Browsing NTNU Open by Author "Pachai, Alexander C."
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Application of natural refrigerants in the industrial refrigeration and heat pumps in the future
Pachai, Alexander C.; Hafner, Armin; Ciconkov, Risto (Chapter, 2022)For more than 150 years natural refrigerants have been used in various industrial applications reaching temperatures from -273°C to more than 300°C and the level of the high temperature limit is difficult to estimate at ... -
Energy efficient and climate friendly refrigeration systems onboard fishing vessels
Widell, Kristina Marianne Norne; Gabrielii, Cecilia H; Söylemez, Engin; Hazarika, Mihir Mouchum; Hafner, Armin; Khan, Muhammad Umar; Svendsen, Eirik Starheim; Nordtvedt, Tom Ståle; Tolstorebrov, Ignat; Pachai, Alexander C. (Chapter, 2023)Refrigeration systems onboard fishing vessels are necessary to keep the catch at a low temperature and to ensure long shelf life. Most refrigeration systems in the world fishing fleet still have R-22 as a working fluid, ... -
Screening of Future-Proof Working Fluids for Industrial High-Temperature Heat Pumps up to 250 °C (Part I)
Pachai, Alexander C.; Normann, Jeannett; Arpagaus, Cordin; Hafner, Armin (Chapter, 2021)If industry wants to phase out fossil steam boilers, heat pumps will have to produce steam at a temperature of about 160 °C or higher, as this is a kind of standard in current steam systems. Even 250 °C is used in some ... -
Screening of Future-Proof Working Fluids for Industrial High-Temperature Heat Pumps up to 250 °C (Part II)
Pachai, Alexander C.; Normann, Jeannett; Arpagaus, Cordin; Hafner, Armin (Chapter, 2021)With the new European Green Deal, the EU commission has committed to making Europe the world’s first climate-neutral continent. This also involves reduction of fossil fuel consumption in furnaces and boilers for the ...