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CHAPTER 1
Ventilation for Healthy Living
Determining internal heat gain
When classifying loads, the internal heat gain (indoor generated heat + indoor infiltration heat) will be the value of the outdoor
air load subtracted from the approximate cooling load when it is assumed that there is no reheating load.
(Internal heat gain)
2
= 157.0 W/m
– 53.0 W/m
This value of internal heat gain is based on assumptions for typical loads. To determine individual levels of internal heat
gain, the following is suggested:
Indoor generated heat
(1) Heat generated from people
Heat generation design value per person in office
Sensible heat (SH)= 63.0 W/person
Latent heat (LH)
= 69.0 W/person
Total heat (TH)
= 132.0 W/person
The heat generated per 1 m
(heat generated from people)
= 132.0 W/person × 0.2 person/m
(2) Heat generated from electrical equipment (lighting)
The approximate value of the room illuminance and power for lighting for a general office with illuminance of 300 -
350 Lux, is 20 - 30 W/m
Indoor infiltration heat
This is the heat that infiltrates into the building from outside. This can be determined by subtracting the amount of heat
generated by people and lighting from the internal heat gain.
(Indoor infiltration heat)
= 104.0 – (26.4 + 30.0) = 47.6 W/m
The Lossnay recuperates approximately 70% of the outdoor air load and saves on approximately 20% of the total load.
12
2
2
= 104.0 W/m
2
of floor space is
2
= 26.4 W/m
2
.
2
2
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