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IIR document

Simplified expressions of the transfer coefficients on a partially wet absorber tube.

• Author(s) : GIANNETTI N., YAMAGUCHI S., SAITO K.
• Publication date: 2019/09
• Languages : English
• Keywords : Absorber, Falling film, Modelling, Nusselt, Mass transfer coefficient, Heat transfer coefficient, Horizontal tube
• Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 105
• Formats : PDF

Correlations for the heat and mass transfer coefficients in a structured packed bed regenerator.

• Author(s) : VARELA R. J., YAMAGUCHI S., GIANNETTI N., et al.
• Publication date: 2017/08/07
• Languages : English
• Keywords : Heat transfer coefficient, Correlation, Mass transfer coefficient, Lithium chloride, Liquid desiccant, Expérimentation
• Source: International sorption heat pump conference, ISHPC 2017, Tokyo august 7-10.

IIR document

Kernel regression for the approximation of heat transfer coefficients.

• Author(s) : LAUGHMAN C. R., QIAO H., NIKOVSKI D. N.
• Publication date: 2016/08/21
• Languages : English
• Keywords : Heat transfer coefficient, Accuracy, Simulation, Prediction, Flow
• Source: 12^th IIR Gustav Lorentzen Conference on Natural Refrigerants (GL2016). Proceedings. Édimbourg, United Kingdom, August 21st-24th 2016.
• Formats : PDF

Experimental analysis of heat and mass transfer coefficients of a liquid desiccant system.

• Author(s) : JARADAT M., ADDY J., VAJEN K., et al.
• Publication date: 2014/03/02
• Languages : English
• Keywords : Heat transfer coefficient, Dehumidification, Mass transfer coefficient, Mass transfer, Liquid, Heat transfer, Expérimentation, Desiccant
• Source: International sorption heat pump conference (ISHPC2014), College Park, United States, March 31-April 2, 2014.
• Formats : PDF

IIR document

A semi-empirical correlation for the estimation of the second virial coefficients of refrigerants.

• Author(s) : DI NICOLA G., COCCIA G., PIERANTOZZI M., et al.
• Publication date: 2016/08
• Languages : English
• Keywords : Correlation, Coefficient, Expérimentation, Equation of state, Refrigerant
• Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 68
• Formats : PDF

IIR document

Heat transfer coefficients during laminar flow of microencapsulated PCM fluid.

• Author(s) : BIALKO B., NALEPA B., HALON T., ZAJACZKOWSKI B.
• Publication date: 2023/08/21
• Languages : English
• Keywords : PCM, Heat transfer coefficient, Thermal conductivity, Encapsulation, Expérimentation, Flow rate
• Source: Proceedings of the 26^th IIR International Congress of Refrigeration: Paris , France, August 21-25, 2023.
• Formats : PDF

Evaluation of overall heat transfer coefficients for absorption and desorption processes in heat transformers.

• Author(s) : CORRALES CIGANDA J. L., CUDOK F., MEYER T., et al.
• Publication date: 2017/08/07
• Languages : English
• Keywords : Heat transfer coefficient, Mass transfer coefficient, Absorption, Heat pump, Expérimentation, Desorption, Heat exchanger, Water-lithium bromide
• Source: International sorption heat pump conference, ISHPC 2017, Tokyo august 7-10.

Method for determining air side convective heat transfer coefficient using infrared thermography.

• Author(s) : WUJEK S. S., STAATS W. L., ELBEL S., et al.
• Publication date: 2016/07/11
• Languages : English
• Keywords : Infrared, Heat transfer coefficient, Measurement, Thermography, Convection
• Source: 2016 Purdue Conferences. 16th International Refrigeration and Air-Conditioning Conference at Purdue.
• Formats : PDF

Heat transfer coefficient distribution—a review of calculation methods.

• Author(s) : DUDA P.
• Publication date: 2023/05
• Languages : English
• Keywords : Heat transfer coefficient, Heat transfer, Mass transfer, CFD, Calculation, Distribution, Review
• Source: Energies - vol. 16 - n. 9
• Formats : PDF

IIR document

Nucleate boiling heat transfer coefficients of HFO1234yf on various enhanced surfaces.

