Reference no: EM133169001

N5E03 Science and Materials

Learning Outcome: Evaluate the performance of a given building in respect of its human comfort requirements.

Assignment Brief 3:

Scenario
You have recently been employed as a civil engineering technician by a local contractor. The company has recently appointed a new Managing Director. The MD is keen to improve the performance of the structures the company are designing and building and asked to carry out an investigation of the factors which influence human comfort and the thermal performance of the buildings.

Tasks

The submission comprises two related items:

Section 1 - Discuss the basic factors that affect human comfort and identify materials within in a building which can assist with achieving comfortable conditions for the inhabitants of the building.

Section 2 - Human Comfort Calculations
Human comfort factors are essential in buildings in which we occupy, therefore calculate the following to either establish values or achieve compliance;

Calculate the ‘U' value for the cavity wall shown and given performance criteria;

Values of Thermal conductivity are in W/mK;

Lightweight Plaster        -          0.18

Aerated Concrete block                 -      0.11

Insulation Board -         0.025

Brickwork                      -          0.77

Standard Thermal Resistances in m² K/W;

Internal surface             -          0.12

External surface            -          0.06

Cavity                            -          0.18

Wall Specification:

External Brick     102.5mm

Air Gap                            35mm

Concrete Block                   100mm

Lightweight          12mm Plaster

Using the information calculated, and using the information below, calculate the following;

(i) Fabric heat loss

(ii) Ventilation heat loss

(iii) Total heat loss in kilowatts

U-values
Floor 0.55
Roof 0.4
Windows 2.4
Door 1.65
Walls as calculated

A workshop with 175 watt low pressure sodium vapour lamp at 3 metres above floor.

The Sodium vapour lamp efficacy is 142.8 lumens per watt Calculate illuminance directly below and 4 m to the side of lamp

This same workshop has just taken delivery of a new milling machine. It is intended that it will operate alongside another milling machine. Concern has been raised as to what impact the new machine will have on current sound levels.

Current Machine 80dB New Machine 77dB

To ensure compliance you are to calculate the combined sound levels.