subpage of http://coldfusioncommunity.net/morrison-fleischmann-debate/original/

##### Modelling of the Calorimeters

The temperature-time variations of the calorimeters have been shown to be determined by the differential equation [1]

In equation [1] the term allows for the change of the water equivalent with time;

the term β was introduced to allow for a more rapid decrease than would be given by electrolysis

alone (exposure of the solid components of the cell contents, D_{2}O vapour carried off in the gas

stream). As expected, the effects of β on Q_{f} and K0R can be neglected if the cells are operated below 60°C. Furthermore, significant changes in the enthalpy contents of the calorimeters are normally only observed following the refilling of the cells with D_{2}O (to make up for losses due to electrolysis and evaporation) so that it is usually sufficient to use the approximation [2]

The term allows for the decrease of the radiant surface area with time but, as we have already noted, this term may be neglected for calorimeters silvered in the top portion

(however, this term is significant for measurements made in unsilvered Dewars ^{(1)}; see also ^{(7)}). Similarly, the effects of conductive heat transfer are small. We have therefore set Φ = 0 and have made a small increase in the radiative heat transfer coefficient *k ^{0}_{R}* to

*k’*

^{R }to allow for this

assumption. We have shown (see Appendix 2 of

^{(1)}) that this leads to a small underestimate of Q

_{f}(t); at the same time the random errors of the estimations are decreased because the number of parameters to be determined is reduced by one.

We have also throughout used the temperature of the water bath as the reference value and

arrive at the simpler equation which we have used extensively in our work:

##### GLOSSARY OF SYMBOLS USED

** C_{P,O2,g}** Heat capacity of O

_{2}, JK

^{-1}mol

^{-1}.

*Heat capacity of D*

**C**_{P,D2,g}_{2}, JK

^{-1}mol

^{-1.}

*Heat capacity of liquid D2O, JK-1mol-1.*

**C**_{P,D2O,l}*Heat capacity of D2O vapour, JK-1mol-1.*

**C**_{P,D2O,g}*Measured cell potential, V*

**E**_{cell}*Measured cell potential at the time when the initial values of the parameters are evaluated, V*

**E**_{cell,t=0}*Potential equivalent of the enthalpy of reaction for the dissociation of heavy water at the bath temperature, V*

**E**_{thermoneutral bath}*Faraday constant, 96484.56 C mol*

**F**^{-1}.

*Heaviside unity function.*

**H***Cell current, A.*

**I***Heat transfer coefficient due to radiation at a chosen time origin, WK*

**k**^{0}_{R}^{-4}

**Effective heat transfer coefficient due to radiation, WK**

*(k’*_{R})^{-4}Symbol for liquid phase.

**L**Enthalpy of evaporation, JK

^{–}1mol

^{-1}.

**M**Heavy water equivalent of the calorimeter at a chosen time origin, mols.

^{0}*Partial pressure, Pa; product species. P* Atmospheric pressure*

**P****P***Rate of generation of excess enthalpy, W.

*Time dependent rate of generation of excess enthalpy, W.*

**Qf(t)****T**Time, s.

*Symbol for vapour phase.*

**Ν****∆**

*Rate of heat dissipation of calibration heater, W.*

**Q****Δ**

*Difference in cell and bath temperature, K.*

**θ****Absolute temperature, K.**

*Θ***Bath temperature, K.**

*θbath***Λ**Slope of the change in the heat transfer coefficient with time.

**Φ**Proportionality constant relating conductive heat transfer to the radiative heat transfer term.

##### References

1. Martin Fleischmann, Stanley Pons, Mark W. Anderson, Liang Jun Li and Marvin

Hawkins, J. Electroanal. Chem., 287 (1990) 293. *[copy]*

2. Martin Fleischmann and Stanley Pons, Fusion Technology, 17 (1990) 669. *[Britz Pons1990]*

3. Stanley Pons and Martin Fleischmann, Proceedings of the First Annual Conference on Cold Fusion, Salt Lake City, Utah, U.S.A. (28-31 March, 1990). *[unavailable]*

4. Stanley Pons and Martin Fleischmann in T . Bressani, E. Del Guidice and G.

Preparata (Eds), The Science of Cold Fusion: Proceedings of the II Annual Conference on Cold Fusion, Como, Italy, (29 June-4 July 1991), Vol. 33 of the Conference Proceedings, The Italian Physical Society, Bologna, (1992) 349, ISBN 887794-045-X. *[unavailable]*

5. M. Fleischmann and S. Pons, J. Electroanal. Chem., 332 (1992) 33. *[Britz Flei1992]*

6. W. Hansen, Report to the Utah State Fusion Energy Council on the Analysis of Selected Pons-Fleischmann Calorimetric Data, in T. Bressani, E. Del Guidice and G. Preparata (Eds), The Science of Cold Fusion: Proceedings of the II Annual Conference on Cold Fusion, Como, Italy, (29 June-4 July 1991), Vol. 33 of the Conference Proceedings, The Italian Physical Society, Bologna, (1992) 491, ISBN 887794-045-X. *[link]*

7. D. E. Williams, D. J. S. Findlay, D. W. Craston, M. R. Sene, M. Bailey, S. Croft, B.W. Hooten, C.P. Jones, A.R.J. Kucernak, J.A. Mason and R.I. Taylor, Nature, 342 (1989) 375. *[Britz Will1989]*

9. R.H. Wilson, J.W. Bray, P.G. Kosky, H.B. Vakil and F.G. Will, J. Electroanal. Chem., 332 (1992) 1. *[Britz Wils1992]*