Ground heat is a renewable resource that is readily available for buildings in cool climates, but its relatively low temperature requires the use of a heat pump to extract it for heating. We developed a system that uses low temperature ground heat directly in a building wall to reduce transmission heat losses. The Active Low Exergy Geothermal Insulation Systems (ALEGIS) minimizes exergy demand ...

The heat exchanger in a heat pump can be modelled by the zero Mach-number limit of the Euler equations of compressible fluid flow. This system turns out to be a coupled hyperbolic/parabolic equation with coupled, time-dependent boundary conditions. Using the theory of abstract differential-algebraic equations it is shown that the frozen coefficient system has ADAE index 1. Moreover, the much st...

Ground-Coupled Heat Pumps (GCHP) are among the most efficient systems to heat and cool buildings. The high initial cost of these systems has hindered their growth in particular for residential applications. Better design methods are welcome to try to optimize the size and then the initial cost of these systems. In the field of ground heat exchanger design, the short-time behavior, which was bef...

Ground-source heat pump systems are renewable and highly efficient HVAC that utilise the ground to exchange via exchangers (GHEs). This study developed a detailed 3D finite element model for horizontal GHEs by using COMSOL Multiphysics validated it against fully instrumented system under loading conditions of rural industries in NSW, Australia. First, yearly performance evaluation straight show...

In this work, the compound flow control method (passive and active) has been described. EHD actuators as wire-plate (active) and splitter plate (passive) were coupled and applied to control fluid flow and heat transfer around cylinder in cross flow. Investigation consists of the interaction between electric field, fluid flow and temperature field. Experimental tests included various positions o...

Title of Dissertation: INVESTIGATION OF VAPOR INJECTION HEAT PUMP SYSTEM WITH A FLASH TANK UTILIZING R410A AND LOW-GWP REFRIGERANT R32 Xing Xu, Doctor of Philosophy, 2012 Dissertation Directed by: Professor Reinhard Radermacher Department of Mechanical Engineering Vapor injection technique has proven to be effective in improving heat pump system performance, especially for cooling application a...

this pump could be used to irrigate the regions where ground water level is close to land surface and thire is enough wind energy in the region. since advanced pumps are costly, this pump is designed only to send up water one meter high with the flow of one.inexperimental fluid mechanics laboratory of orrsay france amodel of this pump was conducted. results show that the pump could be manufactu...

This paper studies the efficiency of ground source heat pump(GSHP) used in refrigeration and heating, comparing it with air pump (ASHP) by means theoretical analysis experiment. The results were as follows, cooling GSHP summer is higher than that heating winter because transferred from high temperature to low during summer, which can be compared pipe; By calculating power consumption fan, found...