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Journal of Thermal Analysis and Calorimetry

, Volume 132, Issue 2, pp 1253–1262 | Cite as

Analysis of thermal properties and heat transfer mechanisms for polyurethane foams blown with water

  • Sung Woong Choi
  • Jae Min Jung
  • Hyeong Min Yoo
  • Sung Ha Kim
  • Woo Il Lee
Article

Abstract

Rigid polyurethane foam (PUF) is one of the outstanding insulation materials and has been widely used in freezers and cryogenic facilities. Among the various blowing agents used in the manufacturing PUF, water-blown PUF is attracting much attention as environmentally friendly PUF as prominent replacements for the environmentally hazardous CFCs and HCFCs due to their significant ozone depletion potential. We investigated the effective thermal conductivity of PUF blown with different amounts of water, on the basis of the heat transfer mechanisms in terms of thermal conduction of solids and gases and the thermal conductivity of radiation in the cells. A predictive model for the effective thermal conductivity of PUFs with different densities is presented. The predictive model was validated by comparing the predicted values with the experimentally measured ones. The result showed that the effective thermal conductivity increased from 0.023 to 0.027 W m−1 K−1 as the PUF density increased from 48 to 120 kg m−3: increased by 158% from 0.0034 to 0.0089 W m−1 K−1 for the thermal conductivity of solid PUF and decreased by 50% from 0.0037 to 0.0018 for the thermal conductivity of radiation.

Keywords

Rigid polyurethane foams Effective thermal conductivity Thermal conductivity of radiation Extinction coefficient Morphology 

List of symbols

d

Mean cell diameter (m)

e

Spectral blackbody emissive power (W m−2 µm−1)

fs

Fraction of solid in the struts

kfoam

Solid polymer thermal conductivity (W m−1 K−1)

L

Thickness of the sample (m)

n

Refractive index of the porous media

λeff

Effective thermal conductivity (W m−1 K−1)

λg

Conductivity of the blowing gas (W m−1 K−1)

λr

Thermal conductivity of radiation in the cell (W m−1 K−1)

λs

Thermal conductivity in solid polyurethane foam (W m−1 K−1)

Sv

Surface area to volume ratio of the cell

tcw

Cell wall thickness (m)

T

Mean foam temperature (K)

T

Spectral transmittance

Greek symbols

δ

Void fraction in polyurethane foam

σ

Stefan–Boltzmann constant

β

Total extinction coefficient

ρf

Density of the PUF

ρs

Density of the solid polymer

βs

Extinction coefficient of a single polymer cell wall

σ

Spectral extinction coefficient

φ

Constant refractivity

Notes

Acknowledgements

The first author, Dr. Choi, thanks the Civil-military technology cooperation program funded by the ministry of Trade, Industry & Energy and Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (NRF-2015R1A2A2A01006203).

Compliance with ethical standard

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2018

Authors and Affiliations

  1. 1.LNG Cryogenic Technology CenterKorea Institute of Machinery and MaterialsNongso-ri, Juchon-myeon, Gimhae-si, Gyeongsangnam-doRepublic of Korea
  2. 2.School of Mechanical and Aerospace EngineeringSeoul National UniversitySeoulRepublic of Korea

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