PWFY-33
PWFY-P-NMU-E-BU/PWFY-P-NMU-E-AU (Sept. 2010)
PWF
Y-P-N
MU-E-BU
PWF
Y-P-N
MU-E-AU
11. SYSTEM DESIGN
+
+
A. For Air conditioning using such as Panel Heaters, Floor Heating and Fan coil units
Required total heating capacity
BTU
Safety factor;
%
B. For Sanitary use such as Shower and Bathrooms
Conditions
Tank inlet water Temp.;
°F
Tank outlet water Temp.;
°F
(Set Temp 23 °F)
Safety factor for Heat Loss;
%
Operating time;
Hours
For Shower;
G/Person x
Person =
G (Water Temp. Condition
°F)
°F)
For Bathrooms;
G/Person x
Person =
G (Water Temp. Condition
The conversion of water volume to
°F
x
(
-
)
/
(
-
)
+
x
(
-
)
/
(
-
)
=
G/day
Heating Capacity Calculation for sanitary usage
/ 1,000 x (
-
) / 2 =
M BTU / day
The conversion of M BTU to BTU
x 1,000 /
=
BTU
C. Total (A+B)
Total Heating Capacity
x (100%
+
x (100%
%) +
x (100%
%) =
BTU
D. No. of units required
Safety factor;
%
%) / 39900BTU =
units
units are required
Tank
PWFY unit
4
3
3
3
3
7
11-3-2. Calculating the Necessary Heat Capacity
