Energy savings potential using the thermal inertia of a low temperature storage

24ième Congrès International du Froid ICR 2015, Yokohama, JPN, 16-/08/2015 - 22/08/2015International audience50% of the energy consumed in food cold chain are for chilling, freezing and storage steps. For cold storage facilities, refrigeration is the main source of energy consumption with an average of 50 kWh/m3/year. A possible strategy to reduce their energy consumption is to take advantage of the variation of performance of the refrigeration systems during a day due to external and internal temperature variations. Electricity cost can also widely change during a day, depending on the local production. This strategy can be based on additional storage capacities to delay the refrigeration running period, but also on the use of the thermal inertia provided by the storage warehouse itself and the products stored. An experimental test has been performed in a frozen warehouse storage facility to evaluate the potential energy savings of such a strategy. Using coupled models of the building, products and refrigeration system, using weather forecasts and products flux statistics, a predictive control algorithm was developed and applied to determine periodically the optimal set-points of the storage warehouse. Technical implementation of the control system is presented. Energy savings potential and impact on products of the temperature fluctuations are also discussed

España y los eurocódigos: la necesidad de converger

España, al igual que el resto de Europa, se encuentra ante un gran reto con la implantación progresiva de la versión definitiva de los Eurocódigos. Paradójicamente, la historicamente euroentusiasta España se encuentra hoy por hoy a la cola de los paises europeos en lo referente a su entusiasmo por los Eurocódigos. Mientras en muchos de los paises de nuestro entorno se abandonarán completamente las normas nacionales, a pesar del euroescepticismo de algunos (vease Reino Unido), España seguirá produciéndolas. Además de las razones políticas y estratégicas claras para que España apueste decididamente por la implantación de los Eurocódigos, en este trabajo se presentan razones técnicas basadas en un estudio comparativo del diseño resultante de varias estructuras, de diversa tipología, diseñadas con la IAP/EHE/RPX y con los Eurocódigos

Pre-industrialization activities related to CMS coil winding

The CMS coil is a large 4 layer superconducting solenoid involving the use of a new design reinforced conductor. In order to understand the feasibility of the coil manufacture using the inner winding technique for this particular conductor, the CMS Collaboration has developed a pre-industrialization activity. The main objectives were: (1) study of the methods for winding a coil using a stiff conductor; (2) design, construction and testing of a prototype winding line; and (3) construction of a model for the fine tuning of the required operation and procedures. The activities, carried out in cooperation with industry, were successfully completed, giving basic information for the necessary tool and methods to be used for the coil winding. (5 refs)