Indiana Administrative Code › Title 170 - INDIANA UTILITY REGULATORY COMMISSION › Article 6 - WATER UTILITIES › Rule 3 - Central Station Hot Water Heating Utilities › Section 3-25 - Estimate of required radiation; formula; table of factors

Current through July 10, 2024
Authority: IC
				  8-1-1-3;
				  IC
				  8-1-2-4
Affected: IC
				  8-1-2-33
Sec. 25.
Estimating Radiation Required.
(a) As a tentative basis for the billing of
				contemplated new consumers and of such other consumers where there is complaint
				of inadequate service indicating insufficient radiation, each utility shall
				measure the buildings and premises of said consumers for radiation required by
				the formula and as set out in the table showing temperature-lowering
				coefficients of wind movements.
(b)
				Upon the request of any consumer, or the commission, the utility shall furnish
				a complete detailed set of figures and data relating to the radiation
				requirements, in said consumer's premises, upon which it is proposed that the
				consumer is to be billed for heating service.
(c) The utility supplying hot water heating
				service shall not be required to contract with any consumer to heat only a part
				of the used portion of a building, residence, or apartment where such other
				parts of the building or buildings are not provided with adequate radiation
				suitably connected.
Table Showing Formula for Estimating Radiation
R = C × Fc + (E-W-D) × Fe + (W × Fw) + (D
				  × Fd)
Where: R = Required radiation in square feet.
C = Cubic feet of contents.
E = Square feet of exposed walls.
W = Square feet of windows.
D = Square feet of doors.
Fc = Factor for cubic contents as shown in table.
Fe = Factor for exposed walls, ceiling or floors as in
				  table.
Fw = Factor for windows as shown in table.
Fd = Factor for doors as shown in table.
Table of Factors
Kind of Exposure
Difference in Temperature Between Room and
						  Outside
Fw
60°
65°
70°
75°
80°
Single glass .........................................
.478
.517
.557
.595
.705
Double or plate glass ..................................
.212
.229
.247
.265
.282
Single sky light ......................................
.382
.413
.445
.477
.508
Double sky light .....................................
.212
.229
.247
.265
.282
Fd
Good door, one-half glass ..............................
.244
.265
.285
.305
.325
Good door, solid .....................................
.170
.184
.198
.212
.226
Fe
Frame wall (N-W exposure) ............................
.148
.160
.173
.185
.198
Frame wall (S-E exposure) .............................
.134
.146
.159
.171
.184
12" masonry wall (N-W exposure) ........................
.106
.115
.124
.132
.141
12" masonry wall (S-E exposure)
						  .........................
.093
.102
.111
.119
.128
17" masonry wall (N-W exposure) ........................
.085
.092
.099
.106
.113
17" masonry wall (S-E exposure)
						  .........................
.071
.078
.085
.092
.099
Ceiling with no heat in space above
						  .......................
.106
.115
.124
.132
.141
Floor with no heat in space below
						  ........................
.053
.057
.062
.067
.071
Partition wall (frame plastered) but no heat on other
						  side ......
.071
.077
.082
.088
.094
Cubic Contents
Fc
½ change of air per hour- Garages, etc
						  .....................
.0032
.0035
.0038
.0040
.0043
1 change of air per hour- Dwellings, officers, etc. .
						  ...........
.0064
.0069
.0075
.0080
.0086
2 changes of air per hour-Public assembly rooms
						  ............
.0128
.0139
.0150
.0160
.0172