Unit 16 Principles of Public Health Engineering Assignment
| Qualification | Pearson BTEC Higher Nationals Construction |
| Unit Number | 16 |
| Unit Title | Principles of Public Health Engineering |
| Unit code | J/618/8095 |
| Unit level | 4 |
| Credit value | 15 |
Introduction
The role of a public health engineer is a very important and diverse one in the construction process. Public health engineers design systems for water supply and sanitation that help buildings work better for occupants, owners and the environment. This may vary from a drainage system in a hospital to a water-supply system in a high-rise apartment building.
This unit introduces students to the principles of public health engineering. They will develop a broad understanding of domestic hot- and cold-water services, and sanitation and rainwater systems that serve large commercial and complex multi-zone buildings.
On successful completion of this unit, students will be able to calculate, design and select appropriate pipework systems and plantroom equipment for hot- and coldwater services, and sanitation and rainwater systems for large commercial buildings.
Learning Outcomes
By the end of this unit, students will be able to:
LO1 Explain the different types of domestic water services systems and above ground drainage that serve large buildings
LO2 Identify relevant design considerations for buildings when selecting water, drainage pipework, plant and equipment
LO3 Develop sustainable design strategies for public health engineering
LO4 Design and specify water and sanitation services for large non-domestic buildings.
Essential Content
LO1 Explain the different types of domestic water services systems and above ground drainage that serve large buildings
Cold water
Sources of water (e.g., water quality, hardness, water treatment, corrosion) Distribution systems (e.g., direct, and indirect systems, boosted cold water systems, water storage, pressure reduction and control, domestic sprinkler systems)
Hot water
Hot water production (e.g., local vs central, vented and unvented, calorifiers, plate heat exchangers, local heaters)
Distribution systems (e.g., secondary circulation, pumps and balancing, trace heating, avoidance of dead legs)
Above ground drainage
Sanitary pipework systems (e.g., attributes, primary ventilated stack system, secondary ventilated stack system, ventilated and unventilated branches, stub stacks, pumped drainage systems) Kitchen and laboratory drainage
Rainwater systems
Rainwater pipework systems (e.g., gravity and siphonic systems, gutters and roof outlets, paved area drainage, sound attenuation, soakaways)
LO2 Identify relevant design considerations for buildings when selecting water, drainage pipework, plant and equipment
Cold water
Water regulations
Categories of fluid
Contamination risks
Air gaps and backflow prevention
Legionella prevention and monitoring
Disinfection and flushing of systems
Standards and codes of practice
Commissioning and maintenance
Hot water
Legionella prevention vs scalding
Thermal balancing
Hot water temperatures
Building regulations
Mixers and blending of hot water
Thermostatic control
Safety features for unvented hot water
Above ground drainage
Limits of stack system
Trap seal loss
High rise building drainage
Invert levels
Secondary venting
Air admittance valves (AAV)
Positive air pressure attenuators (PAPA)
Offsets and vent termination
Sewer capacities
Rainwater systems
Green, brown, and blue roofs
Pitched roof types
Rainfall intensities
Sustainable Urban Drainage Systems (SUDS)
Rainwater attenuation
Building regulations and codes of practice Commissioning
System testing
Balancing
Quality checks Handover
LO3 Develop sustainable design strategies for public health engineering
Certification schemes (e.g., BREEAM, LEED)
Water flow rates and leak detection methods Requirements and solutions
Water consumption and water conservation measures
Types and techniques
Hot water generation
Combined Heat and Power (CHP) Solar thermal
Grey water recycling systems
Benefits and pitfalls
Rainwater harvesting systems Requirements and uses
LO4 Design and specify water and sanitation services for large non-domestic buildings.
Cold water systems
Cold water storage requirements
Cistern sizing
Probability theory and loading units
Cold water pipe sizing
Pressure
Flow rates and velocity
Booster set sizing
Hot water systems
Hot water generator sizing
Reheat/recovery period
Storage, semi-storage or instantaneous
Hot water flow and return pipe sizing
Circulating pump size
Mass flow rate and pressure drop
Rainwater systems
Surface water run-off calculations
Storm return periods/rainfall intensities
Gutter and roof outlet sizing
Attenuation tank sizing
Learning Outcomes and Assessment Criteria
| Pass | Merit | Distinction |
| LO1 Explain the different types of domestic water services systems and above ground drainage that serve large buildings |
D1 Evaluate how different water, sanitation systems and plant choices impact on the construction and performance of a building. |
|
| P1 Identify the main hot and cold water and sanitation systems for large buildings.
P2 Describe the main plant items for water and sanitation systems. |
M1 Illustrate the operation of a hot and cold water and sanitation system for a given building type. | |
| LO2 Identify relevant design considerations for buildings when selecting water, drainage pipework, plant and equipment | ||
| P3 Explain the current legislation and codes of practice that influence the design and selection of water and sanitation systems.
P4 Discuss the health and public safety issues that must be managed through water and sanitation installations for large buildings. |
M2 Analyse the way in which industry codes of practice influence the design of water and sanitation systems. | |
| Pass | Merit | Distinction |
| LO3 Develop sustainable design strategies for public health engineering |
D2 Evaluate the impact of incorporating a sustainable public health scheme within a proposal. |
|
| P5 Explain how public health engineering solutions contribute to project sustainability.
P6 Produce a design strategy for a public health engineering installation in a given context. |
M3 Compare sustainable design strategies for public health engineering in relation to a given context. | |
| LO4 Design and specify water and sanitation services for large non-domestic buildings | ||
| P7 Explain the parameters that inform the design of public health engineering services for a given large, non-domestic building.
P8 Produce drawings and specifications for water and sanitation services in a given large, non-domestic building. |
M4 Calculate the required plant and pipe sizes for a public health engineering design proposal. | |
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