Types Of Hvac Operations

HVAC systems serve to provide several functions as per the demands and needs of the customers. The types of operations that can be carried out by the  HVAC systems have been categorized as follows:

Heat Pumps

Heat pumps are majorly used for thermal control and variations. The heat pumps constitute efficient systems that extract heat from a cool place as in the case of outdoors in winter, heat it, and then transmit it to an indoor setting to warm the place up. This is how the temperature inside the room can be regulated. A heat pump, when used for heating, works on the same principle as that of the refrigeration-type cycle that is used in air conditioners. Unlike the latter, however, heat pumps push the heated air back into the room instead of releasing it outside.

Heat pumps are four times more advanced and efficient in their output as compared to traditional heating systems.

Further, it should be noted that Heat Pumps can also be used for cooling purposes. This can be achieved as simply as by reversing the air flow of the systems.

Rooftop Unit

As the name indicates, Rooftop Units are large HVAC systems that are installed on roof tops of buildings, apartments, offices or skyscrapers in order to moderate the thermal conditions that prevail inside. Also known as Air handlers, rooftop units are the lage visible boxes that can be seen on top of buildings. They consist of the following units:

  • Blower
  • Heating and cooling elements
  • Filter Racks
  • Chambers
  • Dampers

The ventilation system incorporated into these units distribute the air in the building and then returns it to the system so that it can be dispelled.

Water Source Heat Pumps

These are a special category of heat pumps that contribute to sustainable heating and or cooling of the concerned units. Though uncommon because of their requirement of proximity to water bodies. Of late, however, geothermal pumps are rapidly rising in popularity.

Be it geothermal or water-based, these heat pumps serve to provide heating and cooling services by transferring heat into or out of the ground. This way, the more moderate temperatures of the Earth are exploited by the systems to provide higher rates of efficiency.

Drilling down to create a bore near the HVAC system further enhances the efficiency of this process. The cooled water underneath the earth could then be drawn on by the system to provide drinking water and feed an open-loop heat pump. This would take the heat from the water and use it to raise the heat in a home’s water system, providing heating and hot water. Excess grey water can then be used for irrigation for the garden. This would not only serve to provide sustainable HVAC systems to buildings, but also contribute to the development of a greener and better ecosystem.

Packaged HVAC

Modeled on Rooftop Units, Packaged air conditioners are actually used for domestic purposes. They are of two types:

 Packaged Air Conditioners with Water Cooled Condensers: Generally installed inside buildings, these air conditioners use water to cool condensers. In order to ensure that the air conditioners keep working, water must be continually provided to the system.

 Packaged Air Conditioners with Air Cooled Condensers: These systems use atmospheric air for cooling of condensers, and are therefore outdoor units. These devices have a fan that sucks in air before blowing it onto the condenser coil, much like in the larger rooftop units. Since they don’t need constant maintenance to ensure a smooth flow of water, these are the more popular of the two types of packaged air conditioners.

Split System HVAC

An air conditioning unit where the key components are separated and installed away from each other is called a “split” system air conditioning. They can be categorized as follows:

  •     A Mini-split or ductless system
  •     A Central System

Central systems are ducted efficient air conditioning systems that are more adept at handling situations requiring multi-zone temperature control capability. Using a heat exchanger which is placed inside the central furnace or the air conditioning Unit, chilled air is distributed in the indoor environment.

Ductless System

This is the smallest of air conditioning units that are used exclusively for household or small-scale purposes. They can easily blend into space they are deployed in as they require extremely little wall space, and can look pleasing and aesthetic as well. However, operating on a ductless system may tend to make this Air Conditioning Repair Midlothian system a little more expensive than usual.


Types Of Hvac Systems

There exist several types of HVAC systems that can be used by the consumers in accordance with their needs and comfort. This should be planned and carried out in such a way that it does not unnecessarily lead to the use of excess power or cause an increase in the cost of living. In other words, HVAC systems should be used in a power efficient and cost effective manner. Listed below are the kinds of HVAC systems that exist, and the kinds of climatic or situational conditions that they are best suited to:

Single Stage System:

HVAC systems providing only heating or cooling services, which tend to be inexpensive under ordinary circumstances, are referred to as Single Stage Systems. These are ideal for people living in extreme climatic conditions of heat or cold. However, it must be kept in mind that these HVAC systems do not tend to be very efficient, and are therefore ideal for small-scale or household purposes only.

Multi-Stage System

The majority of today’s heating and cooling systems have several stages to warm or cool air.  Instead of relying on a single stage to generate extremely hot or cold air, multistage systems operate at different levels to create a comfortable environment. This is why they are referred to as multistage systems. Instead of applying the same amount of hot or cold air to the area, multistage systems deliver the air according to the unique conditions that are present during each season of the year. This way, the system provides an adequate amount of warm or cool air to make one more comfortable, save money on energy bills and also help the environment. Multi-stage systems are thus far more cost effective and power efficient than their single state counterparts and are now preferred more in all sectors.

Zoned System:

Zoned systems are yet another means of saving on power and electricity bills. Usually ideal for owners of large properties, parts of which do not have equal requirements of heating or cooling. In case of a Zoned system, valves and dampers are introduced inside the ducts in order to selectively block the flow of air. Consequently, air is vented out at only those areas where it is most needed. Thus, Zoned systems can be employed in Hospitals or Shopping Malls which require varying degrees of thermal comfort, depending on the needs and circumstances. For instance, food courts would require much less cooling than enclosed Restaurant areas and the Restrooms would require much less cooling than any. Thus, Zoned systems have been designed to cater to the needs of individual units or spaces inside the buildings they are used in.

Humidifiers/ Dehumidifiers

HVAC systems may be devised and designed to provide for the function of Humidity control. Both humidifiers and dehumidifiers may be added to the heating or cooling system in accordance with the needs of the people. In case of extremely dry conditions or in the tropics, this is considered to be one of the most essential units of the HVAC.