Usage of excess heat from industrial and cogenerational cooling systems

V teoretičnem delu magistrskega dela najprej pregledamo delovanje dveh različnih izvedb toplotnih črpalk, razvoj hladilnih sredstev in osnove kogeneracije. Nato smo predstavili delovanje patentirane inovativne tehnične rešitve, s katero bi povečali učinkovitost delovanja proizvodnje toplote s kogeneracijsko napravo. V inovativno tehnično rešitev je nameščen dodatni toplotni prenosnik, katerega namen je izkoriščanje odvečne toplote kogeneracijske naprave. Poleg toplotnega prenosnika in kogeneracijske naprave v sistemu z inovativno tehnično rešitvijo pridobivamo toplotno energijo še s toplotno črpalko. Ta lahko kot vir toplote uporablja odvečno toploto industrijskih hladilnih sistemov. Praktični del magistrskega dela je sestavljen iz dveh delov. Najprej smo s simulacijami v programu Aspen Plus preverili delovanje dveh različnih izvedb toplotnih črpalk. Ugotovili smo, da je bolj učinkovita toplotna črpalka z vmesnim toplotnim prenosnikom, zato smo na njej izvedli analizo občutljivosti s spreminjanjem temperature predgretih par hladilnega sredstva. Nato smo se lotili računskega dela. Izračunali smo skupno toplotno moč sistema za proizvodnjo toplote z inovativno tehnično rešitvijo in temperaturo vroče vode, ki jo vodimo v sistem za akumulacijo toplote. Na podlagi izračunane skupne toplotne moči smo izračunali letno proizvodnjo toplote sistema in količino goriva, ki ga zato porabimo. To smo primerjali s klasično proizvodnjo toplote z vročevodnimi kotli. Nazadnje smo izvedli še ekonomsko analizo investicije v sistem z inovativno tehnično rešitvijo, ki bi nadomestil obstoječo proizvodnjo toplote z vročevodnimi kotli.In the theoretical part of the master\u27s thesis we have reviewed how two different versions of heat pumps work, how refrigerants had developed through time and described principles of cogeneration. In addition, we described how a patented innovative technical solution, which would increase efficiency of heat production with cogeneration, works. The system for heat production with an innovative technical solution includes additional heat exchanger. Purpose of the additional heat exchanger is to use waste heat from a cogeneration unit. Within the system with an innovative technical solution we also produce heat with a heat pump. A heat pump can use waste heat from industrial colling systems as a heat source. The practical section of master\u27s thesis consist of two different parts. Firstly, we have simulated process schemes of two different versions of heat pumps using the program Aspen Plus. We have found out, that heat pump with an additional heat exchanger is more efficient. This conclusion led us to perform a sensitivity analysis on that version of heat pump. We have gradually increased the temperature of the refrigerant\u27s preheated steam. Moving on to the computational part of the our master\u27s thesis, we have calculated joint heat power of the system for heat production based on innovative technical solution and the temperature of water flowing into the system for heat accumulation. Based on previously calculated joint heat power of the system we have calculated annual heat production of our system and the amount of fuel used. In the terms of fuel comsumption for heat production, a comparision between the innovative technical solution and classical hot water boiler solution has been evaluated. Last, but not least, we have performed an economic analysis of the investment in the innovative technical solution, which would replace the popular system for heat production with hot water boilers