Abstract
All energy processes in buildings are usually unsteady, ie time dependent. But mostly the unsteady factors influence is not taken into consideration for energy demands, microclimate changes estimating. Therefore the practical observations and theoretical investigations show an undesirable behaviour of indoor thermal microclimate and energy use, even with modern enough control systems. As a result, new methods for problem solution and investigations develop. The paper presents some theoretical aspects of unsteady heat transfer analysis based on the energy conservation law. Additionally, an experimental research made at Solar energy investigation centre in Spain ‐ Plataforma Solar de Almeria - results and its comparison with theoretical calculations are produced.
Highlights
Heat transfer processes in buildings are always unsteady under real conditions
Practical heat exchange calculations in buildings are based on steady-state process equations
Practical observations and theoretical investigations show an undesirable behaviour of indoor thermal microclimate and energy use, even with modern enough control systems [1]
Summary
Heat transfer processes in buildings are always unsteady under real conditions. Unvalued heat inflows cause too high heating power and building overheating, and intermittent heating rises problem of too low installed power or long preheating time. The result of these reasons is a wrong buildings maintaining the indoor climate does not satisfy the hygienic requirements. The solution of unsteady heat transfer problems can be reached on the basis of thermodynamics laws, the conservation of energy for a control volume. For many heat transfer problems the first law of thermodynamics (the law of energy conservation) provides a useful, often essential, tool [5]
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