Search results

Impact of high-efficiency and variable-speed motors on the performance of a residential split-system air conditioning system.

• Author(s) : BREHM J. K., RADITSCH F. R., HEPPERLA R., ZIVIANI D., GROLL E. A.
• Publication date: 2022
• Languages : English
• Keywords : Air conditioning, Split system, Variable speed, Domestic heat pump, Seasonal performance, COP, Compressor unit, Testing, Expérimentation
• Source: 2022 Purdue Conferences. 19^th International Refrigeration and Air-Conditioning Conference at Purdue.
• Formats : PDF

Comparing constant-speed and variable-speed centrifugal chillers.

• Author(s) : SULLIVAN B.
• Publication date: 2014/12
• Languages : English
• Keywords : Comparison, Variable speed, Chiller, Performance, Centrifugal compressor
• Source: ASHRAE Journal - vol. 56 - n. 12

IIR document

Performance comparisons for variable-speed ductless and single-speed ducted residential heat pumps.

• Author(s) : CHEUNG H., BRAUN J. E.
• Publication date: 2014/11
• Languages : English
• Keywords : Comparison, Variable speed, Heat pump, Performance, Duct
• Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 47
• Formats : PDF

Commercial refrigeration application of variable speed compressor and variable speed fans for improved off-design efficiency.

• Author(s) : ORLANDI M., VISCONTI F. M., RUGGERI A.
• Publication date: 2015/06/12
• Languages : English
• Keywords : Refrigerating system, Energy consumption, Commercial application, Variable speed, Fan, Energy saving, Compressor
• Source: Le ultime tecnologie del freddo e del condizionamento. Atti del 16° Convegno Europeo: June 12-13, 2015, Milano, Italia.
• Formats : PDF

IIR document

Development of a virtual variable-speed compressor power sensor for variable refrigerant flow air conditioning system.

• Author(s) : GUO Y., LI G., CHEN H., et al.
• Publication date: 2017/02
• Languages : English
• Keywords : Variable volume, Sensor, Variable speed, Model, Refrigerant, Air conditioning, Compressor
• Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 74
• Formats : PDF

Performance analysis of a variable speed drive.

• Author(s) : OSSORIO R., NAVARRO E., LÓPEZ A., ROMAN J. A. M.
• Publication date: 2020/11/11
• Languages : English
• Keywords : Compressor, Variable speed, Air conditioning, Energy consumption, Power, Performance, Inverter
• Source: X Congreso Ibérico y VIII Congreso Iberoamericano de Ciencias y Técnicas del Frío, CYTEF 2020.
• Formats : PDF

Scroll wrap additional stress in variable speed application.

• Author(s) : GROSS D., GENEVOIS D.
• Publication date: 2018/07/09
• Languages : English
• Keywords : Software, Seal, Variable speed, Rotation, Scroll, Simulation, Compression, Scroll compressor
• Source: 2018 Purdue Conferences. 24^th International Compressor Engineering Conference at Purdue.
• Formats : PDF

Simulation analysis on variable speed air conditioner under extreme conditions.

• Author(s) : ZHANG L., LIU C.
• Publication date: 2022
• Languages : English
• Keywords : Expansion valve, Variable speed, Simulation, Air conditioner, Compressor
• Source: 2022 Purdue Conferences. 19^th International Refrigeration and Air-Conditioning Conference at Purdue.
• Formats : PDF

Applicazione di refrigerazione commerciale con compressori a velocità variabile per maggiore efficienza.

Application of variable speed compressors in commercial refrigeration for better performance.

• Author(s) : ORLANDI M., VISCONTI F. M., RUGGERI A.
• Publication date: 2016/08
• Languages : Italian
• Keywords : Commercial application, Variable speed, Performance, Optimization, Compressor
• Source: Industria & Formazione - vol. 40 - n.402
• Formats : PDF

Acoustic improvements for a new generation of variable speed compressors.

• Author(s) : VENDRAMI C. E., PELLEGRINI C., HATTORI M., et al.
• Publication date: 2014/07/14
• Languages : English
• Keywords : Noise, Comparison, Variable speed, Design, Performance, Optimization, Acoustics, Compressor
• Source: 2014 Purdue Conferences. 22nd International Compressor Engineering Conference at Purdue.
• Formats : PDF

IIR document

Semi-empirical modelling of a variable speed scroll compressor with vapour injection.

• Author(s) : DARDENNE L., FRACCARI E., MAGGIONI A., et al.
• Publication date: 2015/06
• Languages : English
• Keywords : Variable speed, Vapour, Modelling, Injection, Scroll compressor
• Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 54
• Formats : PDF

Energy performance comparison of fans with variable speed drives.

• Author(s) : HAUER A.
• Publication date: 2016/11/09
• Languages : English
• Keywords : Energy consumption, Comparison, Variable speed, Fan, Control (automatic), Energy efficiency
• Source: ASHRAE Journal - vol. 58 - n. 11

Increasing the stable operating range of a fixed-geometry variable-speed centrifugal compressor.

• Author(s) : BRASZ J. J.
• Publication date: 2014/07/14
• Languages : English
• Keywords : Technology, Variable speed, Efficiency, Performance, Centrifugal compressor
• Source: 2014 Purdue Conferences. 22nd International Compressor Engineering Conference at Purdue.
• Formats : PDF

Influencing factors study of the variable speed scroll compressor with EVI technology.

• Author(s) : KANG X., HU Y., SHAN C., et al.
• Publication date: 2016/07/11
• Languages : English
• Keywords : Variable speed, Vapour, Prototype, Injection, Testing, Scroll compressor
• Source: 2016 Purdue Conferences. 23^rd International Compressor Engineering Conference at Purdue.
• Formats : PDF

Virtual sensor of insufficient lubrication in variable speed compressors.

