What are the types of duct heaters? Meaning & Specifications

duct heater

In today’s fast-paced industrial world, duct heaters are essential to many HVAC systems (Heating, Ventilation, and Air Conditioning). They play a crucial role in heating and maintaining the temperature of the air flowing through ducts. However, choosing the right type of duct heater for your specific application can take time and effort, given the variety of available options.

Duct heaters come in different types and specifications, each designed to meet specific heating requirements. They can be utilized in different ways, from residential and public buildings to industrial facilities. Understanding the different types and specifications of duct heaters is crucial for selecting the most suitable one for your application.

In this article, we will explore what duct heaters are, their importance, and the different types and specifications available in the market.at the end of this paper, you will have a comprehensive understanding of duct heaters to decide when choosing one for your HVAC system.

 

What is a Duct Heater, and How Does it Work?

What is the duct heater? Duct heaters are essential to modern heating, ventilation, and air conditioning (HVAC) systems. They are crucial in providing precise and controlled heating to homes and buildings. This section will define duct heaters and explain their role in HVAC systems.

We will also talk about how they work with forced air systems to provide efficient heating and the benefits of duct heaters.

There are several benefits of using duct heaters in HVAC systems.

Firstly, they improve indoor air quality by providing clean, warm air free from dust and other contaminants. This is particularly essential for people with allergies or respiratory issues.

Secondly, duct heaters are energy efficient, as they only heat the needed air, reducing energy consumption and costs.

Finally, duct heaters provide precise and controlled heating, ensuring the temperature is comfortable, regardless of the external temperature.

 

What are the Types of Duct Heaters?

Duct heaters are an essential component of HVAC systems for businesses across industries. They are responsible for maintaining a comfortable indoor temperature and preventing the formation of condensation in the ductwork. However, not all duct heaters are created equal. In this area, we will explore the different types of duct heaters available in the market and help businesses choose the one that best suits their needs.

 

Electric Duct Heaters

Electric duct heaters are the most common type of duct heater used in commercial and industrial settings. They are energy-efficient and easy to install, making them a popular business choice. Electric duct heaters come in two types: open coil and tubular. Available coil heaters are ideal for low-temperature applications, while tubular heaters are better suited for high-temperature applications.

Electric Duct Heaters

Application:

Electric Duct Heaters are used in various applications where heating is required within HVAC systems. Some common applications include:

  1. Residential Heating: Electric Duct Heaters can be used in residential HVAC systems to provide warmth to different areas of a house or apartment.
  2. Commercial Buildings: They are installed in commercial buildings, such as offices, retail stores, and hotels, to maintain comfortable temperatures and create a pleasant indoor environment.
  3. Industrial Facilities: Electric Duct Heaters find application in industrial settings, including factories and warehouses, where precise temperature control is necessary for processes or to prevent equipment from freezing.

Specifications:

The specifications of Electric Duct Heaters can vary depending on the specific model and manufacturer. However, here are some common specifications to consider:

  1. Heating Capacity: Electric Duct Heaters are available in a range of heating capacities, typically measured in kilowatts (kW) or British Thermal Units (BTU). The heating capacity should be chosen based on the required heat output for the specific application.
  2. Size and Dimensions: Electric Duct Heaters come in various sizes to accommodate different ductwork configurations. They are designed to fit into standard duct sizes, and the dimensions should be suitable for the available space.
  3. Control Options: Electric Duct Heaters can be equipped with different control options, including built-in thermostats, temperature sensors, and compatibility with external control systems. These controls allow for precise temperature regulation and integration with the overall HVAC system.
  4. Safety Features: Look for safety features such as thermal overload protection and limit switches that prevent overheating and ensure safe operation.
  5. Materials and Construction: Electric Duct Heaters are typically constructed with corrosion-resistant materials, such as stainless steel or galvanized steel, to withstand the air environment within the ductwork.
  6. Electrical Requirements: Consider the electrical requirements, such as voltage and phase, to ensure compatibility with the available power supply.

