17th EUROPEAN CONFERENCE, TECHNOLOGICAL INNOVATIONS IN REFRIGERATION AND IN AIR CONDITIONING POLITECNICO OF MILAN 9th-10th June 2017 Refrigeration Plants as beneficial Energy Conversion Facilitators Funder-Kristensen T.1 ; Leinweber D.2 1 Ph.D. Head of Public & Industry Affairs, Danfoss, Nordborg, 6430, Denmark. 2 Dipl.-Kfm /M.i.M. Business Dev. Energy Storage, Danfoss, Nordborg, 6430, Denmark. ABSTRACT Compared to previous studies the opportunities for using the refrigeration system as a total energy facilitator have increased with emerging thermal and electrical storage opportunities. In this paper, several opportunities for integration of refrigeration systems with internal as well as external energy grids are investigated. A hierarchy of technologies which surrounds the refrigeration plants is described with the aim of reducing the cost for the owner and at the same time reducing CO2 emissions from the conventional thermal and electrical energy production. It is outlined how a cost reduction of more than 40% can be achieved. More specifically it is outlined how PV electricity production and storage can add extra value in combination with the refrigeration system and how the opportunities for utilizing the temporary unused cooling and capacity of the systems can yield a good payback. KEYWORDS Smart systems, Energy storage, Refrigeration, District heating, Supermarket, Food Retail INTRODUCTION Cooling applications covering refrigeration, air conditioning, and heat pumps are responsible for 15-20 % of the electricity consumption globally and likely going to increase in the future with the increasing electrification. The fundamental energy management of these systems are mostly based on the old energy paradigms and not exploiting the opportunities for improving the overall performance. The primary improvement potentials are found in the composition and performance of system components and are typically regulated by Minimum Efficiency Performance Standards (MEPS) like in the Eco-design directive. The validity of MEPS methodology has been proven over the decades; however, it also implies its limitations based on strict testing measures and system (commodity) definitions. When systems are in operation they correspond to variable conditions where sizing, modus of operation dramatically can change the actual versus expected efficiency. Furthermore, the dawn of variable energy cost - and remuneration - has pushed the perception of traditional efficiency. Is the COP of a system more important than the availability of cheap wind or PV energy? Or does it make a good business case to store energy? The consumer would argue that the best measure is the accumulated cost of energy seen over a period. The cost of energy at the end summarizes the needs of the players in the energy system – and the means for obtaining the lowest energy cost be planned to accomplish the best business case or pay back.
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