Thermal Energy Storage System

Chilled Water Thermal Energy Storage (CW TES) System

What is Chilled Water TES System

Chilled water thermal energy storage system utilizes off-peak electricity, which is usually cheaper than on-peak, electricity to cool off water. The system utilizes only the sensible heat of water for cooling energy storage in a chilled water storage tank and discharges the stored coldness for air-conditioning in on-peak time. This operation scheme will reduce the total energy consumption and operation cost.

Chilled Water TES System

CW TES has long history of installation and widely applied around world including U.S.A., Japan, Korea and Middle East Asia.

Features of CW TES System
  • Lowest initial investment cost.
  • Simple system without additional heat exchangers and less equipment.
  • 30% energy saving by utilizing conventional chillers whose efficiency is higher than low-temperature chillers.
  • Easy to convert conventional system into CW TES system by adding only chilled water storage tank.
  • Convertible to heating purposes.
  • Environmentally friendly system free from brine.
  • Storage water can be utilized as a fire-fighting source.
  • Requires larger installation area and storage volume compared with Ice Storage System.

FT Energy CW TES System

Stratification in CW TES
Stratification in CW TES
Key Technology of CW TES

The key technology of CW TES system is the diffuser design which ensures thermal stratification of chilled water and warm water by density difference. FT Energy`s Technology is the state-of-the-art technology which is recommended at ASHRAE's design guideline.

Key Technology of CW TES
Key Technology of CW TES
Certificate of FT Energy
Certificate of FT Energy

ISO 9001

Certificate of FT Energy

ISO 14001

Certificate of FT Energy

IGSHPA Member (Oklahoma State University)

Certificate of FT Energy

Certificate of Patent

Certificate of FT Energy

Certificate of Patent

Certificate of FT Energy

Registration of Patent

Certificate of FT Energy

IDEA Certificate

Certificate of FT Energy

Certificate of Patent

Certificate of FT Energy

Certificate of Patent

Data Center

Uninterruptible Chilled Water Supply (UCS) Tank for Data Center

Executive Summary

FT Energy implemented an Uninterruptible Chilled Water Supply (UCS) tank that enabled a high density data center to survive a power outage without costly thermal damage to servers. The system, based on auxiliary chilled water storage tanks, kept the data center cool when an outage caused the chillers to shut down.

Why is this system important to data center

In data centers with high power and heat densities, a power sag or outage can cause rapid temperature increases. This is because cooling systems temporarily shut down, while servers keep producing heat because they are on an uninterruptible power supply (UPS).

To overcome this problem, FT Energy implemented an Uninterruptible Chilled Water Supply Tank(UCS) at a large regional hub data center. The system, based on pressurized tanks containing chilled water operated successfully during an outage that lasted several hours.

FT Energy’s Advantage and Technology
  • Optimized design for peak flow and storage capacity.
  • Flexible back up time adjustment design.
  • Design and manufacture of pressure tank according to ASME code.

When the chillers stopped working, the system added water from the tanks to the chilled water system to maintain cool data center temperatures.
Chilled water system pumps and air handler fans continued operating because they were on UPS and generator backup power.
Servers continued to operate for more than 15 minutes due to the light load on the data center at the time of the utility power outage.
The thermal reserve maintained cooling during this period and for long enough afterwards to allow dissipation of residual heat from the servers.

CFD Vertical type

Vertical type

CFD Horizontal type

Horizontal type

Uninterruptible Chilled Water Supply 2 way Valve for Data Center (UCS 2way V/V)

  • Recovery function using hydraulic pressure in case of power failure
  • Water hammering prevention function
  • Opening / Closing speed adjustable (30s ~ 120s)
  • Remote monitoring/management function (RS 485,Open protocol)
  • Anti-seize function, Self-checking function
Product Picture
CFD Horizontal type
  • Specification
    Pressure KS 10k/20k/40k Power AC 24 / AC 220V
    Signal 4~20 mA
    Temperature -20 ℃ ~ 220 ℃ Speed 0.44mm/s & 0.8mm/s
    Speed control Bidirectional speed control
    Flow Media Water, Oil, Gas, Steam Duty Rating 100%
    Operating type Single / Double acting
    Assembly Separation/Combination method
    Applied Type Globe, Butterfly Local Switch Auto/Manual and


Insulation & Waterproofing


Polyurethane Foam
  • Properties

    Is a two-component, light weight, energy efficient insulation system that can be utilized in the form of prefabricated rigid board stock, spray pour of froth applied, depending on design and product requirements

  • Structure

    The proper ratio of these raw materials cross linked together, provide an insulating material with a high strength to weight ratio, good thermal stability, low thermal conductivity with excellent adhesion to most substrate materials.
    Since rigid polyurethane foam is 90 to 95% closed fine cell, it provides the lowest “K” and highest “R” factor, commercially available.
    These advantages make polyurethane foam the most energy efficient and cost effective insulation material currently available.

  • Injection Method

    Unlike the spray method, FT Energy uses the injection method to insulate. The advantages of the injection type compared to the general spray method are as follows.

