2 - 399
7. SYSTEM DESIGN GUIDE
DATA G10
HEAT SOURCE UNITS
WY
When heat storage tank is not used
HQ
1T
•
(
1 -
)
- 860 x Pw x T
2
QH = x K
(kcal)
T1
QH
1T
: Total of heating load on weekday including warming up
(kcal/day)
T
1
: Operating hour of auxiliary heat source
(h)
T
2
: Operating hour of heat source water pump
(h)
K
: Allowance factor (Heat storage tank, piping loss, etc.)
1.05~1.10
HQ
1T
is calculated from the result of steady state load calculation similarly by using the equation below.
HQ
1T
= 1.15 x (
S
Q'a +
S
Q'b +
S
Q'c +
S
Q'd +
S
Q'f) T
2
-
y
(
S
Qe
1
+
S
Qe
2
+
S
Qe
3
) (T2 - 1)
Q'a
: Thermal load from external wall/roof in each zone
(kcal/h)
Q'b
: Thermal load from glass window in each zone
(kcal/h)
Q'c
: Thermal load from partition/ceiling/floor in each zone
(kcal/h)
Q'd
: Thermal load by infiltration in each zone
(kcal/h)
Q'f
: Fresh outdoor air load in each zone
(kcal/h)
Q'e
1
: Thermal load from human body in each zone
(kcal/h)
Q'e
2
: Thermal load from lighting fixture in each zone
(kcal/h)
Q'e
3
: Thermal load from equipment in each zone
(kcal/h)
y
: Radiation load rate
0.6~0.8
T2
: Air conditioning hour
1
COP
h
HQ
1T
•
(
1 -
)
- 3,412 x Pw x T
2
QH = x K
(BTU)
T1
QH
1T
: Total of heating load on weekday including warming up
(BTU/day)
T
1
: Operating hour of auxiliary heat source
(h)
T
2
: Operating hour of heat source water pump
(h)
K
: Allowance factor (Heat storage tank, piping loss, etc.)
1.05~1.10
HQ
1T
is calculated from the result of steady state load calculation similarly by using the equation below.
HQ
1T
= 1.15 x (
S
Q'a +
S
Q'b +
S
Q'c +
S
Q'd +
S
Q'f) T
2
-
y
(
S
Qe
1
+
S
Qe
2
+
S
Qe
3
) (T2 - 1)
Q'a
: Thermal load from external wall/roof in each zone
(BTU/h)
Q'b
: Thermal load from glass window in each zone
(BTU/h)
Q'c
: Thermal load from partition/ceiling/floor in each zone
(BTU/h)
Q'd
: Thermal load by infiltration in each zone
(BTU/h)
Q'f
: Fresh outdoor air load in each zone
(BTU/h)
Q'e
1
: Thermal load from human body in each zone
(BTU/h)
Q'e
2
: Thermal load from lighting fixture in each zone
(BTU/h)
Q'e
3
: Thermal load from equipment in each zone
(BTU/h)
y
: Radiation load rate
0.6~0.8
T2
: Air conditioning hour
1
COP
h
