L.a. Tagliafico

Publications (42) View all

• Source

  Available from: Federico Scarpa

  Article: A compact dynamic model for household vapor compression refrigerated systems

  L. TAGLIAFICO, SCARPA F, TAGLIAFICO G
  [show abstract] [hide abstract]
  ABSTRACT: In this study, a very simplified dynamic lumped model for the simulation of small-scale single-temperature vapor compression refrigerators working between two thermal sources with finite thermal capacity is presented. The model is compact enough to be employed in actual regulation systems, but adequate to describe the basic underlying physical phenomena relevant to the transient response of the refrigerated cell. The dynamic behavior of the system is simulated taking into account the main heat capacities involved in the heat transfer processes between the system, the refrigerating fluid and the outside. The numerical model has been validated by comparing the calculated results with transient experimental data coming from an instrumented chest-freezer. After a steady state tuning phase, the model was able to predict the transient temperature response of the cell with good accuracy.
  Applied Thermal Engineering 03/2012; 35(march 2012-35):1-8. · 2.06 Impact Factor
• Source

  Available from: Federico Scarpa

  Article: Integrated solar-assisted heat pumps for water heating coupled to gas burners; control criteria for dynamic operation

  F. Scarpa, L.A. Tagliafico, G. Tagliafico
  [show abstract] [hide abstract]
  ABSTRACT: A direct expansion integrated solar-assisted heat pump (ISAHP) is compared to a traditional flat plate solar panel for low temperature (45 °C) water heating applications. The (simulated) comparison is accomplished assuming both the devices are energy supplemented with an auxiliary standard gas burner, to provide the typical heat duty of a four-member family. Literature dynamical models of the systems involved have been used to calculate the main performance figures in a context of actual climatic conditions and typical stochastic user demand.
  Applied Thermal Engineering 01/2011; 31(1):59-68. · 2.06 Impact Factor
• Source

  Available from: Federico Scarpa

  Article: Ageing effect on the magnetocaloric properties of Gd, Gd5Si1.9Ge2.1 and on the eutectic composition Gd75Cd25

  F Canepa, S Cirafici, M Napoletano, M R Cimberle, L Tagliafico, F Scarpa
  [show abstract] [hide abstract]
  ABSTRACT: The ageing effects due to the interaction with typical working fluids (water and air) of magnetic refrigerant materials have been analysed for up to one year. Among the many compounds reported to exhibit a sufficiently high magnetocaloric effect, we decided to artificially age Gd, which represents the first choice high magnetocaloric element, Gd5Si1.9Ge2.1, belonging to the series Gd5(SixGe4−x)4 which for x ~ 0.5 displays a giant magnetocaloric effect, and finally, the eutectic Gd75Cd25 alloy, presenting an almost constant adiabatic temperature rise in an interesting temperature span (260–280 K). Magnetothermal results give evidence that corrosion and corrosion/erosion processes take place with different results on the refrigerant properties of all the materials. The adiabatic temperature rise is strongly reduced due to surface oxidation which lowers thermal conduction while the effect on the refrigerant capacity Q is definitely smaller. The effects of corrosion/erosion processes are confirmed by quantitative chemical analysis performed on the refrigerant fluid before and after the ageing process. Employing working fluids with a reduced corrosive effect but with comparable thermal properties may be a viable way of avoiding corrosion damage; alternatively the use of additives to decrease the corrosive properties of the fluids is strongly suggested.
  Journal of Physics D Applied Physics 07/2008; 41(15-41):1-10. · 2.54 Impact Factor
• Article: Ageing effect on the magnetocaloric properties of Gd, Gd 5Si 1.9Ge 2.1 and on the eutectic composition Gd 75Cd 25

  F Canepa, S Cirafici, M Napoletano, M R Cimberle, L Tagliafico, F Scarpa
  Journal of Physics D: Applied Physics. 01/2008; 41(15).
• Source

  Available from: Federico Scarpa

  Article: Performance analysis of a room temperature rotary magnetic refrigerator for two different gadolinium compounds

  L.A. Tagliafico, F. Scarpa, F. Canepa, S. Cirafici
  [show abstract] [hide abstract]
  ABSTRACT: A thermodynamic performance analysis is developed for a Steyert-like rotary magnetic refrigeration (RMR) system operating in the near-room temperature range with two possible, alternative, gadolinium compounds. The first magnetocaloric material (MCM) is an alloy (Gd7Pd3) with a well defined Curie temperature (around 318 K), while the second MCM (Gd76Pd24) is an eutectic compound with a smoothed double Curie transition (at 298 and 318 K, respectively).
  International Journal of Refrigeration 12/2006; 29(8):1307-1317. · 1.82 Impact Factor