Low Energy Design (T2)

Question 1

types of shading

Answer 1

overhang

shuttering

Question 2

what is sunspace

Answer 2

passive solar heating concept consisting of a fully glazed room

Question 3

building regulations = Part L1A

Answer 3

whole building approach
target CO2 emissions rating
dwelling CO2 emissions rating
list design flexibility
limit effects of solar gain
post-construction quality testing

Question 4

energy performance in buildings directive

Answer 4

EP requirements
EP certificate
EP inspections

Question 5

energy certificates

Answer 5

assists rating EPC
operational rating DEC
DEC’s are required for all public buildings

Question 6

low energy building design

Answer 6

• 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

Question 7

passive solar design features

Answer 7

overhang
shutters
glazing
orientation

Question 8

low energy design features

Answer 8

insulation
renewables
triple glazing
air tightness
lighting 
aborsption refridgeeratir
annualised geothermal solar
geothermal heat pump
heat recovery ventilation
passive cooling
solar devices

Question 9

zero-energy

Answer 9

on average over the course of the year

no imported energy

Question 10

energy-plus homes

Answer 10

generate extra energy

Question 11

building physics

Answer 11

physics (investigates the areas of natural sciences)
thermal comfort
daylight design
energy and carbon

Question 12

main parameters of thermal comfort

Answer 12

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)

Question 13

Humidity

Answer 13

how saturated the air is
less than 30% = static shocks
less than 25% = dry eye
over 80% = feels sticky

Question 14

how to reduce the feeling of being sticky

Answer 14

increase air speed
reduce clothing level
reduce metabolic activity

Question 15

mean radiant tempertaure

Answer 15

cant measure it directly but can measure operative temperature

Question 16

air velocity

Answer 16

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

Question 17

building energy balance = hot outside

Answer 17

fabric heat gain
solar heat gain
internal heat source 
natural ventilation
fabric heat rejection

Question 18

solar heat gains

Answer 18

solar radiation hits the glazed surface and then can

• transmission (passes through)
• absorption (warms the glass)
• reflection (bounces away)

Question 19

energy demand calculation

Answer 19

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

Question 20

scope of the energy model

regulated demands in England

Answer 20

heating 
cooling
fans, pump and controls
fixed lighting
domestic hot water