Features of Electric Duct Heaters:

  1. Efficient heating capability.
  2. Customizable heating capacity to match specific requirements.
  3. Temperature control through integrated sensors and thermostats.
  4. Versatility for use in residential, commercial, and industrial settings.
  5. Zoning capabilities for independent heating of different areas or zones.
  6. Safety features including thermal cutouts, high-limit controls, and overcurrent protection.
  7. Low maintenance due to the absence of moving parts.
  8. Compact design that fits within the ductwork.
  9. Energy efficiency by converting electrical energy into heat with minimal wastage.
  10. Integration with building automation systems for centralized control and monitoring.

Advantages of Electric Duct Heaters:

  1. Rapid and efficient heating for immediate warmth.
  2. Precise customization to meet specific heating requirements.
  3. Consistent and controlled temperature within the duct system for optimal comfort.
  4. Versatile application across various residential, commercial, and industrial settings.
  5. Enhanced control over temperature distribution and energy consumption with zoning capabilities.
  6. Safe operation with built-in safety features.
  7. Minimal maintenance requirements, reducing downtime and costs.
  8. Space-saving design that does not require additional floor or wall space.
  9. Energy-efficient operation by converting most of the electrical energy into heat.
  10. Seamless integration with building automation systems for enhanced efficiency and convenience.

These features and advantages collectively make electric duct heaters an effective and desirable heating solution for ducted HVAC systems.

 

Gas-Fired Duct Heaters

Gas-fired duct heaters are another popular choice for businesses. They are typically used in large industrial applications where electricity is unavailable or too expensive. Gas-fired duct heaters are more energy-efficient than electric heaters and can produce higher temperatures. However, they require a gas supply and may only suit some buildings.

Gas-Fired Duct Heaters

Application:

Gas-Fired Duct Heaters find application in a variety of heating systems where natural gas or propane is available. Some common applications include:

  1. Commercial and Industrial Heating: Gas-Fired Duct Heaters are frequently employed for commercial and industrial heating purposes in environments like warehouses, manufacturing plants, and sizable office complexes. They offer an economical and effective heating solution for expansive areas.
  2. Heating in Cold Climates: In regions with extremely cold climates, Gas-Fired Duct Heaters are often employed to supplement the primary heating system. They help maintain comfortable temperatures and prevent freezing in areas such as loading docks, garages, and entryways.
  3. Ventilation Systems: Gas-Fired Duct Heaters can be integrated into ventilation systems to provide heating capabilities. This is useful in applications where fresh outside air needs to be preheated before being distributed into a building or space.

Specifications:

The specifications of Gas-Fired Duct Heaters can vary depending on the specific model and manufacturer. Here are some common specifications to consider:

  1. Heating Capacity: Gas-Fired Duct Heaters are available in different heating capacities, typically measured in BTU (British Thermal Units) per hour. The heating capacity should be chosen based on the required heat output for the specific application.
  2. Burner Type: Gas-Fired Duct Heaters have the flexibility to utilize either natural gas or propane as their fuel source. The choice of burner type should be determined by considering the availability and cost of the fuel in the specific location.
  3. Efficiency: Gas-Fired Duct Heaters often have an efficiency rating, typically represented as a percentage. Higher efficiency units convert a larger portion of the fuel’s energy into heat, resulting in lower operating costs.
  4. Size and Dimensions: Gas-Fired Duct Heaters come in various sizes to accommodate different ductwork configurations. The dimensions should be suitable for the available space.
  5. Control Options: Gas-Fired Duct Heaters can be equipped with different control options, including thermostats, temperature sensors, and compatibility with external control systems. These controls allow for precise temperature regulation and integration with the overall HVAC system.
  6. Safety Features: Look for safety features such as flame monitoring, gas pressure switches, and high-temperature limit switches. These features ensure safe and reliable operation.
  7. Material Construction: Gas-Fired Duct Heaters are commonly designed using materials resistant to corrosion, such as stainless steel or galvanized steel, ensuring their durability against the combustion process and the air conditions within the ductwork.
  8. Venting Requirements: Gas-Fired Duct Heaters require proper venting to exhaust combustion byproducts. The venting system should comply with local codes and regulations.
  9. Gas Supply Requirements: Consider the gas supply requirements, including gas pressure and pipe sizing, to ensure compatibility with the available gas infrastructure.

