| PLATING & PRINTED CIRCUIT |
Engineering Heater Sizing Information
This chart provides an easy reference to estimate the KW required
to heat a tank. Heat losses from the surface of the solution
and from the sides of the tank have been taken into account.
Find the gallons in the left column then move to the column
with the corresponding temperature at which you will be heating
your solution. The number indicated there is the KW required
to do the heating job. This KW figure assumes a heat-up period
of six hours; for a twelve hour heat-up time simply divide
the KW figure in half.
| Temperature °F/°C |
Gals./
Liters |
100/
37.7 |
110/
43.3 |
120/
48.8 |
130/
54.4 |
140/
60.0 |
150/
65.5 |
160/
71.1 |
170/
76.6 |
180/
82.2 |
190/
87.7 |
200/
93.3 |
210/
98.8 |
50/
189.25
|
1 |
1 |
1 |
2 |
2 |
2 |
2 |
3 |
3 |
4 |
4 |
5 |
100/
378.5 |
2 |
2 |
3 |
3 |
3 |
4 |
4 |
5 |
6 |
6 |
8 |
8 |
200/
757 |
4 |
4 |
5 |
6 |
6 |
7 |
8 |
9 |
10 |
11 |
12 |
14 |
300/
1135.5 |
6 |
6 |
7 |
8 |
9 |
10 |
12 |
14 |
15 |
16 |
18 |
20 |
400/
1514 |
8 |
8 |
9 |
10 |
12 |
14 |
16 |
18 |
20 |
21 |
24 |
25 |
500/
1892.5 |
9 |
10 |
12 |
13 |
15 |
18 |
20 |
24 |
24 |
27 |
30 |
32 |
600/
2271 |
11 |
12 |
15 |
16 |
18 |
21 |
24 |
28 |
30 |
32 |
36 |
38 |
700/
2649.5 |
13 |
14 |
17 |
18 |
21 |
24 |
28 |
32 |
36 |
38 |
42 |
44 |
800/
3028 |
15 |
16 |
19 |
21 |
24 |
28 |
32 |
36 |
40 |
44 |
48 |
52 |
900/
3406.5 |
17 |
18 |
21 |
24 |
27 |
32 |
38 |
40 |
44 |
48 |
54 |
58 |
1000/
3785 |
18 |
21 |
24 |
27 |
30 |
36 |
40 |
44 |
48 |
54 |
58 |
64 |
CAUTION: This chart is for a quick estimate only. Use the
formula below for determining actual heat requirement.
Determining Specific Heating Requirements for Electric
Heaters
To determine the heating requirement of a tank, first obtain
the following information:
- Total cubic feet of tank. (Multiply the inside
dimensions of the tank - depth x width x length.)
- Total gallons of solution. (Multiply by 7.48 the
cubic feet of the tank occupied by the solution. If
the solution is normally 6" below the top of the tank,
allow this when figuring.)
- Average ambient (room) temperature at which the
tank will be used.
- Temperature level at which the solution is to
be held.
- Heat up time desired.
After this information is known, the following calculations
can be made:
| Formula: |
A x 1.0* x 8.35** x B
3412 x C |
= K |
| |
D x E |
= W |
* Specific heat of water. Insert specific heat of your solution
here.
**Weight of water. Insert specific weight of your solution here.
A = Total gallons of solution.
B = Difference between ambient temperature and desired solution temperature.
C = Desired heat-up time (hours).
D = Heat loss of tank - refer to the chart below.
E = Square feet of top of tank (multiply length x width).
Add the results of both calculations. The total is the Kilowatt
requirement of the tank.
K + W = KW
Sample Problem
Tank Specifications:
- Dimensions: 4' deep x 3' wide x 5' long or 448 gallons
- Operating Temperature: 160°
- Heat-Up Time: 6 hours
Assume tank heat-up to be from room temperature (70°F
to 160°F).
Initial Heat-Up Formula Application
448 gallons x 1.0 x 8.35 x 90
3412 x 6 hours |
= |
336672
20472
|
= 16KW |
Surface Loss Calculation:
15 sq. ft. (surface area) x .34 (open tank surface
loss factor) = 5KW
Total KW needed = 16KW + 5KW = 21KW
Surface Loss from Open Hot Water Tank with
Mild Air Agitation or Ventialtion (120) FPM (Expressed in KW)
|
Tank Temperature
°F - °C
|
Surface
Loss Factor |
| 80 - 26.7 |
.03 |
| 85 - 29.4 |
.05 |
| 90 - 32.2 |
.07 |
| 95 - 35.0 |
.09 |
| 100 - 37.8 |
.11 |
| 105 - 40.6 |
.13 |
| 110 - 43.3 |
.15 |
| 115 - 46.1 |
.18 |
| 120 - 48.9 |
.21 |
| 125 - 51.7 |
.25 |
| 130 - 54.4 |
.30 |
| 135 - 57.2 |
.35 |
| 140 - 60.0 |
.41 |
| 145 - 62.8 |
.45 |
|
 |
|
Tank Temperature
°F - °C
|
Surface
Loss Factor |
| 150 - 65.6 |
.51 |
| 155 - 68.3 |
.58 |
| 160 - 71.1 |
.65 |
| 165 - 73.9 |
.73 |
| 170 - 76.7 |
.83 |
| 175 - 79.4 |
.95 |
| 180 - 82.2 |
1.1 |
| 185 - 85.0 |
1.3 |
| 190 - 87.8 |
1.6 |
| 200 - 93.3 |
2.35 |
| 205 - 96.1 |
2.80 |
| 210 - 98.9 |
3.25 |
| 215 - 101.7 |
3.75 |
|
Surface Loss from Open Hot Water Tank (Expressed
in KW)
|
(Expressed in KW)
Tank Temperature
°F - °C
|
Surface
Loss Factor |
| 80 - 26.7 |
- |
| 85 - 29.4 |
.01 |
| 90 - 32.2 |
.02 |
| 95 - 35.0 |
.04 |
| 100 - 37.8 |
.05 |
| 105 - 40.6 |
.065 |
| 110 - 43.3 |
.09 |
| 115 - 46.1 |
.10 |
| 120 - 48.9 |
.12 |
| 125 - 51.7 |
.14 |
| 130 - 54.4 |
.16 |
| 135 - 57.2 |
.18 |
| 140 - 60.0 |
.21 |
| 145 - 62.8 |
.24 |
|
|
|
(Expressed in KW)
Tank Temperature
°F - °C
|
Surface
Loss Factor |
| 150 - 65.6 |
.27 |
| 155 - 68.3 |
.30 |
| 160 - 71.1 |
.34 |
| 165 - 73.9 |
.37 |
| 170 - 76.7 |
.41 |
| 175 - 79.4 |
.45 |
| 180 - 82.2 |
.50 |
| 185 - 85.0 |
.55 |
| 190 - 87.8 |
.60 |
| 200 - 93.3 |
.72 |
| 205- 96.1 |
.80 |
| 210 - 98.9 |
.87 |
| 215 - 101.7 |
.95 |
| 220 - 104.4 |
1.04 |
|
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