Shared Flashcard Set

Details

low temp quiz
refridgeration practices
21
Education
Not Applicable
04/23/2011

Additional Education Flashcards

 


 

Cards

Term
If the evaporator (TD) is high what will the suction pressure be?
Definition
low
Term
how many Btu's per ton for coolers
Definition
8000 Btu's per ton per hour
Term

Gaskets provide a seal between the door and the cabinet

 

What are the 2 types of gaskets?

Definition

Magnetic

and baloon style

Term
What is the purpose of the case or stile heater?
Definition
To prevent condensationor moisture from forming around the front flange area
Term
If the condenser (TD) is high what will your head pressure be?
Definition
high
Term
Who is ASHRAE
Definition

American society of heating,refridgeration and air conditioning

 

Term
What is the purpose of a mullion heater?
Definition
to prevent condensation from forming along the rail
Term
what is the purpose of the power saver switch?
Definition
to save energy by turning the stile and mullion heaters off durring low humidity conditions
Term

what are the manufacturers classifications for:

high temp

medium temp

low temp

Definition

high temp +45 F

medium temp +20 F

low temp -10 F

extra low temp bloow -10 F

ultra low temp below -40 F

Term
what will happen to the density of a saturated vapor when heat is added?
Definition
it will increase
Term
as density decreases the volume?
Definition
increases
Term
heat removed from a saturated vapor causes the density to
Definition
decrease
Term
air is a mixture of what 2 gases
Definition
dry air and water vapor
Term
is water vapor lighter or heavier than dry air?
Definition
lighter
Term

which is more dense

dry air alone or

a mixture of dry air and water vapor?

Definition
dry air alone
Term
what are the air properties that a psychometric chart will determine?
Definition

dry bulb temp

wet bulb temp

and relative humidity

Term
what is relative humidity
Definition
The percentage of moisture in the air at a given temperature
Term
if the evap (TD) goes up what will happen to the Relative humidity
Definition
it will go down
Term

relative humidity and evap (TD) are inversely proportional

 

true/false

Definition
true
Term
why is relative humidity important in medium temp applications?
Definition

to maximize product life

 

to prevent product dehydration

Term
how many Btu's per ton for freezers
Definition
4000 Btu's per ton per hour
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