Chilled Water Thermal Storage Tank Design Calculations

Chilled water is generally stored at 39 f to 42 f temperatures directly compati.

Chilled water thermal storage tank design calculations.

Successful chw tes design strategies basis of design chilled water is normally stored at 39 f to 42 f in the storage tanks since this temperature range is directly compatible with conventional chillers. Awwa d110 type 1 micah j. Chilled water thermal energy storage tank overview. Volume gallons 5 875d 2h.

Ton hour 24 618 kw hour chilled water storage system serving a hospital. 10 to 12 f chilled water systems ge n erally need a differential of at least 16 f to keep the storage tank size reason able. Both on peak and off peak electrical demands are expected to be reduced. Thermal energy chilled water or hot water is produced during periods of off peak electrical demand or usage collected in a thermal energy storage tank then withdrawn and distributed to the facility during on peak periods.

The average temperature is 48 2 f so we need to calculate the water properties at this temperature. The return temperature is between 58 f to 60 f. Chilled water tes concept tank. A difference of 20 f is the pract i cal maximum for most building cooling applications although a few systems exceed 30 f.

By optimizing the operation of the building air handling units chilled water pumps chiller plant and the thermal storage system the storage tank is better charged while chiller run time is reduced. Warm and chilled water enters and exits the tank through diffusers located at the top and bottom of the tank.