Heatcraft Refrigeration Products H-ENGM0408, H-ENGM0806 manual Example -10ºF Beef Freezer

Refrigeration Load Estimate Form

(for rooms below 32ºF) Bulletin Below32-05

Estimate for: Estimate by: Date:

Example: -10ºF Beef Freezer

Basis for Estimate

Room Dimensions: Width

20

Volume: (L) 24

Ambient Temp 90

	24	12			ft.
	ft. x Length	ft. x Height
x (W)20	12x (H)	5760	=		cu. ft.
ºF. (Corrected for sun load) — Room-10			Temp.	100	ºF. =

Note: Tables can be found in Engineering Manual, H-ENG-2

ºF. T.D.

		Insulation
	Inches	Type
Ceiling	4	Foamed In place Ure
Walls	4	Foamed In place Ure
Floor	4	Foamed In place Ure

Product Load
(a)	3000	lbs./dayBeefof	to be reduced from entering temp35. of			ºF.
to freezing point of28		ºF. (Table7 7) =	ºF. Initial temp. drop
and then reduced from freezing point to storage Temp. of			-10	ºF. = (Table 7)	38	ºF. Final temp. drop.
(b)	—	gallons of ice cream— @	overrun

Miscellaneous

Motors (including all blower motors)0.5 Lights (assume 1 watt/sq.ft.) 480 No. of People 0

HP	60
	Ground Temp.	(Table 21)
Watts

1. Transmission Loads
Ceiling: (L)24		x20(W)	x Heat72	Load	(Table 1)	34560	=
North Wall: (L)24		x12(H)	x Heat72	Load	(Table 1)	20736	=
	24	12	72			20736
South Wall: (L)		x (H)	x Heat Load		(Table 1)	17280	=
East Wall:	20	x12(H)	x Heat72	Load	(Table 1)		=
(W)		12	72			17280
	20
West Wall: (W)		x (H)	x Heat Load		(Table 1)	24000	=
	24	20	50
Floor: (L)		x (W)	x Heat Load		(Table 1)		=
2. Air Change Load
Volume:5760		cu. 5ft..2x	Factor 3(Table.56 5) x		Factor (Table 6) 106629		=

3.Additional Loads Electrical Motors:0.5 Electrical Lights:480 People Load: 0 Glass Door Load:0

HP x 75000 BTU/HP/24 hr. Watts x 82

People— xBTU/24 hrs. (Table 12) Doors x 31200 BTU/Door/24 hr.

37500 =

39360 =

—=

—=

4. Product Load: (Table 7) (Product Load Figured @ 24 hr. Pulldown*)				ºF. Intial16170Temp. Drop
(a)	3000	lbs./day0.x77	Spec. Heat above 7freezing x		=
	3000	lbs./day100x	Latent Heat Fusion	300000	=
	3000	lbs./day0x.4	Spec. Heat below38freezing x	ºF. Intial45600Temp. Drop	=

(b)	gallons of ice cream/day— x	BTU/galX 2.4(Table(10 hr19). Pull down)*	—	=
*For product pulldown time other than 24 hrs. figure 24 hr. load x (24/Pulldown Time)
Total Refrigeration Load (1+2+3+4+5) BTU/24 hrs.				679851
	Add 10% Safety Factor			67985
	Total with Safety/Factor BTU/24 hrs.			747836
Divide by No. of Operating Hrs. (18) to obtain BTUH Cooling Requirement				41546

		Equipment Selection
Condensing Unit			Unit Cooler	System Capacity
Qty.	Model No.	Qty.	Model No.	BTU/hr.

2175 West Park Place Blvd. • Stone Mountain, GA 30087 • 770.465.5600 • Fax: 770.465.5990 • www.heatcraftrpd.com

11