Thermal comfort is normally the main reason of having an air conditioning system for a building. Other purposes include air circulation or ventilation, air purifying and dehumidifying or humidifying. An air conditioning system will consume energy and for a building in a hot and humid climate like Malaysia, the energy consumption takes up very high percentage relative to the overall energy usage.
A TES unit
generally consists of a heat exchanger system of helical coils (metal or
plastic) placed inside an insulated storage tank, a refrigerant tank, a
refrigerant pump, and an air-cooled condensing unit. Being well insulated, these
storage tanks (ice cell) can normally be located anywhere, either indoors or
outdoors.
TES system is designed to work
with the existing building’s cooling system (a chiller), which chills either
water or an ethylene glycol solution for the heat-exchange air conditioning of
the building. The system simply uses the chiller to make ice or chilled water
during off-peak hours and stores it in the insulated storage tank.
Figure 1: Schematic diagram for TES system
Figure 1 shows the diagram of the plant where AHU is air handling unit, FCU is fan coil unit,
CT is cooling tower, PHX is primary heat exchanger and SHX is secondary heat
exchanger.
Written By:
ABDUL HAFIZ BIN KASSIM
AHMAD IZZAT BIN MOD ARIFIN
MOHD SAIFUL NAJIB BIN ISMAIL@MARZUKI
reviewed by Nur Idawati
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