Cool and frozen storage in wholesale
(Opbevaring på køl og frys i engros)
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Denmark
2002
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Many products
need to be stored cold or frozen before delivery to retailers.
Process description
The present data
refer to
1) cold
storage (5oC in a 52 m3 cooling
room) and 2) frozen storage (-20oC
in a 52 m3
freezer).
The cooling technology is modern (2002) but otherwise unknown.
Data collection and treatment
Data on cool and frozen storage are acquired
through telephone interview with
Nordic.
The energy consumption,
Ep for cool and frozen storage of a given product can be roughly
estimated by following formula:
Ep
= Es × 100%/u × Vp × t
Where
Es is the specific energy consumption of the
cooling or
freezing room (kWh per m3 per day). See below.
u is the degree of utilisation of the
storage room (%). 50% considered is a reasonable estimate.
Vp is the volume of the considered product
(m3).
t is the time of the storage (days).
Technical
scope
The present data include electricity consumption for keeping products
cool or frozen when applied in Denmark (average of the year). The freezing
or cooling of the products is not included. Other processes in wholesale are not taken into account.
Eventual utilization of heat from cooling aggregates has not been considered.
Representativity
The present data are acquired from one supplier of cooling systems and
the representativity is unknown. Supposedly, the data provides a reasonable
order of magnitude for modern cooling systems applied in Denmark today.
Validation
Electricity
consumption for cool and frozen storage per unit of stored product
is determined by five main
factors: the storage temperature and room temperature, the daily
praxis of the user, the
applied cooling technology,
the condition of the equipment and the degree of utilisation
of the cooling capacity, and electricity consumption
can vary a lot depending on the actual conditions. The present
the data are same order of magnitude as previously reported from a Swedish
study, see review by Carlsson-Kanyama (2000).
Inputs and outputs
Electricity
consumption associated with cool and frozen storage.
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Specific electricity consumption, Es
kWh per m3 per day
1)
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Cool
storage (5oC)
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0.59
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Frozen storage
(-20oC)
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0.63
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1)
For determination of potential
environmental impacts associated with
food products
ex retail, it
has been assumed that fresh fish and milk occupy
space at 5oC for one
day, that fresh butter,
meat and cheese occupy space at
5oC
for three days while frozen products occupy space
at -20oC
in three days. |
References
Carlsson-Kanyama
(2000): Energy use in the food sector - A data survey. Swedish Environmental
Protection Agency. Naturvårdsverket. AFR-report 291.
Administrative
information
Data URL: http://www.lcafood.dk/processes/trade/wholsalecoolstorage.html
Version no.:
1.00
Authors: Per
H. Nielsen 2.-0 LCA
Consultants.
Data entry:
Data have been entered in this format by Per H. Nielsen.
Data completed: July
2003.
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