Resources - Heatcraft Worldwide Refrigeration

1 Resources -10 F to 0 F Reach-insQuick Load CalculationsApplications NoteHere are three suggestions to get an accurate load estimate for your specific application:1. Utilize the Heatcraft ProSelect Contact your local Sales Representative for Utilize the paper and pencil calculation in Heatcraft s Engineering Manual (H-ENGM0408).Room Conditions for Loads Shown in the Quick Calculations TableFOR 35 F LOAD CALCULATIONThe calculation is for a product entering a room during a 24 hour period. The amount of entering hot product (pounds) is twice the room volume (cu ft). The entering product temp is 40 F. The product temp is reduced to 35 in 24 hours. The specific heat of the product is BTU per pound. The freezing temp of the product is 27 .The insulation in the ceiling and walls is 4 of styrofoam.

2 The ceiling temp is 115 , solar effect. The wall temperatures are 95 . The R value for the styrofoam is , the k factor is The floor is 6 of concrete on grade. The floor temp is 55 . The R value of the concrete is , the k factor is Air enters through the door at 95 and 50% relative humidity. The door openings cause TWICE number of air changes listed in tables that estimate AVERAGE AIR CHANGES FOR STORAGE ROOMS . Table 4, page 14, Heatcraft Engineering Manual (H-ENGM0408). The motor load is charged at 1 HP per 16,000 CU FT of room volume. The lighting load is 1 watt per SQ FT of floor area. The people load is figured at 1 person per 25,000 CU FT of room 10% safety factor is added to the product, wall transmission, door infiltration, and miscellaneous loads is based on SIXTEEN hour runtime.

3 The BTU load for 24 hours is divided by 16 hours to yield the hourly heat 30 , 0 , -10 , -20 F. LOAD CALCULATIONSFor Heavy Load Conditions: People load is 1 person. Pounds of product is 3 times the rooms cubic Foot box height load estimates: Add 15% to the loads listed for 8 Walk-in Coolers & FreezersLoads based on continuous operation and include allowances for avg. number of personnel, processing equipment, etc., with glass panel in one wall and walls and ceilings insulated with 3 inches of styrene, with boxlocated in air conditioned area. Evaporator should below outlet velocity type to avoid drafts and should be selected for continuous operation and not less than 30 F evaporator on a minimum 1 inch urethane foam insulated fixture, 16 hours per daycompressor run door loads have been adjusted for run time load.

4 Multiply number of doors bythe door load listed and add to hourly heat load in the table of quick on a minimum 1-1/2 inch urethane foam insulated fixture, 18 hours per day compressor run Tables For Special Rooms or Boxes & ConditionsThe Quick Calculations Table gives Typical and Heavy load estimates BASED on the conditions for each room temperature. Conditions include construction, loading, and room surroundings. IF your conditions are very DIFFERENT from the Typical or Heavy conditions, then figure a load estimate specifically for your calculation is for a product entering a room during a 24 hour period. The amount of entering hot product (pounds) EQUALS the room volume (cu ft). The entering product temp is 10 F warmer than the room temp. The product temp is reduced to the room temp in 24 hours.

5 The specific heat of the product is BTU per pound for the 30 room. The specific heat of the product is BTU per pound for the 0 , -10 , and -20 rooms. The freezing temp of the product is 27 .The insulation in the ceiling, walls, AND FLOOR is 4 of URETHANE. The ceiling temp is 115 , solar effect. The wall temperatures are 95 . The R value for the urethane is 25, the k factor is The floor temp is 55 .Air enters through the door at 95 and 50% relative humidity. The door openings cause TWICE number of air changes listed in tables that estimate AVERAGE AIR CHANGES FOR STORAGE ROOMS . Table 5, page 14, Heatcraft Engineering Manual (H-ENGM0408). The motor load is charged at 1 HP per 12,500 CU FT of room volume. The lighting load is 1 watt per SQ FT of floor area.

6 The people load is figured at 1 person per 25,000 CU FT of room 10% safety factor is added to the product, wall transmission, door infiltration, and miscellaneous loads is based on a EIGHTEEN hour runtime. The BTU for 24 hours is divided by 18 hours to yield the hourly heat Volume CU FTApprox BTUH4- 10100011 - 18135019 - 35190036 - 55290056 - 75420076 - 1005500 Floor Square FeetBTUH per sq. ft. of Floor Area55 F50 F100931052008899300859540081905007887600 7585700728180069789006775100065731200626 9 Room Volume CU FTApprox BTUH4- 10950-115011 - 181100-130019 - 35210036 - 55260056 - 75350076 - 1005700 Meat Cutting / Prep Room35 F to 40 F Reach-insReach-in Glass Door LoadsRoom per Door+35 F1060+30 F9600 F1730-10 F1730-20 F1730 ResourcesTable of Quick Calculations in BTUHB ased on 95 F ambient.

