Navigation Links
Aldi Süd supermarkets -- energy-optimized
Date:2/6/2013

Cold air flows out of the long rows of shelves filled with sausages, dairy products and fish. Numerous lamps light up the space where daylight barely penetrates. Supermarkets use nearly ten times the energy of a normal household. Researchers at the Fraunhofer Institute for Solar Energy Systems ISE in Freiburg, Germany have now created alternatives. "We have developed an integrated concept in collaboration with property developers, the planning team and manufacturers and as a result, we aim to reduce energy consumption by 25% in comparison to regular supermarkets", says Nicolas Rhault, Group Leader at ISE.

The main focus of the concept lies in the area of cooling. This is because at approximately 40 to 50%, it represents the largest share of the electricity bill. The freezer-systems have to reliably store pizza, cake, fish, etc. at -25 Celsius, otherwise the goods will spoil. Sausages and cheese must be stored at a maximum of four degrees Celsius. Normally, plug-in freezers are used for this purpose. They generate the required level of refrigeration themselves and pump the produced heat directly into the store a practical but inefficient method. ISE researchers have now developed a combined central refrigeration system in collaboration with property developers and the planning team. Now, all cooling points are connected to a combined central refrigeration system. The heat is not dissipated into the store but channeled via a three-stage recooling system. During the winter the system recovers the heat via a heat exchanger and uses it to heat the store. Residual heat is channeled via a gas chiller and geothermal heat pump in the surrounding area. In doing so heated water is pumped through probes into the ground where the heat is dissipated and the water is fed back cold. The result of this is that freezers and chiller cabinets only require half the electricity of comparable standalone units. Gas and oil-fired boilers are superfluous as heating is provided by the waste heat from the cooling systems. The heating system also has an effect on the ventilation system. The system is no longer required for heating; rather, it is used exclusively for introducing fresh air into the store, and is therefore a third smaller in size.

Carbon dioxide as coolant

The scientists have also optimized the choice of refrigerant, the agent which serves to absorb heat and transport it to the chilled areas. However between 5 and 15% of the refrigerant leaks out of any system annually. Conventional refrigerants have a high global warming potential, in other words, they contribute to heating the atmosphere. For this reason, the scientists utilized carbon dioxide, which has a global warming potential 3000 to 4000 times less than conventional refrigerants. Up until now, carbon dioxide has rarely been used as a refrigerant as the system must withstand high pressures. Moreover, the efficiency of the system is reduced during hot summer days. In order to compensate for losses at high ambient air temperatures, the experts integrated a third cooling stage in collaboration with their colleagues from Hafner-Muschler. When the sun beats down from the sky, the refrigerant is sub-cooled via a geothermal heat exchanger.

Lighting makes up the second largest share of the electricity bill. For this reason the scientists employ daylight to illuminate large stores. Light enters the store via triple-glazed skylights. A microscreen is fitted between the individual panes of glass to reflect direct sunlight which allows only indirect light to pass through. Artificial light in the form of lamps is additionally switched on and controlled in relation to the available daylight.

"Part of our concept has already been implemented by Aldi Sd in their new buildings. This enabled 20% energy savings to be achieved during the first year of operation", explains Rhault. "New control strategies have now enabled us to optimize these concept components so that energy savings of 25% will be saved in the second year of operation, compared to a standard branch. This is already very close to our goal of 30%."


'/>"/>

Contact: Nicolas Rhault
nicolas.rehault@ise.fraunhofer.de
49-761-458-85352
Fraunhofer-Gesellschaft
Source:Eurekalert  

Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Aldi Süd supermarkets -- energy-optimized
(Date:5/16/2016)... 2016   EyeLock LLC , a market leader ... of an IoT Center of Excellence in ... development of embedded iris biometric applications. EyeLock,s ... and security with unmatched biometric accuracy, making it the ... DNA. EyeLock,s platform uses video technology to deliver a ...
(Date:4/28/2016)... , April 28, 2016 First quarter 2016: ... up 966% compared with the first quarter of 2015 ... SEK 589.1 M (loss: 18.8) and the operating margin was 40% ... 0.32) Cash flow from operations was SEK 249.9 M ... revenue guidance is unchanged, SEK 7,000-8,500 M. The operating ...
(Date:4/15/2016)... 15, 2016 Research and ... Biometrics Market 2016-2020,"  report to their offering.  , ... , ,The global gait biometrics market is expected ... the period 2016-2020. Gait analysis generates ... be used to compute factors that are not ...
Breaking Biology News(10 mins):
(Date:6/27/2016)... 2016  Global demand for enzymes is forecast ... to $7.2 billion.  This market includes enzymes used ... biofuel production, animal feed, and other markets) and ... Food and beverages will remain the largest market ... of products containing enzymes in developing regions.  These ...
(Date:6/27/2016)... Raleigh, NC (PRWEB) , ... June 27, 2016 ... ... a mission to bring innovative medical technologies, services and solutions to the healthcare ... development and implementation of various distribution, manufacturing, sales and marketing strategies that are ...
(Date:6/24/2016)... Epic Sciences unveiled a liquid biopsy ... PARP inhibitors by targeting homologous recombination deficiency (HRD) ... test has already been incorporated into numerous clinical ... Over 230 clinical trials are investigating ... PARP, ATM, ATR, DNA-PK and WEE-1. Drugs targeting ...
(Date:6/23/2016)... 2016   Boston Biomedical , an industry ... to target cancer stemness pathways, announced that its ... Drug Designation from the U.S. Food and Drug ... including gastroesophageal junction (GEJ) cancer. Napabucasin is an ... cancer stemness pathways by targeting STAT3, and is ...
Breaking Biology Technology: