Search results

Issues in performance measurement of CO2 compressor near the critical point.

• Author(s) : LEE J., BAIK S., CHO S. K., et al.
• Publication date: 2016/02/05
• Languages : English
• Keywords : Brayton, R744, Critical point, Performance, Refrigerant, Compressor, CO2
• Source: Applied Thermal Engineering - vol. 94

IIR document

Utilization of CO2 and R1234ze(E) as refrigerant: determination of mixture volumetric properties at the vicinity of critical point.

• Author(s) : XIE J., VALTZ A., COQUELET C., et al.
• Publication date: 2019/08/24
• Languages : English
• Keywords : Equilibrium, Measurement, R744, R1234ze(E), Thermodynamic property, Critical point, Binary mixture, Refrigerant, CO2
• Source: Proceedings of the 25^th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
• Formats : PDF

Heat transfer and various convection structures of near-critical CO2 flow in microchannels.

• Author(s) : CHEN L., ZHANG X. R.
• Publication date: 2014/11
• Languages : English
• Keywords : Microchannel, Heat transfer, Critical point, Flow, CO2
• Source: Applied Thermal Engineering - vol. 72 - n. 1

IIR document

An experimental investigation of a R-134a ejector refrigeration system.

• Author(s) : GARCÍA del VALLE J., SAIZ JABARDO J. M., CASTRO RUIZ F., et al.
• Publication date: 2014/10
• Languages : English
• Keywords : Refrigerating system, R134a, Ejector system, Critical point, Expérimentation
• Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 46
• Formats : PDF

IIR document

Experimental investigation of critical parameters for the binary mixture of CO2 + R1336mzz(Z) (cis-1,1,1,4,4,4-hexafluoro-2-butene) and analysis of critical locus for CO2 + hydrofluoroolefin systems.

• Author(s) : TANG B., YAO X., DONG X., SHENG B., ZHAO Y., SHEN J., GONG M.
• Publication date: 2024/04
• Languages : English
• Keywords : Expérimentation, Modelling, R744, CO2, Binary mixture, R1336mzz(Z), Transcritical cycle, Critical point, Critical pressure, Critical temperature, Thermodynamic property
• Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 160
• Formats : PDF

IIR document

Measurements of P?T properties, vapor pressures, saturated densities, and critical parameters for R 1234ze(Z) and R 245fa.

• Author(s) : HIGASHI Y., HAYASAKA S., SHIRAI C., et al.
• Publication date: 2015/04
• Languages : English
• Keywords : Vapour pressure, R245fa, Measurement, Density, R1234ze, Thermodynamic property, Critical point
• Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 52
• Formats : PDF

IIR document

PVT Properties, Saturated Densities, and Critical Parameters of trans-1,2-Difluoroethene (R1132(E)) + 2,3,3,3-Tetrafluoroprop-1-ene (R1234yf).

• Author(s) : SAKODA N., HIGASHI Y.
• Publication date: 2023/08/21
• Languages : English
• Keywords : Mixture, Critical density, R1132(E), R1234yf, Expérimentation, Equation of state, Thermodynamic property, Critical pressure, Critical temperature, Critical point, HFO, Low GWP
• Source: Proceedings of the 26^th IIR International Congress of Refrigeration: Paris , France, August 21-25, 2023.
• Formats : PDF

Segurança alimentar numa industria de enchidos portuguesa.

Food safety in the Portuguese pork product industry.

• Author(s) : BALTAZAR A.
• Publication date: 2016/05/03
• Languages : Portuguese
• Keywords : Food industry, Safety, Sausage, Portugal, Critical point, Control (generic), Pork product
• Source: CYTEF 2016. VIII Congreso Ibérico y VI Congreso Iberoamericano de las Ciencias y Técnicas del Frío, Coimbra-Portugal, 3-6 mayo, 2016.
• Formats : PDF

IIR document

Thermodynamic properties and critical parameters of HFO-1123 and its binary blends with HFC-32 and HFC-134a using molecular simulations.

• Author(s) : ALAM M. S., JEONG J. H.
• Publication date: 2019/08
• Languages : English
• Keywords : R134a, Measurement, R32, , Thermodynamic property, Simulation, Critical point, Binary mixture, HFO, HFC
• Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 104
• Formats : PDF

IIR document

A new statistical approach to identify critical mass flow rate in CO2 nozzles near saturation conditions.

• Author(s) : FERRANDO M., TRAVERSO A., SISHTLA V.
• Publication date: 2023/05
• Languages : English
• Keywords : Flow rate, CO2, R744, Nozzle, Critical point, Thermodynamic property, Design, Model, Calculation, Simulation
• Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 149
• Formats : PDF

IIR document

Experimental measurements and correlation of vapor-liquid equilibrium and critical data for the CO2 + R1234yf and CO2 + R1234ze(E) binary mixtures.

