1. ČVUT v Praze Fakulta stavební Katedra technických zařízení budov ČVUT v Praze Fakulta stavební Katedra technických zařízení budov Building Services Systems 20 Renewable heat sources I

2. Renewable heat sources Solar Energy Solar Energy Passive Systems Passive Systems solar window solar window greenhouse greenhouse accumulation wall accumulation wall

3. Renewable heat sources Solar architecture Solar architecture location in the country location in the country building plan building plan thermal insulation thermal insulation balanced accumulation of the structure balanced accumulation of the structure additional heating system additional heating system minimizing of heat gains in summer by shading minimizing of heat gains in summer by shading

4. Renewable heat sources Active solar systems Active solar systems water, air collectors water, air collectors photovoltaics cells photovoltaics cells

5. Renewable heat sources Geothermal energy - Heat pumps Evaporator, compressor, condenser, reducing valve Evaporator, compressor, condenser, reducing valve Evaporator Evaporator air, water, soil air, water, soil Condensator Condensator low temperature heating, hot water, swimming pool low temperature heating, hot water, swimming pool Efficiency - Efficiency - Output/Input= avg.2,4 Output/Input= avg.2,4 http://www.geoexchange.org/frames/case_studies.htm Energy of environment Utilisation: heating, hot water Compressor Medium vapour Compressed hot vapour Liquid medium Cooled medium Evaporator Condenser Reducing valve

6. Heat pumps - alternatives of heat sources

7. Combined heat and power generation (CHP) gas engine with el.power generator gas engine with el.power generator cooling of the engine is the heat source cooling of the engine is the heat source output e.g. 42 kW heat, 25 kW electric output e.g. 42 kW heat, 25 kW electric

8. Fuel Cells In principle, a fuel cell operates like a battery. Unlike a battery, a fuel cell does not run down or require recharging. It will produce energy in the form of electricity and heat as long as fuel is supplied. A fuel cell consists of two electrodes sandwiched around an electrolyte. Oxygen passes over one electrode and hydrogen over the other, generating electricity, water and heat. http://www.esru.strath.ac.uk/E andE/Web_sites/00- 01/fuel_cells/ http://www.esru.strath.ac.uk/E andE/Web_sites/00- 01/fuel_cells/