MEP & E - Chapter 1 - Thermal, Environmental and Comfort Concepts Flashcards Preview

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Flashcards in MEP & E - Chapter 1 - Thermal, Environmental and Comfort Concepts Deck (10)
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1

Heat (Definition)

The agitation or motion of atoms and molecules. Thermal energy in motion.

2

Properties of heat flow

Heat always flows from a substance at a higher temperature to a substance of lower temperature, raising the temperature of the lower temperature substance and lowering the temperature of the higher temperature substance.

3

Quantity of Heat (Symbol and How Measured)

Q
BTU or joules

4

BTU (Defintion)

British thermal unit.
The amount of heat required to raise a pound of water from 59.5 degrees F to 60.5 degrees F at a constant pressure of standard atmospheric pressure.
One Btu is roughly equivalent to one lit wooden match

5

Btu = ? joules

1055 joules (J)

6

Btu = ? watt-hours

0.293 watt-hours (W-hr)

7

Btu = ? calories

252 calories (c)

8

MBtu

one thousand Btu

9

MMBtu

one million Btu

10

Heating Value (Definition)

Calorific value
The quantity of heat produced by its combustion under specific conditions.
It is the energy released as heat when it undergoes complete combustion with oxygen