Industrial fluid heating requires precision, reliability, and efficiency. When your process requires consistency and control of temperature in liquids or gases, the choice of a circulation heater is an important decision, you will want to be certain that you make a decision that ensures optimal operational performance, while minimizing costs. Circulation heaters provide improved transfer of heat and temperature control with the added benefit that the fluid is continuously moving (unlike tank heating).
The difference between an efficient heating system and expensive downtime often occurs as a result of some details we did not consider. Each industrial application has different demands that require consideration of several factors. Tempsens recognises these challenges and has put together this guide to assist engineers and facility managers alike to make informed decisions!
1. Process Fluid Characteristics and Compatibility
Everything about the correct circulation heater selection is determined by the process medium. Corrosive chemicals will require different sheath materials, than clean water applications. Viscous fluids will have flow rates that need to be calculated for the proper heat transfer, where hot spots will occur if not properly calculated.
Fluid properties change as temperature increases, often changing the heating efficiency and safety margins. Some chemicals can become more aggressive at higher temperatures, while others can decompose or form substandard byproducts. Knowing the characteristics of your fluid beforehand can help you avoid big mistakes.
Tempsens Polska circulation heaters are built to handle a wide variety of process fluids: from corrosive chemicals to high-purity water systems. The secret is matching the correct materials and design to your application characteristics.
2. Temperature Requirements and Operating Range
Maximum operating temperature isn’t just about reaching your desired temperature or response; it’s also important that you are able to maintain that result at a consistent temperature while upholding the integrity of your equipment. Most circulation heaters can deliver on average to 650°F (343°C) and higher, but your specific application may require consideration of increased potential problematic conditions while considering starting, normal operating, and emergency shut down circumstances.
Uniform temperature through the entire system is as important as the maximum temperature. If your application has poor temperature distribution it may lead you to a spillage of defects, more energy being used, and contribute to premature equipment demise.
You will want to consider both steady state and transient heating needs for your specific application. Some applications require ramping up temperature quickly while other methods require ramping slowly while preserving control in order to prevent thermal shock to the product or thermal shock.
3. Flow Rate and Velocity Considerations
Correct flow rates are necessary to achieve good heat transfer performance and to avoid burnout of the elements. Low flow can create hot spots and will reduce the life of the element. High flow may be inefficient since extra pumping energy will be wasted; you may also have issues with erosion or vibration.
Most circulation heater manufacturers will provide a guideline flow velocity of between 3-5 ft/sec for heating elements. These guidelines are open to variances based on fluid properties, gęstość watów, system configuration, and environment.
The Tempsens engineering team can assist with flow rate calculations based on your application, including fluid viscosity, system pressure drop calculation, and desired energy efficiency.
4. Watt Density and Heat Flux Management
Gęstość watów, the amount of heat produced on a per square inch basis of element surface, impacts element life and system reliability. Increasing the gęstość watów can provide more compact heating, but is accompanied by higher temperatures and increased thermal stress.
Applications will dictate the appropriate approach. Clean water systems are usually good for 45-65 watts per square inch, where higher watt densities can be used for viscous, or heat-sensitive fluids only with lower power densities as they may degrade or be damaged from the effect of over-temperature.
The temperature of materiał osłony, and the effect of gęstość watów on the material, will also become more critical to long-term reliability. Tempsens circulation heaters are designed with watt densities that can sustain the required performance and also optimize longevity.
5. Sheath Material Selection
Corrosion resistance, thermal conductivity, and mechanical strength all play a role in deciding what material to sheath or encapsulate the sensor in. Most operators regard the stainless steel grades such as 316 as a good general-purpose option. Likely less people use specialized alloys such as Copper or Incoloyl that perform well in extreme chemical exposure.
Material selection does not only impact the cost of acquisition but also maintenance and replacement cycles. A more expensive alloy that lasts twice as long is often a better total cost of ownership.
The environmental factors that exist beyond the process fluid are also important. External corrosion, thermal cycling, and mechanical loading all affect material performance as well. Tempsens offers a full range of sheath materials to fulfill your specific operating conditions!
6. Pressure Ratings and System Integration
System pressure impacts mechanical design and safety. Increased pressures mean thicker walled chambers, which means a better flange connection, which contributes to both costs and space limitations.
Pressure drop across the heater contributes to the total pumping requirements for the system. Circulation heaters designed properly should provide a good reasonable heat transfer rate with a minimal pressure drop.
The installation orientation and piping connections will impact the overall integration. Some designs will work better in a horizontal configuration; other designs may be best vertically mounted.
7. Control System and Safety Features
Modern circulation heaters have a high-tech control system to maintain exact temperatures while protecting equipment and operators alike. A simple thermostat to control a circulation heater may easily be adequate for a simple application, but complex operations will typically require digital controllers, multiple control zones, and included safety systems.
These features should also include safety features such as over-temperature protection, low-flow switches, and pressure relief valves. Safety features should not be optional; they are necessary for a reliable system. Such safety features help prevent equipment failure that could injure personnel or damage equipment.
An additional consideration of integrating new circulation heaters into an existing plant’s automation controls relates to communication protocols, signals, and control algorithms. Tempsens circulation heaters can be configured with multiple control options in order to integrate with the infrastructure you already have in place.
Making the Right Choice
Selecting a circulation heater involves negotiating many technical and economic considerations. Although immersion heater vs circulation heater comparisons tend to favour circulation heaters for continuous processes, bottom line and technical performance is more about design details than the actual technology used.
Being a partner with experienced manufacturers such as Tempsens means you do not only get the right equipment, but the engineering to make it work as intended. The technical team from Tempsens can help you develop a better circulation heater choice based on over 30 years of experience with industrial heating.
Finally, the lowest capital cost does not usually give you the best value. The total cost of ownership includes the energy used, maintenance needed and reliability of the system over the length of the life of the equipment.
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FAQ: Frequently Asked Question about Industrial Heater
What is a circulation heater?
A circulation heater heats up fluids as they pass through a specifically-designed chamber that has electric heating elements and gases flowing in it. Circulation heaters allow for continuous and uniform temperature control.
How do I choose the best heating element?
When choosing a heating element you should consider the type of fluid, temperature requirements, flow rate, and chemical compatibility to select heating element materials and watt density specifications.
What are the two main types of heat?
There are two main means of heat transfer in industry: conduction (direct contact) and convection (movement of fluids), circulation heaters utilize convection.
What is the difference between a circulation heater and immersion heater?
Circulation heaters heat fluids in flowing channels/environment in closed chambers for continuous processes, while immersion heaters are inserted directly into tanks in batch heating application
