Engineering Manual o.. - HVAC.Amickracing

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PSYCHROMETRIC CHART FUNDAMENTALSREFERENCE POINT5000 3000 20001.00.80.60.50.41500SENSIBLETOTAL HEAT0.30.2HEAT0.1-0.1=∆H S-0.3∆H T-0.5-1.0-4.0-2.05001.02.04.0∞-10000THIS LINE ISPARALLELTO THE SOLIDLINE C-B ONTHE PSYCHCHARTENTHALPYHUMIDITY RATIO11501000=∆ h∆ WC50% RH0.0164 LB/LBAB0.0065 LB/LB55°F DB92°F DBXCONSTRUCTION LINEY90°F DBC1841Fig. 17.ENGINEERING MANUAL OF AUTOMATIC CONTROL 48
PSYCHROMETRIC CHART FUNDAMENTALSFigure 18 is the same as the chart shown in Figure 17 exceptthat it graphically displays the amount of heat added by theprocess. Enthalpy (total heat) added is determined bysubtracting the enthalpy of the dry, heated air at Point B fromthe enthalpy of the humidified air at Point C as follows:40.3 – 28.7 = 11.6 Btu per pound of dry airThe steam raised the temperature of the air from 90F dry bulbto 92F dry bulb. To find the latent heat added by the steamhumidifier to the air, determine the enthalpy at Point D (theenthalpy of the heated air without added moisture) and subtractit from the enthalpy of the humidified air at Point C. This isas follows:40.3 – 29.6 = 10.7 Btu per pound of dry airThe remaining 0.9 Btu is sensible heat. The actual moistureadded per pound of dry air is 0.0099 pounds. The specificvolume of the entering air at Point B is 14 cubic feet per pound.For a 10,000 cubic feet per minute system, the weight of theair passing through is:10,000 ÷ 14 = 714.3 pounds per minuteThe weight of the moisture added is:714.3 x 0.0099 = 7.07 pounds per minute of moistureSince one gallon of water weighs 8.34 pounds, the moisture tobe added is as follows:7.07 ÷ 8.34 = 0.848 gallons per minuteREFERENCE POINT5000 3000 20001.00.80.60.50.41500SENSIBLETOTAL HEAT0.30.2HEAT0.1-0.1=∆H S-0.3∆H T-0.5-1.0-4.0-2.05001.02.04.0∞-10000STEAMENTHALPY1150ENTHALPYHUMIDITY RATIO1000=∆ h∆ W40.3BTU/LBTOTALENTHALPYSENSIBLE(0.9 BTU/LB)29.6BTU/LBLATENTC50% RH0.0164 LB/LB28.7BTU/LBA 55°F DB 90°F DB B D 92°F DB0.0065 LB/LBC1842Fig. 18.ENGINEERING MANUAL OF AUTOMATIC CONTROL 49
Page 1 and 2: ENGINEERING MANUAL ofAUTOMATICCONTR
Page 3 and 4: Copyright 1934, 1940, 1953, 1988, 1
Page 5 and 6: PREFACEThe purpose of this manual i
Page 7 and 8: CONTROL FUNDAMENTALSElectronic Cont
Page 9 and 10: CONTROL FUNDAMENTALSDeviation—The
Page 11 and 12: CONTROL FUNDAMENTALSHVAC SYSTEM CHA
Page 13: CONTROL FUNDAMENTALSInfiltration is
Page 16 and 17: CONTROL FUNDAMENTALSROTATINGGRANULA
Page 18 and 19: CONTROL FUNDAMENTALS-PATHOFIONSAIRF
Page 20 and 21: CONTROL FUNDAMENTALSOPENFINALCONTRO
Page 22 and 23: CONTROL FUNDAMENTALSTIME PROPORTION
Page 24 and 25: CONTROL FUNDAMENTALSON“CLOSE”SW
Page 26 and 27: CONTROL FUNDAMENTALSOUTDOOR AIRTEMP
Page 28 and 29: CONTROL FUNDAMENTALSPROPORTIONAL-IN
Page 30 and 31: CONTROL FUNDAMENTALSCONTROLLERVALVE
Page 32 and 33: CONTROL FUNDAMENTALSIn terms of hea
Page 34 and 35: CONTROL FUNDAMENTALSFLAPPERSPRINGSI
Page 36 and 37: CONTROL FUNDAMENTALSimpact of the j
Page 38 and 39: CONTROL FUNDAMENTALSCHARACTERISTICS
Page 40 and 41: PSYCHROMETRIC CHART FUNDAMENTALSWAT
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Page 46 and 47: PSYCHROMETRIC CHART FUNDAMENTALS0°
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Page 54 and 55: PSYCHROMETRIC CHART FUNDAMENTALS90
Page 56 and 57: PSYCHROMETRIC CHART FUNDAMENTALSFig
Page 58 and 59: PNEUMATIC CONTROL FUNDAMENTALSMain
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Page 72 and 73: PNEUMATIC CONTROL FUNDAMENTALSFigur
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Page 96 and 97: ELECTRIC CONTROL FUNDAMENTALSSERIES
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ELECTRIC CONTROL FUNDAMENTALSLOW-LI
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ELECTRIC CONTROL FUNDAMENTALSCONTRO
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ELECTRIC CONTROL FUNDAMENTALSSERIES
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ELECTRIC CONTROL FUNDAMENTALSOPERAT
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ELECTRIC CONTROL FUNDAMENTALSBRIDGE
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ELECTRIC CONTROL FUNDAMENTALSTWO-PO
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ELECTRIC CONTROL FUNDAMENTALSA 135-
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ELECTRIC CONTROL FUNDAMENTALSMOMENT
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ELECTRONIC CONTROL FUNDAMENTALSINTR
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ELECTRONIC CONTROL FUNDAMENTALSTYPI
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ELECTRONIC CONTROL FUNDAMENTALSAnot
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ELECTRONIC CONTROL FUNDAMENTALSWIRE
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ELECTRONIC CONTROL FUNDAMENTALSTemp
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ELECTRONIC CONTROL FUNDAMENTALSTYPI
