Abstract
This article presents the issue of the use of the control-volume finite-elements method (CVFEM) to solve transient heat conduction problem in the ceramic or concrete structure of heat storage system. The system can be used as auxiliary storage in solar based domestic hot water (DHW) and heating installations. The storage system consists of modular symmetric components forming parallel air channels. The modular design and symmetry of cross section enables to build a simple numerical model using a coarse mesh of finite volumes. It allows solving the problem using the simple algorithm. Analyzed method of modeling provides a short computation time while maintaining high calculation accuracy.
Highlights
The use of the thermal capacity of solid materials for heat storage is an alternative to heat storage systems in water tanks
The idea of heat storage using the thermal capacity of solid materials has been known since ancient times
In ACPS systems, heat obtained from solar collectors is transferred directly to heated objects characterized by high thermal capacity
Summary
The use of the thermal capacity of solid materials for heat storage is an alternative to heat storage systems in water tanks. Despite the lower thermal capacity, the accumulation material can be incorporated into the structure of a building or can be a part of its construction. It creates many possibilities for innovative solutions for heating systems. In ACPS systems, heat obtained from solar collectors (air, liquid) is transferred directly to heated objects characterized by high thermal capacity. Short and Kutscher [1] investigated a hybrid building heating system with a concrete accumulator with a channel structure in the form of a concrete floor slab The air heated in the collector was directed to the airwater heat exchanger, which, as a result, heated domestic hot water. In the research carried out by YuXiang and Athienitis [12,13,14,15], the use of a ventilated ceiling slab (VCS Ventilated Concrete Slab) was described as a heat accumulating element obtained from a solar installation equipped with a BIPV (Building Integrated Photovoltaic) collector integrated with the roof
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