Features of Gas-Fired Duct Heaters:

  1. Efficient Heating: Gas-fired duct heaters offer high thermal efficiency, converting a significant portion of the gas energy into heat.
  2. Customizable Heating Capacity: Gas-fired duct heaters are available in various sizes and capacities, allowing for precise customization to match heating requirements.
  3. Combustion Control: These heaters are equipped with combustion control systems that regulate the gas flow and optimize the combustion process for efficient and clean heating.
  4. Temperature Control: Gas-fired duct heaters can be integrated with temperature sensors and thermostats to maintain precise control over the desired temperature within the duct system.
  5. Versatility: Gas-fired duct heaters can be used in a wide range of applications, including residential, commercial, and industrial settings, providing heating solutions for various HVAC systems.
  6. Zoning Capabilities: Gas-fired duct heaters allow for zoning capabilities, enabling independent heating of different areas or zones within a building.
  7. Safety Features: These heaters incorporate safety features such as flame monitoring systems, gas pressure switches, and high-temperature limit switches to ensure safe and reliable operation.
  8. Low Maintenance: Gas-fired duct heaters generally require minimal maintenance, with routine inspections and periodic servicing of the combustion system.
  9. Compact Design: Gas-fired duct heaters are designed to fit within the ductwork, saving space and integrating seamlessly into the HVAC system.
  10. Integration with Building Automation Systems: Gas-fired duct heaters can be integrated with building automation systems for centralized control, monitoring, and scheduling, enhancing overall system efficiency and convenience.

Advantages of Gas-Fired Duct Heaters:

  1. Efficient and cost-effective heating solution.
  2. Precise customization to meet specific heating requirements.
  3. Clean combustion process, reducing emissions and environmental impact.
  4. Reliable and consistent temperature control within the duct system.
  5. Versatile application across various residential, commercial, and industrial settings.
  6. Zoning capabilities for targeted heating and energy savings.
  7. Built-in safety features ensure safe operation.
  8. Low maintenance requirements, resulting in reduced downtime and costs.
  9. Space-saving design that integrates into the existing HVAC system.
  10. Integration with building automation systems for centralized control and enhanced efficiency.

These features and advantages make gas-fired duct heaters a reliable and efficient option for heating applications in ducted HVAC systems, providing customizable heating capacities, precise temperature control, versatility, zoning capabilities, safety, and integration with building automation systems.

 

Steam Duct Heaters

Steam duct heaters are used in applications where high-temperature air is required. They are typically used in large industrial settings where steam is readily available. Steam duct heaters are energy-efficient and can produce very high temperatures. However, they require a steam supply and may only be suitable for some buildings.

Steam Duct Heaters
Steam Unit Heaters

Application:

Steam Duct Heaters find application in various heating systems where steam is available as a heat source. Some common applications include:

  1. Industrial Processes: Steam Duct Heaters are used in industrial processes where hot air is required for drying, curing, or other manufacturing processes. Industries such as food processing, textile production, and paper manufacturing often utilize steam duct heaters for their heating needs.
  2. Commercial Buildings: They can be employed in commercial buildings, including offices, hospitals, and educational institutions, for space heating and maintaining comfortable indoor temperatures.
  3. HVAC Systems: Steam Duct Heaters can be integrated into HVAC systems as a heating component. They help provide warm air for ventilation and distribute heat throughout the building.

