Term 1: Thermodynamics and Humidity Concepts, Quizzes of Production and Operations Management

Download Term 1: Thermodynamics and Humidity Concepts and more Quizzes Production and Operations Management in PDF only on Docsity! TERM 1 Absolute Humidity (AH) DEFINITION 1 The amount of moisture suspended in a pound of dry air. AH= lbs of moisture per lb of dry airThe hotter the air the greater its volume TERM 2 Saturation DEFINITION 2 When air contains as much moisture as it can hold. The higher the temp the more moisture air can hold. TERM 3 Relative Humidity (RH) DEFINITION 3 The degree of saturation expressed as a percent. i.e RH=50% means that the air air contains half the amount of moisture it can hold when its saturated. RH=100% means that the air is saturated. Vapor Pressure at any %RH = (vapor pressure at saturation)*(%RH) TERM 4 Dry Bulb Temperature DEFINITION 4 The temp read directly off a normal thermometer. (bulb at bottom kept dry on thermometer) TERM 5 Wet Bulb Temperature DEFINITION 5 When the bulb of a thermometer is kept wet, the thermometers reads a lower temp because evaporation of the water on the bulb draws heat out of the thermometer. The difference between the wet and dry bulb temp can be used to determine the relative humidity of the air. TERM 6 Psychrometer DEFINITION 6 An instrument used to measure the wet and dry bulb temps at the same time. TERM 7 Dew Point Temperature DEFINITION 7 The temp reached when the air becomes saturated (RH=100%). dew point, wet bulb, and dry bulb only equal at saturation. Relationship of dew point, wet bulb, and dry bulb T(dp)<T(wb)<T(db) (Are equal to each other at saturation) TERM 8 Psychrometric Chart DEFINITION 8 A graph of the relationship between T(db), T(wb), T(dp), AH, and RH. Chart given in coursepack/class TERM 9 Temperature DEFINITION 9 Temp is measured with a thermometer. conversionsC = (5/9) * (F-32)K = C + 273 R = F + 460 TERM 10 Gases DEFINITION 10 Gas Law = PV = nRT, P=absolute pressure, V=volume, n=number of moles, T=absolute temp, R=45.61 (universal gas constant).