Optimal Thermal Insulation Thickness in Isolated Air-Conditioned Buildings and Economic Analysis
Open Access
- 1 January 2020
- journal article
- research article
- Published by Scientific Research Publishing, Inc. in Journal of Electronics Cooling and Thermal Control
- Vol. 09 (02), 23-45
- https://doi.org/10.4236/jectc.2020.92002
Abstract
The removal building heat load and electrical power consumption by air conditioning system are proportional to the outside conditions and solar radiation intensity. Building construction materials has substantial effects on the transmission heat through outer walls, ceiling and glazing windows. Good thermal isolation for buildings is important to reduce the transmitted heat and consumed power. The buildings models are constructed from common materials with 0 - 16 cm of thermal insulation thickness in the outer walls and ceilings, and double-layers glazing windows. The building heat loads were calculated for two types of walls and ceiling with and without thermal insulation. The cooling load temperature difference method, CLTD, was used to estimate the building heat load during a 24-hour each day throughout spring, summer, autumn and winter seasons. The annual cooling degree-day, CDD was used to estimate the optimal thermal insulation thickness and payback period with including the solar radiation effect on the outer walls surfaces. The average saved energy percentage in summer, spring, autumn and winter are 35.5%, 32.8%, 33.2% and 30.7% respectively, and average yearly saved energy is about of 33.5%. The optimal thermal insulation thickness was obtained between 7 - 12 cm and payback period of 20 - 30 month for some Egyptian Cities according to the Latitude and annual degree-days.Keywords
This publication has 20 references indexed in Scilit:
- Economic Optimum of Thermal Insulating Layer for External Wall of BrickActa Polytechnica Hungarica, 2014
- Parametric Investigation of Optimum Thermal Insulation Thickness for External WallsEnergies, 2011
- Analytical periodic solution for the study of thermal performance and optimum insulation thickness of building walls in TunisiaApplied Thermal Engineering, 2010
- Correlation between thermal conductivity and the thickness of selected insulation materials for building wallEnergy and Buildings, 2006
- Influence of external surface colour on the periodic heat flow through a flat solid roof with variable thermal resistanceInternational Journal of Energy Research, 2003
- Analysis of variable-base heating and cooling degree-days for TurkeyApplied Energy, 2001
- An application of the degree-hours method to estimate the residential heating energy requirement and fuel consumption in IstanbulEnergy, 2000
- Heating and cooling degree-hours for TurkeyEnergy, 1999
- Optimizing insulation thickness for buildings using life cycle costApplied Energy, 1999
- An efficient solution for heat transfer in composite walls with periodic ambient temperature and solar radiationInternational Journal of Ambient Energy, 1993