Abstract
Renewable energy sources for the purpose of heating buildings cooperate perfectly with so-called low-temperature heating systems. Water loop surface heating systems had been thoroughly tested. In contrast, thermal performance of wall panels with heat pipes have not been fully recognized, yet. The determination of the thermal power as well as the control of panels thermal performance cannot be performed with the methods developed for water loop systems. In this paper, the novel heating panels with heat pipes were tested to analyze the possibility of controlling their performance by changing the mass flowrate of heating water and its temperature. Specific heating power of the investigated panels varies from 16.9 W/m2 to 93.8 W/m2 when supplying a water temperature ranging from 35 °C to 65 °C and mass flowrate from 10 g/s to 47.5 g/s. Investigations revealed that the thermal performance of the panels is more sensitive to the changes of temperature than to the changes of mass flowrate of supplying water, and thus, should be controlled by changing the supply water temperature at low mass flowrates to obtain a low energy usage of pumps (diminished pressure losses) and good quality of controlling.
Highlights
One of the main aims when erecting buildings is to assure safety and comfort for their users.In the context of climate change and the depletion of non-renewable energy resources, contemporary construction faces an additional challenge: buildings must be energy-efficient and renewable energy sources should be used for supplying them
The specific heating power of the panel varies from 16.9 W/m2 to 93.8 W/m2 for supplying water temperatures ranging from 35 ◦ C to 65 ◦ C and a mass flowrate from 10 g/s to 47.5 g/s, The obtained heating power is sufficient for heating low-energy buildings using the available surface of external or external and internal walls, The thermal performance of the panel is more sensitive to the changes of temperature than to the changes of mass flowrate of the supplied water, An increase of the water mass flowrate by 375% for the lowest supply water temperature 35 ◦ C
Resulted in an insignificant increase of specific thermal power by 6.0 W/m2 for purposes of building heating; an analogous increase in the case of supply water temperature 65 ◦ C was 18.2 W/m2, The investigated wall-type panels with heat pipes should be controlled mainly by the changing of the supply water temperature at low mass flowrates, which are conducive to achieving low flow resistance, and lower electricity consumption to drive central heating circulation pumps
Summary
One of the main aims when erecting buildings is to assure safety and comfort for their users. In the context of climate change and the depletion of non-renewable energy resources (e.g., gas, coal, oil etc.), contemporary construction faces an additional challenge: buildings must be energy-efficient and renewable energy sources should be used for supplying them. In cold and moderate climates, the energy demand for heating exceeds the energy demand for cooling purposes. The forecast of cooling needs increase, described in Ref. There is a growing interest in the various methods of natural shading and limiting the influence of solar radiation on thermal comfort in the buildings, which was described in Ref. In cold and moderate climates, buildings have to be heated
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