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.72 Thermal conductivity EPS W/(m.K) 0.040 0.040 0.045 0.035 0.040 0

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1 Introduction Metallic foams have many good properties due to the existence of pores in their composite structures such as low density, sound insulation performance and good energy absorption, low thermal conductivity, etc. [ 1–7 ]. Over recent

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Pollack Periodica
Authors:
Istvan Ervin Haber
,
Gergely Bencsik
,
Basma Naili
, and
Istvan Szabo

area [m 2 ]; U is the heat transfer coefficient [W m −2 K −1 ]; the l is conduction length [m] and Ψ is thermal conductivity [W m −1 K −1 ]. The heat capacity for the structure is not calculated in this section of the simplified method, but the

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Pollack Periodica
Authors:
Humam Kareem Jalghaf
,
Ali Habeeb Askar
,
Hazim Albedran
,
Endre Kovács
, and
Károly Jármai

respectively and k is the thermal conductivity of the pipe wall. Equation (19) represents the Nusselt number, which is estimate based on thermal conductivity of hot water, the pipe side heat transfer coefficient, and the pipe diameter, [ 20 ]. (19) N u h

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Pollack Periodica
Authors:
Gábor Rózsás
,
György Bognár
,
Gábor Takács
, and
Balázs Plesz

improved channel type includes metal foam in the channels. Metal foam has a high surface area per unit volume, thermal conductivity and tortuous flow path to promote mixing is an ideal candidate for thermal management applications [ 21 ]. Another cooling

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Pollack Periodica
Authors:
Ali Kareem Abdulrazzaq
,
György Bognár
, and
Balázs Plesz

model (mainly the solar irradiance); PV module technological and material parameters and properties (such as thermal conductivity, kinematic viscosity, Prandtl number and cell efficiency); and structural parameters of the PV cell that define its

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= freezing temperature (°C) (calculated by needle-based thermocouple) T a = freezing temperature of medium (°C) h = convective heat transfer coefficient at the surface of the food (h =7.26 W m -2 k -1 ) k f = thermal conductivity of the frozen food (k =1

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. 2 . Fig. 2. Nusselt vs. Reynolds number at v = 0.5–5 m s −1 Subsequently, the average air convection coefficient is found by h a = N u · k a ∅ , (6) where k a is the thermal conductivity of air at atmospheric pressure. The relation between the

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hollow section ,” Thin-Walled Struct. , vol. 98 , Part A , pp. 196 ‒ 211 , 2016 . [11] I. Žmak and T. Filetin , “ Predicting thermal conductivity of steels using artificial neural networks ”, Trans. FAMENA , (University of Zagreb, Faculty of

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–300 Water uptake ( W ) kg/m 2 1–5 Thermal conductivity ( λ ) W/m K 0

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