UPDATE: How efficient is your CO2 system?

By R744.com team, Mar 15, 2010, 12:11 2 minute reading

The Danish institute IPU has developed a software that allows the calculation of refrigeration plants' annual energy consumption, analysis of different features as well as comparison between CO2 systems and traditional systems. The new version 2.25 of the software Pack Calculation II is now online.

The software Pack Calculation II is a simulation tool developed to an advanced stage for calculating the energy use of refrigeration systems with CO2 as the refrigerant. It offers comparison of different refrigeration systems based on the refrigeration cycle and compressor used as well as their geographical location. So far, the application contained models of 11 commonly used refrigeration cycles and more than 2000 commercially available compressors as a basis for calculating the most effective combination of components. The 2.25 version of the pack calculation software now also covers CO2 compressor models by R744.com partners Bock, Bitzer and Dorin, the description of which can be found on the R744.com product section.

The software that can be downloaded for free from the IPU website in Danish and English, is part of a joint project with leading Danish component and system suppliers for the “Development and use of simulation tools for energy optimisation of refrigeration systems with CO2 as the refrigerant”. A preliminary version was presented last May at a special CO2 technical seminar in Denmark. Its development in Denmark – a forerunner in the deployment of R744 supermarket refrigeration systems – was necessary as systems seldom run in dimensioned conditions but most of the time at a part load and at differing ambient conditions. The IPU simulation programme helps to estimate the energy consumption of a system over a year’s course and compare two alternatives, as well as different compressor and fan options available. The tool takes account of the specifics of CO2 systems, including the higher efficiency of R744 compressors and the lower condensing temperature than for traditional systems. The calculation programme showed that transcritical CO2 systems would be more energy-efficient than competing units in northern countries.

Private-public collaboration

IPU developed the application in collaboration with R744.com partners Advansor, Danfoss, Grundfos, Johnson Controls, and the Dansk Teknologisk Instituts, as well as the Dansk Kølebranchens Kvalitetssikringsordning as part of a project financed under the ELFORSK programme by Dansk Energi. Part of the project is also the “Simple one-stage CO2” tool primarily for teaching purposes that lets the user gain first or additional experience with transcritical CO2 cycles.

About IPU

IPU Refrigeration and Energy Technology offers professional assistance based on a strong foundation in applied thermodynamics, simulation and refrigeration technology. 
The close links to the nation’s leading technical/scientific university (DTU) provide IPU with a wider range of opportunities for development. The institute has vast experience in formulating and managing publicly financed projects (usually financed by the Danish Energy Authority) and services for and in collaboration with the industry.


By R744.com team (@r744)

Mar 15, 2010, 12:11

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