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Category: Technical information associated with S&P Coil Products Trench Heaters Product Selection Heat Pipes Product Selection Part 1

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Trench Heaters & Heat Pipes - Product Selection - Part 1

MINIB Trench Heaters – Product Selection & Design Guide

Applications

Trench heating is a branch of perimeter heating in which the heaters themselves are located below floor level. The top of the heater is formed from a continuous roll-out grille which finishes flush with the floor level and hence can be walked upon or used as standing area. Trench units can be installed in false floors or in trenches within the concrete screed.

Trench heating is typically specified in zones which incorporate full height wall to floor fenestration. Not only does the window provide a source of cold draughts but it also prevents the siting of alternative intrusive heating equipment. When fitted adjacent to the window the trench heater will convect warm air upwards to prevent the cold down draught and warm the glazed surface to prevent misting.

Depending on the heat loss and type of trench heater selected, trench heating can be used in isolation or in conjunction with other forms of heating. It is particularly useful in providing additional window protection for spaces whose interior is warmed by underfloor heating pipes which themselves are incapable of preventing cold draughts.

The addition of the perimeter trench heating system will dramatically reduce the warm-up period of an underfloor heating system. During certain times of year the main heating system can be closed down allowing the trench system alone to maintain the required space temperature.

Shallow, passive trench heaters should be selected to provide additional heating. When used as the primary heat source deep trenches should be specified or the use of fan-assisted heaters considered.

Types of Trench Heater Available

All MINIB trench heaters are manufactured from a stainless steel trench to protect against corrosion, a feature uncommon in other units but invaluable in areas where moisture may collect inside the casing.

All trench heaters incorporate a heat exchanger consisting of copper tubes expanded into aluminium fins and should be c/w flexible connections on the hot water flow and return pipes, flow-setting and shut off valves and an air bleed plug. When the heaters are fan-assisted an electric heating element can be selected instead of hot water.

The top of the trench heater should be formed into an edging frame into which the aluminium, stainless steel or wooden roll-out grille is laid. This grille is easily removed in order to gain access to the inside of the trench for servicing. Grilles are available in a wide range of materials and decorative styles to match the interior space.

Heat Outputs Available

When selecting the type of trench heater required the first stage is to calculate the heat output required per linear metre. If the value is less than 350W then a shallow passive trench can be used (typically 125mm deep). If the value rises to 450W then a deep passive trench will be available (300mm deep) to provide the output. The effect of depth on output is due to the stack effect, with a taller stack above the heater drawing more air through the matrix.

Passive trench heaters are available in a variety of widths with the wider units providing for greater induced airflows and somewhat higher outputs; typical widths are 250 to 400mm. Units should always be fitted with the heat exchanger away from the window in order to optimise the output.

If heat outputs per linear metre rise above 450W then a fan assisted trench heater should be considered. Outputs of up to 1500W per linear metre are achievable with fan assisted trench heaters. In order that the noise level be minimised and that good coverage of the heat exchanger is achieved small diameter tangential fans are used.

All MINIB fan assisted trench heaters incorporate fans driven by 12V DC motors. The energy consumption of these DC motors is 80% less than AC motors used on competing products. The specific fan power achieved with these motors is only 0.1W/litre/s and noise levels in typical furnished spaces are only around 28dBA at medium speed.

Fan assisted trench heaters can also be designed to provide summer cooling in four pipe or two pipe changeover systems. This can be useful when summer solar gain through windows is high. Maximum cooling capacity should be designed around a figure of 300W per linear metre.

The width of fan assisted units can be as low as 100mm and depths of as little as 50mm are possible though typical dimensions are 250mm wide by 125mm deep.

Control

Passive trench systems can only be controlled on the water side and this control can be on/off or modulating using mixing or diverting valves. Fan assisted trench is ideally controlled on the air side whereby the fan speed can be accurately controlled by thermostats, occupancy sensors, timers etc.

Technical information associated with: SPC - S&P Coil Products - Coils, Heat Pipes, Heaters, Exchangers, Dehumidifiers, Radiant Heating, Warm Air Door Curtains & Fan Convectors
 

 

Trench Heaters Product Selection

Heat Pipes Product Selection

MINIB Trench Heating – Design Guide

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S & P Coil Products Ltd
Evington Valley Road
Leicester
LE5 5LU

Tel : 0116 2490044
Fax : 0116 2490033

Trench Heating design guide

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