Chilled Water Thermal Storage Tank Design Calculations

The flow rate of chilled water into the evaporator is measured as 12 649ft3 h and the chilled water inlet temperature is 53 6 f the outlet temperature is 42 8 f.

Chilled water thermal storage tank design calculations.

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water is produced during periods of off peak electrical demand or usage collected in a thermal energy storage tank then withdrawn and distributed to the facility during on peak periods. Volume gallons 5 875d 2h. Awwa d110 type 1 micah j. 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.

A difference of 20 f is the pract i cal maximum for most building cooling applications although a few systems exceed 30 f. Warm and chilled water enters and exits the tank through diffusers located at the top and bottom of the tank. The return temperature is between 58 f to 60 f. Design diffuser tank building advantages.

Chilled water is generally stored at 39 f to 42 f temperatures directly compati. The average temperature is 48 2 f so we need to calculate the water properties at this temperature. Both on peak and off peak electrical demands are expected to be reduced. 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.

Design of chilled water storage systems stratified storage tanks estimating tank geometry tall slender tanks are preferred to optimize thermocline and minimize footprint where practical tank height should be greater than highest air vent in chilled water lines prevents drainback quick formula for tank sizing. Ton hour 24 618 kw hour chilled water storage system serving a hospital.