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Flashcards

LEC 4

rimshamoeen English 40 cards

Cards in this deck (40)

  1. 1Types of heat transfer?Radiation
    heat flows in electromagnetic waves from hot to cold
    Convection
    molecules of cool air absorb heat and expand, rise, and carry
    away heat
    Conduction
    heat is transferred directly through contact
  2. 2Commercial - Heating and cooling can happen from occupants, lighting, computers ++ (80 kw/h per person) TRUE OR FALSETRUE ;)
  3. 3Less construction mass of a building means?Faster cool down
    and heating cycle
    (Only ambient Air
    gets heated in
    Building )
  4. 4What can can further enhance the energy storage capacity of inner Structure?Phase Change Materials
  5. 5Comfort is based on:Heat Sources and Materials
    Location of Cooling / Ventilation
  6. 6When is thermal mass required inside of a building?Solar Heat Gain - Passive + Active Solar
  7. 7Internal and External Influences on Buildings?- Heating Load from Occupants
    - Heating Load from Lighting Computers and Other Sources
    - Lightweight – Solid Thermal Mass
    - Ventilation Wind / Pressure
    - Solar Heat Gain
    - Shading
    - Rain
  8. 8HVAC stands for Heating, Ventilation and Air Conditioning TRUE OR FALSETRUE
    c'mon >:C
  9. 9HVAC PROVIDES:Provides thermal comfort and indoor air quality
  10. 10Room air distribution means:Air delivery and removal from spaces
  11. 11System specific to the building happens in?medium to large buildings
  12. 12HVAC distribution A plenum allows?Possible air return in Light fixtures allows for cooling of fixtures and removal of excess Heat.
  13. 13Plenum is?a space for Air Circulation in the floor or ceiling.
  14. 14Heat Recovery Ventilator (HRV) is?Temperature transfer to incoming air
  15. 15Energy Recovery Ventilator (ERV) is?Temperature transfer to incoming air
    and Humidity transfer to incoming air
  16. 16what affect the heating and cooling requirements of the building?The shape of a buildings floor plate
  17. 17Often, in large and deep floor plates cooling is the major concern TRUE OR FALSETRUE NIG.
    Due to people and
    equipment providing a
    large heating load
  18. 18The stairs will NOT be positively pressurized to prevent smoke from entering for fire safety TRUE OR FALSEFALSE, THEY WILL LOSER!
    In an emergency, smoke will
    be prevented from entering
    the stairs
  19. 19CONDO have less heating load then OFFICES?YES
  20. 20In condos, in order to have tenants or suite owners pay for their own HVAC what happens?Condos and apartments will
    have a stand alone, separate
    heating and cooling system for
    every unit
  21. 21In offices typically 100% drywall or exposed ceiling is not recommended. WHY?due to acoustic problems
    that are associated with a highly reflective ceiling.
  22. 22HVAC SYSTEM What is Variable Volume Temperature (VVT)?Gas Fired Packaged Roof Mounted Equipment.
  23. 23What happens in VVT?Units are gas fired with electric cooling.
    Ductwork is distributed from the roof unit within the ceiling space to the
    spaces to be heated or cooled.
  24. 24VVT PROS?-Cost.
    -Simple system to install and operate.
    -Provide free cooling when outside air temperature permit through a built in
    economizer
  25. 25VVT CONS?-Poor temperature control over a number of individual spaces.
    -Units are outside; Maintenance can be an issue in the winter time.
    -Roof has a lot of equipment located on it, additional structural
    requirements
    -higher operating costs than the other two systems.
    -Gas piping to be installed over the roof.
    -Operating life expectancy is 12-16 years.
    -Additional Supplementary heating will be required in individual office etc.
  26. 26HVAC SYSTEM What is Closed Loop Water Source Heat Pump System?Number of small indoor mounted
    units that are electric with a high operating efficiency and Heating or cooling can be provided any time of the year for each
    individual space
  27. 27What happens in Closed Loop Water Source Heat Pump SystemHeat pumps are all connected
    on a low pressure water piping loop.
    Each heat pump has its own
    refrigeration circuit and either
    rejects heat to the water loop
    when in cooling mode or takes
    heat from the water loop when
    in the heating mode.
    The cooling tower is the only
    piece of equipment located outside.
  28. 28PROS of Closed Loop Water Source Heat Pump System?-Very Flexible.
    -Additional heat pumps can be added to the loop if use changes.
    -Very good temperature control. Maintains set point in every space.
    -Only one piece of outside equipment.
    -No central cooling plant
    -Maintenance is easier than option VVT
    -Very energy efficient.
  29. 29CONS of Closed Loop Water Source Heat Pump System?-Load sharing. Units in cooling assist units in heating. Balanced load
    -More expensive system than option 1.
    -Compressor is installed in each unit, slightly noisier than fan coils.
    -More units to service (i.e. filter compressors etc).
    -A more complex system to install than option VVT.
    -Condensate lines have to be installed to each unit.
  30. 30HVAC SYSTEM What is Fan Coil System A?Provided with a number of small indoor mounted units. Units are provided with water coils and a supply air fan.
    The two pipe system uses a supply and return piping system to each fan coil.
    This system cannot provide heating and
    cooling all year round.
  31. 31What happens in Fan Coil System B?This system can provide heating and
    cooling year round if there is a four pipe system using two supply and return systems to each fan coil. One thermostat controls each unit
  32. 32PROS of Fan Coil System B?-Flexible.
    -Additional Fan coils can be added to the loop if the internal characteristics of the
    building change.
    -Reasonable temperature control.
    -Only one piece of outside equipment.
    -Maintenance is easier than option VVT and loop water
    -Energy efficient
  33. 33CONS of Fan Coil System B?-More expensive system than option VVT & Loop water
    -More units to service (i.e. filters etc).
    -Can not provide heating or cooling year round.
    -A more complex system to install than option loop water & VVT
    -Condensate lines have to be installed to each unit
  34. 34HVAC SYSTEM FORCED AIR PROS?Ducting system can also be used for air conditioning
    Many heat sources can be used although electricity required for fans
    Forced air provides quickest response to temp change
  35. 35HVAC SYSTEM FORCED AIR CONS?Ducting requires a lot of space and must be pre-planned in design of building
    Potential loss of heat due to long duct runs
    May create temp swings more noticeable then hot water
    Not ideal for People with Allergies
  36. 36HVAC SYSTEM Whats is LAKE WATER COOLING?3 intake pipes draw water from
    5 kilometres off shore of Lake
    Ontario at a depth of 83 metres
    Cold water comes to the John Street
    pumping station
    Provides alternate air conditioning
  37. 37HVAC SYSTEM How does GEOTHERMAL work?The geothermal system
    consists of 280 wells located
    under the building. Each well
    is almost 121 m (396 ft.) deep
    and contains a closed loop of
    glycol.
  38. 38Toronto Frost Level?1200mm
  39. 39HVAC SYSTEM WHAT IS SOLAR PV?Production of on site Electricity
    and Storage or Grid Feed.
  40. 40HVAC SYSTEM WHAT IS SOLAR HYDRONIC?Production of on site Hot Water where in the Evacuated Tube Hot Water Heat transfer at the top of the tubes can be direct hot
    water supply or secondary loop post heat exchanger

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Flashcards on LEC 4, created by rimshamoeen on 01/04/2015.
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rimshamoeen
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