• Author(s) : JUNTARACHAT N., VALTZ A., COQUELET C., et al.
• Publication date: 2014/11
• Languages : English
• Keywords : R1234yf, Equilibrium, Correlation, Measurement, Liquid-vapour, R1234ze, Critical point, Binary mixture, Expérimentation, CO2
• Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 47
• Formats : PDF

IIR document

Prediction of critical properties and boiling point of fluorine/chlorine-containing refrigerants.

• Author(s) : LI Q., REN J., LIU Y., ZHOU Y.
• Publication date: 2022/11
• Languages : French
• Keywords : Refrigerant, Thermodynamic property, Machine learning, Prediction, Fluorine, Chlorine, Modelling, Calculation, Boiling, Critical temperature, Critical pressure
• Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 143
• Formats : PDF

IIR document

Enhancing heat rejection from electronic devices with a supercritical carbon dioxide minichannel heat exchanger.

• Author(s) : ROSA O. C. da, BATTISTI F. G., HOBOLD G. M., et al.
• Publication date: 2019/10
• Languages : English
• Keywords : Heat rejection, Electronic component, CFD, Minichannel, Cooling, R744, Critical point, Modelling, Heat exchanger, CO2
• Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 106
• Formats : PDF

Thermophysical property measurements of a novel R-744 blend for heat pump applications.

• Author(s) : MACNEILL M. L., SKAE C. M., LOW R. E., SEETON C. J., GRUNDI D., IHMELS C.
• Publication date: 2022
• Languages : English
• Keywords : Mixture, R744, Critical point, Low GWP, Thermodynamic property, Heat pump, Vapour pressure, Expérimentation, Modelling
• Source: 2022 Purdue Conferences. 19^th International Refrigeration and Air-Conditioning Conference at Purdue.
• Formats : PDF

IIR document

Prediction of normal boiling point and critical temperature of refrigerants by graph neural network and transfer learning.

• Author(s) : WANG G., HU P.
• Publication date: 2023/07
• Languages : English
• Keywords : Refrigerant, Thermodynamic property, Artificial neural network, Boiling, Critical temperature, Machine learning, Modelling, Prediction
• Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 151
• Formats : PDF

Brief: Industrial Refrigeration Consensus

During the Industrial RefrigerationConsensus hosted by Danfoss, held in December 2004 in Sønderborg , Denmark , the main following points were reached through workshop discussions with focus on the industrial refrigeration issues (thus the points...

• Publication date : 2005/06/14

Frost mitigation methods for heat pumps and refrigeration systems

Frost growth is an important issue since defrosting can represent up to 30% of the total energy consumption of refrigerated display cabinets. Review of the various frost mitigation technologies and latest...

• Publication date : 2021/12/15
• Subjects: Technology

H-fluid as an alternative to HFC-134a?

The new European Directive 2006/40 on emissions from air-conditioning systems in motor vehicles - which bans F-gases with a GWP higher than 150 (such as HFC-134a) as of 2011 for new models of cars - and Californian legislation which is putting...

• Publication date : 2006/11/15

Refrigerated transport: truckers’ Delight

North American truckers are set to upgrade their equipment in line with new regulations and due to strong consumer demands for better food safety. The FDA's hazard analysis critical control points (HACCP) system decrees that shippers and...

• Publication date : 2006/01/28

World

The new ISO 22000 standard "Food safety management systems - requirements for any organization in the food chain" was passed in September 2005. This standard will apply to food producers and manufacturers, transport and storage operators and...

• Publication date : 2005/10/26

Briefs: ARTI's 21st Century Research Program

During the 2004 ASHRAE Winter meeting in Anaheim, results from several research projects initiated under the ARTI (Air-Conditioning and Refrigeration Technology Institute) 21st Century Research Program - initiated by ARI (Air-Conditioning and...

• Publication date : 2004/04/28

TTI: new developments

Time-Temperature Integrators (TTIs) are "intelligent labels" that simulate bacterial development, as a function of time-and-temperature parameters. As soon as a critical threshold is crossed, a change in colour alerts the consumer that the...

• Publication date : 2006/11/15

Efficiency of ground source heat pump systems

Ground source heat pumps (GHSP) have been reported to be more efficient than more widespread air source heat pumps despite higher installation costs. A recent article has reviewed parameters impacting the energy...

• Publication date : 2021/03/29
• Subjects: Technology

IIR 2023 conference in Ohrid: focus on CO2 heat pumps

As demonstrated at the last IIR conference in Ohrid , heat pumps are a potential development area for the use of CO2, in particular for the thermal management of electric vehicles. 

