Document pBgNkJzo4jaVGeDnykam6aOKD

Heating Ventilating Air Conditioning Guide 1939 Table 10. Heat Gain from Various Sources Source Btc Per Hour Sensible Latent | Total Electric Heating Equipment Electrical Equipment--Dry HeatElectric Oven--Baking-------------- --------------------------------------------Electric Equipment--Heating Water--Stewing, Boiling, etc-- Electric Lights and Appliances per Watt (Dry Heat)------------- Electric Lights and Appliances per Kilowatt (Dry Heat)-------Electric Motors per Horsepower... Electric Toasters or Electric Griddles....... ................ _ Coffee Urn--Large. 18 in. Diameter--Single DrumTM Coffee Urn--Small. 12 in. Diameter--Single Drum__ Coffee Urn--Approx. Connected Load per Gallon of CapacityTM Electric Range--Small Burner_____________ _____ ______________ Electric Range--Large Burner___ ________________ ________ -- Electric Range--Oven.... ................ .................... ............. .................... Electric Range--Warming Compartment......... ............................. Steam Table--Per Square Foot of Top Surface________________ Plate Warmer--Per Cubic Foot of Volume___________ ________ Baker's Oven--Per Cubic Foot of VolumeFrying Griddles--Per Square Foot of Top Surface____ Hot Plates--Per Square Foot of Top Surface.... ............. Hair Dryer in Beauty Parlor--600 w_ Permanent Wave Machine in Beauty Parlor--24-25 w Units_______ 100% 80% 50% 3.4 3413 2546 80% 2000 1200 600 * * 8000 1025 300 850 3200 * * 2050 2050 0% 20% 50% 0 0 0 10% 2000 1200 600 * * 2000 0 800 0 1300 * * 0 0 Gas Burning Equipment Gas Equipment--Dry Heat--No Water Evaporated .. - -.......... Gas Equipment--Heating Water--Stewing, Boiling, etc........ ....... ..................... Stove. Domestic Type--No Water Evaporated--Per Medium Size Burner--__ Gas Heated Oven--Domestic Type ........................................... .... .. ........... _ Stove. Domestic Type--Heating Water--Per Medium Size Burner. .............. Residence Gas Range--1Giant Burner (About 5)^ in. Diameter)-- .............. Residence Gas Range--Medium Burner (About 4 in. Diameter).............................. Residence Gas Range--Double Oven (Total Size 18 in. x 18 in: x 22 in. High)____ Residence Gas Range--Pilot................................ ............................ --................ Restaurant Range--4 Burners and Oven. ................. ............................................. Cast-Iron Burner--Low Flame--Per Hole....................................................................... Cast-Iron Burner--High Flame--Per Hole................... - ....... .................................... Coffee Urn--Large, 18 in. Diameter--Single Drum................................................... Coffee Urn--Small, 12 in. Diameter--Single Drum Coffee Urn--Per Gallon of Rated Capacity................ -............................................... Egg Boiler--Per Egg Compartment................................ -............................................ Steam Table or Serving Table--Per Square Foot of Top Surface........................... Dish Warmer--Per Square Foot of Shelf.... .......................................................... ...... Cigar Lighter--Continuous Flame Type................................... ........................... ...... Curling Iron Heater' ......................................................................................................... Bunsen Type Burner--Large---Natural Gas................... -................. ..................... Bunsen Type Burner--Large--Artificial Gas.................................................................. Bunsen Type Burner--Small--Natural Gas........... ........................................ ................ Bunsen Type Burner--Small--Artificial Gas................................................................ Welsbach Burner--Natural Gas........... _.................... -.................-............................. Welsbach Burner--Artificial Gas........................................................................................ Fish-tail Burner--Natural Gas........................................ ................................. ?.......... Fish-tail Burner--Artificial Gas.......................................................................................... Lighting Fixture Outlet--Large, 3 Mantle 480 C.Px............................................... Lighting Fixture Outlet--Small, 1 Mantle 160 C.P........................... ......................... One Cubic Foot of Natural Gas Generates.....................................................-............... One Cubic Foot of Artificial Gas Generates.......................................... ..................... One Cubic Foot of Producer Gas Generates......... .............. .................... -____ ____ 90% 67% 50% 9000 12000 5000 * * * * * * 5000 3000 500 2500 400 540 2250 2250 -* * * * * * * _ 4500 2250 900 540 135 10% 33% o% 1000 6000 5000 * * ;* * * * * * 5000 3000 500 2500 900 60 250 250 * *. * * * * * * 500 250 100 60 15 100% 100% 10000 18000 10000 12000 10000 18000 250 100000 100 250 10000 6000 1000 5000 1300 600 2500 2500 5000 3000 3000 1800 3000. 1800 5000 3000 . 5000 2500 1000 600 150 Steam Heated Equipment Steam Table--Per Square Foot of Top Surface.................................................. ......... 330 130 80 400 220* 110 2000 1200 2500 300 0 o 0 0 0 0 2000 1200 2500 800 330 130 80 400 220 110 4000 2400 5000 1100 Miscellaneous. Heat Liberated from Hot Water used direct and on towels per hour--Barber Shops 11 13000 30 200 GO 300 *Per cent sensible and latent heat depends upon use of equipment; dry heat, baking or boiling. TaCbolens1i0d.eraCbolensjuiddegrmateionnt mmuusstt bbeegeivxerncistoedtiminethoef u<w> n.!.if.13 gl.ven ln are used and the heat they contribute to the space at app.`nces Only those appliances in use at the time of the nealr load f oad' sidered. Consideration must also be given to tho n?:d *3e con' installed, whether products of combustion are vented tLT ,are products of combustion escape into the space to be rond/tL* j e' w,hether appliances are hooded allowing part of the heat to^ 10ned f whether stack connected with the hood There arenovLl f,SCape throuSh a available on the effects of venting and shielding heatinlL^9^^^ iasvabaceikllaiebcvoleendioicntih..t.ah--te we--fhfeecntsthoef vaepnptliinagncaensdasremperiaompegrnlyehaouo,,dsed with a p,,o_s_i_ti_ve fan exhaust system through the hood that 50 per cent o'f the heat w-i'llll Kbe* conveyed up into the hood and the balance of 50 per cent will be dissipated the space to be conditioned. Where latent as well as sensible heat is m" safe to assume that all latent heat will be removed 'A GENERAL From the foregoing discussion it is obvious that the determination of the maximum cooling load is rather complicated by reason of the variable nature of contributing load components. If the time when the maximum load occurs is'not obvious the load should be calculated for various times of the day to determine the probable time at which the sum of the various component loads is a maximum. Application of the foregoing data in determining cooling load require ments is illustrated in Example 1. Example 1. Determine cooling toad requirements for a clothing store illustrated in Fig. 3 and located in Cleveland, Ohio, Latitude 40 deg. This is a one-story building located on a corner and it faces south and west. Assume building on east and north sides conditioned. Wall construction, 8 in. hollow tile, 4 in. brick veneer, plaster on walls, U = 0.33 (Table 4, Wall 38 B, Chapter 5). Roof construction, 2 in. concrete, V't in. rigid insulation, metal lath and plaster ceiling, U = 0.26 (Table 11, Wall 2 J, Chapter 5). Floor, maple flooring on yellow pine, no ceiling below, U = 0.34 (Table 8, Wall 1 D, Chapter 5). Partition, wood lath and plaster on both sides of studding, U = 0.34 (Table 6, Wall 77 B, Chapter 5). Show windows, provided with awnings and thin panel partition at rear. Front doors, 2 ft 6 in. x7 ft (glass paneled), U = 1.13 (Table. 13 A, Chapter 5). Side door, 3 ft x 7 ft (solid, 1% in. thick), U = 0.51 (Table 13 B, Chapter 5). Occupancy, 10 clerks, 40 patrons. Lights, 4200 w. Outside design conditions, dry-bulb 95 F; wet-bulb 75 F. Inside design conditions, dry-bulb 80 F; wet-bulb 67 F. Basement temperature, 85 F. Store room temperature, 88 F. * 159