In the main factorial experiment, the final product centre
temperature has been kept at 18 C as this is a widely accepted
temperature for fresh foods. However, some foods such as ice
cream may require a lower final temperature. An additional factorial
experiment has therefore been carried out for final temperatures
of 30 C and 25 C and Ta = 105, 75, 55 and 40 C.
Other parameters are the same as in the previous section. Corrected
P1’s predictions give mean error (e) of 0.6%, s.d. 2.0% and
range 6% to +4%, while corrected P2 gives mean e of +0.2%, s.d.
2.1% and range 5% to +6%. Both methods therefore account well
for variations in final product temperature, with no loss in
accuracy.
4.8. Limita