Aug 17, 2018 Last Updated 8:05 AM, Aug 13, 2018

Making Tracks For The Future Of HS2

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HS2 will create thousands of jobs during its construction process as well as 2000 apprenticeships. Approximately 25,000 people are needed to build the project and to support this, Network Rail are providing two state of the art colleges to train the next generation of rail engineers, located in Birmingham and Doncaster. The new pool of talent will all need to understand the challenges involved in HS electric railways of the future rather than the steam and diesels of the past. Nick Winton Divisional Manager for Reznor explains what the next generation need to know regarding the heating of train sheds.

Background

High Speed 2 (HS2) is one of the largest infrastructure projects that this country has ever seen – six times the budget of the 2012 Olympics. It will provide a new high-speed railway link between London, Birmingham, Manchester and Leeds, speeding up journeys, releasing space on crowded lines and bringing Britain closer together.

Network Rail’s high speed rail colleges will be elite institutions, defined by their focus on progression to a higher level of study - delivering truly innovative training and offering the very best in teaching and specialist equipment.

What to Consider When Heating a Rail Shed

The ways in which train care depots are utilised, often intermittently and at irregular time intervals, make the efficient use of energy extremely difficult. Therefore, consideration must be given to selecting a heating system that offers flexibility of operation at optimum efficiency.

The following factors represent some of the prime considerations when assessing the impact of any heating solution in a train care environment:

Train maintenance sheds are invariably very long and narrow with large doors opening constantly at each end, thus notoriously difficult to heat and even more difficult to keep warm. The doors often occupy the full width of the building and may be left open for many hours a day, thus creating a wind tunnel effect and cold air at high velocity is drawn through the shed. This means that air infiltration can severely disrupt comfort conditions within the interior. A heating system needs to be able to sustain a comfortable environment in these conditions and especially provide rapid recovery once the doors are closed. Air curtains over or to the side of the doors, either ambient or heated can mitigate the issue of air infiltration at the doors.

Maintenance is frequently carried out at night thus compounding the inhospitable climatic conditions and with partial occupation, it is therefore important for efficient use of energy, that the heating system can be easily and effectively zone controlled.

The mass of a train is considerable, when a cold and wet train enters the shed it creates a cold sink, the heating system needs to be able to provide rapid response to changed conditions.

Radiant Heating

The primary source of radiant energy in the natural environment is the sun. By standing in the sun's rays a feeling of warmth is experienced, whilst in the shade it feels considerably cooler. Radiant heat warms all solid objects and surfaces in its path.

Reznor has exploited this concept in its energy efficient radiant heating systems. Radiant tube heaters, mounted overhead, produce infrared radiant heat that is directed downward by a reflector. The infra-red heat passes through the air without heating it and falls on people, floors and equipment below creating comfortable all-round radiant warmth at low level, without wastefully heating the whole volume of the building or the roof space. Because radiant heat can be controlled directionally, only the occupied areas of the building need to be heated, which enables considerable energy savings to be realised.

The objective of a radiant heating system is to ensure that the people in the building are comfortably warm. By the correct application of a radiant heating system comfort levels can be optimised. Radiant heat warms objects and surfaces, increasing the mean radiant temperature and reducing the body's loss of heat to its surroundings. In addition by eliminating air movement, convective loss of heat from the body will also be reduced.

Last modified on Wednesday, 09 May 2018 10:31
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