Online Building Energy Logging and Benchmarking

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Online Building Energy Logging and Benchmarking

• Danish Software developed byThe Danish
  Electricity Savings Trust www.se-elforbrug.sparel
  .dk(Website in English)
• Presentation
• Poul Erik Kristensen, IEN
• Gregers Reimann, IEN
• www.ien.dk

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Contents

• Automatic data collection
• Data logger installation
• Online software
• Data export
• Costs Responsibility
• Danish Funding Scheme

www.se-elforbrug.sparel.dk(Website in English)
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Automatic Data Collection(Logging interval 15
minutes)
Data logger
Server
www.projectwebsite.com
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Data Logger Channels

• LOGGING CHANNELS
• 6 digital puls
• 16 Mbus
• 1 analogue (Volts)

IP Data Logger fromthe Danish companyKeepfocus
A/S
External view
Internal view
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Data Logger Installation

• 3 STEP INSTALLATION
• Order logger ( RM 3500)
• Pull signal cable (pulses or Mbus) between
  electricity meter and logger
• Connect logger to the internet (LAN)

NB. Some electricity meters may not give pulses
or Mbus, which requires some additional equipment
and an electrician
Automatic online logging starts!
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Data Logger Summary

• Each logger has 23 different channels
• Each logger costs about RM 3500
• As a default many energy meters give puls signals
  (e.g. 100 pulses pr. kWh) and installation is
  therefore easy, as it only requires a wire
  connection between energy meter and logger.
• The logger must be connected to the internet via
  a LAN connection
• The logger feeds all data to the server once a
  day, so the online data is max. 1 day old.

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Software and Database

• 471 buildings currently in online database(14
  January 2006)
• Public access to all the logged energy data
• No buildings are anonymous
• Benchmarking within each building type (16
  different types)
• Flexible user-defined graphic display
• Graphs can be imported directly onto other
  websites

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Online Benchmarking Units
Pie Chart(shows distribution of energy
consumption across 24 hours see explanation in
yellow box)
kWh / person(energy consumption pr. person)
kWh / m²(energy consumption pr. floor area)
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Online Functions
Sorting ascending or descending(all the columns
with yellow arrows can be clicked to sort the
data in ascending or descending order)
Graph(the graph icon can be clicked to access a
graphic display of the data)
Individual Buildings(clicking the plus icon
gives access to the energy logging of the
individual buildings, some of which also are
sub-metered)
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Online Example
Ascended Sorting
Benchmarking of office/administrations only
Average (kWh/m²) for 68 offices in database
Page 3 out of 8
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Graph Display Options

• Energy data can be displayed for- 1 day- 1
  week- 1 month- 1 year
• User-defined combination of energy meters can be
  put on same graph
• Average graphs (e.g. for all 68 offices in
  database) can be added to graph

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Graph Example 1
Comparison of total electricity of 3 identical
office buildings(the total electricity
consumption of 3 identical buildings are shown
over the course of 1 week by the three curves in
red, purple and yellow colour. Their energy
consumptions are markedly different. The two last
days are Saturday and Sunday, during which time
the buildings are completely unoccupied, yet, the
electricity consumption is still 50 or higher
than the weekday consumption, so the base load
consumption is substantial)
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Graph Example 2
Benchmarking of one office building (The
normalised electricity consumption of a
particular building, green curve, is benchmarked
against the average consumption of the 66 office
buildings in the database, blue curve, and the
167 school buildings in the database, red curve.
The base consumption of the particular building
is seen to be much higher than for the average,
but the kWh/m2/year energy index, 48, is in
between that of schools, 31, and offices, 59)
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Graph Example 3
Submetering of one office building (The annual
sub-metered electricity consumption of a
particular office building is shown. The green
colour indicates electricity consumption for
lighting, blue for IT consumption, red for
ventilation and yellow for other plug loads. The
lighting consumption is reduced during the summer
months, during which time daylighting is used)
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Data Export

• xml fileThe energy logging data can be exported
  as a xml file directly from the website for
  further analysis in spreadsheets etc.
• GraphHtml script for direct import of graphs on
  other websites. A graphical display of the data
  can hence be seamlessly and automatically
  imported onto other websites

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Costs Responsibility

• COST
• RM 3500 (logger)Negotiation possible
• for larger quantities
• Annual subscription feeNegotiation possible( RM
  300 per channel )
• Installation (1-2 hours)
• Maybe some extra equipment electrician

• RESPONSIBILITY
• The implementing agent (e.g. PTM) should ensure
  that- datalogger internet connection works-
  building information is correct (kWh, m² etc.)

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Danish Funding Scheme

• ELEC. SAVINGS TRUST
• Funded by electricity tax (0.4 sen/kWh)
• Tax only applicable for domestic and public
  buildings
• RM 55 Million annually for electricity saving
  projects
• at the Savings Trust

• ONLINE BENCHMARKING
• Free logger for A-club members
• A-club members must commit to purchasing energy
  efficient equipment when ordering new equipment

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Thank you!

• Poul Erik KristensenIEN Consultants,
  www.ien.dkOffice at Pusat Tenaga
  MalaysiaBangunan Sapura_at_Mines, 8th floorEmail
  poul_at_ien.dkPhone 0163910582