Results 31 to 40 of about 1,680,915 (216)

Objective Functions and Performance Optimization of Ocean Thermal Energy Conversion (OTEC) with CO₂-Based Binary Zeotropic Mixture Power Cycle

Journal of Marine Science and Engineering, 2023
Ocean thermal energy is a huge renewable and clean energy. For different applications of the Ocean Thermal Energy Conversion (OTEC) system, new objective functions are proposed and optimal CO2-based binary zeotropic mixtures for each objective function ...
Weixiu Shi, Yin Sun, Lisheng Pan, Linjian Song, Xiaolin Wei   +4 more
doaj   +1 more source

Theoretical analysis for flow condensation heat and mass transfer of zeotropic mixtures in a horizontal smooth tube

Thermal Science
As the increasingly serious impact of CFCs and HFCs on the environment, research on zeotropic mixtures plays an indispensable role in many industries. Especially, the study of zeotropic mixtures is essential for optimizing Liquefied Natural Gas system ...
Qin Wang, Qinglu Song, Chuantong Zhang, Bin Sun, Sai Zhou, Dechang Wang   +5 more
semanticscholar   +1 more source

Zeotropic mixtures study in plate heat exchangers and ORC systems

Applied Thermal Engineering, 2023
To our best knowledge, there are no correlations in the scientific literature to predict the twophase heat transfer coefficients of Hydrofluoroethers pure fluids and zeotropic mixtures used in plate heat exchangers. This work has allowed the development of evaporation and condensation correlations for such fluids.
Blondel, Quentin, Tauveron, Nicolas, Lhermet, Guillaume, Caney, Nadia   +3 more
openaire   +2 more sources

Exploratory Study on Carbon Dioxide Blends With Low‐GWP Working Fluids for Medium and High‐Temperature Heat Pumps Under Step Pressure

Asia-Pacific Journal of Chemical Engineering, Volume 21, Issue 1, January/February 2026.
ABSTRACT This study investigates binary zeotropic mixtures of R744 (CO₂) blended with eco‐friendly refrigerants for medium‐high temperature heat pumps, comparing them with conventional R744/R134a systems. All mixtures meet 60–80 K temperature lift requirements under low‐temperature conditions. A genetic algorithm optimized system parameters using fixed
Lingling Sun, Qixiong Tang, Huirong Wang, Xin Wang, Linlin Li, Rui Cheng, Kunfeng Liang   +6 more
wiley   +1 more source

Subcritical recuperative air-to-water heat pump with zeotropic mixtures: Comparative and performance assessment

Energy Reports, 2022
For high temperature heating, traditional single-stage air-source heat pumps suffer severe challenges in low efficiency and poor operating conditions. Heat recuperation is a simple and effective method to expand the temperature lift.
Jinxing Wu, Shoujun Sun, Qinglu Song, Dechang Wang, Dandan Sun   +4 more
doaj   +1 more source

Numerical Study of the Condensation Length of Binary Zeotropic Mixtures

Energy Procedia, 2015
AbstractHeat exchangers are the main components in refrigeration and liquefaction systems, particularly in the liquefaction of natural gas, where the gas being condensed is a multicomponent mixture. The study of the two-phase condensation region is important for the design of heat exchangers. This paper studies heat and mass transfer characteristics of
Deng, Han, Fernandino, Maria, Dorao, Carlos A.   +2 more
openaire   +1 more source

Minimum reflux calculation for multicomponent distillation in multi‐feed, multi‐product columns: Algorithms and examples

AIChE Journal, Volume 71, Issue 11, November 2025.
Abstract In this work, we present the first algorithm for identifying the minimum reboiler vapor duty requirement for a general multi‐feed, multi‐product (MFMP) distillation column separating ideal multicomponent mixtures. This algorithm incorporates our recently developed shortcut model for MFMP columns.
Zheyu Jiang, Mohit Tawarmalani, Rakesh Agrawal   +2 more
wiley   +1 more source

Flow Condensation of Low-GWP Zeotropic Mixtures Inside 5 mm OD Micro-Finned Tube

Applied Sciences, 2023
In response to stringent rules inhibiting the implementation of refrigerants with high global warming impact, alternative candidates should undergo assessments to prove their viability. The mixtures R450A and R454B, being the center of the current focus,
Nima Irannezhad, Luisa Rossetto, Andrea Diani   +2 more
doaj   +1 more source

Pareto‐Optimal Treatment of Uncertainties in Model‐Based Process Design and Operation

Chemie Ingenieur Technik, Volume 97, Issue 11-12, Page 1057-1064, November 2025.
It is described how to handle here‐and‐now (i.e., process design‐related) and wait‐and‐see (i.e., process operation‐related) decisions in a multicriteria framework. This approach exploits the adjustability for the wait‐and‐see variables while at the same time respecting optimality guarantees on process key performance indicators.
Jan Schwientek, Katrin Teichert, Jan Schröder, Johannes Höller, Norbert Asprion, Pascal Schäfer, Martin Wlotzka, Michael Bortz   +7 more
wiley   +1 more source

Improving the performance of booster heat pumps using zeotropic mixtures [PDF]

Energy, 2018
Abstract This study demonstrated an increase in the thermodynamic performance of a booster heat pump, which was achieved by choosing the working fluid among pure and mixed fluids. The booster heat pump was integrated in an ultra-low-temperature district heating network with a forward temperature of 40 °C to produce domestic hot water, by heating part
B. Zühlsdorf, W. Meesenburg, T.S. Ommen, J.E. Thorsen, W.B. Markussen, B. Elmegaard   +5 more
openaire   +1 more source