Abstract
Energy saving in buildings is one of most important issues for European countries. Although in the last years many studies have been carried out in order to reach the zero-consumption house the energy rate due to passive solar heating could be further enhanced. This paper proposes a method for increasing the energy rate absorbed by opaque walls by using a two phase loop thermosyphon connecting the internal and the external façade of a prefabricated house wall. The evaporator zone is embedded into the outside facade and the condenser is indoor placed to heat the domestic environment. The thermosyphon has been preliminary designed and implanted into a wall for a prefabricated house in Italy. An original dynamic thermal model of the building equipped with the thermosyphon wall allowed the evolution of the indoor temperature over time and the energy saving rates. The transient behaviour of the building has been simulated during the winter period by using the EnergyPlusTM software. The annual saving on the heating energy is higher than 50% in the case of a low consumption building.
Highlights
Energy saving in buildings is one of the most important issues in European countries
This paper proposes an innovative method to increase the energy rate coming from the solar opaque elements by using a loop two phase thermosyphon which directly connects the internal and the external house wall surfaces
The indoor air temperature in the case of Wall Thermosyphon (WT) embedded shown in Figures 6 and 7 are both referred to the case 1
Summary
Energy saving in buildings is one of the most important issues in European countries. One of the most effective methods is the use of passive solar energy, which is directly supplied to buildings through the windows and through the opaque walls. This paper proposes an innovative method to increase the energy rate coming from the solar opaque elements by using a loop two phase thermosyphon which directly connects the internal and the external house wall surfaces. Zhang et al [1] presented a paper on a loop-heat-pipe based solar thermal facade (LHPSTF) installed in a reference residential building. They studied the technical evaluation and the economic advantages of applying this solution in three typical European climates, including North Europe (Stockholm), West Europe (London) and South Europe (Madrid). The research results indicated that the LHP-STF could contribute to the hot water heat load throughout the year, with substantially reduced heating
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