HIMA HIQuad H41X, System Manual

Page: 26 / 110

Concept for HIQuad X System
Page 26 of 110 HI 803 211 E Rev. 1.01.00
3.5 Ventilation Concept
The high integration level of electronic components causes heat loss, which also depends on
the external load of the HIQuad X system. For this reason, ensure proper ventilation within the
control cabinet. Low ambient temperature increases the product life and the reliability of the
electronic components within the system.
3.5.1 Measures for Reducing the Temperature
Low ambient temperature increases the product life and the reliability of the electronic
components within the system. To reduce the temperature within the control cabinets, HIMA's
standard control cabinets are equipped with the following components:

SK 3162 S air intake filters ensuring air supply within the control cabinet through the door.
The air intake filter should be used to prevent contaminants from entering the control
cabinets.

Air exhaust through the cut-outs on top of the control cabinet.

HIMA K 9202B cabinet fan for mounting on the top internal section of the control cabinet.

M 7200/M 7202 ventilation tray for the air duct between the individual racks.

K 9203A rack fan for forced cooling of the air from the racks.
3.5.2 Engineering Support
The power dissipation of the equipment within the cabinet is decisive for determining the fan
components. Uniform distribution of the heat load is assumed; the maximum temperature
increase is 25 °C.
The average heat dissipation of a HIMA standard cabinet achieved by convection, i.e., without
additional aids, is 300 W. This assumes installation of several cabinets next to each other and
with their rear side to the wall so that the heat can only be dissipated via the top of the cabinet.
Using a K 9202B cabinet fan, an air flow rate of 200 m³ per hour can be achieved by means of
forced cooling. The following total power dissipation has thus to be purged:
Type of standard control cabinet Power dissipation
M 1511 1000 W
M 1512 1000 W
M 1513 1000 W
M 1514 800 W
Table 2: Power Dissipation of Standard Control Cabinets
The air enters the control cabinet through the air intake filter located in the control cabinet door.
For optimal air discharge, ensure 2 RU free space at the bottom of the pivoting frame. If a
K 9203A fan rack is the lowest element being installed, only 1 RU free space is needed at the
bottom.
3.5.2.1 Installing the HIQuad X System in the Control Cabinet
When installing a HIQuad X system in the control cabinet (pivoting frame), note the following
points for the fan concept:

A K 9203A rack fan must be used above a base rack.

A maximum of 2 extension racks may be directly positioned one below the other. To install a
K 9203A rack fan, 1 RU clearance must be free between 2 successive extension rack
blocks.

From 300 W power dissipation, a roof-mounted fan must be used in the control cabinet.
The following figure shows the side view of a control cabinet with built-in components. The
figure shows the air flow course within the control cabinet and the relationship between
maximum power dissipation and fan components to be used.