TABLE OF CONTENTS

Chillers and heat pumps based on hydrocarbon refrigerants installed at Aarhus
University Hospital Skejby
introduction
Following the ban on the installation of new R22 systems and the ban on using virgin
R22 from year 2000 in Denmark the government has introduced a maximum charge
when it comes to HFC of 10 kg. Multiplexing systems using 10 kg or less are not
allowed unless they can be proven to be more efficient than alternatives. Furthermore
the government has introduced a taxation on HFC refrigerants based on the global
warming potential (GWP) values for the individual refrigerants. The tax is collected at
the importers point of sale.
about the system
About the company
Since its start in 1885, Johnson Controls has grown
into a global leader in building efficiency, automotive
experience, and power solutions. JCI is one of the
leading companies of refrigeration and chiller solutions
based on natural refrigerants. It offers products and
services that optimize energy use and improve comfort
and security.
More information at:
www.johnsoncontrols.com
Contact Information
Alexander Cohr Pachai
Alexander.C.Pachai@jci.com
(+45) 8736 7159
In light of this ban and tax Aarhus University Hospital Skejby had to make a decision
regarding their future chiller systems for cooling different locations aroud the hospital
and also regarding the condensers of refrigeration systems in different hospital sectors
and research labs.
R600a R600a R744 R744
40˚C/70˚C 40˚C/80˚C 40˚C/70˚C 40˚C/80˚C
COP heat 3,7 3,3 2,9 2,9
Assumptions Te=5˚C Te=5˚C Te=5˚C Te=5˚C
Tc=68˚C Tc=78˚C Pc=110bar Pc=110bar
Sc=25K
Sc=25K
NH 3
(ammonia) was not considered as an option for the heat pumps as the technology
was not developed at this point in time and will not be competitive in this size of
application.
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