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Mechanical Design

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Sloane Street Developments

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Overview

Mechanical building services consultants are responsible for ensuring a cost-effective, environmentally sound, sustainable design and the maintenance of energy-using elements in buildings. As such, they are essential to the Governments’ aim in reducing carbon emissions.

In order to achieve this, working closely with architects and other engineers, they make use of equipment and materials involved with: heating, air conditioning, water, drainage and plumbing , ventilation and refrigeration, public health engineering and work with utility suppliers such as those that supply gas, water and renewable sources.

Mechanical building services account for around 30% of the capital and 50% of the operating cost for a typical office, and substantially more in highly serviced buildings such as hospitals. They play a central role in creating a successful project and a successful building and are certainly the first thing noticed when not working well – e.g. cold draughts.

Service Details

HVAC

‘HVAC’ refers to Heating Ventilation and Air Conditioning, which can be used in buildings to:

  • Maintain internal air quality.
  • Regulate internal temperatures.
  • Regulate internal humidity.

It is sometimes extended to include other services, such as refrigeration (HVACR).

Internal air quality can be maintained by a combination of introducing ‘fresh’ air into the building, extracting ‘stale air’ and by filtration. Ventilation may be natural, mechanical, or mixed mode (a hybrid system). See Ventilation for more information.

Internal temperatures can be regulated by heating and cooling. Typically, this is achieved by heated water (or sometimes steam) and chilled water that is generated by boilers and chillers and then used in heating coils and cooling coils as part of the ventilation system. Alternatively, hot water may be used to supply systems such as radiators, underfloor heating and so on.

Humidity can be regulated by ventilation, dehumidification and humidification. Dehumidification is often provided alongside cooling as cooling air reduces the amount of moisture air is able to ‘hold’, resulting in condensation. ‘Close’ humidity control (to within 10%) can involve cooling and dehumidification, then re-heating and re-humidification.

Very broadly, HVAC systems can be centralised in a building, or local to the space they are serving, or a combination of both (for example, local air handling units supplied by centrally-generated cooling). They may also be connected to a wider district heating or cooling network.

They may be integrated, with heating, ventilation and air conditioning provided by a single system, for example, air handling units connected to ductwork, or they may be a combination of separate systems, for example mechanical ventilation with radiators for heating and local comfort cooling units.

They may also include passive (or ‘natural’) systems such as natural ventilation.
In mechanically ventilated commercial developments, HVAC is often provided by air handling units (AHU) connected to ductwork that supplies air to and extracts air from internal spaces. Air handling units typically comprise an insulated box that might include some, or all of the following components; filter racks or chambers, a fan (or blower), heating elements, cooling elements, dehumidification, sound attenuators and dampers. Air handling units that consist of only a fan and a heating or cooling element, located within the space they are serving, may be referred to as fan coil units (FCU). See Air handling units for more information.

HVAC can consume large amounts of energy, and where possible, demand should be reduced and passive systems adopted.

Extracting internal air and replacing it with outside air can increase the need for heating and cooling. This can be reduced by re-circulating a proportion of internal air, or by heat recovery ventilation (HRV) that recovers heat from extract air and uses it to pre-heat incoming fresh air.

It is important that all aspects of HVAC systems are considered together during the design process, even where involve independent systems. This is because of the interaction between heating, cooling, humidity control and ventilation. This is particularly complicated when other elements of environmental behaviour are considered such as solar gain, natural ventilation, thermal mass, and so on.

The design of HVAC systems is generally a specialist task, undertaken by us, and because of its interaction with other elements of the building it is important that it is considered from the outset, as a fundamental part of the design process, and not an ‘add on’ at the end.

Above Ground Drainage Design

Our engineers will carry out above ground drainage designs based on the below ground drainage specification. We will ensure services stacks are kept to a minimum where possible and ensure all designs are in compliance with part H of the building regulations.

Plant Schematic Design

Plant room design drawings and schematics can be produced to suit the design in place. We can specify all equipment required, size all pipework and help with any technical questions in which commonly arise.

We also carry out existing surveys of plant rooms to enable the client to decide what equipment should be upgraded / replaced as time goes on.

Utility Connections Planning Services

We can carry out all utility connection application forms for electricity, water, gas and telecoms. We can calculate required loadings and advise on diversity and help co-ordinate install of services to suit build schedule.

Plant Schematic Design

Full M&E specification service can be provided to ensure your projects install teams adheres to building regulations and guidance notes.

Construction Supervision

Full construction supervision can be provided to ensure contractors install to design drawings, to regulations and to a good quality.

Our Clients

Constructionline Gold Member

CIBSE Low Carbon Consultants

OCDEA / DEA / NDEA Accredited Assessors

Our Offices

Birmingham 0121 232 4654
Shrewsbury 01743 296 330
Chester 01244 257 522

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