Heat Loss Tabulation Forms

Manufacturers of heating equipment will often provide heat loss tabulation forms and instructions for their use. Lists of the most commonly used U-values (or factors) are included with the forms. Figures 4-4 and 4-5 show examples of these forms and instructions obtained from Amana Refrigeration, Inc.

Ifl&idc Design Te? np._

RESIDENTIAL HEAT LOSS TABULATION

Outside Design Temp._______________

Date_____________________________________________________

T«mp. Difference _________ _____ .

Computed By_____________________________________________ Temp. Difference +10._________________

Living Ream Dining Room Krl<H«n Bedroom 1 Bedroom 2 Bath Rooms

Btu

1. Room Siie (LxWxH) Totsfs

2. Linear Fl. Exp. Wflli

3. Floor Area

Ar. or Ar. or Ar. or Ar. or Ar. or Ar. or Ar. of Ar. or

Factor Ln. Ft. BTU lit — Ft. BTU Ln, Ft. BTU Ln. Ft. BTU Lr. Ft. BTU Ln. Ft. BTU In Ft. BTU In. Ft. BTU

4. Window»

5. Door»

6 Exp W*ll 7. Ceiling

8. Infiltration

9. SUB TOTALS

10, Sub-TotaMorT. br

11, Floor Btu for T. D.

12, Partition Qtu far T. D.

13, Room Total Btu Loss

Windows	U FacTon	Exp. Walls		U Factors		% Duct Loss Sthtdult
Single Pa«« …………………………………………	1	.13		Clapboard	Brick		Stem« 1 Story	1 Vt Story	2 Story
Double Pane, Sealed………………………………		.57	Frame Construction With:	Or Shingte	Venr		Ducts rnsul. 10	В	6
Sto/m Windows, Tight…………………………….		.45	No InvjtoMon	.25	.26		■[2] Ouctt No Insul. 30	25	20
Storm Windows, Loose……………………………		.75	»i" ln*\|. Board	.19	.21		.24
Glass Slack…………………………………………		.50	2" Intl. B*tts	.11	.12		.12
T. D. — — TEMPERATURE DIFFERENCE			3*fc" ln»l — Bdt:$	.09	.10		.10
Wood Do-on U Fcfor		Ceilings			Infiltration (factor times lineal ft. of crack)
Nom. Thickness No Storm		Storm Door tVenf: Altie sPa<e	Abovt)		W«ather Stripped Not Weather Stripped
1" .69		.35	■ Nd fnsulalion..			-5 U	Double Hung Window {0) .22		.35
1 Vi’ 52		.30	4" Insulation. .			.09	Pivoting Window» (b) .30		.50
2" .46		,23	6′ Insulation			.05	Doors (cj 60		1.00
2Va" 38		.25					Fixed Window (dj.13		.13
		CONCRETE FLOOR ON «ROUND
		Btu Per Hr, Per Lineal Ft. of Ђdg«
Outside Design Temp. 25	20	15	JO 5 0-5	-10 —	-15 “20	-25	-30
L, r Vert. Insul. Extending
Down 10^ Below Surface 55	62	68	75 80 85 90	95	100 105	110	115
1 L Type Insul. Extending
12w Down and 12^ Under 50	57	63	70 75 BD B5	90	95 100	105	^0 Double Wood Ffoori	Or Partition

2 L Type Insul. Extending

12” Down and 2H Under 41? 45 50 55 60 65 70 75 BO 85 90 95

»Vi*h Air Spacc

Temp. D:ff.

No edge insulation and no heat in »lob

Facto.’ No Insu I.

Thij construction not recommended.

Factor 2" Insul.

Address…………………………………………………………………………………………………..

Installation by…………………………………………………………………………………………

Estimate by……………… .,…………………………………………………………. Date………

Model………………………………………….. *…………………… ; Size……………………..

………….. sq. ft.; Gross Inside Vofume………………………………………………………………..

Dry-Bi/lb Temperature (F)

Customer………..

Buyer………………………………

Estimate Number……………..

Equipment Selected…. Direction House Faces . Design Conditions:

Outside

… cu. ft.

Gross Floor Area

AREA

(Sq. ft.)

Except ftem 4; Linear Ft.

FACTOR

(Circle the factors applicable.)

BTU/HR

(Area x Factor)

ITEM

DESIGN DRY-BUIB TEMPERATURE (F)

’10 0 10 20 25

-30

-20

I. WINDOWS

{total of afl windows)

Sing le-g last………………………………………………. Double glass or glass block	………. 113 ……….. 50	102 45	Ь. « a o	79 35	68 30	57 25	51 23	45 20	40 18
2. WALL5 No insulation (brick veneer, Frame, stucco, masonry) ………………………….	……… 25	23	20	IB	15	13	11	10	9
1 in. insulation or % il» insulating sheathing….	……….. 20	18	16	14	12	10	9	8	7
2 in. or more insulation………………………………..	………. 10	9	0	7	6	5	5	4	4

3. ROOFS

Pitched or flat with vented air space and:

No insulation…………………………………………….	31	28	25	22	19	16	U	12	11
2 in. insulation…………………………………………..	10	9	8	7	6	5	5	4	4
4 in. insulation………………………………………….	………….. 7	6	6	5	4	4	3	3	7
Flat with no air space and:
No Insulation…………………………………………….	………….. 50	45	40	35	30	25	23	20	1 8
In. insulation………………………………………	25	23	20	18	15	13	11	10	9
1 Vn in. insulation…………………………………….	15	14	12	11	9	8	7	6	5
3 in. insulation…………………………………………..	10	9	8	7	6	5	5	4	4
4 FLOORS
Over—(sq. ft, area):
Basement………………………………………………..	0	0	0	0	0	0	0	0	0
Enclosed erawf space……………………………….	…………. 23	20	16	16	14	11	SO	9	8
Op? n crawl space……………………………………..	…….. 34	31	27	24	20	17	15	14	12
On ground—(linear feet):
No edge insulation	…….. 81	73	65	57	49	41	37	32	28
1 in. edge insulation………………………………….	………….. 6S	61	54	48	41	34	31	27	24
2 in. edge insulation………………………………….	55	50	44	39	33	28	25	22	19
5. OUTSIDE AfR
Total Floor4 A>ea (sq. ft.) …………………………..	14	13	1 1	10	E	7	6	6	5

6. TOTAL {Sum of 1 through 5}

Figure 4-5 Residential heating load estimate form. (CourtesyAmana Refrigeration, Inc.)

Posted in Audel HVAC Fundamentals Volume 1 Heating Systems, Furnaces, and Boilers

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