Specifications:

The specifications of Steam Duct Heaters can vary depending on the specific model and manufacturer. Here are some common specifications to consider:

  1. Heating Capacity: Steam Duct Heaters are available in different heating capacities, typically measured in BTU (British Thermal Units) per hour. The heating capacity should be chosen based on the required heat output for the specific application.
  2. Steam Pressure and Temperature: The steam duct heater’s specifications should include the acceptable steam pressure and temperature ranges. It is important to ensure that the available steam matches the requirements of the heater for proper operation.
  3. Airflow Capacity: Consider the airflow capacity of the steam duct heater, typically measured in cubic feet per minute (CFM) or cubic meters per hour (m³/h). The airflow capacity should align with the air volume requirements of the application to achieve the desired heating effect.
  4. Material Construction: Steam Duct Heaters are typically manufactured using materials capable of withstanding high temperatures and demonstrating corrosion resistance, such as stainless steel or Incoloy. The selected materials should be appropriate for the steam environment and compatible with the air being heated.
  5. Control Options: Steam Duct Heaters can be equipped with various control options, including temperature sensors, thermostats, and compatibility with external control systems. These controls allow for precise temperature regulation and integration with the overall HVAC system.
  6. Safety Features: Look for safety features such as high-temperature limit switches and pressure relief valves to ensure safe operation and prevent overheating.
  7. Dimensions: Steam Duct Heaters come in different sizes to accommodate various ductwork configurations. The dimensions should be suitable for the available space and compatible with the existing duct system.
  8. Condensate Drainage: Proper condensate drainage is important when using steam duct heaters. Consider the specifications and requirements for condensate collection and removal to prevent water buildup in the system.

Features of Steam Duct Heaters:

  1. Efficient Heat Transfer: Steam duct heaters use a heat exchanger to transfer heat from steam to the air passing through the ducts, ensuring efficient heating.
  2. Customizable Heating Capacity: Steam duct heaters come in various sizes and capacities, allowing for precise customization to match specific heating requirements.
  3. Temperature Control: These heaters can be equipped with temperature sensors and control valves to regulate and maintain the desired temperature within the duct system.
  4. Versatility: Steam duct heaters can be used in a wide range of applications, including residential, commercial, and industrial settings, providing heating solutions for various HVAC systems.
  5. Zoning Capabilities: Steam duct heaters enable zoning capabilities, allowing independent heating of different areas or zones within a building.
  6. Safe Operation: Steam duct heaters are designed to handle high temperatures and pressures safely, ensuring reliable operation.
  7. Low Maintenance: Steam duct heaters generally require minimal maintenance, with periodic inspections and routine cleaning of the heat exchanger.
  8. Space-Saving Design: These heaters are designed to fit within the ductwork, minimizing the need for additional floor or wall space.
  9. Energy Efficiency: Steam duct heaters provide energy-efficient heating by utilizing steam as the heat source and effectively transferring the heat to the air.
  10. Integration with Building Systems: Steam duct heaters can be integrated with the building’s steam supply system, making use of the existing infrastructure and simplifying installation.

Advantages of Steam Duct Heaters:

  1. Energy-efficient heating solution.
  2. Precise customization to meet specific heating requirements.
  3. Controlled and consistent temperature within the duct system.
  4. Versatile application across various residential, commercial, and industrial settings.
  5. Zoning capabilities for targeted heating and energy savings.
  6. Safe operation with appropriate design for handling high temperatures and pressures.
  7. Low maintenance requirements, resulting in reduced downtime and costs.
  8. Space-saving design that integrates into the existing HVAC system.
  9. Utilization of steam as a readily available heat source.
  10. Simplified installation and integration with the building’s steam supply system.

 

Hot Water Duct Heaters

Hot water duct heaters are similar to steam duct heaters but use hot water instead of steam. They are typically used in public and industrial applications where hot water is readily available. Hot water duct heaters are energy-efficient and can produce high temperatures. However, they require a hot water supply and may only suit some buildings.

Hot Water Duct Heaters

Application:

Hot Water Duct Heaters find application in various heating systems where hot water is available as a heat source. Some common applications include:

  1. Commercial Buildings: Hot Water Duct Heaters find frequent applications in commercial establishments like offices, schools, hospitals, and hotels. They offer a cost-effective solution for space heating and ensuring pleasant indoor temperatures.
  2. Industrial Processes: They can be employed in industrial processes where hot air is required for drying, curing, or other manufacturing applications. Industries such as food processing, textile production, and chemical manufacturing often utilize hot water duct heaters for their heating needs.
  3. HVAC Systems: Hot Water Duct Heaters can be integrated into HVAC systems as a heating component. They help provide warm air for ventilation and distribute heat throughout the building.

