Built Environment

Topics: Heat, Heat transfer, Acoustics Pages: 6 (2030 words) Published: January 4, 2015
In this assignment it will look to demonstrate the significance of environmental science factors in relation to review of the new building for a College. A report should be produced that aims to assess a number of environmental conditions to ensure an acceptable indoor environment for all teaching accommodation. The College will be reviewed in relation to the built environment in respect of; thermal environment i.e. ventilation, without causing excessing air movement and humidity levels and condensation. It will also analyse factors affecting lighting including natural daylight, sound\noise from external sources to inside, internally to the outside and within the building, including building services installations and to also consider the acoustic environment to suit the activity.

The report will also analyse how the environment factors impact on human comfort. The report should be in accordance with key guidance documents such as the Building Regulations Parts E, F and L which are of relevance to the build environment.

1.1) Description of Site

This site is located in the London Borough Greenwich and the area is regarded as an urban location due to the surrounding built-up environment. The development consists of a new College building that is to be 3 storeys high with a gross internal floor area of 6,500m2. The college is encircled by Stone Wood road, Walnut Tree and the main Bronze Age Way (A2016). The surrounding areas to the college consist of a mixture of commercial & residential developments. It is important to highlight the location of the site so that the design can accommodate for noise pollution created from the above traffic routes i.e. Bronze Age Way.

2.0) Thermal Comfort

Thermal comfort is a fundamental principle in achieving optimum environmental conditions, it is necessary to provide a satisfactory thermal environment when taking into consideration the comfort of people using the building. Thermal comfort is defined in the British Standards BS EN 150 7730 as: “That condition of mind which expresses satisfaction with thermal environment” The Department for Education & Employment, 2000 outlines that heating systems to be designed & installed to maintain 18°C with in classrooms when the external temperature is below -1°C.

2.1) Factors that affect Thermal Comfort

The principle factors affecting thermal comfort are categorised as physical and personal variables (McMullan, 1998). Physical factors include; air temperature, mean radiant temperature, relative air speed, and humidity. The air temperature inside the building will vary due to the external temperature of the building and the K values of the materials that have been used to build the walls and type of insulation used. K Value is a measure of heat conductivity of the materials used. It determines how effective the material are i.e. the lower the K value the better the materials are at retaining heat. U values determine the overall heat resistance of the materials. Air temperature is also affected by the people inside the building and the activity they are carrying out.

The mean radiant temperature is the amount of radiation that enters through a building i.e. windows, walls, ceilings and floors. The air speed is the movement of air throughout the building. This can be affected by the convention in the building i.e. when the warm air enters the building and rises to the ceilings the cold air pushed downwards. Lastly the final factor that affects the thermal comfort of a building is the humidity which is defined by the HSE (Health and Safety Executive) as: “The ratio between the actual amount of water vapour in the air and the maximum amount of water vapour that the air can hold at that air temperature” The personal factors that affect thermal comfort include; age, sex and clothing. Different ages of a person will emit less heat for example an elderly person will emit less heat that a younger person. Gender is also known to...

References: HM Government, 2010, (Building Regulations 2000: Approved Document L1A: Conservation of fuel and power in new dwellings), London, NBS
Randall McMullan (April 2012). Environmental science in building. London: Palgrave Macmillan.
HSE. 2013. HSE. [ONLINE] Available at: http://www.hse.gov.uk/temperature/thermal/. [Accessed 16 November 14].
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