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Material Properties Flashcards

7 cards from real ASHRAE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Material Properties flashcards as text

  1. What is the approximate specific heat of dry air at constant pressure in I-P units?

    Answer: 0.24 Btu/lb·°F

    For dry air, cp ≈ 0.24 Btu/lb·°F, which gives the 1.08 constant in the sensible heat equation (0.075 × 60 × 0.24).

  2. What density does ASHRAE use for standard air at sea level?

    Answer: 0.075 lb/ft³

    Standard air is taken as 0.075 lb/ft³, which is about 1.2 kg/m³.

  3. A 2-inch layer of insulation has k = 0.25 Btu·in/h·ft²·°F. What is its R-value?

    Answer: R-8

    R = thickness / k = 2 / 0.25 = 8 h·ft²·°F/Btu.

  4. Which piping material has the highest coefficient of linear thermal expansion?

    Answer: CPVC

    Plastics like CPVC expand about 3-4 times as much as copper and about 5 times as much as steel, so they need more room for expansion.

  5. Compared with open-cell spray foam, closed-cell spray polyurethane foam has which characteristics?

    Answer: Higher R per inch and lower vapor permeance

    Closed-cell SPF is rated at about R-6 to R-7 per inch and can act as a vapor retarder, while open-cell is about R-3.5 to R-3.8 per inch and lets vapor through.

  6. What is the approximate latent heat of vaporization of water at 212°F and atmospheric pressure?

    Answer: 970 Btu/lb

    At 212°F, water takes about 970 Btu/lb to boil, which is why steam carries so much heat.

  7. About how much energy does it take to melt one pound of ice at 32°F?

    Answer: 144 Btu

    The latent heat of fusion of ice is about 144 Btu/lb, and 2,000 lb × 144 Btu/lb gives the 288,000 Btu/day definition of a ton of refrigeration.