Praesideo 3.5 Installation and User Instructions 7 System Hardware Installation

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P = power (W)

U = DC voltage (V)

I = DC current (A)

Because all the Praesideo units have built-in switched mode power supplies, the power consumption is virtually constant and within a certain range independent of the supply voltage V. The lower V is, the higher I will be.

33.5 Cooling capacity

A simple formula is used to calculate the required cooling capacity of an air conditioner for a technical room where Praesideo equipment is installed. It is based on the fact that only power amplifiers and basic amplifiers contribute to the heat generated in a room; the contribution of other Praesideo equipment is negligible. The maximum ambient temperature for Praesideo rack-mounted equipment is 55 ºC.

Energy is power multiplied by time. The unit of energy is Joule; a Joule is the same as a Watt*second. Therefore, one Watt of dissipation inside the rack during a period of one second results in one Joule of energy.

The calculation is based on the LBB4428 amplifier, since all other amplifiers are slightly more efficient. An LBB4428 consumes 800 W during full power operation, so with an output of 480 W (8 channels of 60 W), the amplifier dissipates the difference (320 W). The theoretical energy that is produced as heat inside the unit is 320 Watt * 3600 seconds = 1,152 kJoule each hour, or 27,648 kJ each day (24 hours). In reality, however, the energy will be a lot less. The Praesideo amplifiers are only allowed to be driven:

•at full power for 1 minute,

•at half power (-3dB) for 30 minutes for emergency tones (these are generated at -3 dB level),

•continuously at quarter power (-6dB) for calls or emergency announcements, or for BGM.

The continuous quarter power limitation gives enough margin to use the amplifier well into the limiter, because the crest factor of speech is around 8..10 dB, and for music also at least 6 dB. So, this is a safe worst-case margin.

Based on this, the maximum heat energy generated in a day (24 hrs) is:

(800 W - 480 W) * 1 minute + (397 W - 240 W) * 30 minutes + (228 W - 120 W) * 1400 minutes = 320 W * 60 s + 157 W * 1800 s + 108 W * 84,000 s = 9,373,800 Ws = 9,374 kJ.

This is equivalent to a light bulb of 110 W for a single Praesideo amplifier of any type. The power dissipation of the amplifiers should be summed. To calculate in BTU (British Thermal Units), divide the amount of kJ by 1.055. To calculate in kcal, divide the amount of kJ by 4.184. To calculate the heat production per hour instead of per day, divide by 24.

So 9,400 kJ/day = 9.4 MJ/day = 2,240 kcal/day = 8,900 BTU/day = 390 kJ/hr = 93 kcal/hr.

Bosch Security Systems 2011-02

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Bosch Appliances 3.5 manual Cooling capacity
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3.5 specifications

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