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 syste and the 17 kW water/air split cooling syste , 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 auto atic
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 at osphere
through an air-cooled outdoor unit.
2.1 Refrigeration Circuit
The refrigeration circuit is a closed-loop syste in which the refrigerant circulates as the
working ediu .
The water heated by the equip ent 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 fro the cooling water heated by the equip ent being cooled.
The refrigerant is now in a gaseous state and is drawn in and co pressed by the co pressor
(rise in pressure and te perature). The refrigerant also absorbs the heat of the co pressor
otor; 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 per its liquid
refrigerant to enter the evaporator as a function of te perature.
The cycle is now co plete.
2.2 Cooling Water Circuit
Pri ary Circuit
The heat produced upon cooling the water and to be given off in the evaporator, as well as the
heat of the co pressor otor 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 eans of the pressure-controlled water regulation valve in the cooling water circuit.
Secondary Circuit
The heat of the equip ent to be cooled (CT scanner) is dissipated via the secondary circuit
and given off to the refrigeration circuit. The cold water te perature is kept constant at a
defined flow te perature.
2.3 Electrical / Control Equip ent
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 (e.g. power contactor, ains switch, or residual current circuit-breaker, if required)
needs to be provided on-site. The technical require ents laid down by the relevant power
supply co pany ust be adhered to.
The power ratings of the syste parts are shown on the rating plates of the individual syste
co ponents. Earthing, co unication and power supply cables are to be installed separately.
The wires enter the E-box fro below.
2. Description of the Process Cooler
ENGLISH
