Desuperheater units are located
between the compressor and condenser
to utilize the high-temperature energy of the superheated refrigerant gas.
What is Desuperheating in refrigeration?
What is a Desuperheater? A desuperheater is
a device that cools down the superheated refrigerant
(gas that is at a temperature above its saturation temperature). The temperature of this gas is reduced by spraying droplets of water into the flow of the superheated gas.
Where does subcooling take place?
Subcooling is a process that takes place
inside of your condenser coil
shortly before the refrigerant moves on to the evaporator coil.
In which two areas of the refrigeration cycle is refrigerant superheated?
In the compression refrigeration cycle, the refrigerant is superheated:
Leaving the evaporator, through the compressor, up to the condenser
. On an R-410A air conditioning system, the refrigerant leaving the ________ is 118 psig, 50°F, 100 percent superheated gas.
What is Desuperheating a vapor?
Desuperheating is
the process by which superheated steam is restored to its saturated state
, or the superheat temperature is reduced. Most desuperheaters used to restore the saturated state produce discharge temperatures approaching saturation (typically to within 3°C of the saturation temperature as a minimum).
What is an Attemporator?
:
a coil of pipe through which hot or cold water may be run for regulating temperature
.
Is temperature constant in a condenser?
Temperature profile inside the condenser
The temperature of the refrigerant decreases during the desuperheating and sub-cooling processes, but
remains constant during the condensing process
(see Figure 7.3). The energy rejected from the refrigerant heats the secondary medium, whose temperature thus increases.
What happens if subcooling is too high?
If the subcooling is too high,
the system will be overcharged, reducing performance, efficiency
, and ultimately damaging compressor valves and start components.
How do I calculate subcooling?
If we measure the temperature on the liquid line exiting the condenser coil then we know the end temperature after the refrigerant has lowered in temperature.
Subtract the lower temperature measured on the liquid line from the saturated temperature
and you have subcooling!
What should my subcooling be?
Subcooling on systems that use a thermostatic expansion valve (TXV) should be
approximately 10F to 18F
. Higher subcooling indicates excess refrigerant backing up in the condenser. … To check subcooling, attach a thermometer to the liquid line near the condenser.
What does superheat mean in HVAC?
Superheat occurs
when that vapor is heated above its boiling point
. Let’s say that refrigerant boils at 40 degrees at a low pressure in the evaporator. … Superheat is critical in HVAC because it ensures the liquid refrigerant is boiled off before it leaves the evaporator and heads to the compressor.
Why is the refrigeration cycle called a cycle?
It
has the maximum efficiency for a given temperature limit
. Since it is a reversible cycle, all four processes can be reversed. This will reverse the direction of heat and work interactions, therefore producing a refrigeration cycle.
What is suction superheat in chiller?
Any additional temperature increase above the boiling point
is called superheat. Finding suction line superheat requires finding the suction pressure and two temperatures — the evaporator boiling temperature at a given pressure, and the temperature of the refrigerant at the outlet of the evaporator on the suction line.
What does Desuperheat mean?
transitive verb. :
to lower the temperature of
(superheated steam or other vapor) intransitive verb. : to desuperheat steam.
What is the difference between desuperheater and Attemperator?
is that desuperheater is a device that
reduces the temperature of superheated steam
, and recovers useful heat in the process while attemperator is a device that regulates the temperature (especially in a boiler) by passing hot or cold water through a coil of piping.
What is the purpose of desuperheater?
The primary function of a desuperheater is
to lower the temperature of superheated steam or other vapors
. This temperature reduction is accomplished as a result of the process vapor being brought into direct contact with another liquid such as water. The injected water is then evaporated.
