Browsing NTNU Open by Author "Wang, Ruzhu"
Now showing items 1-11 of 11
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Annual energy performance of R744 and R410A heat pumping systems
Jin, Zhequan; Eikevik, Trygve Magne; Nekså, Petter; Hafner, Armin; Wang, Ruzhu (Journal article; Peer reviewed, 2017)This work compares the annual energy performance of heat pumping systems using R744 and R410A as refrigerant. Focus is the annual energy efficiency of R744 hybrid ground-coupled heat pumping system. The hybrid system uses ... -
Development of an ammoniawater absorption-compression heat pump at high temperature operation
Ahrens, Marcel Ulrich (Doctoral theses at NTNU;2023:39, Doctoral thesis, 2022)Decarbonization of the industrial sector is one of the most important measures to tackling global warming. Energy demand and associated greenhouse gas (GHG) emissions are continuously increasing in various industrial ... -
Feasibility study of an off-grid container unit for industrial construction
Kristiansen, A. B.; Satola, Daniel; Lee, Kate; Zhao, B.; Ma, Tao; Wang, Ruzhu; Gustavsen, Arild; Novakovic, Vojislav (Peer reviewed; Journal article, 2020)This article presents solutions for improved energy efficiency by adapting a shipping container building in Shanghai for off-grid operation. While this prototype is based on a single unit, larger buildings made from multiple ... -
High Temperature Heat Pumps in Integrated Energy Systems
Ryssdal, Signe Truyen (Master thesis, 2020)Denne oppgaven er en del av første trinn i prosjektet project «Key technologies and demonstration of combined cooling, heating, and power generation for low-carbon neighborhoods/buildings with clean energy – ChiNoZEN». En ... -
Identification of Existing Challenges and Future Trends for the Utilization of Ammonia-Water Absorption–Compression Heat Pumps at High Temperature Operation
Ahrens, Marcel Ulrich; Loth, Maximilian; Tolstorebrov, Ignat; Hafner, Armin; Kabelac, Stephan; Wang, Ruzhu; Eikevik, Trygve Magne (Peer reviewed; Journal article, 2021)Decarbonization of the industrial sector is one of the most important keys to reducing global warming. Energy demands and associated emissions in the industrial sector are continuously increasing. The utilization of high ... -
Net zero greenhouse gas emission residential building concepts for warm climates
Satola, Daniel (Doctoral theses at NTNU;2024:1, Doctoral thesis, 2024)Combating climate change and reducing the environmental impacts of human activities is the most urgent and challenging science and policy issue of the current time. Over 32% of global energy use and nearly 40% of global ... -
Numerical investigation of an oil-free liquid-injected screw compressor with ammonia-water as refrigerant for high temperature heat pump applications
Ahrens, Marcel Ulrich; Tolstorebrov, Ignat; Tønsberg, Even Kristian; Hafner, Armin; Wang, Ruzhu; Eikevik, Trygve Magne (Peer reviewed; Journal article, 2022)This study investigates a numerical model of an oil-free twin screw compressor with an ammonia-water mixture as refrigerant and liquid injection. The compressor was identified as the main constraint to increase the heat ... -
Potential evaluation of integrated high temperature heat pumps: A review of recent advances
Hamid, Khalid; Sajjad, Uzair; Ahrens, Marcel Ulrich; Ren, Shuai; Palanichamy, Ganesan; Tolstorebrov, Ignat; Arshad, Adeel; Said, Zafar; Hafner, Armin; Wang, Chi-Chuan; Wang, Ruzhu; Eikevik, Trygve Magne (Peer reviewed; Journal article, 2023) -
Simplified Space-heating Distribution Using Radiators in Super-insulated Apartment Buildings
Georges, Laurent; Wen, Kang; Alonso, Maria Justo; Berge, Magnar; Thomsen, Judith; Wang, Ruzhu (Journal article; Peer reviewed, 2016)The necessity to drastically reduce the space-heating (SH) needs of residential buildings in Europe has prompted the emergence of building concepts based on a super-insulated building envelope, such as the passive house ... -
Sustainable energy in cities: methodology and results of a summer course providing smart solutions for a new district in Shanghai
Wang, Yu; Lobaccaro, Gabriele; Carlucci, Salvatore; Wang, Ruzhu; Li, Yong; Finocchiaro, Luca; Dai, Yanjun; Eikevik, Trygve Magne; Wyckmans, Annemie (Journal article; Peer reviewed, 2017)A systemic approach for integrated urban energy planning and design can increase energy efficiency, the use of renewable energy sources and bioclimatic strategies to lower the energy footprint at building, district and ... -
Thermodynamic modeling of a water injected twin screw compressor used in high temperature heat pump range
Klevjer, Martin (Master thesis, 2020)Det anslås at høytemperaturs varmepumper skal være en vesentlig del av en grønn industrisektor i fremtiden (IEA, 2020). Hovedutfordringen for høytemperaturs varmpepumper er å finne pålitelige og effektive kompressorer som ...