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 Gärtner Math and physics teacher ARPAD Secondary Grammar School – Budapest 18th August 2015

ARPAD Secondary Grammar School – 2015 (founded in 1902)

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

Features of the building • No air-conditioning • Central heating – District Heating Plants of Budapest • Electric power – Budapest Electricity Works Company

Data for energy consumption Consumption of electrica l 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

ANALYSIS AND INTERPRETATION OF DATA Consumption of Energy 2836 2779 3000 Energy value (GJ) 2500 2250 2000 Electrical energy Thermal energy 1500 1000 737 721 663 500 0 04/2012 - 03/2013 04/2013 - 03/2014 04/2014 - 03/2015 Year

• ratio of electrical and t hermal energy → 1:4 ↓ 1:3 ↓ mild winter (2013-14) – temperature 2.5°C higher than the average • electrical energy consumption increased ↓ new IT room

Consumption of energy 1800 1549 1600 Energy value (GJ) 1400 1154 1200 Electrical energy 1000 Thermal energy 800 600 400 222 208 136 97 62 200 14 0 04/2012 - 07/2012 - 10/2012 - 01/2013 - 06/2012 09/2012 12/2012 03/2013 Year

Consumption of energy 1400 1234 1200 Energy value (GJ) 1000 881 800 Electrical energy Thermal energy 600 400 233 219 170 128 115 200 7 0 04/2013 - 07/2013 - 10/2013 - 01/2014 - 06/2013 09/2013 12/2013 03/2014 Year

Consumption of energy 1800 1660 1600 Energy value (GJ) 1400 1200 1027 1000 Electrical energy 800 Thermal energy 600 400 241 207 156 129 116 200 20 0 04/2014 - 07/2014 - 10/2014 - 01/2015 - 06/2014 09/2014 12/2014 03/2015 Year

• periodicity • separable seasons • 5-7 times more thermal energy was used in autumn and in winter

Cumulative annual energy value per class and per capita Energy value per class (GJ) Energy value per capita (GJ) 165,00 5,40 161,68 5,25 5,15 160,00 156,45 5,20 155,00 5,00 150,00 4,80 145,00 4,53 140,00 4,60 135,77 135,00 4,40 130,00 4,20 125,00 4,00 120,00 04/2012 - 03/2013 04/2013 - 03/2014 04/2014 - 03/2015 04/2012 - 03/2013 04/2013 - 03/2014 04/2014 - 03/2015 Year Year ≈ 3000 € ≈ 100 €

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?

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

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?

CONCLUSION NOT! ↓ Depending on physical condition ↓ About two orders of magnitude difference

Energy-saving options Switching off unnecessary lights? Central heating → Gas heating? - Is it worth? Alternative sources of energy? • Geothermal energy • Photovoltaic system

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/m 3 V = ΣQ / (η*L) = 2800000 MJ / (0,85*34 MJ/m 3 ) ≈ 97000 m 3 Price is about 72% of total heating costs!

PHOTOVOLTAIC SYSTEM ≈ 30 MWh ≈ 108 GJ

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

POSSIBLE?

THANK YOU FOR YOUR ATTENTION!