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N°2 – Controlling ambient temperature training (VTC level)

General presentation of air conditioning N°2 – Controlling ambient temperature training (VTC level)

We saw in the section,”Presentation of hot water heating” that to maintain an ambient temperature during the winter, it was necessary to “pour” as much heat into a room as it lost because of the losses.


 
In winter, to provide the necessary heat we could:

  • Install a heat emitter fed by hot water or electricity
  • Introduce an air flow which is hotter than the ambient temperature.

 
 
It would be the same for the summer, but instead of losing energy the room receives energy from the exterior, (sun, temperature) and from the interior (electric appliances, lighting, occupants).

These inputs are called conditioning loads, external and internal loads.
 
To maintain the interior temperature of a room in summer, as much energy needs to be removed as it receives.
 

Question  

We know that in winter, to provide the necessary heat we could:

  • Install a heat emitter fed by hot water or electricity
  • Introduce an air flow which is hotter than the ambient temperature.

In common with the 2 technical solutions referred to above to provide heat to premises in winter, define 2 principles allowing the extraction of heat (or energy) from the premises in summer.

To extract the heat in summer we could:

  • Install a “cooler” supplied by “chilled” water, or a refrigerating liquid (see section “Presentation of refrigerating machines”)
  • Introduce an air flow into the room which is colder than the ambient temperature.
  • To air condition a room, we can place an element colder than the ambient temperature (thermal “receiver”), supplied by chilled water (fan coil unit) or a refrigerant (conditioner).

We can see section « Air conditioners – Part 1» and section « Fan coil units ».

  • To air condition a room, we can extract the air and blow in fresh air, prepared in an air handling unit (“all-air” conditioning).

We can see section « Air handling unit – Part 1)».

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