Mitsubishi Electric PLFY-WP VBM-E, Data Book

Page: 141 / 192

3. SYSTEM DESIGN GUIDE
2 - 52
WR2
MEE15K052
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
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