170 Ind. Admin. Code 6-3-25

Current through October 23, 2024

Section 170 IAC 6-3-25 - Estimate of required radiation; formula; table of factors

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
1/2 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

170 IAC 6-3-25

Indiana Utility Regulatory Commission; No. 17689: Standards of Service For Central Station Hot Water Heating Utilities Sec 25; filed Jan 2, 1946, 10:00 am: Rules and Regs. 1947, p. 1666; readopted filed Jul 11, 2001, 4:30 p.m.: 24 IR 4233; readopted filed Apr 24, 2007, 8:21 a.m.: 20070509-IR-170070147RFA

Readopted filed Aug 2, 2013, 2:16 p.m.: 20130828-IR-170130227RFA