WorksheetsJ106A 2
Total questions: 10
Worksheet time: 20mins
RMD stands for
remote metering device
refrigerant meeting device
refrigerant metering device
remote meeting device
An example of a fixed orifice metering device is
TEV
TXV
AEV
Capillary
The function of a refrigerant metering device is to:
provide sufficient liquid refrigerant to maximise efficiency
provide pressure regulation to enforce latent heat
achieve pressure drop across the evaporator
remove any incondensables from circulation around the system
The flow rate of a refrigerant is controlled by the
compressor
RMD
liquid receiver
condesation
Superheated refrigerant is
below saturation
liquid
above saturation
hot
Draw in the superheated pipes only
Regulating the flow of refrigerant is to
let the compressor work
keep it safe
keep efficiency
let the condenser absorb heat
Why do we keep a stable pressure in the evaporator
To allow the latent heat change in the refrigerant at a certain temperature
to restrict the latent heat change
to remove temperature from the refrigerant at said pressure
to enforce the specific heat capacity on the refrigerant
When checking evaporator superheat we measure the temperature
at the outlet of the RMD
at the outlet of the compressor
at the outlet of the condenser
at the outlet of the evaporator
When adjusting a tx valve screw, if you turn the screw clockwise are you increasing or decreasing the pressure against the bulb pressure
increasing
decreasing
neither, same side of diaphram
which way is clockwise?
