Document Z4b0gqq0J85RnG9J40Jw5oL9V

HEATING VENTILATINC AIR CONDITIONING GUIDE 1940 Table 10. Heat Gain from Various Sources . . Source Btu Per Hour Sensible J Latent j Total Electric Healing Equipment Electrical Equipment--Dry Heat- -No Evaporated Water___ __ Electric Oven--Baking. Electric Equipment--Hearing 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. IS in. Diameter--Single Drum Coffee Urn--Small. 12 in. Diameter--Single Drunu Coffee Urn--Approx. Connected Load per Gallon of CapacityElectric 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 Volume-------------Frying Griddles--Per Square Foot of Top SurfaceHot 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 0% 2000 1200 600 .* * 8000 ` 1025 300 850 3200 * * 2050 2050 o% 20% 50% 0 0 0 10% 2000 1200 600 * * 2000 0 800 0 1300 * * 0 0 100% 100% 100% 3.4 3413 2546 100% 4000 2400 1200 3400 7500 10000 1025 1100 850 4500 4600 9000 2050 2050 Gas Burning Equipment Gas Equipment--Dry Heat--No Water Evaporated----- .------------------------------------ 90% Gas Heated Oven--Baking------------..........-------------------------.---------------------------------- 67% Gas Equipment--Heating Water--Stewing, Boiling, etc--------------------------- ------- 50% Stove. Domestic Type--No Water Evaporated--Per Medium Size Burner-------- 9000 Gas Heated Oven---Domestic Type-------------------------------------------------------- ----- 12000 Stove. Domestic Type--Hearing Water--Per Medium Size Burner-------------------Residence Gas Range--Giant Burner (About SH fa* 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...------- --------------------------------- ---........... Simmering Burner............ ------------------------ ---------------------------------------------------- *-- 5000 * * * * * * * Coffee Urn--Large. 18 in. Diameter--Single Drum....................... ............................. 5000 Coffee Urn--Small, 12 in. Diameter--Single Drum.--------------------- ----------------........ 3000 Coffee Urn--Per Gallon of Rated Capacity------------- --------------------- ------.............. 500 Egg Boiler--Per Egg Compartment.............................. --........... ..................--.....---: 2500 Steam Table or Serving Table--Per Square Foot of Top Surface-- --............... , 400 Dish Warmer--Per Square Foot of Shelf.------------------------*.......... ............. ........------- 540 Cigar Lighter--Continuous Flame Type........ ----------------........... :.............................. 2250 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........................... ........----- ------------............. 2250 * * \ * * * * Lighting Fixture Outlet--Large, 3 Mantle 480 C-P------------------------------------------- 4500 Lighting Fixture Outlet--Small, 1 Mantle 160 C.P..--...................--.......... .............. 2250 One Cubic Foot of Natural Gas Generates----------------------------------------------------- ---- 900 One Cubic Foot of Artificial Gas Generates------------------------------ -------------------------- 540 One Cubic Foot of Producer Gas Generates--------------------------------------------------- -- 135 10% 33% 50% 1000 6000 5000 * * * * *' * 5000 3000 500 2500 900 60 250 250 * * * * * 0 0 0 500 250 100 60 15 100% 100% 100% 10000 18000 10000 12000 10000 18000 250 100000 100 250 2500 10000 6000 1000 5000 1300 600 2500 2500 5000 3000 3000 1800 3000 1800 5000 3000 5000 2500 1000 600 150 ___________ Steam Healed Equipment Steam Heated Surface Not Polished--Per Square Foot of Surface.-- Steam Heated Surface Polished--Per Square Foot of Surface-............ . Insulated Surface. Per Square Foot................................................. Bare Pipes. Not Polished Per Square Foot of Surface.------------Bare Pipes. Polished Per Square Foot of Surface.------------------Insulated Pipes. Per Square Foot....................... .............................. Coffee Urn--Large, 18 in. Diameter--Single Drum---------------------- ----Coffee Urn--Small, 12 in. Diameter--Single Drum--.............. -.......-- Egg Boiler--Per Egg Compartment.............--............... -........... -....... -- Steam Table--Per Square Foot of Top Surface..................... --................ 330 130 80 400 220 110 2000 1200 2500 300 0 0 0 0 0 0 2000 1200 2500 800 330 130 80 400 220 no 4000 . 2400 5000 1100 Miscellaneous Heat Liberated from Hot Water used direct and on towels per hour--Barber Shops 30 100 30 I 200 1 60 300 Per cent sensible and latent heat depends upon use of equipment; dry heat, baiting or boiling. 152 CHAPTER 8. COOLING LOAD Heat Emission of Appliances Heat generating appliances which give off either sensible heat or both . sensible and latent heat in an air conditioned enclosure may be divided into three general classes of equipment or devices: 1. Electrical appliances. 2. Gas appliances. 3. Steam heating appliances. In the first group may be found such devices as lights, motors, toasters, waffle irons, etc. The capacities of most electrical devices may be determined from the watt capacity indicated on their name plates. The Btu equivalent of heat generated per hour is determined by multi plying the watt capacity by 3.4 (one watthour is equivalent to 3.413 Btu). The capacities of electric motors are usually expressed in terms of horsepower instead of watts. If the motor efficiency is known, the watts input may be calculated from the formula: where p = 746 (hp) n P = motor'input, watts. hp = motor load, horsepower. n = motor efficiency (expressed as a decimal). '' When the motor efficiency is not known the heat equivalent of electrical input can be approximately determined by applying data given in Table 9. Table 9. Heat Generated by Motors Nameplate Rating Horsepower Hto 3^ H to 3 3 to 20 Heat Gain in Btu per Hour per Horsepower Connected Load in Same Room Connected Load Outside of Room 4250 3700 2950 1700 1150 400 In the second group belong such appliances as coffee urns, gas ranges, steam tables, broilers, hot plates, etc. For heat generating capacities of such appliances refer to Table 10. Considerable judgment must be exercised in the use of data given in Table 10. Consideration must be given to time of day when appliances are used and the heat they contribute at time of peak load. Only those appliances in use at the time of the peak load need be considered. Con sideration must also be given to the way appliances are installed, whether products of combustion are vented to a flue, whether they escape into the space to be conditioned, or whether appliances are hooded allowing part of the heat to escape through a stack. There are no generally accepted data available on the effects of venting and shielding heating appliances but it is believed that when they are properly hooded with a positive fan exhaust system through the hood that 50 per cent of the heat will be 153