Radiant and convective heating solutions
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Trench Heating
Discrete under floor system for combating heat losses at glazed elevations
Performance
Trench heating output will depend on tube diameter, number of elements etc. Output for the standard range of nine models is summarised below.
Outputs are based on a LPHW mean water temperature of 80°C, an entering air temperature of 20°C and a water velocity of 1 m/s.
| Model |
*Output |
Tube Diametre |
| LTU/J | 250 | 15 or 22 |
| LTU/JJ/S | 380 | 15 or 22 |
| LTU/N | 485 | 15, 22 or 28 |
| LTU/W | 645 | 22 or 28 |
| LTU/JJ | 645 | 15 or 22 |
| LTU/FF | 645 | 15 or 22 |
| LTU/FN | 805 | 15 or 22 |
| LTU/NN | 970 | 15, 22 or 28 |
| LTU/WW | 1290 | 22 or 28 |
* All outputs in watts/metre are for finned length of element and based on
LPHW 80° m.w.t., 20°C e.a.t. and 1.0m/s water velocity.
Outputs for variations in water velocities and temperature variations can be used using the correction factors listed below.
| Correction Factors | |||
| Variations in water velocity | Variations in ΔT | ||
|
Water |
Correction Factor |
ΔTm.w.t. - e.a.t. K |
Correction Factor |
| 0.08 | 0.90 | 30 | 0.38 |
| 0.10 | 0.91 | 35 | 0.47 |
| 0.15 | 0.92 | 40 | 0.57 |
| 0.25 | 0.93 | 45 | 0.67 |
| 0.28 | 0.94 | 50 | 0.77 |
| 0.30 | 0.95 | 55 | 0.88 |
| 0.35 | 0.96 | 56 | 0.90 |
| 0.50 | 0.97 | 57 | 0.93 |
| 0.75 | 0.98 | 58 | 0.95 |
| 1.00 | 0.99 | 59 | 0.98 |
| 1.35 | 1.00 | 60 | 1.00 |
| 2.00 | 1.02 | 65 | 1.12 |
| 1.03 | 70 | 1.24 | |
| 75 | 1.34 | ||
| 80 | 1.47 | ||