Search Results - subject:"zeotropic mixtures"

Thermo-Economic Evaluation of Organic Rankine Cycles for Geothermal Power Generation Using Zeotropic Mixtures

Heberle, Florian; Brüggemann, Dieter - In: Energies 8 (2015) 3, pp. 2097-2124

power generation. The focus of this study is to analyse if an efficiency increase by using zeotropic mixtures as working … performed. For heat source temperatures between 100 and 180 °C selected zeotropic mixtures lead to an increase in second law … uncertainties regarding fluid properties of zeotropic mixtures, mainly affect the heat exchange surface. However, the influence on …

Persistent link: https://www.econbiz.de/10011203087

Performance of Siloxane Mixtures in a High-Temperature Organic Rankine Cycle Considering the Heat Transfer Characteristics during Evaporation

Weith, Theresa; Heberle, Florian; Preißinger, Markus; … - In: Energies 7 (2014) 9, pp. 5548-5565

The application of the Organic Rankine Cycle to high temperature heat sources is investigated on the case study of waste heat recovery from a selected biogas plant. Two different modes of operation are distinguished: pure electric power and combined heat and power generation. The siloxanes...

Persistent link: https://www.econbiz.de/10011031171

Solar-assisted auto-cascade heat pump cycle with zeotropic mixture R32/R290 for small water heaters

Lv, Xiaolong; Yan, Gang; Yu, Jianlin - In: Renewable Energy 76 (2015) C, pp. 167-172

In this study, a novel solar-assisted auto-cascade heat pump cycle (SAHPC) operating with the zeotropic mixture of R32/R290 for small water heaters is proposed. In the SAHPC system, a cascade heat exchanger (CHEX) associated with a phase separator is used to achieve auto cascade cycle and...

Persistent link: https://www.econbiz.de/10011189994

Selection and optimization of pure and mixed working fluids for low grade heat utilization using organic Rankine cycles

Andreasen, J.G.; Larsen, U.; Knudsen, T.; Pierobon, L.; … - In: Energy 73 (2014) C, pp. 204-213

We present a generic methodology for organic Rankine cycle optimization, where the working fluid is included as an optimization parameter, in order to maximize the net power output of the cycle. The method is applied on two optimization cases with hot fluid inlet temperatures at 120 °C and...

Persistent link: https://www.econbiz.de/10011054631

Study of zeotropic mixtures of ORC (organic Rankine cycle) under engine various operating conditions

Yang, Kai; Zhang, Hongguang; Wang, Zhen; Zhang, Jian; … - In: Energy 58 (2013) C, pp. 494-510

experimental results and theoretical calculation, effects of eight kinds of zeotropic mixtures on the performance of ORC system for …

Persistent link: https://www.econbiz.de/10011055994

The occurrence of pinch point and its effects on the performance of high temperature heat pump

Liu, Zhaoyong; Zhao, Li; Zhao, Xuezheng; Li, Hailong - In: Applied Energy 97 (2012) C, pp. 869-875

Zeotropic mixtures are popular alternatives to chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) in the … high temperature heat pump system. Zeotropic mixtures exhibit two major characteristics during phase change: temperature … nonlinear relationship between temperature and enthalpy in the two phase region for zeotropic mixtures can cause pinch points …

Persistent link: https://www.econbiz.de/10010702667

Zeotropic mixtures as working fluids in Organic Rankine Cycles for low-enthalpy geothermal resources

Heberle, Florian; Preißinger, Markus; Brüggemann, Dieter - In: Renewable Energy 37 (2012) 1, pp. 364-370

-enthalpy geothermal resources. The working fluids considered in this analysis are zeotropic mixtures. Second law efficiency of subcritical …

Persistent link: https://www.econbiz.de/10011046279

Potential of zeotropic mixtures as working fluids in organic Rankine cycles

Chys, M.; van den Broek, M.; Vanslambrouck, B.; De Paepe, M. - In: Energy 44 (2012) 1, pp. 623-632

The effect of using mixtures as working fluids in organic Rankine cycles (ORCs) is examined with a simulation model of the cycle that includes all elements of an actual installation. We consider several of the commonly used pure ORC fluids as potential components, discuss a mixture selection...

Persistent link: https://www.econbiz.de/10011053624