Whether you require Tips and Advice about radiators, plate heat exchangers or heating systems in general AEL have the technical expertise to provide guidance on your system design and which products are best suited to your application.
Should you not find the answer to your problem in our “Tips and Advice” articles and require any help feel free to contact our technical sales office.
Delivery Terms & Conditions
- AEL will contact you during the next working day to discuss a convenient delivery date of your order.
- Orders delivered by road transport are delivered to the nearest convenient hard standing position and the consignee is responsible for offloading.
- Standard delivery is between 9am and 5pm on weekdays only, prices for timed deliveries and weekend deliveries can be provided by our sales office upon request.
- Please note that missed deliveries can be rescheduled and are chargeable.
- We're open 9am to 5pm weekdays with Saturday collections possible by prior arrangement.
- Please note that Cast Iron Radiators are heavy so we advise that you double check the weight of your order and the maximum weight your vehicle can carry as AEL can accept no responsibility for the suitability of your vehicle.
WHAT IS THE DELTA P IN A HEATING SYSTEM
The Delta P is the pressure drop in a heating system which can be defined as the difference in total pressure between two points (e.g A and B) of a fluid carried through the pipework or heating equipment such as a radiator as shown below.
Pressure drop occurs when frictional forces, caused by the resistance to the water flows through the pipe or radiator etc.
The main causes of resistance to the flow of water is the fluid velocity through the pipe or vessel and the fluid viscosity.
Pressure drop increases proportional to the frictional resistance within the heating pipework and heating equipment installed.
A heating system with a large amount of pipe fittings, tube convergence, divergence, turns, surface roughness and other physical properties will affect the overall system pressure drop.
High flow velocities and / or high fluid viscosities result in a larger pressure drop across a section of pipe, pipe fittings or heating equipment.
Low velocity will result in lower or even zero pressure drop.
OVERCOMING THE PRESSURE LOSS BY USING A PUMP
The head or pressure can be overcome by a pump but it must be sized to be at least equal to the total resistance to the flow of water in the whole of the heating circuit.