Understanding the Ins and Outs of the Mobile Air-conditioning System

Understanding the Ins and Outs of the Mobile Air-conditioning System

It’s a pretty powerful feeling isn’t it – adjusting the flow and temperature of the clean, filtered air being delivered to your cab. With the season underway it’s a service you rely on to stay comfortable and even safe. It’s worthwhile developing a basic knowledge of how the air-conditioning system operates because it will also help you to understand system maintenance and service procedures.

 

First let’s consider heat movement, this occurs in three main ways:

  • Conduction – This is the method by which heat is transferred through solid material. Particles heat up at varying rates depending on a material’s thermal conductivity.
  • Convection - Convection is the heat transfer means by which the molecules or atoms of a liquid or gas move in a circular motion and carry heat. If for example air that is hotter than the air in a vehicle’s cab is blown into the compartment it will move upwards, forcing down cooler, dense air. This circulation of air, which will eventually distribute the warmer heated air evenly around the vehicle, is known as convection.
  • Radiant – Radiant heat is created by the rays of the sun hitting a solid object and causing it to heat up.

Stop to consider these types of heat movement and you start to appreciate the challenge your HVAC system faces in delivering a constant regulated temperature. For example, the large glass windscreen in your cab which is so necessary for visibility is usually poorly insulated. It doesn’t stop there, the vehicle itself is subjected to factors such as radiant heat from the sun’s rays and cold weather, which both impact on a cab’s temperature.

 

If you visualize a person using a sponge to first soak up, then wring out a spillage, this process is not altogether dissimilar to what’s going on beneath your bonnet. As demonstrated in the expansion valve system pictured, the mobile AC system extracts heat from a vehicle’s passenger compartment and releases it into the atmosphere by using refrigerant which changes state as it repeatedly cycles through a closed (sealed) system.

 

 

We are Europe’s leading supplier of air-conditioning parts for agricultural and construction vehicles. Search over 30,000 products by vehicle or part/OEM number and read more blogs on our website www.apairltd.com

 

 

Service & support

Industry leading knowledge backed up with the best service available.

Daily shipping

All VOR goods are shipped in the UK on a next day AM service and with our carriers predict service you know when you will receive the parts.

New arrivals

AP Air have a large range of compressors, condensers and evaporators, which are expanding daily.

Agriculture

With over 30 years’ experience in the agricultural market you are in good hands at AP Air.

Heavy Off Road

Being distributors of Bergstrom, RedDot & MCC, the major players in this market we are your one stop shop.

Trucks

With more trucks on the road AP Air are bringing our industry leading service to this market.

 

AP Air Ltd.

Unit 9 & 10 Wisloe Business Park
Wisloe Road
Cambridge, Glos, GL2 7AF
United Kingdom

P: +44 1453 891 320
F: +44 1453 549 647
E: sales@apairltd.com


Register your interest