HRPQC-04 (7/04)
APPLICATIONS NOTE Quick Calculations Tables give typical and heavy load estimates based on the conditions in each room temperature table. Conditions include construction, loading, and room surroundings. If your conditions are very different from the typical or heavy conditions, then ?gure a load estimate speci?cally for your job. Here are three suggestions to help you get anaccurate load estimate for your application: a. You can use the paper and pencil calculation in Heatcraft Refrigeration Products Engineering Manual (H-ENG-1) b. You can use the box load software, in the Calculation Toolbox of the Cold Solutions Program provided by a Sales Representative c. Or you can call your Sales Representative for assistance
DIMENSIONS (FEET) W L H
ROOM AREA SQ. FT.ROOM BTUH BTUH VOLUME TYPICAL HEAVY CU. FT. LOAD LOAD
QUICK CALCULATIONS
WALK-IN COOLERS FREEZERS
BTUH LOADS for:
6’ X 6’ to 40’ X 40’ Rooms with 8’ Ceilings at -20ºF. to +35ºF. Based on 95ºF. Ambient
and for
© 2004, Heatcraft Refrigeration Products LLC
Before you do a, b, or c, get this information about your job: 1. Room information: • Length, width, and height of the box in feet •Temperature of the refrigerated room (°F.) • Relative humidity in the refrigerated room (if speci?ed) • Summertime design ambient temperature (°F.). This is usually the temperature expected at the location of an air cooled condensing unit which cools the room 2. Insulation information: • Type of insulation, insulation thickness (inches), and external temperatures on walls, ceiling, ?oor 3.In?ltration load information: • The temperature (°F.) of the entering air and the relative humidity of the entering air. Also, an estimate of the door usage – average, heavy, etc. • Does the box have glass doors? Dock doors? How many? 4. Product load information: • What is the product or product mix? • How many pounds of product entering at what temperature? • How long (hours) does it take to load the productinto the room? • How quickly (hours) should the room pull the product down to what temperature? • How many pounds of fruit and vegetables are in the room? (respiration load) 5. Miscellaneous loads information: • How many people work in the room? • What is the lighting (watts)? • How many motors (HP) do work in the room?
6 6 6 8 8 8 8 8 8 8 8 8 8 8 8 8 10 10 10 10 10 10 10 10 12 12 12 12 12 1214 14 14 14 16 16 16 18 18 18 20 20 20 20 20 20 40 40 40 40 40
6 8 10 8 10 12 14 16 18 20 22 24 26 28 30 32 10 12 14 16 18 20 24 28 12 14 16 18 20 22 14 16 20 24 16 20 24 18 20 24 20 24 28 32 36 40 24 28 32 36 40
8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8
36 48 60 64 80 96 112 128 144 160 176 192 208 224 240 256 100 120 140 160180 200 240 280 144 168 192 216 240 264 196 224 280 336 256 320 384 324 360 432 400 480 560 640 720 800 960 1120 1280 1440 1600
288 384 480 512 640 768 896 1024 1152 1280 1408 1536 1664 1792 1920 2048 800 960 1120 1280 1440 1600 1920 2240 1152 1344 1536 1728 1920 2112 1568 1792 2240 2688 2048 2560 3072 2592 2880 3456 3200 3840 4480 5120 5760 6400 7680 8960 10240 11520 12800
4522 5296 6020 61937032 7830 8597 9341 10065 11402 12097 12779 13451 14115 14770 15417 7980 8883 9752 11224 12045 12849 14413 15931 9887 11483 12423 13338 14235 15115 12547 13580 14587 15574 14704 17318 19416 17429 18592 20863 19842 22911 25289 28058 30347 33231 37745 42361 46722 51218 55479
6570 7390 8170 8360 9270 10140 10980 11790 12580 13800 14570 15320 16060 16800 17520 18240 10310 11300 12250 13630 1453015430 17170 18860 12410 13920 14970 15990 16990 17970 15110 16260 17520 18750 17530 20420 22800 20550 21870 24460 23300 26530 29260 32380 35020 38070 43290 48420 53490 58500 63460
(add 15% to loads for 10’ height)
Typical Load Conditions The Cold Solutions Program automatically ?gures typical loads. Here are the typical conditions: Product – In at +10°F. a) Speci?c heat of product is 0.45…