Automatic Mild Steel 150 TR Continuous Cooling Solution

TECHNICAL SPECIFICATION

FIDEM – WATER COOLED SCREW TYPE CHILLER (150 TR)

The proposed equipment consists of a FIDEM manufactured water-cooled screw type chiller, designated by model FM-WCS-150-407C, and designed to provide a nominal refrigeration duty of 150 TR, corresponding to approximately 527 kW of net cooling capacity. The chiller package is configured with two (2) completely independent refrigerant circuits, ensuring improved system reliability, operational redundancy, and uniform load sharing between compressors. The unit is intended for operation on a three-phase, 415 V, 50 Hz AC power supply, with a maximum connected electrical demand of 112.1 kW and a full-load current rating of 204.8 A. The refrigeration cycle utilizes R-407C refrigerant, and precise refrigerant flow management is accomplished by means of an Electronic Expansion Valve (EEV), ensuring stable, responsive, and efficient system performance.

Evaporator – Shell & Tube Type

The chiller is fitted with a water-cooled shell and tube type evaporator, designed for an evaporating saturation temperature (SST) of 10 °C. The system is suitable for applications requiring a chilled water operating temperature range of 15 °C to 20 °C. The evaporator assembly comprises two (2) refrigerant circuits and is designed to accommodate a chilled water flow rate of 19,700 LPH, corresponding to a temperature differential of approximately 23 °C, thereby delivering a cooling capacity of 527 kW.

The evaporator shell is fabricated from carbon steel with a minimum wall thickness of 10 mm using seamless construction, providing high mechanical strength and long service life. Heat transfer is achieved through internally grooved copper tubes arranged in a U-bundle configuration, which enhances thermal efficiency. The evaporator is equipped with 6-inch water inlet and outlet connections and is designed for a water-side pressure loss of 0.4 bar. The maximum allowable working pressure on the water side is 10 bar, while the refrigerant side is designed for a pressure rating of 25 bar.

Circulation of chilled water through the evaporator is ensured by a centrifugal mono-block pump, rated for 90,000 LPH at a total dynamic head of 15 meters, and driven by a 5.5 kW electric motor.

Condenser – Water Cooled Shell & Tube Type

The condenser is a water-cooled shell and tube type heat exchanger, designed to operate at a condensing saturation temperature (SDT) of +35 °C. The condenser is capable of rejecting a total heat load of 718 kW. The shell is manufactured from carbon steel and protected with an epoxy coating to provide effective corrosion resistance, while the heat transfer surface consists of plain copper tubes arranged in a tube bundle configuration.

The condenser is provided with 6-inch cooling water connections and is designed for a cooling water flow requirement of 140,000 LPH. The pressure drop on the water side is limited to 0.4 bar, with a water-side design pressure of 10 bar. The refrigerant-side design pressure is rated at 30 bar.

Cooling water circulation for the condenser is achieved by means of a centrifugal mono-block pump, rated for 110,000 LPH at a head of 10 meters, driven by a 5.5 kW motor suitable for operation on 380–415 V, 50 Hz power supply.

Compressor – Screw Type

 

The chiller is equipped with a compact screw type compressor, designed to deliver a cooling output of approximately 550 kW. The compressor is suitable for continuous operation at full load (100%) and supports step or stepless capacity modulation at 25%, 50%, 75%, and 100%, enabling efficient matching of system capacity with varying cooling demand. The compressor is provided with a star-delta starting arrangement, with Variable Frequency Drive (VFD) control available as an optional provision. The compressor electrical power input shall be as per system design and actual operating conditions.