Low Energy Design (T2) Flashcards
types of shading
overhang
shuttering
what is sunspace
passive solar heating concept consisting of a fully glazed room
building regulations = Part L1A
whole building approach target CO2 emissions rating dwelling CO2 emissions rating list design flexibility limit effects of solar gain post-construction quality testing
energy performance in buildings directive
EP requirements
EP certificate
EP inspections
energy certificates
assists rating EPC
operational rating DEC
DEC’s are required for all public buildings
low energy building design
- Superinsulation (incl. windows), airtightness and heat recovery ventilation
- Passive solar building design techniques or active solar technologies.
- Hot water heat recycling technologies to recover heat
- Lighting and misc. energy use is alleviated with efficient appliances.
- Thermal bridge free design: avoid heat loss and interstitial condensation
passive solar design features
overhang
shutters
glazing
orientation
low energy design features
insulation renewables triple glazing air tightness lighting aborsption refridgeeratir annualised geothermal solar geothermal heat pump heat recovery ventilation passive cooling solar devices
zero-energy
on average over the course of the year
no imported energy
energy-plus homes
generate extra energy
building physics
physics (investigates the areas of natural sciences)
thermal comfort
daylight design
energy and carbon
main parameters of thermal comfort
relative humidity
air tempertature
air velocity
mean radiant temperature
(vacation of temperature in a space, air and radiant temperature difference, localised radiation, clothing levels and metabolic rate)
Humidity
how saturated the air is
less than 30% = static shocks
less than 25% = dry eye
over 80% = feels sticky
how to reduce the feeling of being sticky
increase air speed
reduce clothing level
reduce metabolic activity
mean radiant tempertaure
cant measure it directly but can measure operative temperature
air velocity
low airspeed is comfortable 0.1-0.3 m/s
most sensible parts of the body are back of neck and ankles, so have to worry where the air is entering from
building energy balance = hot outside
fabric heat gain solar heat gain internal heat source natural ventilation fabric heat rejection
solar heat gains
solar radiation hits the glazed surface and then can
- transmission (passes through)
- absorption (warms the glass)
- reflection (bounces away)
energy demand calculation
demonstrating compliance with building regulations
determining an energy performance rating
development of an energy or carbon strategy
predicting in-use energy demands
estimating the operating cost of a building system
determine seasonal heat rejection
scope of the energy model
regulated demands in England
heating cooling fans, pump and controls fixed lighting domestic hot water
