Phase 3 Assessment Flashcards
What do the EAW regulations consist of? (Electricity at Work)
covers the installation, testing and maintenance of commercial electrical systems.
What British standard should electrical installations comply with
BS 7671 (18th edition IET Wiring Regulations.)
What is the HSE’ five-step guide to completing a risk assessment?
1: Identify the hazards.
2: Decide who might be harmed and how.
Step 3: Evaluate the risks and decide on precautions.
Step 4: Record your findings and implement them.
Step 5: Review your risk assessment and update, if necessary.
What are the key components to Solar Thermal?
-solar collector
-differential temperature controller
-circulating pump
-hot water storage cylinder
-auxiliary heat source.
What are the two types of thermal
collectors?
-flat plate collectors
-evacuated tube collectors
What does a differential temperature control do? (connected to thermal collectors?
- The DTC activates the pump when there is enough solar energy and there is a demand for hot water.
- Once the cylinder is up to temperature, the DTC de-activates the pump.
How do you work out the coefficient of performance for heat pumps?
Heat delivered / Compressor power
What are the three types of ground source HP layout?
-Borehole
-Trench
-Array (Slinky)
What is biomass?
Can be animal mass or plants etc which are burnt to produce heat
What are the 5 stages of the Carbon cycle?
-Co2 released
- Co2 absorbed from atmosphere
- Plants and trees grow absorbing CO2
- Biomass is harvested
- Biomass fuel burnt
What are the 4 main components to a micro-combined heat + power boiler?
-the engine burner
-the Stirling engine generator
-the supplementary burner
-the heat exchanger.
What are the two methods of water conservation?
-rainwater harvesting
-greywater reuse.
What are the 4 stages to rainwater harvesting?
- collection
- filtration
- storage
- re-use
What is the best direction for solar collectors?
South
What is the ideal angle for a solar collector?
30 degrees
What are some considerations for having solar collectors?
- Strength and condition of the roof
-Additional forces from the wind - 1-2 m2 of collectors per person
What are the benefits of having solar?
- Reduction of CO2 emissions from the property.
- Reduction in energy costs for the customer.
- low maintenance.
-improve the energy rating of the property.
Limitations of solar thermal systems?
- may not be compatible with the existing system in the property.
- The system may not meet demand for hot water in winter.
- high initial installation costs.
- The system requires an auxiliary heat source.
What are the benefits of GSHP?
- High efficiency
- Reduction of energy bills and CO2 emissions
- No combustion in appliances
- Lower maintenance costs
- Long life span
- No fuel storage
- Offers cooling in the summer period
- More efficient than an ASHP
What are the negatives of GSHP?
-Initial high installation costs
-Potential large area of land required
-Design and installation are complex
-Unlikely to work efficiently with an existing heating system
-Refrigerants are harmful to the environment
-More expensive to install than an ASHP
What are the benefits of ASHP?
-High efficiency
-Reduction in energy bills and CO2 emissions
-No combustion in the unit
-Lower maintenance requirements
-No fuel storage
-Provides cooling in the summer period
-Cheaper and easier to install than a GSHP
What are the negatives of ASHP?
-Less efficient with the existing heating system
-Less efficient than a GSHP
-High initial costs
-Less efficient in wintertime
-Fans are noisy
-Needs to incorporate a defrost cycle to stop the exchanger from freezing in winter
What to consider when installing a biomass boiler?
- space for the storage of biomass material
-good vehicle access for deliveries
-biomass boilers may not be permitted in a smokeless zone.
What are the benefits of biomass boilers?
- carbon neutral installation.
- It uses a sustainable fuel source.
-The waste gases are low in nitrous oxide and there is no sulphur dioxide.
What are the negatives of biomass boilers?
-The transport of biomass material is expensive.
-Storage space is required for the fuel, as it is bulk-delivered.
-The control of heat is not instant.
-It requires a suitable flue system
What are the benefits of mCHP (micro-combined heat and power)?
- The production of electricity is not dependent on the direction of the property or weather conditions.
- The system generates electricity whilst producing heat.
- A feed-in tariff is available.
- It saves carbon compared to centrally generated electricity.
- It reduces the property’s carbon footprint.
What are the negatives of mCHP (micro-combined heat and power)?
- Initial installation cost is high.
- Not suitable for all properties.
- It has limited capacity for electrical generation.
How many litres cubed of gas can one litres of LPG make?
274 litres cubed
What is kerosene also known as?
C2 grade 28 second viscosity oil
What are the three most common solid fuels used in the UK?
- Peat
- Coal
- Coke
What are the 3 parts of a fire triangle?
Air, ignition and fuel
What are the 4 main causes of incomplete combustion?
- Lack of oxygen
- Too much fuel
- Vitiated air
- Flame impingement
What is building documents J?
Combustion appliances and fuel storage systems
What is a regulative body for Oil?
OFTEC
Which British standard covers the installation and maintenance of flues?
BS 5440
What are the three types of earthing systems?
- Terra-Terra
- Terra Neutral-combined-separate
What are the two types of flues?
-natural draught
-room sealed.
What are the 4 main components to an open flued appliance?
- Primary flue
- Draught diverter
- Secondary flue
- Terminal
If a fan is positioned on the fresh air inlet of a room sealed boiler, what type of pressure does this create?
Positive (blowing)
If a fan is positioned on the combustion product’s outlet from the heat exchanger, what type of pressure does this create?
Negative (sucking)
What is a class 1 type flue (open flued)?
Brick and masonry
What is a class 2 type flue (open flued)?
Pre-cast flue blocks
What are the three types of tests for a flue?
Visual inspection, Spillage test, flow test
What is the recommended PVC cable for A3 radial circuit (max floor area 50m2)?
2.5 mm3
What is the recommended PVC cable for A2 radial circuit (max floor area 75m2)?
4 mm3
What voltage supply is required for three phase motor?
400V