Specifications:

When it comes to Hot Water Duct Heaters, the specifications can vary depending on the particular model and manufacturer. Here are several typical specifications to take into account:

  1. Heating Capacity: Hot Water Duct Heaters are available in different heating capacities, typically measured in BTU (British Thermal Units) per hour. The heating capacity should be chosen based on the required heat output for the specific application.
  2. Hot Water Flow Rate and Temperature: The specifications should include the acceptable hot water flow rate and temperature ranges. It is important to ensure that the available hot water matches the requirements of the heater for optimal heat transfer.
  3. Airflow Capacity: Consider the airflow capacity of the hot water duct heater, typically calculated in cubic feet / minute or cubic meters per hour (m³/h). The airflow capacity should align with the air volume requirements of the application to achieve the desired heating effect.
  4. Material Construction: Hot Water Duct Heaters are typically constructed with materials that can withstand high temperatures and resist corrosion, such as stainless steel or copper. The materials used should be suitable for the hot water environment and compatible with the air being heated.
  5. Control Options: Hot Water Duct Heaters can be equipped with various control options, including temperature sensors, thermostats, and compatibility with external control systems. These controls allow for precise temperature regulation and integration with the overall HVAC system.
  6. Safety Features: Look for safety features such as high-temperature limit switches and pressure relief valves to ensure safe operation and prevent overheating.
  7. Dimensions: Hot Water Duct Heaters come in different sizes to accommodate various ductwork configurations. The dimensions should be suitable for the available space and compatible with the existing duct system.
  8. Water Connection: Consider the specifications and requirements for water connections, including inlet and outlet sizes, to ensure compatibility with the available hot water supply.

Features of Hot Water Duct Heaters:

  1. Efficient Heat Transfer: The heating process in hot water duct heaters involves the utilization of a heat exchanger to transfer heat coming from the hot water to the air flowing through the ducts. This mechanism ensures efficient heating by effectively transferring heat energy.
  2. Customizable Heating Capacity: Hot water duct heaters come in various sizes and capacities, allowing for precise customization to match specific heating requirements.
  3. Temperature Control: These heaters can be integrated with temperature sensors and control valves to regulate and maintain the desired temperature within the duct system.
  4. Versatility: Hot water duct heaters can also be used in a wide variety of applications, including residential, commercial, and industrial settings, providing heating solutions for various HVAC systems.
  5. Zoning Capabilities: Hot water duct heaters enable zoning capabilities, allowing independent heating of different areas or zones within a building.
  6. Safe Operation: Hot water duct heaters operate at lower temperatures compared to other heating methods, reducing the risk of fire or overheating.
  7. Low Maintenance: Hot water duct heaters generally require minimal maintenance, with periodic inspections and routine cleaning of the heat exchanger.
  8. Space-Saving Design: These heaters are designed to fit within the ductwork, minimizing the need for additional floor or wall space.
  9. Energy Efficiency: Hot water duct heaters provide energy-efficient heating by utilizing hot water as the heat source and effectively transferring the heat to the air.
  10. Integration with Building Systems: Hot water duct heaters can be integrated with the building’s hot water supply system, making use of the existing infrastructure and simplifying installation.

Advantages of Hot Water Duct Heaters:

  1. Energy-efficient heating solution.
  2. Precise customization to meet specific heating requirements.
  3. The controlled and consistent temperature within the duct system.
  4. Versatile application across various residential, commercial, and industrial settings.
  5. Zoning capabilities for targeted heating and energy savings.
  6. Safe operation with lower operating temperatures.
  7. Low maintenance requirements, resulting in reduced downtime and costs.
  8. Space-saving design that integrates into the existing HVAC system.
  9. Utilization of hot water as a readily available heat source.
  10. Simplified installation and integration with the building’s hot water supply system.