• Publication date : 2023/05/26
• Subjects: Technology

Two-phase ejectors: a high potential for energy savings

Two review papers recently published in the IJR highlight ejectors as a promising solution to dramatically improve the efficiency of vapour compression refrigeration systems and outline the challenges that...

• Publication date : 2020/11/27

New standards for “intelligent” ACs implemented in China

China implements new standard to officially define and set technological requirements for intelligent ACs. Additionally, a Chinese air-conditioning manufacturer is the first company in China to achieve a global...

• Publication date : 2020/06/26
• Subjects: Regulation

Alternatives to replace R404A for refrigerated transport

With about 5 million refrigerated vehicles operating worldwide, there is active research and development focusing on identifying alternatives to R404A, which is traditionally used in truck and trailer...

• Publication date : 2020/09/04
• Subjects: HFCs alternatives

Ohrid 2019: latest technology trends for ammonia and CO2

Synthesis of several refrigerating installation case studies using ammonia and CO2 based on papers from the recent IIR conference in Ohrid.

• Publication date : 2019/05/29

A possible major step in the quest of room-temperature superconductivity

Two researcher teams have just reported experiments indicating that a hydride of lanthanum compressed to 1.7 to 1.85 million bar has a critical temperature of 250–260 K (-23 – -13°C).

• Publication date : 2019/01/31

A study ranks the investment of the European Union countries to implement the Paris Agreement

An independent study states that only three countries in Europe push in the right direction to comply with the Paris climate agreement.

• Publication date : 2017/04/03
• Subjects: Regulation, HFCs alternatives

New IIR publication: Compendium

The Food Research Institute of Prague and the IIR have co-published a compendium entitled "Thermophysical Properties of Food: Selected Fruits and Vegetables". This book presents a critical literature review of data on the freezing point, density,...

• Publication date : 2005/02/11

Another successful IIR Gustav Lorentzen conference 2016

Dedicated to natural refrigerants, mainly ammonia, carbon dioxide and hydrocarbons, Gustav Lorentzen 2016 was a great success attracting over 270 people and more than 145 papers from leading international researchers and industrialists.

• Publication date : 2016/09/14

IIR’s contribution and key outcomes at COP29

The International Institute of Refrigeration actively participated in COP29/CMP19/CMA6 held in Baku, Azerbaijan, from 11 November to 22 November 2024, contributing to key discussions and fostering discussions...

• Publication date : 2024/12/17
• Subjects: Regulation, Environment

The IIR is taking part in standardization work for TTIIs in France

Gérald Cavalier, President of Section D of the IIR’s Science and Technology Council was appointed President of the new E18A Commission of AFNOR (Association Française de Normalisation, the French Standardization Agency): “Cold chain control -...

• Publication date : 2012/08/22

Technical visit to the Tokyo fish market

At the ICCC conference last June, attendees had the opportunity to participate in technical visits, including a tour of the Tokyo fish market. Alain Le Bail, President of IIR Commission C2, joined the visit and...

• Publication date : 2024/11/15

The IIR supports operational and economic missions in Madagascar

IIR interventions and recommendations will focus on the mission’s aspects which are related to the food cold chain, including offshore fishery and continental aquaculture among others.

• Publication date : 2016/08/10

Cryogenics and Low-Temperature Physics: New Horizons and Challenges

This Focus written by Ralf Herzog*, President of the IIR’s Cryophysics, Cryoengineering commission (Commission A1) for the Newsletter of the IIR is the third in a series of presentations of the activities and hot research topics handled by the...

• Publication date : 2012/09/21

Newsletter INDEE+ | September 2023

The latest news on the INDEE+ project.

• Publication date : 2023/09/22

New president of IIR Commission C2 on food science and engineering

The IIR is proud to announce the appointment of Judith Evans, Professor at London South Bank University, as the new president of IIR Commission C2 on food science and engineering.

• Publication date : 2016/07/06

Past events: The IIR around the world, August and September 2024

A look back at the IIR’s latest events during conferences (Gustav Lorentzen, Thermag, Compressors) and during sponsored vents (CHPC).

• Publication date : 2024/10/07

Liquefied Natural Gas: production process and cold energy recovery

Liquefied natural gas (LNG) is natural gas that has been cooled to about -160 °C and turned into a liquid to facilitate transportation and storage. A typical LNG supply chain...

• Last update : 2023/06/23
• Langues : English, French
• Themes : LNG and LPG

Ice cream manufacturing, environmental impact and market data

From a physico-chemical point of view, ice cream is a complex, frozen multiphase mixture. The manufacturing process includes several stages of freezing which are described in this...

• Last update : 2023/06/30
• Langues : English, French
• Themes : Ice creams