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MICROPROCESSOR-BASED/DDC FUNDAMENTA
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INDOOR AIR QUALITY FUNDAMENTALSINTR
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INDOOR AIR QUALITY FUNDAMENTALSRado
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INDOOR AIR QUALITY FUNDAMENTALSTabl
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INDOOR AIR QUALITY FUNDAMENTALSHEAL
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INDOOR AIR QUALITY FUNDAMENTALSPass
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INDOOR AIR QUALITY FUNDAMENTALSThis
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INDOOR AIR QUALITY FUNDAMENTALSEnvi
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INDOOR AIR QUALITY FUNDAMENTALSFLOW
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INDOOR AIR QUALITY FUNDAMENTALSROOF
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INDOOR AIR QUALITY FUNDAMENTALSFigu
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SMOKE MANAGEMENT FUNDAMENTALSINTROD
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SMOKE MANAGEMENT FUNDAMENTALSAny al
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SMOKE MANAGEMENT FUNDAMENTALSThe bu
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SMOKE MANAGEMENT FUNDAMENTALSThe do
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SMOKE MANAGEMENT FUNDAMENTALSAnothe
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SMOKE MANAGEMENT FUNDAMENTALSBIBLIO
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BUILDING MANAGEMENT SYSTEM FUNDAMEN
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AIR HANDLING SYSTEM CONTROL APPLICA
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INDIVIDUAL ROOM CONTROL APPLICATION
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VALVE SELECTION AND SIZINGVALVE SEL
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LINE PRESSURE IN PSIVALVE SELECTION
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VALVE SELECTION AND SIZINGVALVE MAT
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VALVE SELECTION AND SIZINGWhen butt
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VALVE SELECTION AND SIZING— Graph
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VALVE SELECTION AND SIZINGPRESSURE
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VALVE SELECTION AND SIZING3640.443.
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VALVE SELECTION AND SIZINGQUANTITY
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VALVE SELECTION AND SIZINGThe criti
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VALVE SELECTION AND SIZINGTable 5.
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DAMPER SELECTION AND SIZINGDAMPER S
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DAMPER SELECTION AND SIZINGIn a low
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DAMPER SELECTION AND SIZINGFor typi
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DAMPER SELECTION AND SIZINGTORQUE R
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DAMPER SELECTION AND SIZINGwhen eit
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DAMPER SELECTION AND SIZINGStabilit
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DAMPER SELECTION AND SIZINGTable 4.
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DAMPER SELECTION AND SIZINGLOUVERSO
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GENERAL ENGINEERING DATAHEATING DAT
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GENERAL ENGINEERING DATACONVERSION
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GENERAL ENGINEERING DATAVOLUMEExist
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GENERAL ENGINEERING DATAHEAT TRANSF
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GENERAL ENGINEERING DATAFORCEEXAMPL
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GENERAL ENGINEERING DATATHREE-PHASE
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GENERAL ENGINEERING DATACONDUIT SIZ
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GENERAL ENGINEERING DATAVOLTAGE CON
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GENERAL ENGINEERING DATAAIRFLOW DAT
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GENERAL ENGINEERING DATAMOISTURE CO
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GENERAL ENGINEERING DATAENGINEERING
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GENERAL ENGINEERING DATAASHRAEGuide
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GENERAL ENGINEERING DATACooling Tow
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GENERAL ENGINEERING DATAFlame Safeg
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GENERAL ENGINEERING DATAOperationSe
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GENERAL ENGINEERING DATASeries 40Co
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GENERAL ENGINEERING DATAValve Contr
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