Refeers

In order for refrigerant to change to a liquid in the Condenser, the refrigerant must:

(To change phase temperature AND pressure remain the same. It's the internal energy (Enthalpy) that changes.)

If R-134a is stored in a space with the internal pressure of the cylinder equal to atmospheric pressure, the temperature of the refrigerant would have to be: (hint: use the Saturation chart in the lab handout (if you don't have one yet look at the Bb lab section).

-14.8 dF

"Which classification under Refrigerant Toxicity/Flammability Group would represent the worst refrigerant (ex.: A1, A2, B1 .)

B3

From what component does the Compressor take suction from in the vapor compression refrigeration cycle?

Evaporator(?)

The term used to describe heat that cannot be measured with a thermometer is _____________________ heat.

Latent heat

A Green colored refrigerant bottle would indicate which refrigerant?

R-22

n the illustration below, select the component that controls the system's high side pressure.

The condenser controls the high side pressure. To be more concise, it's the saturated temperature of the refrigerant in the condenser that determines high side pressure in a properly operating system.

A characteristic of refrigerants are that they all have the different boiling points and latent heat values.

True

"Inside the flask with a refrigerant, the pressure may vary and effect the phase of the refrigerant"

True/False

As the liquid refrigerant boils inside the "flask," it loses thermal energy from the air surrounding the "flask" causing the energy of the refrigerant to increase.

True/False

If you were to apply a vacuum to a sealed container with refrigerant inside, without any other external influences, the temperature of that refrigerant will drop.

True/False

Inside the flask with a refrigerant, the flask when sealed will always be under a constant pressure regardless of any external conditions because it is a very solid, sealed flask.

True/False

The amount of heat necessary to superheat R-134a by 10 dF is equal to the amount of heat necessary to subcool R-134a by 10 dF.

True/False

The function of the Condenser is to convert vapor refrigerant to a liquid refrigerant by discarding heat.

True/False

Vapor refrigerant under the same pressure and temperature as liquid refrigerant always has more energy because of the latent heat of fusion.

True/False

If R-134a is stored in a cylinder which is at 70 dF, the bottle has a pressure equal to:

a pressure corresponding to 70 dF

How many Btu/Hr would a 227 ton refrigeration appliance be able to transfer per hour? Give only whole numeric answer (no decimals).

2724000

How many Btu/Hr would a 27 ton refrigeration appliance be able to transfer? Give only whole numeric answer.

324000