Ghazi Wakili, K; Bundi, R and Binder, B (2004) Effective thermal conductivity of vacuum insulation panels. Building Research & Information, 32(4), pp. 293-299. ISSN 0961-3218
Abstract
Vacuum insulation panels (VIPs) with evacuated fumed silica as the core material and different barrier envelopes were subjected to a series of tests in a guarded hot plate apparatus. The process was conducted to determine thermal conductivity at the centre-of-panel and the edge effect, i.e. the linear thermal transmittance due to the thermal conductivity of the barrier envelope, which is many orders of magnitude higher than that of the evacuated fumed silica. Numerical simulations using a two-dimensional model were carried out in parallel and compared with measured results. In a further step, the influences of different parameters such as panel size, metal layers in the barrier envelope and the shape of the joint between two adjacent VIPs were quantified. Based on these findings, an effective thermal conductivity can be attributed to a system of VIPs. Investigations were performed within the framework of an international research programme of the IEA, Annex 39 'High Performance Thermal Insulation in Buildings and Building Systems', Subtask B.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | alternative materials; edge effect; fumed silica; linear thermal transmittance; thermal conductivity; vacuum insulation |
| Index terms: | investigation, thermal conductivity, metal, numerical simulation, building system, programme, alternative material, thermal insulation, linear thermal transmittance, insulation |
| Subjects: | modelling and simulation, engineering systems, materials science, traditional and composite building materials, project controls, material properties and characteristics, data collection methods, thermal systems, energy systems, building materials |
| Topics: | Time Control, Design Practice, Research Practice, Construction Materials, Engineering Principles |
| Descriptive scope: | 3 PCA |
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