Table of Contents
- 1 What is boot strap refrigeration?
- 2 What is the difference between boot strap air cooling system and simple air refrigeration system?
- 3 What does a Subcooler do?
- 4 What is aircraft refrigeration system?
- 5 What are the types of refrigerant?
- 6 What are the 4 cycles of refrigeration?
- 7 What are the limitations of bootstrap refrigeration system?
- 8 Why bootstrap air conditioning system is not operable on ground?
What is boot strap refrigeration?
BOOT-STRAPAIR COOLING SYSTEM The term Bootstrap as used in Air Cycle Refrigeration indicates a system in which the pressure of the working fluid is raised in two levels by using two compressors, before the working fluid which is air, expands in the turbine section The main components of this system are: • Two heat …
What is the difference between boot strap air cooling system and simple air refrigeration system?
Bootstrap Air Conditioning System is not effectively operable when the aircraft in on ground. it is actually a modification of simple aircraft refrigeration system. It consists of two heat exchanger and a secondary compressor.
What is the difference between boot strap air cooling system and boot strap evaporative?
Note: Since the temperature of air leaving the cooling turbine in boot-strap evaporative system is lower than the simple boot-strap system, therefore mass of air (ma) per tonne of refrigeration will be less in boot- strap evaporative system.
How many compressors are used in boot strap air cooling system?
Explanation: In Boot-strap air cooling system there are two heat exchangers and a cooling turbine driving the secondary compressor instead of the cooling fan.
What does a Subcooler do?
Subcooling is a process that takes place inside of your condenser coil shortly before the refrigerant moves on to the evaporator coil. At that point, the refrigerant has absorbed enough heat to change the liquid to a gas. This low-pressure gas then flows back to the condensing unit and enters the compressor.
What is aircraft refrigeration system?
Air cycle refrigeration systems belong to the general class of gas cycle refrigeration systems, in which a gas is used as the working fluid. The gas does not undergo any phase change during the cycle, consequently, all the internal heat transfer processes are sensible heat transfer processes.
What is a refrigeration Subcooler?
Why refrigerant is subcooled?
Subcooling is normally used so that when the refrigerant reaches the thermostatic expansion valve, all of it is in its liquid form, thus allowing the valve to work properly. If gas reaches the expansion valve a series of unwanted phenomena may occur.
What are the types of refrigerant?
In the following section, different groups of refrigerants are discussed, some examples are given and their fields of application are described.
- CFC = ChloroFluoroCarbons.
- HCFC = HydroChloroFluoroCarbons.
- HFC = HydroFluoroCarbons.
- FC = FluoroCarbons.
- HC = HydroCarbons.
- NH3 = Ammonia.
- CO2 = Carbon Dioxide.
- Summary Table.
What are the 4 cycles of refrigeration?
The 4 Main Refrigeration Cycle Components
- The compressor.
- The condenser.
- The expansion device.
- The evaporator.
What is boot strap refrigeration cycle?
The boot strap refrigeration cycle aims to correct this situation by letting certain amount of air (ram air) to get in the cycle components. The ram air is compressed by multi compressors that increases the pressure of air to an acceptable level.
What is Bootstrap air cooling system in airplanes?
Aircraft use a similar refrigeration system except that they take use of excess air speed and pressures during their flight. One such system is called bootstrap air cooling system. So what is Bootstrap Air Conditioning System? Bootstrap Air Conditioning System utilizes high speed air to reject excess heat energy from the aeroplane cabin.
What are the limitations of bootstrap refrigeration system?
Bootstrap refrigeration system is not compatible with low speed transportation means. The flow rate of the air must be very high to extract the heat energy. If the air flow speed is not high enough then bootstrap cooling is not effective.
Why bootstrap air conditioning system is not operable on ground?
Bootstrap Air Conditioning System is not effectively operable when the aircraft in on ground. It is operable only when the plane is flying at altitudes. The reason is simple as explained previously; bootstrap system requires high speeds of air as it does not have a cooling air fan.