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11. SYSTEM DESIGN
11-3-2. Calculating the Necessary Heat Capacity
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 23 °F)
Safety factor for Heat Loss;
Operating time;
For Shower;
G/Person x
For Bathrooms;
G/Person x
The conversion of water volume to
x
(
+
x
(
=
G/day
Heating Capacity Calculation for sanitary usage
/ 1,000 x (
The conversion of M BTU to BTU
x 1,000 /
C. Total (A+B)
Total Heating Capacity
x (100%
+
D. No. of units required
Safety factor;
x (100%
+
BTU
%
PWFY unit
°F
°F
%
Hours
Person =
Person =
°F
-
-
-
=
%)
+
%
%) / 39900BTU =
PWFY-P-NMU-E-BU/PWFY-P-NMU-E-AU (Sept. 2010)
Tank
4
3
3
G (Water Temp. Condition
G (Water Temp. Condition
)
/
(
-
)
/
(
-
)
/ 2 =
M BTU / day
BTU
x (100%
+
%) =
units
units are required
7
3
3
°F)
°F)
)
)
BTU
PWFY-33
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