GENERAL SECRETARIAT FOR INFORMATIONS SYSTEMS GSIS UNIVERSITY OF ATHENS

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GENERAL SECRETARIAT FOR INFORMATIONS SYSTEMS
(GSIS)UNIVERSITY OF ATHENS
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Site location
Central area of Athens

• Climatic characteristics
• Typical of the Mediterranean climate
• Mild and rainy winters (mean min temperature 05
  C )
• Relatively warm and dry summers (mean max
  temperature of 2935C)

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General description

• Rectangular shape measuring 115m in length and
  39m in width
• Orientation long axis South/southeast to
  North/Northwest direction
• 2 basement floors, ground floor, a mezzanine, 4
  floors
• Total floor area approx 30,000m2 (including
  basements)
• Mainly office space, in the first and second
  floors data entry rooms
• seminar rooms
• Building occupancy approx 1150 people
• Occupancy pattern 7am-4pm

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Refurbishment

• Improvement of the building envelope (shading
  southeast southwest
• facades, low e glazing in north façade, pvs
  southeast facade)
• Improvement of the HVAC heating/cooling system
• (control of heating cooling)
• Improvement of the lighting installation
  (replacement of all
• luminaires with HF lamps)
• Improvement of the indoor air quality (control
  of CO2 and humidity)
• and passive cooling (ceiling fans)
• Control monitoring of energy consumption
  indoor conditions via BEMS

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Refurbishment Total Cost

• Area before the refurbishment 30,000 m2
• Area after the refurbishment 30,000 m2

(WP9 CO2 questionnaire contract Annex 1)

• 41.3 Construction costs shading devices, low E
  glazing
• 32 Mechanical costs control of heating
  cooling
• 9.5 Electrical costs lighting fixtures, high
  efficiency lamps, sensors
• 17.2 BEMS

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Refurbishment Energy consumption
(WP9 CO2 questionnaire)

• Studies (simulations) show energy reduction 59
  for heating
• 80 for cooling reduced CO2 emissions (after
  renovation results from simulations)
• Building after renovation external shading, low
  e glazing, ceiling fans,
• night ventilation

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• Improvement of the building envelope External
  shading systems
• Final design
• 40 of external shading (40 representing the
  solar radiation being blocked by the shading
  device)
• West/southwest façade perforated metal grid ,
  dimensions 1.00 m deep x 2.30 m wide x 2.70 m
  high
• South/southeast façade overhangs (perforated
  metal sheets) 1.30 m deep

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• Improvement of the building envelope External
  shading systems

West/ Southwest façade Shading system
1.00m
Metal grid
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• Improvement of the building envelope External
  shading systems

South/ Southeast façade - shading system
1.30m
overhangs
overhangs
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• Improvement of the building envelope External
  shading systems

South/ Southeast façade - pv panels
Pv panels
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• Improvement of the building envelope - Simulation
  studies
• The existing situation (scenario B0)
• When applying external shading in the south
  west facades of the building (scenario B1)
• Comparison of the cooling/heating loads of both
  scenario to assess the energy impact of the
  shading system

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Scenario B0 Existing situation Simulation
results
Heating loads 45.2 KWh/m²a Cooling loads 61.7
KWh/m²a
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Scenario B1 Case study with external shading
Simulation results
Heating loads 50.6KWh/m²a Cooling loads 55.7
KWh/m²a
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Simulation results - Comparison

• Reduced solar gains thus reduced cooling loads
• Shading efficiency not exceeding 40, as a
  greater figure would result in
• significant reduction of the solar gains -
  therefore increased heating loads
• increased construction cost

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Proposal of a monitoring plan

• Monitoring will be carried out in order to
  evaluate the energy and environmental performance
  of the building
• The measurements are split in the following
  categories
• Fixed parameters
• Variable parameters
• Quality parameters
• Renewable energy
• Other

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Proposal of a monitoring plan

• Type of measurements
• Long term
• On a continuous basis, daily readings - duration
  of 1 year
• Included in the BEMS
• Short term
• Spot measurements for a period 1-3 days in the
  heating and cooling period
• Included in the BEMS and/or
• Carried out using special sensors or meters

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Proposal of a monitoring plan

• Fixed parameters

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Proposal of a monitoring plan

• Variable parameters

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Proposal of a monitoring plan

• Variable parameters

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Proposal of a monitoring plan

• Quality parameters

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Proposal of a monitoring plan

• Renewable energy / Other parameters

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Monitoring equipment - Meters and sensors for
short term measurements
Thermographic camera Thermovision 570
Tracer gas for the monitoring of airflows (air
change rates)
Pyranometer for the monitoring of solar
radiation (W/m2)
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Monitoring equipment BEMS for long term
measurements

• The BEMS will carry out the following
  measurements
• Energy consumption for heating and cooling
• Recording of operation hours for heating and
  cooling
• Energy consumption for lighting
• (suggested levels, independently form the users
  behaviour)
• Indoor temperature of each room
• Relative humidity
• CO2 concentration
• Lighting levels
• Ambient temperature
• Operation of the ceiling fans

• Monitoring will start at March 2007 and will have
  a duration of 1 year

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BEMS description

• All readings will be transferred to the BEMS.
  Terminal via M-Bus protocols
• The BEMS comprises
• Central communication centre of monitoring and
  control
• Local autonomous controllers
• Sensors and actuators
• Wiring between local communication centres,
  sensors and actuators
• Wireless communication between the peripheral and
  the central system

• Plans with monitoring points and zoning of areas
  in progress
• in collaboration with Algosystems