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Thermal Storage Expected to Play a Major Role in Energy Saving
2017/09/23
--Continued from August Issue
 
Examples of Sensible Heat Storage
 
Sensible heat storage is most widely utilized in the field of thermal storage with the most familiar example of water heating. Here, the water used for shower or sanitary use becomes a heat storage medium.
 
There are various water heating sources such as gas, electricity, solar heat, and waste heat. Hot water made available by using any of these sources is stored in a hot water storage tank, and removed when necessary.
 
When producing hot water using a solar water heater, since hot water can be obtained during sunny daytime in greater quantities than needed, surplus hot water is stored in the storage tank where it is ready for use during hours without insolation including at night. Also, in order to produce hot water at a low energy cost by using devices such as a heat pump, a hot water storage tank is required for use in the day-time, taking into account of the time required for heating up water along with the utilization of inexpensive late-night electricity. Generally, heat pumps produce hot water using heat from the open air with inexpensive late-night electricity and the hot water generated is stored in a storage tank, then used in the daytime. Additionally, there are a large number of hybrid systems that curb electricity consumption as much as possible by combining a solar water heater and a heat pump.
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