Roberts Gorden CRV-B-9 service manual Radiant Tube and Tailpipe, Radiant Tube Length

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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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Contents Design Manual Page Roberts-Gordon LLC Page Table of Figures Page Concept Safety CRV-SERIES SystemZero Regulator Assembly Overview Two Branch System Shown Fuel Savings and Comfort Clearances to combustibles at all times for safety ONE Side Reflector Standard ReflectorUniversal SHIELD, Position Foot Deco Grille Radiant Height Adjustment Factor Radiant Adjustment to Heat LossSizing and Design Considerations ExampleRadiant Distribution Selecting the BurnersRadiant Distribution Average Coverage Radiant Distribution Increased Coverage= mounting height Radiant Branch Flow Flow LoadingBurner Flow Units Pump Capacity Tailpipe FlowPump Exhaust Length Requirements Radiant Tube Length Radiant Tube and TailpipeMinimum Radiant Tube Length Maximum Radiant Tube LengthPump Model Series Maximum Loading Design ParametersCRV-Series Design Methods Flow Units Per BranchAllowable Tailpipe Lengths Burner Model After Each BurnerRule of Thumb Unshared Calculations Tailpipe Design MethodSystem with EP-300 Series Pump To Calculate the Total System TailpipeDamper Couplings Possible Damper Coupling Locations Example System Layout Option Example CRV-SERIES System Layouts12 m 10 3 m 20 6 m 12 m Tailpipe 10 3 m 100 30 m Example System Layout Option 7, 8 Roberts Gordon System Control Control MethodsRoberts Gordon Ultravac Corayvac Modulating ControlsMS/TP Wiring Analog Signal Modulating ThermostatPressure Switch Spst Transformer Relay Kit P/N 90417600KPressurized AIR Supply SystemNon-Pressurized Pressurized SystemsPipe sizing Duct Design RulesBlower P/N 90707501K Performance 112 Flow Units Sample Layout for Pressurized Outside Air Systems Roberts Gordon Ultravac Design Requirements CRV-SERIES Equipment Specifications
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CRV-B-9 specifications

The Roberts Gordon CRV-B-9 is a state-of-the-art infrared radiant heater designed for industrial and commercial heating applications. Renowned for its efficiency and effectiveness, the CRV-B-9 represents a significant advancement in the world of space heating solutions.

One of the main features of the CRV-B-9 is its advanced infrared technology, which allows for precise heating without the necessity of warming the entire space. This targeted heating provides immediate comfort, as it directly warms objects and people rather than the air around them, making it particularly effective in large warehouses, manufacturing facilities, and retail spaces.

The heater boasts an impressive output of up to 80,000 BTUs, making it suitable for a wide range of applications. It utilizes natural gas as fuel, which contributes to its efficiency and cost-effectiveness. With a robust design and durable construction, the CRV-B-9 is built to withstand the rigors of industrial environments while ensuring a long product lifespan.

Another significant characteristic of the CRV-B-9 is its ability to integrate with advanced control systems. This includes compatibility with programmable thermostats and energy management systems, allowing for optimized temperature control and reduced energy consumption. The heater can be adjusted to suit different operational needs, making it a flexible solution for various heating scenarios.

The CRV-B-9 also features a compact design, allowing for easy installation in a variety of spaces. Its low-profile shape and modular capability enable users to arrange multiple units to achieve the desired heating coverage without compromising floor space, a crucial aspect for busy, high-traffic areas.

Safety is a priority with the CRV-B-9, which is equipped with various safety features such as a flame safety cutoff switch and over-temperature protection. These mechanisms ensure safe operation, providing peace of mind for users in demanding environments.

In summary, the Roberts Gordon CRV-B-9 infrared radiant heater stands out for its innovative technology, impressive output, energy efficiency, and safety features. Its flexibility and robust design make it an ideal choice for businesses looking to enhance comfort while minimizing energy costs. Whether in a manufacturing plant or a retail outlet, the CRV-B-9 provides a reliable and effective heating solution.
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