Ice Chiller Thermal Storage Unit

As the name suggests they use ice to build and store cooling when cooling demand and or energy rates are low mostly overnight which the system then uses for air conditioning or process purposes when energy rates are high mostly daytime.

Ice chiller thermal storage unit. Chiller would provide the cooling from 56 f to 45 f and the ice storage would provide the final cooling to 38 f. Ice thermal storage cooling with ice thermal storage can be the most cost effective reliable system approach to cooling offices schools hospitals malls and other buildings and provides a steady source of low temperature fluids for process cooling applications. Rouleau roman ellis 7 july 2015 chilled water tes an alternative to static ice introduction to thermal energy storage thermal energy storage tes chilled water typical storage medium water specific heat of 1 btu lb f sensible technology achieves capacity through high specific heat of water requires about 10 66 ft 3 water per ton hour at 20 degrees delta t. Ice formed overnight with cheaper electricity.

G30 unit selection ammonia g33 custom coils. Locating the chiller upstream of the ice storage allows for a higher chiller leaving set point of 45 f and better chiller efficiency. The chiller may cycle off automatically when the return temperature approaches the 45 f set. One metric ton of water one cubic metre can store 334 megajoules mj 317 000 btu of energy equivalent to 93 kwh 26 4 ton hours.

During the off peak period the glycol chiller is operational. Ice was originally obtained from mountains or cut from frozen lakes and transported to cities for use as a coolant. The glycol chilling system generates low temperature glycol that circulates through the tubes of the thermal storage coils. Typical 400 ton 1 41 mw peak office load profile 0 0 2 4 6 8 10 12 14 16 18 20 22 24 50 100 150 200 250 300 350 400 450 0 0 18 0 35 0 53 0 70 0 88 1 06 1 23 1 41 1 58 chiller size with ice time of day.

It uses standard cooling equipment plus an energy storage tank to shift all or a portion of a building s cooling needs to off peak night time hours. Thermal energy storage is like a battery for a building s air conditioning system. Easy and efficient ice thermal storage centrifugal chiller it operates the freezer at night time freezes the ice stores it in the heat storage tank and dissolves it during the daytime to provide cooling to the building. The circulating glycol removes heat from the water in the tanks causing the water to freeze onto the exterior surface of the thermal storage coils.

Since the ice is downstream of the chiller in this case the ice will cool the glycol solution from 52 f to the coil requirement of 44 f. During off peak hours ice is made and stored inside icebank energy storage tanks. How thermal energy storage works. Ice storage air conditioning is the process of using ice for thermal energy storage this is practical because of water s large heat of fusion.

Night time power operation cost is reduced and it can easilybecause it uses low cost cope with power load problem in summer.