Installation; 15-1.How To Calculate The Necessary Heating Capacity - Mitsubishi Electric City Multi PWFY-P100VM-E-BU Data Book

15. INSTALLATION

15-1. How to calculate the necessary heating capacity
15. INSTALLATION
Heating capacity calculation
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%
Calculation example
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.
MEES19K013
kW
%
°C
°C
%
Hours
/person x Person =
/Person x Person =
°C
x ( -
x ( -
-
/ 860 x 1,000 /
+
%) +
%
+ %) / 12.5 kW* =
20 kW
10 %
10 °C
60 °C
15 %
Hours
8
60 /person x 20 Person =
8 /Person x 30 Person =
60
°C
40
x ( -
x ( 45 -
60 -
/ 860 x 1,000 / 8
+
10 %) +
20
%
+ 20 %) / 12.5 kW* =
PWFY unit Tank
(Water Temp. Condition
(Water Temp. Condition
) / (
) / (
) =
= kW
x (100% +
units
units are required
PWFY unit Tank
1,200 (Water Temp. Condition
240 (Water Temp. Condition
10 60
) / (
10 ) / ( 60
10 ) = 44.4
= 6.45 kW
6.45 x (100% + 15
units
2.82
units are required
3
AIR TO WATER
4
7
3 3
3
3
°C)
°C)
- )
- )
M cal / day
%) = kW
4
7
3 3
3
3
40 °C)
°C)
45
10
- )
- 10 )
M cal / day
%) = 29.42 kW
51