Indiana Administrative Code
Title 170 - INDIANA UTILITY REGULATORY COMMISSION
Article 6 - WATER UTILITIES
Rule 3 - Central Station Hot Water Heating Utilities
Section 3-11 - Temperature standards

Universal Citation: 170 IN Admin Code 3-11

Current through March 20, 2024

Authority: IC 8-1-1-3; IC 8-1-2-4

Affected: IC 8-1-2-33; IC 8-1-2-34

Sec. 11.

Station Operating Schedule of Temperatures.

(a) The standard for heating service shall be determined by the average temperature of the flow and return water in the mains at the heating plant of the utility and shall not be less than that indicated in the following table showing the average temperatures of flow and return.

(b) The average temperature of station flow and return water shall be determined by dividing by two the sum of the temperature of the water in the flow main and the temperature of the water in the return main.

TABLE I

Table Showing Average Temperatures of Flow and Return Water

Day Schedule Permissible Night Schedules
Outside Temperature Degrees Fahrenheit 6:00 a.m. to 6:00 p.m. 6:00 p.m. to 9:30 p.m. 3:30 a.m. to 6:00 a.m. 9:30 pm. to 3:30 a.m.
70 80 85 70
65 92 98 82
60 102 107 92
55 111 116 101
50 121 126 111
45 129 134 119
40 137 142 128
35 144 148 136
30 151 154 145
25 158 160 154
20 164 165 162
15 170 170 170
10 175 175 175
5 180 180 180
zero 184 184 184
-5 187 187 187
-10 190 190 190
-15 191 191 191
-20 192 192 192

NOTE.-See appendix [ 170 IAC 6-3-27 ] for schedule of station flow temperature.

TABLE II

Table Showing Temperature-Lowering Coefficients of Wind Movements

Outside Temperature Temperature-Lowering Effect per Mile per Hour
50° to 40° .75 degrees
40 to 30 1.00 degrees
30 to 20 1.10 degrees
20 to 10 1.20 degrees
10 to 0 1.30 degrees
0 to -10 1.40 degrees
-10 to -20 1.50 degrees

TABLE III

Table Showing Temperature-Lowering Effect of Wind

Outside Temperature Light 5 to 10 m.p.h. Wind Medium 10 to 15 m.p.h. Strong 15 to 20 m.p.h.
50° to 40° 6° 9° 13°
40 to 30 8 13 17
30 to 20 8 14 19
20 to 10 9 15 21
10 to 0 10 16 23
0 to -10 10 17 25
-10 to -20 11 19 26

NOTE.-The plant operator will vary these wind coefficients to suit local conditions.

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