7 Add 15% to loads for 10 Load CalculationsFor Walk-in Coolers & FreezersRoom Dimensions (in.)Room Area (Sq FT)Room Volume (CU FT)+35 F Room+30 F Room0 F Room-10 F Room-20 F RoomWLHT ypical Load (BTUH)Heavy Load (BTUH)Typical Load (BTUH)Heavy Load (BTUH)Typical Load (BTUH)Heavy Load (BTUH)Typical Load (BTUH)Heavy Load (BTUH)Typical Load (BTUH)Heavy Load (BTUH)668362884,9866,5403,4835,1904,5226 ,5704,8597,0705,1877,570688483845,8847,4 704,0955,9105,2967,3905,6927,9606,0768,5 106108604806,7298,3504,6686,5906,0208,17 08,57310,8906,9089,390888645126,9398,570 4,8126,7606,1938,3606,6548,9907,1049,610 8108806407,9349,6005,4857,5807,0329,2707 ,5559,9608,06610,6408128967688,88710,590 6,1268,3607,83010,1408,41310,8908,98211, 62081481128969,80811,5506,7449,1208,5971 0,9809,23911,7909,86512,58081681281,0241 0,62612,4107,3439,8609,34111,79010,03912 ,66010,72013,50081881441,15211,58113,410 7,92710,58010,06512,58010,81813,51011,55 314,41082081601,28012,58814,3109,07811,7 4011,40213,80012,22514,78013,03115,73082 281761,40813,43415,1909,63912,44012,0971 4,57012,97315,60013,83016,60082481921,53 614,26716,06010,19213,13012,77915,32013, 70816,40014,61717.

8 46082682081,66415,58517,42010,73613,8201 3,45116,06014,43217,20015,39218,31082882 241,79216,39818,27011,27314,49014,11516, 80015,14617,98016,15619,14083082401,9201 7,20319,12011,80415,17014,77017,52015,85 118,76016,91219,97083282562,04818,00119, 96012,33015,83015,41718,24016,54919,5201 7,65920,780101081008009,07210,7906,2528, 5207,98010,3108,57311,0709,15211,8101012 812096010,16411,9306,9849,4308,88311,300 9,54312,13010,18712,940101481401,12011,2 2113,0407,69110,3109,75212,25010,47713,1 5011,18514,020101681601,28012,39814,1208 ,95611,61011,22413,63012,02814,58012,815 15,520101881801,44013,40615,1709,62612,4 6012,04514,53012,91115,55013,75816,55010 2082001,60014,89016,71010,28213,29012,84 915,43013,77516,50014,68217,560102482401 ,92016,82318,74011,56014,92014,41317,170 15,45718,36016,48019,530102882802,24018, 70920,72012,80416,52015,93118,86017,0902 0,17018,22721,460121281441,15211,39113,2 207,80510,4609,88712,41010,62113,31011,3 3814,190121481681,34412,72814,4709,17711 ,91011,48313,92012,30514,89013,10815,850 121681921,53613,88715,6809,94812,89012,4 2314,97013,31416,01014,18517,03012188216 1,72815,51817,37010,70013,85013,33815,99 014,29717,10015,23618,180122082401,92016 ,63318,55011,43814,80014,23516,99015,260 18,16016,24619,300122282642,11217,73219, 71012,16415,74015,11517,97016,20619,2201 7,27420,430141481961,56814,04615,85010,0 5413,03012,54715,11013,44616,16014,32617 ,190141682241,79215,82817,70010,90714,13 013,58016,26014,55417,39015,50918,490142 082802,24018,32920,34012,56016,27014,587 17,52016,69619,78017,79521,030142483362, 68820,75622,91014,59718,80015.

9 57418,75019,20222,53020,44123,9201616825 62,04817,24019,20011,84215,34014,70417,5 3015,76118,74016,79519,920162083202,5601 9,98722,10014,09318,16017,31820,42018,53 321,79029,12432,530162483843,07222,65624 ,93015,84620,48019,41622,80020,78624,320 22,12925,820181883242,59220,13222,26014, 18918,29017,42920,55018,65221,93019,8502 3,270182083602,88021,61523,83015,16419,5 8018,59221,87019,90023,33021,18224,76018 2484323,45625,01827,41017,07122,12020,86 324,46022,33626,09023,78127,680202084003 ,20023,71326,03016,21620,99019,84223,300 21,24024,85022,61126,370202484803,84027, 00529,37018,85424,19022,91126,53024,5032 8,26026,06629,950202885604,48030,08432,6 5022,10828,15025,28929,26027,05431,16028 ,78833,030203286405,12033,60836,37023,27 730,02028,05832,38029,99334,45031,89436, 490203687205,76036,59539,55025,21932,670 30,34735,02032,44937,26034,51639,4602040 88006,40040,19043,20027,71435,73033,2313 8,07035,51540,47037,76242,840402489607,6 8045,63349,04031,68141,10037,74543,29040 ,31645,98042,48748,270402881,1208,96051, 62855,28035,72146,41042,36148,42045,2325 1,39048,05954,320403281,28010,24057,4086 1,46039,57051,67046,72253,49049,87056,73 052,97359,940403681,44011,52063,27867,58 043,51656,88051,21858,50054,65662,02058, 04765,490404081,60012,80068,95473,65047, 28962,06055,47963,46059,18667,25062,8487 1,000