Temperature-History test Sample Clauses

Temperature-History test. (T-History) DSC is an industry standard technique for determining heat capacity using a small sample (in the order of milligrams) of the PCM to be tested. DSC works by comparing the amount of heat that flows into the PCM against a blank control. A temperature program is run to heat or to cool the sample, which results in a (calculated) heat flow. During phase change of the sample, more heat is injected to ensure the temperature increase. In the case of PCMs, generally the phase change is solid-liquid (melting) or liquid-solid (crystallisation). The difference in heat flow reflects the absorbed or released amount of heat of the sample. Based on this, the latent heat during melting and crystallisation and the peak melting and crystallisation temperatures are determined. 3LC is an industry standard technique for determining the heat capacity of a PCM that uses a much larger amount of sample (~100ml). With 3LC, the thermal response of the PCM within an insulated compartment is measured as the ambient temperature is cycled between temperature limits chosen to ensure full melting and crystallisation of the PCM (normally over a 30°C range). Depending on the application, 3LC can give a much better representation of the “real world” behaviour of a PCM, because of the larger sample quantity as compared to DSC. The rate of temperature change of the PCM during measurement is also lower than it is often reached by DSC (the average temperature change rate is 0.3°C/minute). The output from 3LC is the total heat capacity (latent heat and sensible heat) within the reported temperature range, see Figure 4-1for the CrodaTherm PCM.
Sample 1
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