SECTION 6: RADIANT TUBE AND TAILPIPE

SECTION 6: RADIANT TUBE AND TAILPIPE

The main purpose of the tailpipe and the radiant tube is to provide sufficient tube surface to transfer the heat from the flue gases to the tube wall where it radiates from the tube. Radiant tube is defined as the tubing between burners firing in a radiant branch, plus the radiant tubing immediately following the last down- stream burner. Tailpipe is defined as all tubing between the radiant tube and the pump.

Most of the radiant heat supplied by each burner is released from the radiant tube; the balance is released by the tailpipe. The placement of radiant tube to corre- spond to areas of major heat loss is the key to provid- ing uniform comfort levels. The use of adequate tailpipe is the key to high combustion efficiency and proper operation of the pump.

6.1 Radiant Tube Length

The considerations in the selection of the length of radiant tube include the following:

6.1.1 Minimum Radiant Tube Length

Provides for the highest level of intensity per length of radiant tube and good radiant heat uniformity between burners. More tailpipe length is required to maintain operating efficiency and pump capacity.

6.1.2 Maximum Radiant Tube Length

Provides the lowest level of intensity per length of radi- ant tube, and consequently the largest span between burners. The radiant intensity will be reduced slightly for the last 5'-10' (2-3 m) of radiant tube before the next burner.

The length of radiant tube required varies according to the burner input. Consideration has been given to the use of a standard 10' (3 m) length of tube or lengths that can be cut from same without waste. See Page 12, Table 1.

When positioning radiant tube to give the required radiant distribution, it is important to consider:

•Clearances to combustible materials.

•Lighting equipment and other suspended objects.

6.2 Tailpipe

Tailpipe provides a low level of radiant intensity per length. The length of tailpipe for systems can be varied according to the flow units in the system and the designed radiant length. Longer lengths of tailpipe will attain higher operating efficiencies and therefore con- densation will occur.

Page 16, Figure 16 relates the effect on system ther- mal efficiency of variations in radiant and tailpipe lengths. The chart was created based on test data obtained in accordance with methodology developed by the National Bureau of Standards (NBSIR 80-2110) and recommendations on flue loss calculation con- tained in ANSI Z83.20/CSA 2.34 (latest edition). Actual installation variables (gas BTU content, air tem- perature and operation cycle, etc.) may effect efficien- cies (positively or negatively). Page 16, Figure 16 is presented as a guide to the designer for information only.

NOTE: When accounting for the required tailpipe lengths during the design process, it is important to verify that the tailpipe for each branch is at least equal to the specified minimum.

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Roberts Gorden CRV-B-6, CRV-B-8 Radiant Tube and Tailpipe, Minimum Radiant Tube Length, Maximum Radiant Tube Length
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CRV-B-4, CRV-B-2, CRV-B-6, CRV-B-8 specifications

Roberts Gorden is renowned for its innovative heating solutions, particularly the CRV series of infrared radiant heaters, which include models CRV-B-2, CRV-B-4, CRV-B-6, and CRV-B-8. These heaters are designed to provide effective and efficient heating, making them ideal for various industrial, commercial, and agricultural applications.

One of the standout features of the Roberts Gorden CRV series is its advanced infrared heating technology. Unlike conventional heating systems that heat the air, infrared heaters warm objects and people directly, allowing for a more energy-efficient and comfortable environment. This makes the CRV series particularly effective in large spaces, such as warehouses, manufacturing facilities, and greenhouses.

The CRV-B models are engineered for versatility and can be mounted in various configurations, including horizontal and vertical placements, providing installation flexibility. Each model is available in different sizes and heating outputs, ensuring that users can select a unit tailored to their specific heating requirements. The CRV-B-2, for instance, is ideal for smaller spaces, while the CRV-B-8 offers higher power for larger areas.

Moreover, these heaters come equipped with advanced control systems that allow for precise temperature regulation. The units can be integrated with building management systems, enabling users to monitor and adjust settings remotely. This feature not only enhances comfort but also contributes to energy savings, as the heaters can be programmed to operate only during necessary hours.

Structural durability is another significant characteristic of the CRV series. Constructed with high-quality materials, the heaters are designed to withstand the rigors of industrial environments while maintaining optimal performance over time. The reflective surfaces enhance heat distribution, ensuring that warmth is evenly distributed throughout the space.

Safety is paramount with Roberts Gorden’s CRV heaters. They are designed with built-in safety mechanisms, including overheat protection and automatic shut-off features to prevent accidents.

Overall, the Roberts Gorden CRV-B-2, CRV-B-4, CRV-B-6, and CRV-B-8 models exemplify cutting-edge infrared heating technology, delivering effective, efficient, and reliable heating solutions tailored to diverse applications. With a combination of flexibility, advanced control capabilities, and safety features, these heaters are an excellent choice for anyone in need of powerful heating solutions.
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