H.2 heat losses through envelope, H.3 heating load on ventilation, H.4 heating load due to infi ltration – Retrotec USACE User Manual
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H2 ENERGY & PROCESS ASSESSMENT PROTOCOL
H.2 Heat Losses through Envelope
Q
loss
=
∑
[k * A * (t
room
−
t
out
)]
where:
Q
loss
=
losses of heat through the building envelope, kW
k
=
overall heat transfer coeffi cient of the envelope element, W/m
2
* °C
A
=
area of the building element, m
2
t
room
=
indoor air temperature, °C
t
out
=
outdoor air or soil temperature, °C
H.3 Heating Load on Ventilation
Q
vent
=
* C
p
* Q
v
* (t
s
−
t
out
)
−
Q
HR
where:
Q
vent
= thermal load on ventilation, kW
= air density, kg/m
3
C
p
= heat capacity of air, kJ/(kg * °C)
q
vent
= ventilation airfl ow rate, m
3
/s
t
s
= supply air temperature, °C
t
out
= outdoor air or soil temperature, °C
Q
HR
= heat recovered from exhausted air by heat recovery equipment, kW
H.4 Heating Load Due to Infi ltration
Q
inf
=
* C
p
* q
inf
* (t
i
−
t
out
)
where:
Q
inf
= heat losses due to infi ltration, kW
= air density, kg/m
3
C
p
= heat capacity of air, kJ/(kg * °C)