Heatcraft Refrigeration Products H-ENGM0408, H-ENGM0806 Appendix - Tables, Table Wall Heat Loads

Appendix - Tables

Table 1

Wall Heat Loads

	Insulation (Inches)					Heat Load (BTU Per 24 Hours Per One Square Foot of Outside Surface)
Cork	Glass		Urethane
or	Fiber or	Urethane	(Foamed							Temperature Reduction in ºF.
Mineral	Poly-	(Sprayed)	in	R				(Outside Air Temperature Minus Room Temperature)
Wool	Styrene		Place)
k = .30	k = .26	k = .16	k = .12		1		40	45	50	55	60	65	70	75		80	85	90	95	100	105	110	115	120
	1			4	5.10		204	230	255	281	306	332	357	383		408	434	459	485	510	536	561	587	612
	2			8	3.40		136	153	170	187	204	221	238	255		272	289	306	323	340	357	374	391	408
4	3	2		12.6	1.80		72	81	90	99	108	117	126	135		144	153	162	171	180	189	198	207	216
5	4		2	16.4	1.44		58	65	72	79	87	94	101	108		115	122	130	137	144	151	159	166	173
6	5	3		19.6	1.20		48	54	60	66	72	78	84	90		96	102	108	114	120	126	132	138	144
8	6	4	3	25	0.90		36	41	45	50	54	59	63	68		72	77	81	86	90	95	99	104	108
10	8		4	33	0.72		29	32	36	40	43	47	50	54		58	61	65	68	72	76	79	83	86
	10	6		38.7	0.60		24	27	30	33	36	39	42	45		48	51	54	57	60	63	66	69	72
			6	50	0.48		19	22	24	26	29	31	34	36		38	41	43	46	48	51	53	55	58
Single window glass				. 9	27		1080	1215	1350	1490	1620	1760	1890	2030	2160		2290	2440	2560	2700	2840	2970	3100	3240
Double Window Glass			2.2	11	440		495	550	610	660	715	770	825	880		936	990	1050	1100	1160	1210	1270	1320
Triple Window Glass				3.4	7		280	315	350	390	420	454	490	525		560	595	630	665	700	740	770	810	840
6” Concrete Floor				4.8	5		200	225	250	275	300	325	350	375		400	425	450	475	500	525	550	575	600

Note: Above insulation “K” Factors [Thermal Conductivity, BTU per (hour) (square foot) (ºF. per inch of thickness)] and heat gain factors for Cork and Window Glasses are extracted and

reprinted by permission from ASHRAE 1972 HANDBOOK OF FUNDAMENTALS.

Insulation Values

“K” Factor	- Insulating Value of any material is rated by its thermal conductivity
“U” Factor	-	Overall coefficient of heat transfer, BTU per hour/per square foot/per degree F.
“R” Factor	-	Thermal resistances

“X” = Inches of Insulation

K = UX = X/R

U= K/X = 1/R R = 1/U = X/K

Table 2

Effective K Factor in Block Thickness of Insulation

Insulation	Insul. K Factor	6”	8”	10”	12”
Air	4.65	6.94	6.65	6.50	6.40
Vermiculite	.47	2.73	2.67	2.64	2.62
Sawdust	.45	2.70	2.65	2.62	2.60
Cork	.38	2.62	2.57	2.55	2.53
Rock Wool	.30	2.52	2.49	2.47	2.45
Mac. Paper	.28	2.50	2.46	2.45	2.43
Styrofoam	.24	2.45	2.42	2.40	2.40
Polyurethane	.16	2.36	2.33	2.33	2.32

Note: If blocks have 3 holes, add .75 to all of the values shown. The above data is being shown for reference purpose only - this is a very inefficient method of construction/insulation due to:

1.Concrete webs are dominant factor in calculating insulating effect.

2.Filling techniques may leave blocks improperly filled.

3.No vapor seal present - moisture infiltration decreases insulation effect.

4.If used for freezers, moisture will freeze inside block and break out the surface of the block.

5.Blocks are highly subject to setting cracks- more infiltration.

Table 3

Allowance for Sun Effect

(Fahrenheit degrees to be added to the normal temperature difference for heat leakage calculations to compensate for sun effect- not to be used for air conditioning design.)

Type of	East	South	West	Flat
Surface	Wall	Wall	Wall	Roof
Dark Colored Surfaces,
Such as:
Slate Roofing	8	5	8	20
Tar Roofing
Black Paints
Light Colored Surface,
Such as:
White Stone	4	2	4	9
Light Colored Cement
White Paint
Medium Colored Surface,
Such as:
Unpainted Wood
Brick	6	4	6	15
Red Tile
Dark Cement
Red, Gray or Green Paint

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