Document gDKz8pxBGMeZX33nmVMYy3pXq

0m* g[YlR PROWS out HEATING AND AIR CONDITIONING Industrial process Ventilation, by William N Witheridge, General Motor$ Corp. This paper discusses "the special branch ol air conditioning dealing with mechanical and chemical control of air contaminants traceable to Industrial processes." The author classifies methods ol process ventilation and illustrates some. Fig. 2. In addition there are comments on general and local ventilation, meth ods of reinforcing 'ventilation rates, successive ventilation systems and short circuits in air movements. Fig. 1 shows the way flanges and baffles increase tone ol influence ol exhaust openings. ASHVE Journal. Dee 1947. A Now Method for Selecting Winter Design Temperatures, by Clark M Humphreys, American Society of Heat ing and Ventilating Engineers Research Labs. Heating systems are designed-to maintain a given temperature inside a building when the temperature is at aoraa low point previously experienced a number of rimes, but not so low os the lowest temperature of record. Gener ally, design temperature for a locality Is based on experience with no consist ent pattern for selection. The author feels outside design temperature is too important to be de termined by rule of thumb. This tem perature should indicate, with fair accuracy, the lowest temperature likely to prevail long enough or often enough to justify consideration. A table of frequency of occurrence of low temperatures for 120 cities was given as the basis for selecting design temperature. A further suggestion called for designing beating systems on the under side rather than oversixing them. This gives better control, lower first cost, more efficient operation. ASHVE Paper. (5ea p ISO for instruc tions on ordering paper.) Uso of Climatological Data in Keating and Cooling Design, by H E Landsberg, director. Committee of Geo physical Sciences, Joint Research and Development Board, Washington, D. C. Normal weather data should not be interpreted at applying to usual condi tions, which are much leas important than frequency distribution of data. For instance, usual winter design temperature in Washington, D. C. is sero degrees F. This temperature has occurred only three times in A design temperature of 10 p take care of 99.9% of oil tuaet Heating engineers should buffi mind that in hilly country matic differences within a few quite important. Suburban area^tS perature can differ as much as B deafl F from that at metropolitan wtnsfl elation*. ASHVE Paper. An Improved Test Method for [ Air Filters, by R S Farr, W N Psaf^fl K A Crismon, Los Angeles, CctyM Manufacturers should furnish us* formsnee curves containing complrfl families of curves for buyers siTffl filters, in the opinion of the In addition, they advance requimniatjj of on air-filter tearing method sod tl propose a test code. A good testing method erabe&ff eliminating the variables other thu \3m dusts. The authors developed a t duct, dust feeder and dust umpiej which allows test dust to be evenly dCT tributed withio ri=5% and the velocity within IS to 20%. SimuUmSj ous dust sampling is used. All test data should be ploited[aS full. Only complete curves ot Uo&m of curves at various velocities, or taj data using various specified dagy ENGINEERING* In planning your insulation job, first 'call in an experienced insulation engineer. Johns^Mioville ... Insulation Headquarters for more than , 7) years . . , maintains a staff of insulation expens. ;;Eicb mao knows how to take the guesswork out of ,'j^j your job .. . make it "right thefirst time." RIGHT INSULATION! Aayinsulation will save money --but only the right one will save the most for the longest period of time. J-M 85% Magoesls it the most widely used of all industrial Insulating materials ,., and one of a wide range of J-M insulations-for every service and temperature. Updraftor canopy A hood (Hot-process servlet) Booth ventrfotfoo (Spray**. gritditim HL Sidedfoft or bockdroH hood Cvstom-detfpn hood BS$ 1, above. Hero are four flange ond baffle arrangements to increase the zone of influence. 2, right. Six methods for ventilating industrial processes to remove the waste fumes 128 (2S0) Downdraft orpride hood Leterof or stot esheutt Cl (rank service) P POWER* April 'fjjj & CORRECTAPPLICATION! No insulation is berterthsn 5. tbs man who installs it. J-M Insulation Applicators , 'y` ve industry's first choice forcompletely efficient /oba because'. (1) They ate trained in all phosesoflnsutation sppticatioa; (2) They employ skilled mechanics and SC uiMo-date application methods. You can rely on them 05 TEARS TQIINQI J-M 85% Magnesia was applied to pipes of the Eclipse Mill Company, Everett, Wash ington, back in 1912. Because this job was engineered . right and applied right, it is still providing dependable SSI insulation .. . still keeping fuel costs low. Get expert help wlth/ser insulation problem by wrltlog toJohns* ManviUe, Box 290, New York 16, N. Y.