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Heating Ventilation and Air Conditioning Full Course - HVAC Course (Part 62)


         In this part of Full HVAC Course, we will learn about Types of Heating Coils.

Types of Heating Coils in HVAC

Stereotactic coil types

Transitional coil types

Ductless heating coil systems

Heat pipes and coils systems

Cooling coil systems

Steel coil systems

Fire-preventing coil systems

Coil and pipe systems


Various residential heating and cooling systems are available to make you comfortable and safe during the harsh winters. With better technology and sophisticated systems, we can do without the complicated HVAC.

Rising need for cleaner and healthier indoor air as well as natural gas heating and cooling system have made building owners to switch over from traditional heating to HVAC system. The demand for more space and convenience is being generated by the rise of the quality of life.

Types of Heating Coils in HVAC

1. Electrical

Electrical heating coil systems have a large amount of flexibility and adaptability that make them popular in larger scale commercial and industrial HVAC systems. They are easily the most costly type of heating coil system. The drawbacks of an electrical system are that it is only applicable for commercial HVAC systems and is less space-efficient, as it requires more space around each system.

Electric heating coils are installed inside a sealed package or inside a box that is held inside the air stream to increase its overall performance. Electric heating coils can be easily stored because they require much less space than other heating coils.

2. Mechanical

Mechanical heating coils are suitable for residential HVAC systems and only need space for mounting. The drawback is that they are less energy-efficient and require more space. They are also installed without a package. Mechanical systems require specialized controls that allow them to function with a minimum of energy consumption.

Mechanical heating coils also require a pre-installation permit. These permits must be obtained from your local building department and are typically valid for one year. These permits are required for units that will be above 80 degrees Fahrenheit (26 degrees Celsius) or 25 pounds (11 kg).

3. Physical

Physical coil systems use a coil that is physically connected to the unit's heating element. This is the most space-efficient type of heating coil because it does not require any extra packaging and the coil does not have to be mounted. Physical coils are also typically installed for air conditioning systems that require a cold-water return to function.

Physical coils require a mechanical unit to be installed to pull and force the air down. This can be performed by an outside contractor for commercial installations, or by your air conditioning contractor for residential installations.

4. Heating Equipment

Electrical coils are not the only type of heating equipment available. You may also need to use heating equipment like coils or a blower to provide heating for your system. There are also products available that provide heating for non-electric systems, such as a portable heat pump.

Heat pump units are mainly used as furnaces in households, but they are also suitable for larger industrial applications. Residential heating and cooling is principally carried out by heat pumps and forced air furnaces. These units are made of cast iron, steel and copper and are also available in stainless steel.

HVAC systems differ from one country to the other depending on the requirements and climate.

United States

USA is the leading market for residential heating and cooling due to huge population and huge area. More than 80% of the houses in USA are equipped with air conditioning systems. HVAC systems are required in these countries for heating the building and for controlling its temperature. In USA, most of the HVAC systems are designed with the use of pre-manufactured components, such as thermostats and sensors, that need to be customized by professionals. These are the basic components in HVAC systems that can be customized according to each end-user’s needs. Many residential HVAC systems in USA are also equipped with thermostats and sensors, whereas few of them are built with perforated panels and adjustable valves.
Heat exchanger coil This type of coil is made up of a movable heat exchanger housing. The housing is filled with high-quality water or oil. The heat exchanger is attached to the radiators (or furnaces) of the HVAC system. The heat exchanger starts at the top of the coils and passes down through the tubes until it reaches the coils, which can withstand the high temperatures. It is a perfect type of coil to use for in-floor heating systems. Through-duct coil Through-duct coil is a type of thermal coil used in the HVAC system. It helps remove hot air from the indoors and sends it outside the building through the vent system. There are different types of through-duct coils. The most common one is the metal-clad through-duct coil. Metal-clad through-duct coil helps in regulating air temperature and doesn't need any additional shielding for use in residential homes. Zonal system coil Zonal system coil is another type of thermal coil that is used in the HVAC system. It helps get rid of humidity and also provides comfort. This coil is called Zonal System coil because it uses four grids to control the airflow of air through the coils. The system basically prevents cold air from getting into the rooms through the basement. Zonal system coil allows the air to flow naturally from the radiators, which produces optimum energy efficiency. The grids are connected to each other through a vent system, which ensures efficient flow of air. Zonal system coil helps in controlling temperature in the entire building.
Electric coil type of heating coil has been the major generator of the HVAC market. Electric coil type of heating coil is made up of transformer and an electric heating element. In this type of coils, the electric heating element consists of a conductor, control rods, and a reference electrode.

Conversely, gas coil coil is the economical type of heating coil in HVAC market. Gas coil is a dry cold coil used as a medium to heat and pressurize the air used in a commercial building. An air heater is required to pressurize the air. In this type of coil, the air heater is required to be completely enclosed in the coil to keep the air intact inside the coil.
Conclusion Temperatures of the indoor environments play an important role in helping maintain the quality of life of everyone. The HVAC system plays an integral role in controlling the heating and cooling operations of the building. A careful selection of HVAC system components, coupled with the best possible implementation of these components, will help provide an optimal environment for the residents.

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Heat Load Calculation Guide 1

Heat Load Calculation Guide 2

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How to Calculate External Static Pressure (ESP) with worked Example

How to Calculate Area of Sand Trap Louver with worked Example and detailed steps

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