7. SYSTEM DESIGN GUIDE
DATA G10
HEAT SOURCE UNITS
2 - 400
WY
b) Heat storage tank
Heat storage tank can be classified by types into the
open type heat storage tank exposed to atmosphere,
and the closed type heat storage tank with structure
separated from atmosphere. Although the size of the
tank and its installation place should be taken into ac-
count, the closed type tank is being usually employed
by considering corrosion problems.
The capacity of heat storage tanks is determined in ac-
cordance with the daily maximum heating load that in-
cludes warming up load to be applied for the day after
the holiday.
HQ
2T
(
1 -
)
- 860 x Pw x T
2
- QH x T
2
V =
(ton)
D
T x 1,000 x
h
V
1
COP
h
HQ
2T
(
1 -
)
- 3,412 x Pw x T
2
- QH x T
2
V =
(Ibs)
D
T x
h
V
1
COP
h
When auxiliary heat source is operated during operation and even after stopping of water heat source CITY MULTI unit
HQ
2T
(
1 -
)
- 860 x Pw x T
2
V =
(ton)
D
T x 1,000 x
h
V
HQ
2T
: Maximum heating load including load required for the day after the holiday (kcal/day)
D
T
: Temperature difference utilized by heat storage tank
(deg°C)
h
V
: Heat storage tank efficiency
HQ
2T
: 1.3 x (
S
Q'a +
S
Q'c +
S
Q'd +
S
Q'f) T2 -
y
(
S
Qe2 +
S
Qe3) (T2 - 1)
1
COP
h
HQ
2T
(
1 -
)
- 3,412 x Pw x T
2
V =
(Ibs)
D
T x
h
V
HQ
2T
: Maximum heating load including load required for the day after the holiday (BTU/day)
D
T
: Temperature difference utilized by heat storage tank
(deg°F)
h
V
: Heat storage tank efficiency
HQ
2T
: 1.3 x (
S
Q'a +
S
Q'c +
S
Q'd +
S
Q'f) T2 -
y
(
S
Qe2 +
S
Qe3) (T2 - 1)
1
COP
h
HQ
2T
: Maximum heating load including load required for the day after the holiday (kcal/day)
D
T
: Temperature difference utilized by heat storage tank
(deg°C)
h
V
: Heat storage tank efficiency
HQ
2T
: 1.3 x (
S
Q'a +
S
Q'c +
S
Q'd +
S
Q'f) T2 -
y
(
S
Qe2 +
S
Qe3) (T2 - 1)
HQ
2T
: Maximum heating load including load required for the day after the holiday (BTU/day)
D
T
: Temperature difference utilized by heat storage tank
(deg°F)
h
V
: Heat storage tank efficiency
HQ
2T
: 1.3 x (
S
Q'a +
S
Q'c +
S
Q'd +
S
Q'f) T2 -
y
(
S
Qe2 +
S
Qe3) (T2 - 1)
When auxiliary heat source is operated after stopping of water heat source CITY MULTI unit
