Mitsubishi Electric City Multi PWFY-P36NMU-E-BU Data Book page 52

15. INSTALLATION
Heating capacity calculation (Unit: °C/kW/ℓ)
A. For Air conditioning using such as Panel Heaters, Floor Heating and Fan coil units
Required total heating capacity
Safety factor;
B. For Sanitary use such as Shower and Bathrooms
Conditions
Tank inlet water Temp.;
Tank outlet water Temp.;
(Set Temp -5 °C)
Safety factor for Heat Loss;
Operating time;
For Shower;
For Bathrooms;
The conversion of water volume to
+
= ℓ /day
Heating Capacity Calculation for sanitary usage
/ 1,000 x (
The conversion of M cal to kW
C. Total (A+B)
Total Heating Capacity
x (100%
D. No. of units required
Safety factor;
x (100%
A calculation example (Unit: °C/kW/ℓ)
A. For Air conditioning using such as Panel Heaters, Floor Heating and Fan coil units
Required total heating capacity
Safety factor;
B. For Sanitary use such as Shower and Bathrooms
Conditions
Tank inlet water Temp.;
Tank outlet water Temp.;
(Set Temp -5 °C)
Safety factor for Heat Loss;
Operating time;
For Shower;
For Bathrooms;
The conversion of water volume to
1,200
+ 240
= ℓ /day
888
Heating Capacity Calculation for sanitary usage
888 /1,000 x (
The conversion of M cal to kW
44.4
C. Total (A+B)
Total Heating Capacity
x (100%
20
D. No. of units required
Safety factor;
29.42 x (100%
* The value shown here is the rated capacity, and varies depending on the installation conditions.
MEES20K028
kW
%
°C
°C
%
Hours
/Person x Person =
/Person x Person =
°C
x ( -
x ( -
-
/ 860 x 1,000 /
+
%) +
%
+
%) / 11.7 kW =
20 kW
10 %
10 °C
60 °C
15 %
8 Hours
60 /Person x 20 Person =
8 /Person x 30 Person =
°C
40
x ( -
x ( 45 -
60 -
/ 860 x 1,000 / 8
+
10 %) +
20 %
+ 20 %) / 11.7 kW =
PWFY unit Tank
(Water Temp. Condition
(Water Temp. Condition
) / (
) / (
) =
= kW
x (100% +
units
units are required
1,200 (Water Temp. Condition
240 (Water Temp. Condition
10 60
) / (
10 ) / ( 60
10 ) = 44.4
= 6.45 kW
6.45 x (100% + 15
2.82 units
3
units are required
AIR TO WATER
4
7
3 3
3 3
°C)
°C)
- )
- )
M cal / day
%) = kW
40 °C)
°C)
45
10
- )
- 10 )
M cal / day
%) = 29.42 kW
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