What is the use of reheat cycle in steam turbine?
The purpose of a reheating cycle is to remove the moisture carried by the steam at the final stages of the expansion process. In this variation, two turbines work in series.
Why Carnot cycle is practically not possible?
This means that the Carnot cycle is an idealization, since no real engine processes are reversible and all real physical processes involve some increase in entropy. It is not a practical engine cycle because the heat transfer into the engine in the isothermal process is too slow to be of practical value.
Can Rankine be negative?
Like the Kelvin scale, the Rankine scale has no negative temperatures. This is an obsolete temperature scale where the freezing point of water is zero degrees Réaumur and the boiling point of water is 80 degrees Réaumur.
What is a hot gas bypass used for?
The hot gas bypass is a valve that automatically regulates the cooling temperature in the dryer exchanger based on the refrigerant pressure. The pressure measured after the heat exchanger directly correlates to the temperature in the system. A low pressure means there will be a low temperature.
How does a hot gas defrost system work?
The hot gas defrost process uses the superheated vapor from the compressor discharge (on high pressure and high temperature) as the heat source. This vapor is diverted on a third system line, bypassing the condenser and the expansion valve, and directed through the unit cooler coil, warming it from the inside.
What is a Rawal valve?
The Rawal APR is a capacity control device that can be added to a R-22 or R-410a Dx refrigeration system. The Rawal APR allows the Dx system to operate at lower than full load with no changes to the evaporator’s apparatus dew point conditions.
What does APR valve stand for?
hot gas bypass valve
What is hot gas defrost?
In hot gas defrost, refrigerant vapor from either the compressor discharge or the high pressure receiver1 is used to warm the evaporator coil and melt the frost that has collected there. The vapor condenses to a liquid during this process, and is then routed back to a protected suction line or to an accumu- lator.