Indirect-Fired Duct Heaters

Indirect-fired duct heaters are used where the heated air must be kept separate from the fuel source. They are typically used in clean rooms or applications where combustion byproducts must be kept separate from the wild perspective. Indirect-fired duct heaters are energy-efficient and can produce high temperatures. However, they require a separate combustion chamber and may not be ready for all buildings.

Indirect-Fired Duct Heaters

Application:

Indirect-Fired Duct Heaters find application in various heating systems where clean air is essential, or the exhaust gases from combustion must be kept separate from the heated airstream. Some common applications include

  1. Commercial and Industrial Buildings: Indirect-Fired Duct Heaters are mostly applied in commercial and industrial settings, such as warehouses, manufacturing facilities, and large office buildings. They provide clean, heated air without the potential for contamination from combustion byproducts.
  2. Clean Room Environments: In applications that require high levels of air cleanliness, such as laboratories, pharmaceutical production facilities, or clean rooms, indirect-fired duct heaters are often utilized. They ensure that the heated air remains free from any potential contaminants.
  3. Ventilation Systems: Indirect-Fired Duct Heaters can be integrated into ventilation systems to provide heating capabilities. This is useful in applications where fresh outside air needs to be preheated before being distributed into a building or space.

Specifications:

The specifications of Indirect-Fired Duct Heaters can vary depending on the specific model and manufacturer. Here are some common specifications to consider:

  1. Heating Capacity: Indirect-Fired Duct Heaters are available in different heating capacities, typically measured in BTU (British Thermal Units) per hour. The heating capacity should be chosen based on the required heat output for the specific application.
  2. Fuel Type: Indirect-Fired Duct Heaters can utilize natural gas, propane, or other fuels as the external heat source. The choice of fuel should be based on availability, cost, and compatibility with the heating system.
  3. Efficiency: Consider the efficiency rating of the indirect-fired duct heater, typically represented as a percentage. Higher efficiency units convert a larger portion of the fuel’s energy into heat, resulting in lower operating costs.
  4. Airflow Capacity: The airflow capacity of the indirect-fired duct heater should be considered, typically measured in cubic feet / minute (CFM) or cubic meters per hour (m³/h). The airflow capacity should align with the air volume requirements of the application to achieve the desired heating effect.
  5. Control Options: Indirect-Fired Duct Heaters can be equipped with various control options, including temperature sensors, thermostats, and compatibility with external control systems. These controls allow for precise temperature regulation and integration with the overall HVAC system.
  6. Safety Features: Look for safety features such as flame monitoring, gas pressure switches, and high-temperature limit switches. These features ensure safe and reliable operation.
  7. Dimensions: Indirect-Fired Duct Heaters come in different sizes to accommodate various ductwork configurations. The dimensions should be suitable for the available space and compatible with the existing duct system.
  8. Venting Requirements: Indirect-Fired Duct Heaters require proper venting to exhaust combustion byproducts. The venting system should comply with local codes and regulations.
  9. Electrical Requirements: Consider the electrical requirements, such as voltage and phase, to ensure compatibility with the available power supply.

Features of Indirect-Fired Duct Heaters:

  1. Indirect Heating: Indirect-fired duct heaters utilize a separate combustion chamber to generate heat, which is then transferred to the air passing through the heat exchanger within the duct.
  2. Customizable Heating Capacity: Indirect-fired duct heaters are available in various sizes and capacities, allowing for precise customization to match specific heating requirements.
  3. Temperature Control: These heaters can be equipped with temperature sensors and control systems to regulate and maintain the desired temperature within the duct system.
  4. Versatility: Indirect-fired duct heaters can be used in a wide range of applications, including residential, commercial, and industrial settings, providing heating solutions for various HVAC systems.
  5. Zoning Capabilities: Indirect-fired duct heaters enable zoning capabilities, allowing independent heating of different areas or zones within a building.
  6. Safe Operation: The combustion process takes place in a separate chamber, ensuring that the products of combustion, including combustion byproducts and gases, are kept away from the airstream, resulting in safe and clean operation.
  7. Low Maintenance: Indirect-fired duct heaters generally require minimal maintenance, with routine inspections and occasional cleaning of the heat exchanger.
  8. Space-Saving Design: These heaters are designed to fit within the ductwork, minimizing the need for additional floor or wall space.
  9. Energy Efficiency: Indirect-fired duct heaters provide energy-efficient heating by transferring heat from the combustion chamber to the air passing through the heat exchanger.
  10. Integration with Building Systems: Indirect-fired duct heaters can be integrated with the building’s fuel supply system and ventilation system, simplifying installation and ensuring compatibility with the existing infrastructure.

