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Level 3 Domestic Plumbing and heating course revision > Phase 3 Assessment > Flashcards

Phase 3 Assessment Flashcards

1
Q

What do the EAW regulations consist of? (Electricity at Work)

A

covers the installation, testing and maintenance of commercial electrical systems.

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2
Q

What British standard should electrical installations comply with

A

BS 7671 (18th edition IET Wiring Regulations.​)

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3
Q

What is the HSE’ five-step guide to completing a risk assessment?

A

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.​

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4
Q

What are the key components to Solar Thermal?

A

-solar collector​
-differential temperature controller​
-circulating pump​
-hot water storage cylinder​
-auxiliary heat source.​

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5
Q

What are the two types of thermal​
collectors?

A

-flat plate collectors​
-evacuated tube collectors

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6
Q

What does a differential temperature control do? (connected to thermal collectors?

A
  • 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.
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7
Q

How do you work out the coefficient of performance for heat pumps?

A

Heat delivered / Compressor power​

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8
Q

What are the three types of ground source HP layout?

A

-Borehole
-Trench
-Array (Slinky)

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9
Q

What is biomass?

A

Can be animal mass or plants etc which are burnt to produce heat

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10
Q

What are the 5 stages of the Carbon cycle?

A

-Co2 released
- Co2 absorbed from atmosphere
- Plants and trees grow absorbing CO2
- Biomass is harvested
- Biomass fuel burnt

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11
Q

What are the 4 main components to a micro-combined heat + power boiler?

A

-the engine burner​
-the Stirling engine generator​
-the supplementary burner​
-the heat exchanger.​

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12
Q

What are the two methods of water conservation?

A

-rainwater harvesting​
-greywater reuse.​

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13
Q

What are the 4 stages to rainwater harvesting?

A
  • collection
  • filtration
  • storage
  • re-use
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14
Q

What is the best direction for solar collectors?

A

South

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15
Q

What is the ideal angle for a solar collector?

A

30 degrees

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16
Q

What are some considerations for having solar collectors?

A
  • Strength and condition of the roof
    -Additional forces from the wind
  • 1-2 m2 of collectors per person
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17
Q

What are the benefits of having solar?

A
  • Reduction of CO2 emissions from the property.​
  • Reduction in energy costs for the customer.​
  • low maintenance.​
    -improve the energy rating of the property.​
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18
Q

Limitations of solar thermal systems?

A
  • 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.
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19
Q

What are the benefits of GSHP?

A
  • 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​
20
Q

What are the negatives of GSHP?

A

-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​

21
Q

What are the benefits of ASHP?

A

-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​

22
Q

What are the negatives of ASHP?

A

-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​

23
Q

What to consider when installing a biomass boiler?

A
  • space for the storage of biomass material​
    -good vehicle access for deliveries​
    -biomass boilers may not be permitted in a smokeless zone.
24
Q

What are the benefits of biomass boilers?

A
  • carbon neutral installation.​
  • It uses a sustainable fuel source.​
    -The waste gases are low in nitrous oxide and there is no sulphur dioxide.​
25
Q

What are the negatives of biomass boilers?

A

-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

26
Q

What are the benefits of mCHP (micro-combined heat and power)?

A
  • 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.
27
Q

What are the negatives of mCHP (micro-combined heat and power)?

A
  • Initial installation cost is high.​
  • Not suitable for all properties.​
  • It has limited capacity for electrical generation.​
28
Q

How many litres cubed of gas can one litres of LPG make?

A

274 litres cubed

29
Q

What is kerosene also known as?

A

C2 grade 28 second viscosity oil

30
Q

What are the three most common solid fuels used in the UK?

A
  • Peat
  • Coal
  • Coke
31
Q

What are the 3 parts of a fire triangle?

A

Air, ignition and fuel

32
Q

What are the 4 main causes of incomplete combustion?

A
  • Lack of oxygen
  • Too much fuel
  • Vitiated air
  • Flame impingement
33
Q

What is building documents J?

A

Combustion appliances and fuel storage systems

34
Q

What is a regulative body for Oil?

A

OFTEC

35
Q

Which British standard covers the installation and maintenance of flues?

A

BS 5440

36
Q

What are the three types of earthing systems?

A
  • Terra-Terra
  • Terra Neutral-combined-separate
37
Q

What are the two types of flues?

A

-natural draught​
-room sealed.​

38
Q

What are the 4 main components to an open flued appliance?

A
  • Primary flue
  • Draught diverter
  • Secondary flue
  • Terminal
39
Q

If a fan is positioned on the fresh air inlet of a room sealed boiler, what type of pressure does this create?

A

Positive (blowing)

40
Q

If a fan is positioned on the combustion product’s outlet from the heat exchanger, what type of pressure does this create?

A

Negative (sucking)

41
Q

What is a class 1 type flue (open flued)?

A

Brick and masonry

42
Q

What is a class 2 type flue (open flued)?

A

Pre-cast flue blocks

43
Q

What are the three types of tests for a flue?

A

Visual inspection, Spillage test, flow test

44
Q

What is the recommended PVC cable for A3 radial circuit (max floor area 50m2)?

A

2.5 mm3

45
Q

What is the recommended PVC cable for A2 radial circuit (max floor area 75m2)?

A

4 mm3

46
Q

What voltage supply is required for three phase motor?

A

400V

Level 3 Domestic Plumbing and heating course revision (5 decks)

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