The temperature of the adjoining area on the other side of the separating
partition is be raised to equal the temperature in the heated compartment, thus eliminating heat
leakage through the partition, while the (11.1°C) 20°F differential is maintained between the
heated compartment and the ambient surroundings of the other five enveloping surfaces. The
difference in heat input between the first run and the second run equals the leakage through the
partition alone