Water TES, Ice Tes

1. Name: Putika Ashfar Khoiri
Student Number: 28J16118
The Usage of Thermal Energy Storage (TES) in Building
There are various using for TES in building for air conditioning, disaster resistant and other various
usage. In this present time, water TES has been developing since 60 years ago in Japan and now the
technology reaches its high performance. The other technology for are Ice TES and phase change
material (PCM) test for space cooling are still under research. Nakanoshima 2, Osaka Festival Tower
is using TES for its cooling and heating system. District heating and cooling (DHC) are installed on the
basement to support the offices, companies and other facilities in this complex building. It has no
cooling tower, therefore the Dojima River supply water as heat source for cooling and heating. The
turbo chiller converts the water onto chilled water and send it to the building. The water dispose to
the chilled water tank. The heat exchanger is used to produce warm water to supply to the building.
It considers energy saving system for special case. The Tosabori river receive the dispose water from
the supply system. Warm water charge, discharge and also chilled water charge and discharge are also
being considered when design the diffuser and piping in TES tank. The CFO analysis was conducted
for studying the effect on temperature profile in change of flow rate into tank in the limit of time.
Fig 1. View of Dojima River in Nakanoshima (up-left), inside the Nakanoshima Osaka Festival Tower
(down-left, right)
The other example of TES technology is applied on Head Office of Kansai Electric Power Company in
Nakanoshima. They are using Ice TES for the district cooling plant. Slurry ice is made by screw heat
pumps settled on the basement floor of head office building. The rotating bridge are used to get the
raw ice. The machine room consists of ice maker machine and ice tank for cooling system in the

2. building. Basically both ice TES and water TES in Nakanoshima building are using river water as a heat
source for space cooling and heating.
The Nakanoshima building have efficient equipment’s called heat pump that can be used in space
cooling and heating similar to the air conditioning. This type of heat pump release heat as sensible
heat from outdoor machine in lower cost and can be used for cooling and heating. The building has
no cooling tower which usually collected heat from room and obtains heat through chiller and its
temperature rises.
The most interest fact is the ice TES system can be used to reduce the energy consumption for air
conditioning system in the building. Thermal energy storage is like a battery for a building’s air-
conditioning system. 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. During off-peak hours, ice is made and stored inside
the storage tanks. Because the energy consumption for cooling system is becoming large recently. So
we have to design building s of lower cooling and heating for energy saving. Especially in summer,
energy used in chiller, fan and pump is so huge. It is necessary to have efficient technology with high
efficiency and low cost.