• Author(s) : LEE Y., KANG D. G., KIM J. H., et al.
• Publication date: 2014/02
• Languages : English
• Keywords : R1234yf, Heat transfer coefficient, Extended surface, Substitute, Evaporator, Refrigerant, Nucleate boiling
• Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 38
• Formats : PDF

IIR document

Research on test method of heat transfer coefficient for refrigerator gasket.

• Author(s) : LIU G., YAN G., YU J.
• Publication date: 2020/02
• Languages : English
• Keywords : Heat transfer coefficient, Seal, Household refrigerator, Heat loss, Expérimentation, Insulation
• Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 110
• Formats : PDF

On the heat transfer coefficients between heated/cooled radiant ceiling and room.

• Author(s) : CHOLEWA T., ANASIEWICZ R., SIUTA-OLCHA A., et al.
• Publication date: 2017/05/05
• Languages : English
• Keywords : Radiation, Heat transfer coefficient, Design, Cooling, Ceiling, Expérimentation, Heating
• Source: Applied Thermal Engineering - vol. 117

Investigation of the dynamic heat transfer coefficient of R134a in a horizontal pipe.

• Author(s) : RÜCKERT J. P., SCHMITZ G.
• Publication date: 2014/07/14
• Languages : English
• Keywords : Two-phase flow, R134a, Pipe, Heat transfer coefficient, Simulation, Expérimentation, Refrigerant
• Source: 2014 Purdue Conferences. 15th International Refrigeration and Air-Conditioning Conference at Purdue.
• Formats : PDF

Novel visualization method to quantify local air-side heat transfer coefficient.

• Author(s) : CHE M., ELBEL S.
• Publication date: 2018/07/09
• Languages : English
• Keywords : Heat transfer coefficient, Coating (materials), Ammonia, Aluminium, Air, Plate, Expérimentation, Heat exchanger
• Source: 2018 Purdue Conferences. 17^th International Refrigeration and Air-Conditioning Conference at Purdue.
• Formats : PDF

IIR document

Calculation and experimental verification of heat transfer coefficient for low pressure methanol evaporator.

• Author(s) : HALON T., ZAJACZKOWSKI B., KRÓLICKI Z., et al.
• Publication date: 2015/08/16
• Languages : English
• Keywords : Heat transfer coefficient, Calculation, Methanol, Low pressure, Expérimentation, Evaporator, Refrigerant
• Source: Proceedings of the 24th IIR International Congress of Refrigeration: Yokohama, Japan, August 16-22, 2015.
• Formats : PDF

Briefs: Japan: refrigerant leakage larger than expected

According to a survey conducted by the Ministry of Economy, Trade and Industry (METI) of Japan, leakage of fluorinated refrigerants used in air-conditioning equipment in the country is on the average 10 times greater than estimated. METI collected...

• Publication date : 2009/08/13

CHEs in heat pumps

In its Annex 33, "Compact Heat Exchangers in Heat Pumping Equipment" issued in September 2010, the Heat Pump Programme details the benefits of using compact heat exchangers (CHEs): . Improved heat exchanger thermal effectiveness: thermal...

• Publication date : 2011/02/07

IIR Rankine Conference 2020: Which alternative working fluids for ORC systems?

HFOs (hydrofluoroolefins), HCFOs (hydrochlorofluoroolefins) and hydrocarbons were the main alternatives to HFC245fa presented during the IIR Rankine Conference 2020.

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

Reducing the economic costs of a direct-use geothermal heating system

Italian researchers have modelled a polymer heat exchanger to reduce the cost of a direct-use geothermal heating system for a single building in the active volcano district of the...

• Publication date : 2022/02/21
• Subjects: Technology

A study assesses alternative mixtures to two pure hydrocarbon refrigerants

An article reviews more than 11,000 mixtures of refrigerants that could be interesting alternatives to pure R290 and R600a.

• Publication date : 2020/02/05

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

Oil-free chillers

At the beginning of 2005, Climavenata will launch its new range of liquid chillers: the "Turbo Efficiency Climaveneta System" (Tecs), which is an oil-free chiller. The range is fitted with Danfoss-Turbocor R-134a centrifugal compressors :...

• Publication date : 2005/02/10

ICR 2019: an overview of current refrigeration research (part I)

Presentation of the main scientific and technical topics covered in the papers of the 25th IIR International Congress of Refrigeration and summary of some of the 14 keynotes.

