In this article the using of thermosiphon solar collectors for system air heating of premises of passive houses was examined. The research determination the air velocity and air temperature in the space of experimental module were conducted. According to the research the field of temperature and air velocity in the space of the experimental module for different output of thermal solar radiation were built. The main factors that affect the value of speed and temperature of the internal air were identified. It was established that the presence of spiral turbo baffles increases the thermal output of thermosiphon collector to 15%, and the rate of heated flow to 17%
Abstract. 1 The promising environmentally friendly solar heating systems are based on the combined solar collector, in which the absorber made of constructive material of low-energy house was described. The usage of the combined absorber with an external protection of lowenergy house ensures sufficient efficiency of combined solar collector and reduces its cost. Three-factor planning matrix with the factors interaction was developed. Analytical and graphical dependencies of efficiency of the combined solar collector with a transparent coating and without it on the angle of incidence and intensity of heat flow were shown. The efficiency of transparent coating which protects the absorber of solar collector was researched. Ecological effect of using the combined solar collector was calculated.
The article is devoted to decision of actual task of air distribution efficiency increase due to swirled air jets application. The aim of the paper is investigation of swirled air jets, analytical dependencies obtaining for determination of the air velocity attenuation coefficient, aerodynamic local resistance coefficient and noise level from the twisting plates inclination angle; optimization of the twisting plates inclination angle of the air distributor. It has been established that increase of the angle results in the air velocity attenuation coefficient increase and results in decrease of the noise level and resistance coefficient of air distributor. The optimum angle of the plates is determined considering aerodynamic, noise and energy aspects and equals 36°.
The most common ventilation system in residential buildings in Ukraine is natural ventilation. In recent years, due to increased tightness of structures, an increase in the content of synthetic finishing materials in them, the quality of microclimate parameters deteriorated. One of the measures to improve the parameters of indoor air in residential buildings is the use of mechanical inflow and exhaust ventilation system. In this article the regulatory documents concerning the design of ventilation systems in Ukraine and Estonia and the requirements for air exchange in residential buildings are considered. It is established that the existing normative documents in Ukraine are analogous to European norms, which allow design the system of ventilation of residential buildings according to European standards. However, the basis for the design of ventilation systems in Ukraine is the national standards, in which mechanical ventilation, unfortunately, is provided only for the design of high-rise buildings. To maintain acceptable microclimate parameters in residential buildings, it is advisable for designers to apply the requirements for designing ventilation systems in accordance with European standards.
The data of geological exploration works carried out in Lviv region allow us to speak about the significant energy potential of geothermal waters in this region. At present, six bore-wells have been discovered in which the temperature of geothermal waters reaches 120oC at a depth of more than 3000 m. However, today the energy potential of geothermal waters of Lviv region is not used for both technical and economic reasons. This article, analyze the most common schemes for the use of geothermal resources based on the experience of countries with developed geothermal energy For geothermal systems with parameters typical of Lviv region, the greatest effect can be achieved by using doublet systems, which consist of two wells: suction and injection, and the resulting heat energy can be used to heat a wide group of consumers.
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