The density of the pipes, subway tunnels and gas lines that crowd the space beneath the city streets limits Con Ed's ability to lay the electric wires any deeper than they already are, Mr. Olert said.
Simple expressions for the modal density of fluid filled pipes and for the input power from mechanical and fluid point sources are derived.
Slinky-coil horizontal ground heat exchangers, which are basically coiled ground heat exchangers, require less land space than conventional straight horizontal ground heat exchangers because of the higher installation density of heat exchange pipes per given area.
Either the elastic modulus or the density of the AFG cantilevered pipe is assumed to be varied from the clamped to the free ends.
It is found that, compared with uniform pipes, the decrease of density along the pipe length leads to a more stable system, while the opposite result may be obtained for the decrease of elastic modulus for small values of mass ratio.
As a result, depending on the pipeline scale, equal density differences require a different number of pipe diameters for the achievement of the same level of homogenization.
This reduces the density of the fluid column inside the pipe so that, if the top of the pipe is not too far above the surface of the water, the air-water mixture will overflow it.
Tests were carried out at the Water Engineering Laboratory of the University of Perugia (WEL) on two high density polyethylene pipe systems.
They usually rest on the sea floor, thanks to water pressure, the weight of the pipe and the density of the contents.
This is achieved through the investigation of the influence of the temperature, thermal conductivity, specific heat and density of the ground as well as pipe diameter on the performance of GHEs using computer software modelling in conjunction with test data.
