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68
8. SYSTEM DESIGN GUIDE
WR2-Series-575V
When heat storage tank is not used
HQ
1T
•
(
1 -
)
- 860 × Pw × T
2
QH = × 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 × (ƩQ'a + ƩQ'b + ƩQ'c + ƩQ'd + ƩQ'f) T
2
- ψ (ƩQe
1
+ ƩQe
2
+ ƩQe
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)
ψ :
Radiation load rate
0.6~0.8
T2
:
Air conditioning hour
1
COP
h
HQ
1T
•
(
1 -
)
- 3,412 × Pw × T
2
QH = × 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 × (ƩQ'a + ƩQ'b + ƩQ'c + ƩQ'd + ƩQ'f) T
2
- ψ (ƩQe
1
+ ƩQe
2
+ ƩQe
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)
ψ :
Radiation load rate
0.6~0.8
T2
:
Air conditioning hour
1
COP
h
0000006382.BOOK 68 ページ 2021年7月19日 月曜日 午後4時14分