renewable domestic sources Flashcards
What is the fundamental key to building ability to work with natural elements?
High thermal mass, correct orientation, well considered glazing, ventilation and shading, high levels of insulation and air tightness
These elements create a balanced, stable, and economic environment.
What is thermal mass in building design?
The ability of materials like concrete and masonry to soak up and release heat at different points of the day.
What are solar thermal systems used for?
To reduce the need for conventional water heating by using the sun’s energy to heat water.
What are flat plate collectors?
Devices used to supplement space heating by harnessing solar energy, relying on gravity feed and convection.
What is a solar hot water collector (STC)?
A system that harnesses the sun’s rays to heat water, typically consisting of a matt black solar collecting surface in a glazed frame.
What is a typical domestic scheme requirement for solar hot water collectors?
4-6 square meters of flat plate or 2-3 square meters of excavated tubes.
What are the main types of solar hot water collectors?
Flat plate collectors and excavated tube collectors.
True or False: Photovoltaic systems require direct sunlight to operate.
False
They only require daylight.
What is the efficiency of photovoltaic systems?
Around 18%.
What is the lifespan of photovoltaic systems?
25 years.
What is the primary function of ground source heat pumps?
To provide efficient heating and cooling with fewer emissions.
What is the efficiency range of ground source heat pumps?
300-400%.
What are combined heat and power (CHP) systems used for?
Converting a single fuel source into cost-effective heat and usable electricity.
List the benefits of combined heat and power systems.
- Lower raw fuel usage
- Reduced carbon dioxide emissions
- Security of energy supply
- Increased efficiency over centralized generation
- Lifespan of around 15 years
What is heat recovery?
The process of recovering heat from air generated by A/C or ventilation systems.
What is the efficiency range of heat recovery systems?
70%-90% latent heat retention.
What are earth ducts used for?
To temper intake air by drawing it through buried concrete pipes.
What are the three main types of lighting control sensors?
- Passive infrared
- Ultrasonic
- Hybrid devices
What is the purpose of chilled beams?
To provide passive cooling by using heat exchanger plates concealed in a ceiling fitting.
What is the target for carbon dioxide emissions reduction by 2050?
40% reduction.
What are some renewable energy sources mentioned for reducing building energy expenditure?
- Wind turbines
- Solar power
- Ground source heat pumps
- Geothermal heating
- Photovoltaics
Fill in the blank: A typical area for photovoltaic systems is between _______ square meters.
6.5 and 16
