – Steve Terry, DTC HVAC & Refrigeration Instructor
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