- Project plans
- Project activities
- Legislation and standards
- Industry context
Last edited 16 Sep 2016
To help develop this article, click ‘Edit this article’ above.
Typically, heat exchangers are used to allow heat from liquids or gases to pass to other liquids or gases, without the two coming into direct contact. Essentially they transfer the heat without transferring the fluid that carries the heat.
Heat exchange devices can be used in a number of processes, including:
- Air conditioning systems.
- Heat pumps.
- Heat recovery ventilation.
- Waste water treatment.
- Nuclear and power plants.
- Machinery and engines.
- Specialist energy-saving devices such as energy-efficient showers.
The two most common types of heat exchangers are the 'shell and tube' and 'plate' or 'fin':
- In shell and tube heat exchangers, one fluid flows through a series of metal tubes within a sealed unit while another fluid passes between the tubes. The two fluids can flow in the same direction which is called parallel flow, in opposite directions, known as counter flow or counter current, or they can flow at right angles, known as cross flow.
- Plate or fin heat exchangers consist of metal fins with large surface areas that air passes around. This more open construction can allow easier inspection, cleaning and disassembly. This system is often used for chilled beams or integrated service modules.
Variations on these basic types include; plate heat exchangers, double pipe heat exchangers, pillow heat exchangers and so on.
Earth-to-air heat exchangers draw ventilation supply air through buried ducts or tubes. As the temperature of the ground below 3m is practically constant, it substantially reduces ambient air temperature fluctuations and can provide space conditioning throughout the year, with the incoming air being heated in the winter and cooled in the summer.
The appropriate heat exchanger can be selected by consideration of:
- Space availability.
- The heat carrying mediums.
- Fluid flow capacity.
- Pressure limits.
- Temperature ranges.
- Thermal performance requirements.
- Requirements for maintenance and repair.
 Related articles on Designing Buildings Wiki
- Absorption heat pump.
- Air conditioning.
- Air source heat pumps.
- Chilled beams.
- Coefficient of Performance CoP.
- Earth-to-air heat exchangers.
- Geothermal pile foundations.
- Ground energy options.
- Ground source heat pumps.
- Heat pump.
- Heat recovery.
- Integrated service module.
- Thermal labyrinths.
- Water source heat pumps.
Featured articles and news
BRE partner with Global GreenTag to develop an Ethical Labour Sourcing Standard for Australia.
The Chartered Quality Institute explain the pathway to success for organisations implementing management systems.
An introductory article looking at where a duty of care can arise in the construction industry.
House of Lords committee encourages the use of off-site manufacturing in new report.
Computational fluid dynamics (CFD) can go some way to show the impact of new buildings on their surroundings.
The shortlist for the 2018 prize for the UK's best new building is revealed.
Amendment to Bill aims to provide councils with greater powers to increase tax premiums on empty homes.
As the latest summer blockbuster 'Skyscraper' is released, we look at some of the best uses of buildings in film.
Read our introductory article on how to layout a building.
New cross-party report calls for combustible cladding ban to be extended to all high-rise residential buildings.