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MODULE III |
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MODULE III |
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Plant slope
For a desired constant room temperature, the transmission heat increases linearly
with sinking outside temperatures ts. In order to now cover the increasing heat
loss, the supply air temperature t1 must also be raised linearly (not taking
extraneous heat into account). The proportionality factor of such a heating
curve is known as slope.
English translation
of technical terms and sentences in the formula above:
Anlagensteilheit = Plant slope
Plant slope is thus dependent upon the necessary change in the supply air temperature
t2 per K change in the
outside temperature t3
and the necessary change in supply air temperature is, in turn, determined by
transmission (insulation) and the specified air exchange rate.
1.4.3 Calculation formulae
Room air renewal
If the necessary outside air volume \/3 has been determined in m3/s for the
ventilated room shown in Fig. 20, the heat output Q of the air heater, expressed
in kJ/s = kW, necessary for heating the outside air at the temperature t3 to
the supply air temperature t1, can be calculated from the following equation:
Fig. 20 Room air renewal
English translation of technical terms and sentences in Fig. 20:
| Wärmeleistung | = | heat output |
| Zulufttemperatur | = | supply air temperature |
| Außenlufttemperatur | = | outside air temperature |
| Dichte der Luft | = | air density |
| Spez. Wärme der Luft | = | specific air heat |