Advantages of Indirect-Fired Duct Heaters:

  1. Efficient and clean heating solution.
  2. Precise customization to meet specific heating requirements.
  3. Controlled and consistent temperature within the duct system.
  4. Versatile application across various residential, commercial, and industrial settings.
  5. Zoning capabilities for targeted heating and energy savings.
  6. Safe operation with separation between combustion products and the airstream.
  7. Low maintenance requirements, resulting in reduced downtime and costs.
  8. Space-saving design that integrates into the existing HVAC system.
  9. Energy-efficient operation by utilizing heat transfer from the combustion chamber.
  10. Simplified installation and integration with the building’s fuel supply and ventilation systems.

 

How to get the Heating Capacity of duct heaters

The heating capacity of a duct heater is the amount of heat energy it can make. It is essential to determine the heating capacity required for a specific application to ensure that the duct heater can meet the heating demands of the space. Factors such as room size, heat loss, and desired temperature rise must be considered when calculating the heating capacity.

To determine the heating capacity required, you need to calculate the heat loss of the space. Heat loss is the energy lost from the area due to insulation, ventilation, and weather conditions. A heat loss calculation considers the space’s size, the insulation level, the number of windows, and the desired indoor temperature.

Once you have determined the heat loss of the space, you can calculate the heating capacity required to meet the heating demands. The heating capacity is calculated by multiplying the heat loss by the desired temperature rise and the correction factor for the specific application. The correction factor considers the airflow rate, air temperature, and the duct heater’s efficiency.

 

How to get actual Sizing of duct heaters

Accurate sizing of duct heaters is crucial to ensure optimal performance and energy efficiency. Large duct heaters will consume excess energy and lead to higher operating costs, while undersized duct heaters will not provide sufficient heating and may result in discomfort.

To size a duct heater, you need to consider the airflow rate, the temperature of the air entering the heater, and the desired temperature rise. The size of the duct determines the airflow rate, and the air velocity temperature of the air going into the heater is the exact temperature of the air in the chimney before it passes through the heater. The desired temperature rise is the increase in temperature required to meet the heating demands of the space.

Once you have determined the airflow rate, the temperature of the air entering the heater, and the desired temperature rise, you can select a duct heater with the appropriate heating capacity. It is vital to note that the duct heater’s physical size must also be considered when sizing it to ensure it fits into the ductwork.

 

Conclusion

In conclusion, duct heaters provide efficient, controlled, and versatile heating solutions for various applications. Whether it’s electric, gas-fired, hot water, or indirect-fired duct heaters, understanding their features, advantages, and specifications allows for informed decision-making to meet specific heating requirements. By selecting the right duct heater, one can achieve optimal comfort, energy efficiency, and performance in their HVAC system.

Selecting the right duct heater requires careful consideration of its heating capacity and sizing. Properly sizing a duct heater will ensure optimal performance and energy efficiency, resulting in lower operating costs and a comfortable indoor environment. You should consult a professional HVAC contractor like HASTECO to determine the heating capacity and size of the duct heater required for your specific application.

I have another article about duct heater material, welcome to read it.

Sales representive Luke

Luke

As the devoted CEO of Hasteco, I've spent countless years nurturing my passion for heating elements. Warmly inviting you to connect & collaborate for cozy, tailor-made solutions. Get in touch!

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