Roberts Gorden CRV-B-9 service manual Selecting the Burners, Radiant Distribution

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CRV-SERIES DESIGN MANUAL

EXAMPLE 2:

Given a building with a calculated heat loss of 500,000 Btu/h, what is the installed capac- ity required of a CRV-Series system mounted at 50' (15 m)?

CORAYVAC® Installed Capacity = Heat Loss x Radiant Adjustment x Height Adjustment.

For CORAYVAC® systems, a .80 radiant adjust- ment factor is used.

The height adjustment is 1% per foot over 20' (3% per meter over 6 meters), or 1.30.

∴CORAYVAC® Installed Capacity = 500,000 (Btu/h) x .80 x 1.30 = 520,000 (Btu/h).

Note in Example 2, if equipment had been convention- ally sized based on thermal output only, a nearly iden- tical input requirement would result. For mounting heights above 60' (18 m), no further correction is gen- erally necessary if the floor level radiant intensity is sufficient to establish a reserve capacity (hence, radi- ant comfort), and the heat loss

requirement is satisfied based on thermal output.

Due to the complexity of installations with mounting heights over 60' (18 m), it is advisable to contact Rob- erts-Gordon for further information regarding the spe- cific application.

4.3 Selecting the Burners

The number of burners and input for each must be specified in the design layout. The following factors should be considered when selecting burner input:

•Heat gain and distribution required.

•Mounting height.

•Flow loading restrictions.

•Length of radiant branches.

•Distance required between burners.

•Desired radiation intensity.

In general, lower burner inputs can be used for lower mounting heights and where lower heat gains are required. Higher burner inputs are used primarily with higher mounting heights and where high heat gain is required.

The number of burners required can be calculated by dividing the input rating of the selected sizes into the

calculated CRV-Series system required installed capacity.

4.4 Radiant Distribution

Radiant heat distribution at occupant level must be considered in the burner and design selection process.

Distribution of heat between radiant branches at floor level is more critical at the perimeter of buildings. This is where the heat loss is highest. Therefore, it may be possible to combine different applications of distribu- tion within the same building. The following figures show three different applications of rules to determine distribution.

4.4.1 Radiant Distribution (Average Coverage)

The aim of this distribution is to provide average or lighter than average radiant intensity and works well for general building heating. See Page 11, Figure 11. The distance between radiant branches can vary between 2.5 to 4 (or more) times the mounting height.

This distribution is commonly used in applications such as warehouses and lower heat loss areas of a building.

Lighter coverage can be used in areas where occu- pant traffic is low.

4.4.2 Radiant Distribution (Increased Coverage)

The aim of this distribution is to provide continuous radiant intensity. See Page 11, Figure 12. The distance between radiant branches is about 2 times the mounting height.

This distribution is commonly used in areas bordering high heat loss areas or areas requiring increased radi- ant intensity to achieve occupant comfort.

4.4.3 Radiant Distribution (Heavy Coverage)

The aim of this distribution is to provide increased radi- ant intensity in areas that range from sedentary work to spot heating for loading docks. See Page 11, Figure 13. The y dimensions in the diagram is the height above floor level where overlap of the radiant output will occur.

In practice, y = 6' (1.83 m) is commonly used in areas where occupant comfort doing sedentary work is an important factor. In loading bays, spot heating and areas of high heat loss, the horizontal distance (x) between branches can be as little as 0.5 times the mounting height.

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Contents Design Manual Page Roberts-Gordon LLC Page Table of Figures Page Concept CRV-SERIES System SafetyZero Regulator Assembly Overview Two Branch System Shown Fuel Savings and Comfort Clearances to combustibles at all times for safety Standard Reflector ONE Side ReflectorUniversal SHIELD, Position Foot Deco Grille Radiant Adjustment to Heat Loss Radiant Height Adjustment FactorSizing and Design Considerations ExampleSelecting the Burners Radiant DistributionRadiant Distribution Average Coverage Radiant Distribution Increased Coverage= mounting height Flow Loading Radiant Branch FlowBurner Flow Units Tailpipe Flow Pump CapacityPump Exhaust Length Requirements Radiant Tube and Tailpipe Radiant Tube LengthMinimum Radiant Tube Length Maximum Radiant Tube LengthDesign Parameters Pump Model Series Maximum LoadingCRV-Series Design Methods Flow Units Per BranchAfter Each Burner Allowable Tailpipe Lengths Burner ModelTailpipe Design Method Rule of Thumb Unshared CalculationsSystem with EP-300 Series Pump To Calculate the Total System TailpipeDamper Couplings Possible Damper Coupling Locations Example CRV-SERIES System Layouts Example System Layout Option12 m 10 3 m 20 6 m 12 m Tailpipe 10 3 m 100 30 m Example System Layout Option 7, 8 Control Methods Roberts Gordon System ControlRoberts Gordon Ultravac Corayvac Modulating ControlsAnalog Signal Modulating Thermostat MS/TP WiringPressure Switch Spst Transformer Relay Kit P/N 90417600KAIR Supply System PressurizedNon-Pressurized Pressurized SystemsDuct Design Rules Pipe sizingBlower 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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