• Publication date : 2019/09/30
• Subjects: HFCs alternatives

Energy efficiency comparison of air-conditioning systems in electric vehicles

A study compares the energy efficiency of conventional refrigeration systems with that of heat pumps in mobile air conditioning. R744, R134a and R1234yf are considered. Reversible heat pumps are found the most energy-efficient systems.

• Publication date : 2019/02/28

The French air-conditioning market is growing significantly

According to Clim'info, in France, sales of individual air conditioners (with capacities below 17.5 kW) have undergone a very strong progression - about 40% - in 2003 compared with 2002. Sales of small mobile units, in particular, have benefited...

• Publication date : 2004/07/15

Magnetic cooling takes off

- The principle of magnetic cooling is based on the magnetocaloric effect, which was discovered in 1881 by Warburg. Magnetocaloric materials heat up when they are positioned in a magnetic field and cool down to a lower temperature than their...

• Publication date : 2005/02/11

China: new CO2 heat pump standard

Standard GB/T26181-2010 is for hermetic motor-compressors for household and similar-use heat pump water heaters using CO2 refrigerant, and is expected to accelerate the introduction of new products on the Chinese market.

• Publication date : 2011/12/22

IJR highlights: review of low-GWP alternative refrigerants

In a recent review article based on over 60 published studies and published in the International Journal of Refrigeration, Chinese researchers have compared nearly 40 alternative low-GWP refrigerants in terms of...

• Publication date : 2021/06/28
• Subjects: HFCs alternatives

Record: heat pump less than 10 g of propane per kW

German researchers have developed a refrigeration circuit integrating a propane heat pump that achieves a heating power of 12.8 kW with only 124 g of refrigerant. 

• Publication date : 2022/10/27

Heat pump efficiency at low temperatures

A study based on field data shows that heat pumps had significantly higher energy efficiency than oil or gas heating systems, particularly for outdoor temperatures above -10°C. 

• Publication date : 2023/09/22

New publications

The IIR has issued 3 new publications: - the 20th Informatory Note on Refrigerating Technologies Magnetic Refrigeration at Room Temperature, written by P. Egolf - Chairman of the IIR working party dedicated to this technology - and Ronald...

• Publication date : 2007/11/20

Briefs: CERTE Sub-Commission meeting

The annual meeting of Sub-Commission (SC) D2 on Refrigerated Transport (CERTE), which took place in Prague, Czech Republic, was the occasion to discuss numerous technical questions on tests. It was decided to enlarge the scope of the SC and...

• Publication date : 2008/08/12

Heat pumps, the central theme of the recent IIR Congress

An overview of the research carried out in the field of heat pumps, with the aim of achieving greater flexibility and increased energy efficiency, in particular through to the use of thermal energy...

• Publication date : 2023/10/24

Technical visit to the Tokyo fish market (in French)

During the ICCC conference last June, participants were offered technical visits, including a tour of the Tokyo Fish Market. Alain Le Bail, President of the IIR Commission C2, chose to visit it. Discover his...

• Publication date : 2024/11/15

Nanorefrigerants

Nanorefrigerants are created by adding nanoparticles in suspension to a base refrigerant. They have a thermal conductivity that is 15% to 104% higher than that of the corresponding...

• Last update : 2022/06/17
• Langues : English, French
• Themes : Nanofluids

Cryogenic nitrogen in the food and beverage industry

The adoption of cryogenic processes in the food and beverage industry is predominantly driven by liquid nitrogen (LIN), and it is the preferred candidate for food chilling and...

• Last update : 2023/11/07
• Langues : French, English
• Themes : Freezing of foodstuffs

Additive manufacturing of heat exchangers

In the refrigeration industry, additive manufacturing (colloquially referred to as “3D printing”) makes it possible to fabricate novel, complex and potentially more energy efficient...

• Last update : 2022/09/07
• Langues : French, English
• Themes : Evaporators, condensers and other heat exchangers

Hydrocarbon refrigerants

Hydrocarbons such as R290 (propane), R600a (isobutane) or R1270 (propene/propylene) are low GWP non-toxic natural refrigerants with excellent thermodynamic properties. They offer an...

• Last update : 2022/06/22
• Langues : French, English
• Themes : Hydrocarbons, Containment, refrigerant charge reduction