Views: 0 Author: Site Editor Publish Time: 2022-11-18 Origin: Site
Stronger, Smarter,Better:
Strength is essential when it comes to piping for preconditioned air(positive pressure) applications.The same goes for smart engineering.Reinforced Insulated Duct is intelligently engineered inside and out - outperforming any other brand.All three layers of Reinforced Insulated Ductwork...outer, insulation and inner are made from the highest quality materials to provide unrivaled durability no matter how challenging the ramp requirements.Additionally, welded construction and flame retardancy combine with best-in-class UV stability and mold inhibitors for further performance and durability.
Outer Shell
Shell features 20XHDMW three-ply 20 oz/sqyd (678 g/sqm) high-strength PVC fabric with military-spec black wearstrips.For improved abrasion resistance, 9 mm of high density molecular weight PVC has been added to the outer wear surface.Custom laminates are produced by compressing high-strength, multi-denier, unidirectional ripstop polyester yarns between PVC films.Finished material thickness is 0.029" (0.737 mm).
Insulation Layer 
The middle layer is composed of stitched polyester insulation similar to the high-performance materials found in cold-weather clothing and camping products.
Inner Liner
Inner cover made of Venta 11-1812 high-strength material, 11 oz/sq yd (373 g/sqm), 3-ply PVC fabric VentaTex® 11-1812 is specifically designed to eliminate delamination common in other liners.It is made by compressing high-strength, high-density polyester yarns between PVC films. Finished material thickness is 0.017" (0.432).
PN's: 2012671, 2019289, 2019290, 2019291, 2019292, 2019293, 2019295, 2019296, 2019298, 2019299, 2019300, 2019301, 2019304, 2019306,. 2019312,2019313,2019314，2019315,2019316,2019317,2019318,2019319,2019319,2019320,2019321,2019322，2019323,2019323,2019324,2019323,2019323,201932313323232321327,201327,201327 2019337, 2019338, 2019339, 2019340, 2019341,2019342, 2019343, 2019344, 2019345, 2019346, 2019347, 2019348, 2019349.Pre-conditioned air conditioning units, or PCA units for short, are giant air conditioners that provide a comfortable environment inside an aircraft when the aircraft's own air conditioning system is not on.When an aircraft is parked on the aircraft ramp (or slope), a preconditioned air (PCA) unit provides fresh, conditioned air at a comfortable temperature and humidity to the aircraft cabin.A preconditioning air conditioner (PCA) unit is not much different from the air conditioner in your home.It just has more capacity to handle the air conditioning needs of commercial airliners.
However, unlike home air conditioners, which circulate a large amount of air, PCA units typically do not circulate any air.If it is summer, they supply fresh air to the aircraft only after cooling down, and if it is winter, they supply fresh air to the aircraft after warming up.Look at the Air Conditioning Load of the Airplane
In order to understand the effectiveness of a pre-conditioned air conditioning (PCA) unit,we need to understand the air conditioning requirements of an airliner.
Narrow-body aircraft like the Airbus A320 can carry more than 100 passengers.A wide-body aircraft like the Boeing 777 can carry more than 300 passengers. A jumbo jet (Boeing 747) or Airbus A380 can carry over 500 passengers.Also, the seating arrangement on the plane is not very spacious. If the economy class seats on an airliner were replicated at home, an average-sized bedroom could easily accommodate 20-30 people.Lock so many people in a room with no air conditioning and leave the rest to your imagination.In addition to the above, there are a lot of electrical equipment in operation on the plane, especially in the galley where meals are stored and prepared onboard. Additionally, sufficient temperatures need to be maintained in the cockpit to ensure the smooth operation of electronics.All of the above factors make it necessary to have air conditioning inside the aircraft at all times, whether the aircraft engines are running or not.
When is pre-conditioning required?
An aircraft's air conditioning system depends on its jet engines or auxiliary power unit (APU).These power sources run the air conditioning system to keep the cabin comfortable as long as the plane is in flight.These power sources are turned off when the aircraft lands and eventually reaches the aircraft ramp (or ramp).However, the need for air conditioning remains as passengers are still in the cabin and they need time to exit the aircraft via the jet bridge.In addition, if the air conditioner is not turned on until the plane takes off, the cabin will become too hot in summer and too cold in winter for the passengers of the departing flight.
1. In addition to the above, airline personnel also perform different cleaning and maintenance tasks inside the aircraft to make the aircraft ready for the next flight.
2. All of the above reasons make it imperative that the air conditioning system remains operational as long as the aircraft remains on the tarmac. So when the plane approaches the tarmac, the pilot has three options to keep the air conditioning running after the jet engines shut down,
3. Keep the Auxiliary Power Unit (APU) switched on.
4. Ask the ground crew to connect the air conditioner.
5. Ask the ground crew to connect to the Air Start Unit (ASU).
The use of auxiliary power units (APUs) is discouraged due to noise and emissions - both factors considered negative in the heavily regulated aviation industry.Air starting units (ASUs) are primarily used for engine starting and are therefore also not suitable for air conditioning.That's where Preconditioning Air Conditioning (PCA) units come in. The concept is to connect external air conditioning into the aircraft's air distribution network so that when the aircraft's own air conditioning system is turned off, there is a comfortable environment in the cabin. Keep.
What's up with the name "preconditioned air"?
An interesting question to discuss here is why is it called a "pre-air conditioning unit"? Why not simple air conditioning? After all, it's nothing more than a high-capacity air conditioner that feeds air directly into the aircraft's air-conditioning system.
We have to type in HVAC terms to understand the reasoning behind the name "preconditioned air"”.In HVAC (Heating Ventilation & Air Conditioning) engineering, the space that needs to be cooled or heated is called "air-conditioned space" to distinguish it from the outside atmosphere.An air conditioner is a machine that takes in air from the outside, filters it from any impurities, and changes its temperature and humidity to achieve and maintain the desired atmosphere within the conditioned space.When the outdoor air passes through the air conditioner, its properties are changed, that is, impurities are removed, and the temperature and humidity are lowered. The air that is now ready to enter the conditioned space is called "conditioned air".Taking an aircraft as an example, the interior of the aircraft is an air-conditioned space, and the internal air-conditioning system provides conditioned air that flows in the air distribution network of the aircraft.Pre-conditioned air is so named because from the aircraft's point of view, the air provided by the pre-conditioned air (PCA) unit does not require treatment by the aircraft's internal air conditioning system, i.e. the received air is already conditioned. Hence the name "preconditioned" air.Pre-conditioned air has passed through various stages of air conditioning and is ready to be distributed within the aircraft to maintain a comfortable environment in the cabin.
