Boiler gas conversion and energy renovation of a school building

U ovom diplomskom radu objašnjena su svojstva i upotreba prirodnog plina kao energenta za grijanje i pripremu potrošne tople vode, njegov transport i skladištenje. Glavni dio rada je proračun toplinskog opterećenja škole u Zagrebu prije i poslije energetske obnove i proračun sustava pripreme potrošne tople vode na temelju čega je projektirana plinska instalacija te je napravljen izračun godišnje potrošnje energije za grijanje. Dimenzioniranje plinske instalacije, od magistralnog plinovoda do plinskih potrošača u kotlovnici i kuhinji, izvedeno je polietilenskim i čeličnim cijevima. Polietilenske cijevi su izvedene podzemno dok su čelične izvedene nadzemno. Kao gorivo za odabrane kondenzacijske kotlove te štednjake u kuhinji koristi se prirodni plin, a njegovi produkti izgaranja odvode se kroz dimnjak.This master thesis presents the use of natural gas as an energy source for heating and preparation of domestic hot water, its transport and storage. The main part of the thesis is the calculation of the heating load before and after energy renovation of school building in Zagreb and the sizing of the domestic hot water preparation system. Based on this parameters,the gas system is designed and the annual energy consumption for space heating was calculated. The sizing of the gas installation, from the main gas pipeline to the gas consumers in the boiler room and kitchen, was performed with polyethylene and steel pipes. Pipes below ground level are made of polyethylene, while steel ones are placed above ground level. Natural gas is used as fuel for selected condensing boilers and stoves in the kitchen and its combustion flue gases are exhausted through the chimne