Language:   Useful Links: FAQs Sitemap  
Heating, Ventilating, and Air-Conditioning
Home  /  Articles  


Heating, Ventilating, and Air-Conditioning (HVAC)

November 23, 2011


HVAC (Heating, Ventilation, and Air-Conditioning) refers to technology of indoor or automotive environmental comfort. The main purposes of a Heating, Ventilation, and Air-Conditioning (HVAC) system are to help maintain good indoor air quality through adequate ventilation with filtration and provide thermal comfort. HVAC systems are among the largest energy consumers in Buildings.

Mechanical systems are a necessary evil in most buildings. It is good to rely entirely on natural ventilation and passive solar heating and cooling, but that’s not usually feasible. But we can design buildings so that the architecture does most of the work, and use mechanical systems to take care of the reduced heating, cooling, and ventilation loads that remain. Done right, this approach allows us to invest in highly efficient equipment which come with a very low pay-back period.

Reducing HVAC loads

Some types of mechanical equipment don’t provide heating or cooling directly, but they reduce the amount of heating or cooling that’s needed. Air-to-air heat recovery systems, for example, exchange heat between outgoing and incoming air streams, so less energy is needed to condition the fresh air coming in. 

Renewable Energy

Solar energy isn’t just for photovoltaics (PVs) that generate electricity; it can also be used to heat water, to heat incoming air, or to heat a space directly. Heating needs can also be met with biomass, in the form of cordwood, pellets, or other cellulosic materials. Cogeneration systems that simultaneously generate heat and electricity, make the most complete use of the energy available from combustion. Cogeneration systems are covered under Electrical.

Energy Recovery Ventilation

Indoor air can be 2 to 5 times more polluted than outdoor air; therefore, most HVAC system designers understand that increased amounts of outdoor air supply is generally better for IAQ. Yet there are concerns over the implications that this added amount of outdoor air supply has on the first cost and operating cost of the HVAC system, as well as moisture control for the Building. 

First cost, energy costs, and moisture control do not have to be at odds with good IAQ. Energy recovery ventilation equipment can make the negative implications of 15 cfm per person of outdoor air behave like 5 cfm, while retaining the IAQ advantage of 15 cfm. This approach has been proven in many Buildings in various countries.

Other Group
& Drying
  Dry Air On Rent   Compressed Air Drying   Compressed Air Drying   IT Portals