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| Title: | THERMAL ANALYSIS OF CALORIMETRIC SYSTEMS | |
| DOI No: | 10.1142/9789812772985_0015 | |
| Source: | CONDENSED MATTER NUCLEAR SCIENCE (pp 145-155) | |
| Author(s): | L. D'AULERIO
ENEA Frascati Research Center, V.Le E. Fermi 45, 00044 Frascati (RM), Italy V. VIOLANTE ENEA Frascati Research Center, V.Le E. Fermi 45, 00044 Frascati (RM), Italy E. CASTAGNA ENEA Frascati Research Center, V.Le E. Fermi 45, 00044 Frascati (RM), Italy R. FIORE ENEA Frascati Research Center, V.Le E. Fermi 45, 00044 Frascati (RM), Italy L. CAPOBIANCO ENEA Frascati Research Center, V.Le E. Fermi 45, 00044 Frascati (RM), Italy PR. DEL PRETE La Sapienza University, Via Eudossiana 18, I-00184 Roma, Italy F. TANZELLA SRI International, 333 Ravenswood Ave., Menlo Park, CA 94025, USA M. MCKUBRE SRI International, 333 Ravenswood Ave., Menlo Park, CA 94025, USA |
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| Abstract: | Calorimetric analysis has been carried out for both electrochemical and gas loading experiment. A finite element modeling for steady state and transient gave a satisfactory agreement with the experimental results. For electrochemical cells modeling was applied for isoperibolic and flow calorimeters with the main goal to optimize the system. For high-temperature gas loading experiments the modeling was applied to translate the temperature field (steady state and transient three-dimensional analysis), then, in such a case calculations allowed to perform the calorimetry. This experiment was a replication of the MATRIX experiment performed at SRI by some of the authors.1,2 A correlation between 4He production and excess of power during gas loading of deuterium in palladium was observed. Excess of power was estimated by means of the temperature measurements and by comparing experimental data with both the calibration data and the modeling results. Also the effect of the room temperature evolution was considered in the mathematical model of the experiment. 4He tights stainless steel cell have been filled first with a Pd-based catalyst then loaded with deuterium or hydrogen (blank). After filling cells with gas we observed a different thermal behavior of the cells C1 and C2 containing deuterium, compared to the cell C4 containing hydrogen. The temperature increasing in cells C1 and C2 was estimated to be produced by an additional power source of 0.1 W. The measured excess of helium was consistent with expected value obtained by assuming that the excess of energy was produced by a D+D reaction giving 4He+heat (24 MeV). The slope of the temperature increasing was larger in cells C1 and C2, and after achieving a stationary condition for the system the temperature of cells C1 and C2 increased again. During the thermal effect an analysis of the gas was done for the cells C1 and C2. An increasing of the helium content was revealed for both the cells. The He concentration increased up to a factor larger than 2 in both cells C1 and C2. | |
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