• Author(s) : OSSORIO R., NAVARRO-PERIS E., LÓPEZ-NAVARRO A.
• Publication date: 2022/04
• Languages : English
• Keywords : Compressor, Variable speed, Lubricant, Polyolester, Propane, R290, Sensor, Lubrication, Expérimentation, Oil
• Source: XI Congreso Ibérico y IX Congreso Iberoamericano de Ciencias y Técnicas del Frío, CYTEF 2022.
• Formats : PDF

Australia: cutting edge compressor technology drives results

The installation of computer-controlled variable speed drives on refrigerating plant compressors at a warehouse in Sydney, Australia, has enabled Swire Cold Storage to reduce its energy consumption by over 15% during the cooler months.

• Publication date : 2012/10/26

Virtual sensor for variable refrigerant flow AC system.

A summary referring to an article recently published in the International Journal of Refrigeration (IJR).

• Publication date : 2017/03/20

Brazilian government outlines measures to reduce electricity consumption

Owing to severe droughts affecting hydropower generation, the Brazilian government is imposing measures to reduce electricity consumption in public buildings, including limiting the...

• Publication date : 2021/09/27
• Subjects: Regulation, Developing country

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

Briefs: Japanese programme for next generation heat pumps

The Ministry of Economy, Trade and Industry (METI) in Japan has set up the Next Generation Heat Pump Research Council within the New Energy and Industrial Technology Development Organisation (NEDO) in order to examine concrete research proposals....

• Publication date : 2010/03/07

Compressors: key trends

Over the past few years, the design and performance of rotary, reciprocating positive displacement and dynamic compressors have been greatly improved. CO2 compressors have conquered new niches and twin-screw compressors are now increasingly used...

• Publication date : 2005/10/26

Trends and Figures: Chiller market grows and diversifies

According to reports published during the 2008 AHR Expo held on January 22-24, 2008 in New York, the chiller market in 2006 was USD 2 billion in Asia-Pacific, USD 1.5 billion in Europe and USD 1 billion in the US. The growth (as compared to 2005)...

• Publication date : 2008/05/13

Eight ways to save energy in cold stores

Researchers from Enviros Consulting analysed cold storage at 13 frozen food manufacturers and cold store operators in UK for the report "Improving the energy efficiency of the cold chain" released by the British Frozen Food Federation (BFFF)....

• Publication date : 2009/08/13

Chillers: efficiency takes off

Chillers are key refrigerating systems since, according to the Department of Energy, in the US, they account for about 13% of the power consumed by the nation's buildings and 9% of the overall demand for electric power. Examples below illustrate...

• Publication date : 2008/10/25

The Bank of England overhauls chillers

A new cooling system at the Bank of England building, in the City of London, has saved an estimated 48% on cooling energy, which translates to €190,000 a year.

• Publication date : 2016/05/24

50% of data center cooling systems soon upgraded in North America

According to Emerson Network Power, half of all data center cooling systems in North America will be upgraded before the end of 2016 in a drive for greater reliability, efficiency and additional capacity.

• Publication date : 2016/02/15

China to enforce a more stringent energy efficiency standard for air conditioners

A new standard, which will come into effect on July 1, 2020, increases the minimum energy efficiency values of room air conditioners, resulting in the elimination of the least efficient air conditioners, i.e....

• Publication date : 2020/04/05
• Subjects: Regulation

CO2 heat pump with variable-displacement compressor/expander in the pipeline

This CO2 heat pump will use oil-free variable-load compressor and variable expander technology, currently tested at Purdue University’s Herrick Laboratories.

• Publication date : 2014/01/09

Noise reduction strategies for screw compressors

The operating noise of twin-screw compressors is an important issue that may limit their scope of application. Two recent IJR papers suggest several noise reduction methods and analyse their...

• Publication date : 2021/05/31

Market assessment and updates of Rwanda’s national cooling strategy

In Rwanda, the purchase of household refrigerators and ACs is increasing with economic growth. As part of the national cooling strategy, the country has launched a public awareness campaign on efficient cooling...

• Publication date : 2021/03/29
• Subjects: Environment, Developing country

News from IIR members: Danfoss

Danfoss won the 2009 AHR Exposition Refrigeration Innovation Award. The honoured product is a newly developed energy-saving variable frequency drive for compressors, pumps, and fans. In refrigeration applications, the AKD 102 constantly matches...

• Publication date : 2009/05/18

News from IIR members: Masterflux from Tecumseh

Tecumseh has unveiled a new line of direct-current (DC) Masterflux compressors in India. The compressor manufacturer has designed the compressors for battery cooling applications for the growing telecommunications market and also for beverage...

• Publication date : 2012/03/05

First meeting of the IIR Working Group on Dehumidification in Air Conditioning

The IIR Commission E1 Working Group (WG) on “Dehumidification in Air Conditioning”, chaired by Baolong Wang and Xu Zhang, held its first meeting during the IIR-co-sponsored Purdue conferences on July 9, 2018.

• Publication date : 2018/09/20

News from IIR members: Star Refrigeration

Star Refrigeration has installed a highly efficient Azanechiller at a Scottish meat processing facility. The central pumped glycol system has a total cooling capacity of 365kW and includes pumps with variable speed drives, six ceiling...

• Publication date : 2011/08/04

Highlights: 10th IIR Conference on Compressors and Refrigerants

Catch up on the best moments of the IIR Conference on Compressors 2021, which took place online on January 13, 2021: A key meeting place for specialists in compressor technology!

• Publication date : 2021/01/25
• Subjects: Technology

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 : English, French
• Themes : Evaporators, condensers and other heat exchangers

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