Refrigeration Safety 080305a Flashcards
A liquid cannot become a gas unless?
It absorbs heat which does not raise its temperature
A gas cannot become a liquid unless?
It gives off heat which does not lower it’s temperature
How do refrigerants work?
They absorb heat by evaporating at a low temperature and pressure and release heat by condensing at a higher temperature and pressure
What temperature does water boil at at 5000 feet?
203°F (95°C)
How does heat travel?
From a warm object to a colder one (warm to cold)
What is sensible heat?
The heat required to produce a change in temperature but not a change in state
What is specific heat?
The number of BTU’s required to raise the temperature of 1 pound of a sunstance by 1°F
What is the specific heat capacity of ice and steam?
0.5 Btu/lb/°F
What is the specific heat capacity of water?
1 BTU/lb/°F
What is latent heat?
The amount of heat required to change the state of a substance without changing its temperature
How many BTU are required to change 1 pound of ice to a liquid?
144 BTU
How many BTU are required to change liquid water into steam?
970 BTU
How many BTU are in 1 ton of refrigeration?
12000 BTU/hr
What colours coordinate with the high side and low side of a manifold pressure gauge set?
Red for high side
Blue for low side
When exposed to an open flame, refrigerants that contain fluorocarbons break down to produce what?
Dangerous poisonous vapours?
