Heat transfer characteristics of insulated concrete sandwich panel walls: Draft report
Tests were conducted to evaluate thermal performance of three insulated concrete sandwich panel walls. Heat transfer through the walls was measured for steady-state and dynamic temperature conditions. The objective of the test program was to investigate effects of ties connecting wall layers on thermal properties of insulated sandwich panel walls. The three walls tested were similar except for the type of connectors joining the insulation and concrete layers. Each wall consisted of 2-in. (50-mm) of extruded polystyrene insulation board sandwiched between two 3-in. (75-mm) normal weight concrete layers. The first wall, a control wall, contained no ties. Layers of the second wall were connected using stainless steel ties and anchors. Layers of the third wall were connected using high-tensile fiberglass-composite ties. Walls were tested in the calibrated hot box facility (ASTM Designation: C976) at Construction Technology Laboratories, Inc. (CTL). Steady-state tests were used to measure thermal resistance (R/sub T/) and thermal transmittance (U). A comparison of results from steady-state tests on the control wall and the wall with stainless steel connectors showed that stainless steel connectors reduced wall thermal resistance by 7%. A comparison of results from steady-state tests on the control wall and the wall with high-tensile fiberglass-composite ties showed that the ties did not reduce wall thermal resistance. Dynamic calibrated hot box tests provided a measure of thermal response under selected temperature ranges. Heat storage capacities of the walls delayed heat flows through specimens. Average thermal lag values ranged from 5 to 6 hours for the three walls.
- Research Organization:
- Construction Technology Labs., Skokie, IL (USA); Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 6380960
- Report Number(s):
- ORNL/Sub-79-42539/8; ON: DE87013344
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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