ests at φ = 1? Yes it is impossible to do this in the Accelerating Rate Calorimeter as it is impossible to do this in other adiabatic calorimeters.
The desire to carry out testing at low φ and the idea of using φ = 1.01 seems desirable but in many cases is not necessary. Lowφ testing is important. A fully adiabatic experiment is what is desired. Phi is just one part of error in adiabatic calorimetry. Low φinstruments may minimise the heat lost into the sample container but what about heat loss from the sample/container system, a loss that is very difficult quantify ?
In the Accelerating Rate Calorimeter the aim was to make heat loss from the sample/container negligible and in successfully doing this, the thermal inertia of the system, φ, must be somewhat higher. But not very much higher – and low φ test cells are available for the Thermal Hazard Technology Accelerating Rate Calorimeter, which will give a φ of 1.1 or below.
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Reference:
ARC Technical Information Sheet No. 24, Thermal Hazard Technology, UK
