Heatcraft Refrigeration Products H-ENGM0408 - Manual (Page 11)

11
Refrigeration Load Estimate Form
(for rooms below 32ºF) Bulletin Below32-05
Estimate for:
Basis for Estimate
Room Dimensions: Width
ft. x Length ft. x Height ft.
Volume: (L) x (W) x (H) = cu. ft.
Ambient Temp ºF. (Corrected for sun load) — Room Temp. ºF. = ºF. T.D.
Product Load
(a) lbs./day of to be reduced from entering temp. of ºF.
to freezing point of ºF. (Table 7) = ºF. Initial temp. drop
and then reduced from freezing point to storage Temp. of ºF. = (Table 7) ºF. Final temp. drop.
(b) gallons of ice cream @ overrun
Miscellaneous
Motors (including all blower motors) HP Ground Temp. (Table 21)
Lights (assume 1 watt/sq.ft.) Watts
No. of People
2. Air Change Load
Volume: cu. ft. x Factor (Table 5) x Factor (Table 6) =
3. Additional Loads
Electrical Motors: HP x 75000 BTU/HP/24 hr. =
Electrical Lights: Watts x 82 =
People Load: People x BTU/24 hrs. (Table 12) =
Glass Door Load: Doors x 31200 BTU/Door/24 hr. =
4. Product Load: (Table 7) (Product Load Figured @ 24 hr. Pulldown*)
(a) lbs./day x Spec. Heat above freezing x ºF. Intial Temp. Drop =
lbs./day x Latent Heat Fusion =
lbs./day x Spec. Heat below freezing x ºF. Intial Temp. Drop =
(b) gallons of ice cream/day x BTU/gal (Table 19) =
*For product pulldown time other than 24 hrs. figure 24 hr. load x (24/Pulldown Time)
Divide by No. of Operating Hrs. (18) to obtain BTUH Cooling Requirement
Equipment Selection
Condensing Unit Unit Cooler System Capacity
Qty. Model No. Qty. Model No. BTU/hr.
Total Refrigeration Load (1+2+3+4+5) BTU/24 hrs.
Add 10% Safety Factor
Total with Safety/Factor BTU/24 hrs.
1. Transmission Loads
Ceiling: (L) x (W) x Heat Load (Table 1) =
North Wall: (L) x (W) x Heat Load (Table 1) =
South Wall: (L) x (W) x Heat Load (Table 1) =
East Wall: (L) x (W) x Heat Load (Table 1) =
West Wall: (L) x (W) x Heat Load (Table 1) =
Floor: (L) x (W) x Heat Load (Table 1) =
Estimate by: Date:
Insulation
Inches
Ceiling
Walls
Floor
Type
Note: Tables can be found in
Engineering Manual, H-ENG-2
2175 West Park Place Blvd. • Stone Mountain, GA 30087 • 770.465.5600 • Fax: 770.465.5990 • www.heatcraftrpd.com
(H)
(H)
(H)
(H)
Example: -10ºF Beef Freezer
20 24 12
24 20 12 5760
90 -10 100
4 Foamed In place Ure
4 Foamed In place Ure
4 Foamed In place Ure
3000 Beef 35
28 7
-10 38
— —
0.5 60
480
0
24 20 72 34560
24 12 72 20736
24 12 72 20736
20 12 72 17280
20 12 72 17280
24 20 50 24000
5760 5.2 3.56 106629
0.5 37500
480 39360
0 — —
0 —
3000 0.77 7 16170
3000 100 300000
3000 0.4 38 45600
— X 2.4 (10 hr. Pull down)* —
679851
67985
747836
41546
(W)
(W)