Air Cooled Chillers

Frame

The heat exchanger supporting frame consists of two side parts with integrated lifting eyes for transport by crane. The two side parts are screwed together using hollow sections in line with the DIN 10210. To prevent thermal stress, the apparatus is integrated into the frame using a fixed bearing and a floating bearing with expansion spring. Designed with thermal decoupling between the evaporator and the frame to prevent condensation build-up.

Turbo Compressor

Two-stage, low vibration radial turbo compressor with semi-hermetic design, equipped with a contact-free magnetic bearing for the shaft, with emergency system, vertically separated gas-tight housing, and aluminium impellers. The connections on the coolant side must contain shut-off fittings. This allows each compressor to be shut off from the coolant side and be maintained independently while the chiller is operating. Each compressor is decoupled with four vibration elements.

• Magnetic Bearing
• Electric Motor
• Capacity Control
• Automatic Start-up
• Protection

Evaporator

Features of construction are a horizontal shell and tube heat exchanger with internal gravitational separator. The tube bundle is protected from sagging and vibration by protective baffle plates in the tube bundle. The shell design includes water boxes (head) with front facing water connections that are removable for mechanical cleaning the bundles and water box. The evaporator is equipped with a sight glass and additional nozzles ports with shut-off valves for pressure sensors, filing and draining the heat exchanger.

Condenser

Features of construction are a horizontal shell and tube heat exchanger with internal gravitational separator. The tube bundle is protected from sagging and vibration by protective baffle plates in the tube bundle. The shell design includes water boxes (head). With front facing water connections that are removable for manually cleaning the bundles and water box. The condenser is equipped with additional nozzles ports with shut-off valves for pressure sensors, filling and draining the heat exchanger.

Expansion valve

High quality, motorised expansion valve for infinite adjustment to the refrigeration capacity requirement. The valve has a visual position display to enable monitoring of the control functions. To ensure fast restoration of the refrigeration system, the electricity drive can be removed from the valve body without opening the refrigeration circuit. When the chiller is at a standstill, the valve is closed.

Piping and valves

The refrigeration circuit is made of brazed copper and steel piping comprising suction-side and discharge-side shut-off valves for each compressor. The cooling line of each compressor contains a filter drier and a ball valve.

Insulation

All low temperature vessels and pipework receive thermal insulation. The suction line(s), evaporator and injection line receive 10-mm-thick insulation of highly flexible closed-cell foam with synthetic rubber base. This insulation is ideal for high water-vapour diffusion resistance and has a low thermal conductivity condensation. Max. ambient temperature: +40°C, relative humidity (max.) 60%.

Switch Cabinet

Switch cabinet with 1.5mm thick steel designed in protection class IP54. Sheets are electrophoretically primed and powder coated with textured polyester powder 7035. The switch cabinet is equipped with shockproof socket for connecting a programming device. Proof of a switch cabinet climate calculation designed for an ambient temperature of 40°C must be provided.