Roberts Gorden CRV-B-2, CRV-B-8, CRV-B-6, CRV-B-4 service manual Flow Loading, Radiant Branch Flow

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CRV-SERIES DESIGN MANUAL

SECTION 5: FLOW LOADING

The patented CRV-Series burner system allows a number of burners to be installed in-series, in the same radiant tube, resulting in a long, continuous radi- ant emitting surface to give even heat distribution within the building.

To enable the burners to be correctly located within the system, to maintain system operating vacuum and obtain design flue gas temperatures at the pump, the design layout is based on a simplified flow principle using a “flow unit.”

The flow unit is defined as the amount of fuel/air mix- ture for a heat input of 10,000 (Btu/h). This corre- sponds to a flow rate of 1.83 cfm at 65-70°F.

For the purpose of design, flow units enter the CRV- Series system in one of two ways:

•Through the burner.

•Through the end vent plate.

Flow units exit the system as spent products of com- bustion via the pump.

The purpose of the end vent air is to dilute the hot combustion gases at the burner, thereby promoting uniform heating of the tube while avoiding excessive heating of the combustion chamber.

For the end burner, the burner inlet flow consists of the end vent air and combustion air. For all other

burners, the burner inlet flow consists the of the total of the end vent air plus the combustion gases from all upstream burners.

The requirement for minimum burner inlet flow is met if the total flow units entering the combustion chamber meets or exceeds the minimum as shown on Page 12, Table 1.

5.1 Radiant Branch Flow

The flow in a radiant branch consists of the end vent flow units plus the flow units of combustion air from all burners. Page 13, Figure 14 shows a representation of flow units for various types of branches.

The limiting factor for maximum flow in the radiant sec- tion has been determined experimentally in terms of the maximum burner inlet flow units that can be toler- ated without degradation of combustion characteris- tics at the last downstream burner. If more than the maximum number of burners are installed per radiant branch, the vacuum loss across the additional burners will increase appreciably.

This maximum flow in the radiant branch can be expressed for each burner firing rate by either a maxi- mum number of burners per branch or the maximum number of flow units. See Page 12, Table 1.

Table 1: CORAYVAC® Design Parameters

Burner Model

B-2

B-4

B-6

B-8

B-9*

B-10

B-12A

B-12

 

 

 

 

 

 

 

 

 

Input (Btu/h) x (1000)

20

40

60

80

90

100

110

120

 

 

 

 

 

 

 

 

 

Flow Units per Burner

2

4

6

8

9

10

12

12

 

 

 

 

 

 

 

 

 

Flow Units per End Vent

6

10

15

20

15

20

20

20

(minimum flow units entering combustion chamber)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Maximum Number of Burners per Branch

6

4

4

4

2

4

3

3

 

 

 

 

 

 

 

 

 

Maximum Number of Flow Units per Branch

18

26

39

52

33

60

56

56

 

 

 

 

 

 

 

 

 

Radiant Tube Length (average distance between burners)

 

 

 

 

 

 

 

 

Minimum (ft)

10

12.5

20

20

20

30

35

35

 

 

 

 

 

 

 

 

 

Recommended (ft)

15

20

25

30

30

40

50

50

 

 

 

 

 

 

 

 

 

Maximum (ft)

20

25

35

45

50

60

70

70

 

 

 

 

 

 

 

 

 

Minimum Distance from Burner to Downstream Elbow (ft)

5

5

10

10

10

15

15

15

 

 

 

 

 

 

 

 

 

Suggested Minimum mounting Height (ft)

8

8

8

10

10

15

15

15

 

 

 

 

 

 

 

 

 

* CRV B-9 requires first downstream tube from burner to be aluminized heat-treated.

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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 Standard Reflector ONE Side ReflectorUniversal SHIELD, Position Foot Deco Grille Sizing and Design Considerations Radiant Adjustment to Heat LossRadiant Height Adjustment Factor ExampleRadiant Distribution Average Coverage Selecting the BurnersRadiant Distribution Radiant Distribution Increased Coverage= mounting height Flow Loading Radiant Branch FlowBurner Flow Units Pump Capacity Tailpipe FlowPump Exhaust Length Requirements Minimum Radiant Tube Length Radiant Tube and TailpipeRadiant Tube Length Maximum Radiant Tube LengthCRV-Series Design Methods Design ParametersPump Model Series Maximum Loading Flow Units Per BranchAfter Each Burner Allowable Tailpipe Lengths Burner ModelSystem with EP-300 Series Pump Tailpipe Design MethodRule of Thumb Unshared Calculations 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 Control P/NRoberts Gordon Ultravac Pressure Switch Non-Pressurized AIR Supply SystemPressurized Pressurized SystemsPipe sizing Duct Design RulesBlower P/N 90707501 Performance 112 Flow Units Sample Layout for Pressurized Outside Air Systems Roberts Gordon Ultravac Design Requirements CRV-SERIES Equipment Specifications Page Maintain Clearance Side Clearance below
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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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