Floor Heating
Floor heating in industrial premises usually means hot-water pipes placed inside the concrete floor. (Electric coils or electric sheets are also used in nonindustrial premises; this is, however, not treated here.) Figure 8.60 shows a typical installation of heatpipes inside the floor. Note that the pipes are placed relatively deep down inside the concrete to help even out the surface temperature.
Floor heating has several advantages:
The heat is supplied at the floor, where it normally is most needed.
Putting heating coils or heating pipes into a concrete floor makes a heat reservoir that helps even out temperature fluctuations.
When using hot-water pipes in the floor, the water temperature is usually low (30 °C — 40 °C), so the system is well suited for low-temperature heating.
The system is noiseless and draft-free.
8.9.7.2 Surface Temperature and Heat Emission
One limitation in the use of floor heating is the surface temperature of the floor. Most people will find a floor surface temperature of more than 25 °C uncomfortable.
Heat is transmitted from the floor to the room by radiation and convection. For practical purposes, we can put the heat transfer coefficient to 8 W/m2 °C. Based on this assumption, we can make the diagram in Fig. 8.61.
FIGURE 8.59 Mixing jet ventilation. Many nozzles blow the air horizontally 3nd vertically, |
I SO mm |
Insulation |
200 mm
SO mm
FIGURE 8.60 Arrangement and typical dimensions of hot-water pipes in a concrete floor. |
Surface temperature of the floor [°C] 30 |
25 5 |
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Posted in INDUSTRIAL VENTILATION DESIGN GUIDEBOOK