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Rozdział przepływu na przelewie gabionowym

Bajkowski S.

Przegląd Naukowy Inżynieria i Kształtowanie Środowiska

2006

Vol. 15, No. 2

113--120

The water level on the hydraulic structures is maintained by means of permanent or gated weirs. Conventional permanent dams are made with impermeable sills. Gated weirs are installed in rivers with low sills; the head of water on these objects is kept by movable closures. The constant concrete weirs’ role can be ful-filled also by the permeable rubble mound weirs. In the permeable stone weirs part of the water fl ows through the fill stone construction and the rest fl ows over the body. The analysis of the water discharge division into the overfl ow and the seepage flow gives the possibility of the infi ltration body and the shape of the weir profile. The geometry of the rubble sill, the grain size distribution of fill material and the localization of zones with velocity which can break stability stone elements of body, are important elements when determining the geometry of the gabion weir. Results of the laboratory on the gabion weir, including reconnaissance of the over and the trough-flow, are presented in the article. The discharge of the surface flow form was determined with the hydrometric method. The electromagnetic PEMS probe for measurement of velocity of water has been used. The degree of discharge distribution depends on hydraulic parameters of overflowing water stream.

Ground heat exchanger of heat pump installed in the region of polders or waste dumping - analysis of possible locations

Fic A., Składzień J., Hanuszkiewicz-Drapała M.

Archives of Thermodynamics

2006

Vol. 27, no. 4

79-90

Systems with horizontal and vertical ground heat exchangers (GHEs) of heat pumps (HPs) located in the ground in surroundings of a sewage-treatment plant are investigated in the paper. In the considered sewage-treatment plant about 7 000 000 m[^3] of elevated temperature water is dumped to special polders. Next, this water infiltrates the ground, what can intensify the heat transfer in the GHE located in such ground. Comparative analysis of the effectiveness of the GHEs of possible locations in the considered region is the aim of the paper. For this purpose, numerical calculations of temperature fields in the systems: GHEs - pertinent ground and the heat rate transferred in the GHEs have been carried out. Particularly, the vertical and horizontal GHEs located in the polders area and the vertical GHE located in the polders vicinity have been considered.Improvement of parameters of the HP resulting on its collaboration with the GHE of the best alternative has been also estimated.