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  2. Perm (unit) - Wikipedia

    en.wikipedia.org/wiki/Perm_(unit)

    A variant of the metric perm is used in DIN Standard 53122, where permeance is also expressed in grams per square meter per day, but at a fixed, "standard" vapor-pressure difference of 17.918 mmHg. This unit is thus 17.918 times smaller than a metric perm, corresponding to about 0.084683 of a U.S. perm.

  3. Transient hot wire method - Wikipedia

    en.wikipedia.org/wiki/Transient_Hot_Wire_Method

    The transient hot wire method has advantage over the other thermal conductivity methods, since there is a fully developed theory and there is no calibration or single-point calibration. Furthermore, because of the very small measuring time (1 s) there is no convection present in the measurements and only the thermal conductivity of the fluid is ...

  4. Thermal conductivity measurement - Wikipedia

    en.wikipedia.org/wiki/Thermal_conductivity...

    The transient hot wire method has advantage over the other thermal conductivity method since there is a fully developed theory and there is no calibration or single-point calibration. Furthermore, because of the very small measuring time (1 s) there is no convection present in the measurements and only the thermal conductivity of the fluid is ...

  5. Time-domain thermoreflectance - Wikipedia

    en.wikipedia.org/wiki/Time-domain_thermoreflectance

    Time-domain thermoreflectance (TDTR) is a method by which the thermal properties of a material can be measured, most importantly thermal conductivity.This method can be applied most notably to thin film materials (up to hundreds of nanometers thick), which have properties that vary greatly when compared to the same materials in bulk.

  6. Heat transfer coefficient - Wikipedia

    en.wikipedia.org/wiki/Heat_transfer_coefficient

    A simple method for determining an overall heat transfer coefficient that is useful to find the heat transfer between simple elements such as walls in buildings or across heat exchangers is shown below. This method only accounts for conduction within materials, it does not take into account heat transfer through methods such as radiation.

  7. Thermal conductance and resistance - Wikipedia

    en.wikipedia.org/wiki/Thermal_conductance_and...

    Thermal Conductivity: Theory, Properties, and Applications. Springer Science & Business Media. ISBN 978-0-306-48327-1. Younes Shabany (2011). Heat Transfer: Thermal Management of Electronics. CRC Press. ISBN 978-1-4398-1468-0. Xingcun Colin Tong (2011). Advanced Materials for Thermal Management of Electronic Packaging. Springer Science ...

  8. ASHRAE 55 - Wikipedia

    en.wikipedia.org/wiki/ASHRAE_55

    The third method is to add all the clo value of each garment to match the clothing ensemble in question. [1] The fourth method described in ANSI/ASHRAE Standard 55 can be used to determine the clothing insulation in mechanically conditioned spaces. This method is based on the concept that when occupants choose their clothing according to their ...

  9. NTU method - Wikipedia

    en.wikipedia.org/wiki/NTU_Method

    The method proceeds by calculating the heat capacity rates (i.e. mass flow rate multiplied by specific heat capacity) and for the hot and cold fluids respectively. To determine the maximum possible heat transfer rate in the heat exchanger, the minimum heat capacity rate must be used, denoted as C m i n {\displaystyle \ C_{\mathrm {min} }} :