The framework of the ACS cabinet is composed of robust distortion proof hollow alu extrusures.

The extrusures are fitted with symmetrical fixing runners for the fitting of sliding nuts, giving a wide and varied construction range. The bridth and depth connections over various levels provide a universal construction range. The cabinet has a closed top and bottom (inner circulation). The doors, side-and back panels,

are all double panelled. Added strengthened extrusures ensures a high mechanical stability.

Finishing treatment

This treatment procedure is necessary on aluminium used outside and guarantees long term weather protection.

Testing

The ACS complies and certifies to : EN 50298 RF Shielding provided to EN 61000 Earthquake, shock, vibration, transportation ETS 300019 IP 55 dust and waterproof to EN 60529

Principio di funzionamento

Thermal physical characteristics of air

Air is a mixture of gases, which have physical thermal characteristics that change due to pressure, temperature and humidity.

An air density of 20 % with 50 % relative humidity, is equivalent to 1,2 kg/m 3 , in other words, 1 m³ of air weighs 1,2 kg.

The pressure in a normal working area can then be considered as a constant value.

The specific heat capacity of dry air at -40 °C is equivalent to 0,238 kcal/kg °C, and at 60 °C to 0,244 kcal/kg °C.

The constant value of 0,244 kcal/kg °C. The constant value of 0,24 kcal/kg °C applies also to humid air.

In other words (in practice it can be said), to heat or cool 1 kg of air in one hour, 0,24 kcal would be needed, so long as there were no change in conditions, (humidity, condensation, etc.).

We’re working with a rounded off value of 0,29 kcal/m 3 °C. Reached through the equivalent: Density x specific thermal capacity = 1,2 x 0,24 = 0,29.

Passive thermal heating / Convection

Example

• Cooling performance 850 Watt (Performance loss in cabinet)

• max. outside temp. 30 °C

• max. inner cabinet temp. 50 °C

• Cabinet dimensions Bridth 1m, height 2 m, depth 0,6 m

• Cabinet location Bridth 1m x 2 m against the wall

• Cabinet construction Aluminium

P Convection (Heat performance, emitted through the side panels)

P conv .= Ax Δ T x k k= 5W / m² °C (for Aluminium) P conv .= 5m2x 20 °Cx 5W/m 2°C= 500Watt ΔT = T cabinet – T outside A = Cabinet surface area

Diagram

The thermal performance can be read in graphical form, from the adjacent diagram.

Principio di funzionamento

The climate cabinet functions similar to an air-air heat exchanger. By this we mean an outer and inner air circulation. The climate cabinet has the function, to transfer heat between two medias with various

temperatures (the cooler media carries the heat up, and the warmer media, down).

The climate cabinet is built on an air-air opposing principle. That means that the two air flows exchange direction in the cabinet thermal flow. The main advantage over air-vents, is that the two air flows do not mix. The heat, in relation to the cooling performance of the climate cabinet is dependant on:

• The exchange area of the cabinet

• Type of medien (by us always air)

• Air density inside and outside

• Temperature difference between inside and outside the cabinet

Mostly the values for the cabinet are given, only the air temperatures inside and outside are to be given.

The cooling performance changes, when the temperature differences changes. By constant temperature differences, the cooling performance doesn’t change.

The cooling performance (in Watt) and the temperature difference (pro grad Kelvin, or °C), between outside and inside air can be exchanged and printed out as a specific cooling performance.

Climate cabinet example

Following values are known: – Specific cooling performance 50 W/K

– max. permitted temp. 45 °C

– max. foresee outside temp. 35 °C Resulting in: Cooling performance = 50 x (45–35) = 500W

The climate cabinet can retain a temperature of 45 °C with a max. ambient temperature of 35 °C.

By a performance loss of 500 W or less in the cabinet, the max. temperature in the cabinet can be guaranteed. The climate cabinet volume decides the number of fans to be fitted in the cabinets top spacing. This generates a vacuum flow in the top compartment of the cabinet which meets the air-flow

from the bottom hollow chambers at ca. 3,6 m/s. Through the controlled inflow speed in the chambers of the doors, side-and back panels is an optimal air quantity in the outside circulation guaranteed, independent of the size of the cabinet.

Allestimenti

Esempi costruttivi

Esempi costruttivi

Esempi costruttivi

Esempi applicativi

Climate cabinet closed with swivel grip handle and locking cylinder Special plinth for the application to a concrete grounding With removable lifting rings, ensuring an easy transport and placing of the c

Version with side door entry to mains field, with separate cylinder lock Double winged front with telescope door-restrainer With outer environmental seal, and inner R.F.-shielding

Outer hanging front with inner securing Stainless steel, pull out or fixed battery compartment (max. weight 220 kg) 19”/ ETSI swivel frame (180° pivotable) 19”/ ETSI fixed extrusure

Moduli di climatizzazione serie ACM