The outputs in table 1 below are for casings fitted with Aluminium Linear Grille.

1. The outputs are based on the following conditions:
Mean Water temperature 76.5 Deg.C
Ambient temperature 18.0 Deg.C
Water velocity 0.92 m/s

2. Single finned tube plus plain pipe. Apply factor 1.04. Output from one or two plain pipes, only within the casing.
(Mean water temperature 76.5 Deg.C)

 15mm pipe (w/m) 22mm pipe (w/m) 28mm pipe (w/m) 35mm pipe (w/m)
1 Pipe 30 40 50 60
2 Pipes 50 70 90 110
(One over the other)

3. Heat outputs based on tests carried out by BSRIA (Building Services Research and Information Association). For outputs for specific operating conditions, element configurations or diameter of tube please contact our sales office.

4. The ECU range of elements are constructed from 0.25mm Aluminium with closed sides to the 86mm elevation of the fin, the copper tube is expanded into collars in the centre of the fins and one end of the tube is expanded to provide a female socket to BS864, the other end is plain tube to BS2871 Part 1. The tube is not suitable for compression fittings.

5. The WSCU and XCU Elements are constructed from 0.5mm Aluminium. The fins are open on all sides, the tube is male at both ends to BS2871 Part 1. The tube is suitable for both end feed and compression fittings.

6. The WSCU and XCU range of elements have the facility of varying the fin spacing thus allowing the heat output to be drawn out over a larger area if required, ask our technical department for details.











EXAMPLE

  
Given the following:
  
Window mullions module:
 1200mm. Sill Height: 600mm.
Water temperatures:
 82/71°C.
Ambient temperature:
21°C.
Heat Loss in room:
 5450w.
Available wall length:
 9.6m
Casing Style:
 Sill Line Sloping. All pipework to be within casing.


OUTPUT PER METRE=

  5450w = 568w/m min.
 9.6m

The flow rate at a temperature drop of 11°C will be

 5450
 = 568w/m min
 4180 x 11


At this flow rate 22mm ECU elements would generally be used. (The specific heat or water is 4180 j/kg). From Table 1, output from 500mm high Sill Line Sloping Casing is 810 w/m, exceeding the minimum requirement. The approximate length of element will be
 5450
 = 6.73m
 810

Determine the cumulative factor thus:
Mean water temperature 76.5 Deg.C and Ambient temperature

21°C See Table 2.

  Factor 0.93
Flow rate 0.118kg/s. See Table 3
  Factor 0.95
Return pipe within casing.
 Factor 1.04
Cumulative factor = 0.93 x 0.95 x 1.04 = 0.918

Thus: Corrected output is 810 x 0.918 = 744 w/m
Element required will now be
 5450
 = 7.5m
 744

Element lengths could comprise of 3 @ 2000mm and 1 @ 1500mm. Allowing for bare pipe at element ends these would occupy 8.0m, fitting easily in the 9.6m of casing.

 

 

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