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A FEW YEARS EXPERIENCE OF ENERGY CONSUMPTION OF A HIGH SCHOOL IN BUDAPEST
Istvan Gärtner
Math and physics teacher ARPAD Secondary Grammar School – Budapest
ARPAD Secondary Grammar School – 2015 (founded in 1902)
A FEW YEARS EXPERIENCE OF ENERGY CONSUMPTION OF A HIGH SCHOOL IN - - PowerPoint PPT Presentation
A FEW YEARS EXPERIENCE OF ENERGY CONSUMPTION OF A HIGH SCHOOL IN - - PowerPoint PPT Presentation
A FEW YEARS EXPERIENCE OF ENERGY CONSUMPTION OF A HIGH SCHOOL IN BUDAPEST Istvan Grtner Math and physics teacher ARPAD Secondary Grammar School Budapest 18th August 2015 ARPAD Secondary Grammar School 2015 (founded in 1902) Aims
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Aims of this work
Presentation of the energy data – appearance in the field of education The analysis of the data Interpretation of the data using didactic examples Energy-saving options
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Features of the building
- No air-conditioning
- Central heating – District Heating
Plants of Budapest
- Electric power – Budapest Electricity
Works Company
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Data for energy consumption
Consumption of electrical and thermal energy - based on meter readings Period: April 2012 – March 2015 All types of energy in GJ unit Show details: Annual and quarterly data charts Energy values per class and per capita
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ANALYSIS AND INTERPRETATION OF DATA
Consumption of Energy
663 737 721 2779 2250 2836
500 1000 1500 2000 2500 3000 04/2012 - 03/2013 04/2013 - 03/2014 04/2014 - 03/2015
Year Energy value (GJ)
Electrical energy Thermal energy
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- ratio of electrical and thermal energy → 1:4
↓ 1:3 ↓ mild winter (2013-14) – temperature 2.5°C higher than the average
- electrical energy consumption increased
↓ new IT room
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Consumption of energy
136 97 222 208 62 14 1154 1549
200 400 600 800 1000 1200 1400 1600 1800 04/2012 - 06/2012 07/2012 - 09/2012 10/2012 - 12/2012 01/2013 - 03/2013
Year Energy value (GJ)
Electrical energy Thermal energy
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Consumption of energy
170 115 219 233 128 7 881 1234
200 400 600 800 1000 1200 1400 04/2013 - 06/2013 07/2013 - 09/2013 10/2013 - 12/2013 01/2014 - 03/2014
Year Energy value (GJ)
Electrical energy Thermal energy
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Consumption of energy
156 116 207 241 129 20 1027 1660
200 400 600 800 1000 1200 1400 1600 1800 04/2014 - 06/2014 07/2014 - 09/2014 10/2014 - 12/2014 01/2015 - 03/2015
Year Energy value (GJ)
Electrical energy Thermal energy
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- periodicity
- separable seasons
- 5-7 times more thermal energy
was used in autumn and in winter
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Cumulative annual energy value per class and per capita
Energy value per class (GJ)
156,45 135,77 161,68
120,00 125,00 130,00 135,00 140,00 145,00 150,00 155,00 160,00 165,00 04/2012 - 03/2013 04/2013 - 03/2014 04/2014 - 03/2015
Year
Energy value per capita (GJ)
5,15 4,53 5,25
4,00 4,20 4,40 4,60 4,80 5,00 5,20 5,40 04/2012 - 03/2013 04/2013 - 03/2014 04/2014 - 03/2015
Year
≈3000 € ≈ 100 €
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TASK
- The human body can use 200 kilo calories during 10
minutes on an exercise bike in case of uniform load. Calculate how much work can be done by a high school student during half an hour on it?
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ANSWER
Q = 600 kcal = 2520 kJ = 2,52 MJ η = 0,25 (Source: Internet) W = η * Q = 0,25 * 2,52 MJ = 0,63 MJ ΣW = 30 * 0,63 MJ = 18,9 MJ What is it sufficient for? ΣW = E = 18,9 MJ = 18900 kJ = 18900000 J P = 900 W t = ΣE / P = 18900000 J / 900 W = 21000 s ≈ 5,83 h
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Time is needed to produce the energy value per capita
ΣE = 5 GJ = 5000 MJ E = 0,63 MJ x = ΣE / E = 5000 MJ / 0,63 MJ ≈ 7936 half-hour unit Σt ≈ 3968 h ≈ 165 day (without interruption)
Achievable?
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CONCLUSION
NOT!
↓
Depending on physical condition
↓
About two orders of magnitude difference
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Energy-saving options
Switching off unnecessary lights?
Central heating → Gas heating? - Is it worth? Alternative sources of energy?
- Geothermal energy
- Photovoltaic system
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What quantity of burning natural gas would produce as much thermal energy as the school needs in a year?
ΣQ = 2800 GJ = 2800000 MJ η = 0,85 L = 34 MJ/m3 V = ΣQ / (η*L) = 2800000 MJ / (0,85*34 MJ/m3)
≈ 97000 m3
Price is about 72% of total heating costs!
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PHOTOVOLTAIC SYSTEM
≈30 MWh ≈ 108 GJ
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SUMMARY
Presented and summarized energy data Interpreted data Compared them with human power → application in physics teaching
Vision – energy-saving options, alternative energy sources → didactic task ↓ raising awareness of students
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POSSIBLE?
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