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69
8. SYSTEM DESIGN GUIDE
WR2-Series-575V
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 instal-
lation place should be taken into account, the closed type tank should be used by considering corrosion problems.
The capacity of heat storage tanks is determined in accordance with the daily maximum heating load that includes
warming up load to be applied for the day after the holiday.
HQ
2T
( 1 - ) - 860 × Pw × T
2
- QH × T
2
V =
(ton)
∆T × 1,000 × ƞV
1
COP
h
HQ
2T
( 1 - ) - 3,412 × Pw × T
2
- QH × T
2
V =
(Ibs)
∆T × ƞV
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 × Pw × T
2
V =
(ton)
∆T × 1,000 × ƞV
HQ
2T
:
Maximum heating load including load required for the day after the holiday
(kcal/day)
∆T
:
Temperature difference utilized by heat storage tank
(°C)
ƞV
:
Heat storage tank efficiency
HQ
2T
: 1.3 × (ƩQ'a + ƩQ'c + ƩQ'd + ƩQ'f) T
2
- ψ (ƩQe2 + ƩQe3) (T2 - 1)
1
COP
h
HQ
2T
( 1 - ) - 3,412 × Pw × T
2
V =
(Ibs)
∆T × ƞV
HQ
2T
:
Maximum heating load including load required for the day after the holiday
(BTU/day)
∆T
:
Temperature difference utilized by heat storage tank
(°F)
ƞV
:
Heat storage tank efficiency
HQ
2T
: 1.3 × (ƩQ'a + ƩQ'c + ƩQ'd + ƩQ'f) T
2
- ψ (ƩQe2 + ƩQe3) (T2 - 1)
1
COP
h
HQ
2T
:
Maximum heating load including load required for the day after the holiday
(kcal/day)
∆T
:
Temperature difference utilized by heat storage tank
(°C)
ƞV
:
Heat storage tank efficiency
HQ
2T
: 1.3 × (ƩQ'a + ƩQ'c + ƩQ'd + ƩQ'f) T
2
- ψ (ƩQe2 + ƩQe3) (T2 - 1)
HQ
2T
:
Maximum heating load including load required for the day after the holiday
(BTU/day)
∆T
:
Temperature difference utilized by heat storage tank
(°F)
ƞV
:
Heat storage tank efficiency
HQ
2T
: 1.3 × (ƩQ'a + ƩQ'c + ƩQ'd + ƩQ'f) T
2
- ψ (ƩQe2 + ƩQe3) (T2 - 1)
When auxiliary heat source is operated after stopping of water heat source CITY MULTI unit
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