    1. Insulation foam of a certain thickness can be made.
    2. Unlike the spray method, it does not pollute the surrounding environment. So it is easy to work in the city center.
    3. The spray method requires finishing work, but the injection method is not necessary.
    4. The amount of foam used is less than spray.
    5. The spray method requires a technician with long experience, but the injection method can also be done by a technician with intermediate experience.
Advantages of Polyurethane Foam

The best insulation efficient polyurethane foam is composed of independent closed cells filled with freon gas, thus, has lowest thermal conductivity among various other insulating materials which are being used for cold storage facilities.

  • Properties of Polyurethane Foam
    DENSITY (g/cm3) 0.025 ~ 0.050
    THERMAL CONDUCTIVITY (Kcal/mh℃) 0.018 ~ 0.021
    COMPRESSIVE STRENGTH (Kg/cm2) 1.5 ~ 4.5
    SERVICE TEMPERATURE (℃) -170 ~ 100
    WATER ABSORPTION (%) Less than 3%
    CLOSED CELL CONTESTS (%) 90 ~ 95

Tank bottom insulation

Tank Ceiling insulation

Tank Wall insulation


Description of Polyurea
  • Reaction of isocyanate with primary amine terminated polyethers
  • Processed commercially available high pressure
  • High temperature impingement mix spray equipment
  • A two-component spray elastomeric and coating system, one component being the isocyanate quasi prepolymer and the other component being the resin blend
  • Fast reactivity and cure
  • No catalysts
  • Relative water insensitivity
  • Ambient temperature insensitivity
  • Two component, 100% solid
  • Wide formulation flexibility aromatic and aliphatic system
  • Excellent physical properties
  • High thermal stability, mainly aromatic systems
  • Reinforcement incorporation
  • Easily pigmented
  • Ease of application, spray, pour or rim

Tank bottom waterproofing

Tank Ceiling waterproofing

Tank Wall waterproofing

Heat Exchanger

Plate Heat Exchanger


Plate Heat Exchanger(PHE) consists of corrugated thin heat plates, seal gaskets, top & bottom bar, frame and etc. The heat plates have high heat transfer coefficients by turbulent flow of the channel band. The gaskets forms the flow path of the primary and secondary fluids as well as sealing.

  • High Efficiency
  • Versatility of Duty
  • Compact
  • Economical in Cost
  • Easy Maintenance
  • Capacity Adaptability
Standard Specification
  • Plate Material
    STS304, STS316, STS316L, SMO254, SLX904, Titanium, Titanium-Palladium, Nickel, Nickel Alloy, Hastelloy-C, Hastelloy-B, Etc.
  • Gasket Material
    NBR, EPDM, HNBR, Viton, Teflon, Silicon
  • Max. Design Pressure
  • Max. Design Temperature
    -30℃ ~ 210℃
  • HVAC
  • HTST & UHT
  • Heat Recovery System
  • Iron & Steel Industry
  • Chemical Industry
  • Central Cooling with Sea Water
  • Shipbuilding Industry
  • Evaporator & Condenser in Chiller and Heat Pump

Standard Dimension

Standard Dimension
Model AREA m2 Standard Nozzle Size MAX Flow m3/hr SIZE mm
TX05 0.0152 3/4” (20A) 4 128 270 70 ~ 320
TX07 0.034 1 1/2” (40A) 12 192 466 330 ~ 510
TX3 GD 0.09 2 1/2” (65A) 50 346 775 517 ~ 1680
AN 0.17 1145
AX 0.25 1515
TX4 GD 0.101 4” (100A) 120 495 874 780 ~ 1780
AP 0.228 1151
AN 0.348 1428
AX 0.467 1705
TX8 GD 0.37 8” (200A) 550 740 1459 1390 ~ 1780
AN 0.68 1944
TX9 GD 0.27 8” (200A) 550 740 1297 1150 ~ 2770
AP 0.47 1620
AN 0.68 1944
AX 0.89 2267
TX14 GD 0.84 12” (300A) 1200 1012 1922 1360 ~ 5060
AP 1.28 2338
AN 1.62 2754
TX16 AN 3.06 18” (450A) 2600 1400 3966 2130 ~ 5030
TX20 GD 1.08 20” (500A) 3500 1420 2488 2130 ~ 5030
AP 2.07 3226
PLATE MATERIAL Stainless Steel, SMO254, SLX904, Titanium, Titanium-Paladium, Nickel, Nickel alloy, Hastelloy-B, Hastelloy-C
GASKET MATERIAL NBR, EPDM, CR, Butyl, Viton, Teflon R, Silicon, Reflon R
FRAME MATERIAL Carbon Steel, Stainless Steel, Stainless Steel Lining

Contact Us

FT Ener

  • KOREA OFFICE55, Hanyangdaehak-ro, Sangnok-gu, Ansan-si, Gyeonggi-do, Korea
  • KOREA FACTORYNo 408, 55, Hanyangdaehak-ro, Sangnok-Gu, Ansan-si, Gyeongi-do, Korea
  • PHILIPPINES OFFICE65D Pres. Roxas St. Kasambagan, 6000, Cebu city, CEBU, Philippines.
  • U.A.E OFFICEP.O.Box 17588. #1301, 13F, Jafza Views 18, Jebel Ali Freezone, Dubai
  • Tel+82 10 8271 8170
  • E-mail /