Question

4 pts)_1-ALGIVEN: Steam Tables and "Psych Chart" for atmospheric air at std. atm. pressure LET: DB dry bulb temperature DP dew point temperature CIRCLE THE BEST ANSWER a) A constant humidity ratio process will have approximately constant b) The relative humidity value can be determined given humidity ratio and DB DP c) The mol fraction of H:0 vapor in air at std. pressure can be found given just DB DP d) The mixture enthalpy value can be determined given humidity ratio and DP Both True Neith Both True Neither Both True Neither DB DP Both True Neither CIRCLE THE BEST "TRUE" ANSWER /3 pts)_1-B) Given atmospheric air at the central point shown below LET: DP dew point temperature HR-humidity ratio RH - relative humidity VP - vapor pressure >>Adding moisture while holding the dry bulb temperature constant will increase DP HR RH VP (AD None DP HR RH VP All None >> Simple heat addition to raise the dry bulb temperature will decrease >>Adding moisture while the air mixture enthalpy is held constant will increase DP HR RH VP All None CIRCLE THE BEST "TRUE" ANSWER /3 pts)_1-B) Given atmospheric air at the central point shown below For Patm 101 kPa and the atmospheric air initially at the central point An HVAC process begins at the central point following a path that decreases the dry bulb temperature but maintains a constant moisture level. No H20 is added or remov <xx The correct point >> The process path moves toward point A B C DE F G An HVAC process begins at the central point following a path that adds liquid by evaporation without external heat transfer (adiabatic, constant enthalpy). L. <<< The correct point C DEFGH >> The process path moves toward point A) B >> Clearly draw the process path on the diagram for an HVAC process starting at point (b) and ending at the central point using only thermal heating/cooling and thermal evaporation/consensation processes D20 010 016 014 HR 012 010 008 004 002 40 50 10 20 30 Dry bulb temperature, c Please read each problem at least 2 times to identify mass, energy, entropy and property data

Answer 1

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