Multibeton Systems - Controls in General


Underfloor heating is usually characterized as having prolonged pre-heat times and a large thermal inertia. Whilst this was true in the past it cannot be said of the modern MULTIBETON system.It is of course still possible to design and install such systems and there are certain types of building where such characteristics are an advantage.

The increased standards of insulation in modern buildings have reduced by over half the heat input requirements needed in the past. This means that the temperatures required in underfloor heating systems have also reduced accordingly together with the thermal mass within the floor.

 

 

 

MULTIBETON systems operate generally with water in the temperature range of 35 to 65°C which can accommodate comfort conditions of between 16 and 21°C.

The lower heat losses of modern buildings mean that decay in temperature within the building is at a much slower rate. This means that once a building temperature is attained it is often better to maintain a lower temperature during un-occupied hours than to allow the building to cool completely. In many cases buildings will take 8-10 hours to drop by 8°C and the level of heat to maintain this reduced level can be relatively small.

Well insulated buildings react much more slowly to changes in external conditions and therefore only small changes are required over a longer period to maintain stable conditions.

MULTIBETON floor heating systems are well suited to this using much lower water temperatures and therefore a lower thermal store within the floor.

Lower operating temperatures with MULTIBETON underfloor heating means less energy is used to maintain comfort levels since there are no convection currents when the floor and the air temperature are within 4 to 5°C of each other. Compare this with normal temperature radiators which create convection and much higher ceiling or roof temperatures.

Suitable Types of Controls
Underfloor systems are better controlled by using a constant volume variable temperature circuit using proportional control.

 

The water should be constantly circulated around the floor to ensure an even distribution of heat within the building, leveling out cold areas such as external walls and windows with internal warmer areas. The circulating water temperature can be controlled from an internal detector in combination with a flow detector to maintain comfort conditions. This form of control can be for individual zones or for the complete system using averaging detectors where there are several areas to be controlled.

Where an overall control system is to be installed then ideally this should be a weather compensated and/or fully optimized on and off controller. The use of these controls means it is perfectly possible to always match the temperature of water circulating within the floor to the precise level required by the external temperature. This can be enhanced by careful zoning and the use of solar compensation where applicable.

MULTIBETON systems can be connected to both constant and variable temperature circuits where other forms of heating also form part of the system. The MULTIBETON system will always use water at a lower temperature than other forms of heating even on a compensated circuit and further local mixing to the required temperature can be simply
achieved.

Due to the large number of control systems available on the market it is not possible to give full information on every type of control available. If information on the particular type of system is not shown on our data sheets or from the control manufacturer’s literature then we would be pleased to advise on any specific system you may have in mind.