9
454107.66.01-02_GB
01.07.2015
Translation of the Original
2.
DESCRIPTION OF THE PROCESS COOLER
The 12 kW water-/air split cooling system and the 17 kW water/air split cooling system, are
water-cooled chillers, ready for plug-in, in split-design incorporating a refrigeration circuit and
cooling water circuits including all fittings and regulating/control devices required for automatic
operation. The process cooler consists of an indoor unit with an active refrigeration circuit. The
waste heat of the refrigeration circuit and/or the CT scanner
is dissipated to the atmosphere
through an air-cooled outdoor unit.
2.1 Refrigeration Circuit
The refrigeration circuit is a closed-loop system in which the refrigerant circulates as the
working medium.
The water heated by the equipment to be cooled is recooled in the evaporator. In so doing, the
liquid refrigerant flows in a counter-flow direction with respect to the water. The refrigerant
evaporates as it absorbs heat from the cooling water heated by the equipment being cooled.
The refrigerant is now in a gaseous state and is drawn in and compressed by the compressor
(rise in pressure and temperature). The refrigerant also absorbs the heat of the compressor
motor; this heat is given off as waste heat to the cooling water circuit by the condensing unit.
The refrigerant is liquefied in the process and is passed to the inlet of the expansion valve via
the liquid receiver, the shut-off valve and the filter drier. The expansion valve permits liquid
refrigerant to enter the evaporator as a function of temperature.
The cycle is now complete.
2.2 Cooling Water Circuit
Primary Circuit
The heat produced upon cooling the water and to be given off in the evaporator, as well as the
heat of the compressor motor are absorbed by the refrigerant and given off, in the condenser, to
the cooling water circuit. The condensing pressure in the refrigeration circuit is kept constant
by means of the pressure-controlled water regulation valve in the cooling water circuit.
Secondary Circuit
The heat of the equipment to be cooled (CT scanner) is dissipated via the secondary circuit
and given off to the refrigeration circuit. The cold water temperature is kept constant at a
defined flow temperature.
2.3 Electrical / Control Equipment
The E-box is located behind the front door
on the operating side.
For the electrical connection, an all-pole disconnecting device with a contact gap width of at
least 3 mm (e.g. power contactor, mains switch, or residual current circuit-breaker, if required)
needs to be provided on-site. The technical requirements laid down by the relevant power
supply company must be adhered to.
The power ratings of the system parts are shown on the rating plates of the individual system
components. Earthing, communication and power supply cables are to be installed separately.
The wires enter the E-box from below.
2. Description of the Process Cooler
ENGLISH
