Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
CONSTRUCTAL DESIGN OF ASSEMBLIES OF MULTI-SCALE HEAT PUMPS SERVED BY A SINGLE UNDERGROUND HEAT EXCHANGER
Submission Author:
Marcelo Risso Errera , PR
Co-Authors:
Marcelo Risso Errera
Presenter: Marcelo Risso Errera
doi://10.26678/ABCM.COBEM2019.COB2019-1560
Abstract
The soil may provide inertial thermal energy for engineering applications such as underground heat exchangers for thermal comfort of buildings. This work presents the basis for design of high-order assemblies of multi- scale heat pumps that share a single underground heat exchanger in "U" shape. The method of Constructal Design was employed in order to explore the design possibilities under given constraints. The goal is the overall performance of heat-pumps assemblies of up to 4th order measured by the net enthalpy gain. The heat-pumps power requirements were represented by a fixed outlet temperature and variable mass flow rate of water that would leave the cycle evaporator and merges into the underground heat exchanger. Also variable is the length of soil available to couple each heat-pump. A combinatorial set of configurations of heat-pumps typology was determined in order to illustrate the method. The physics of the study relies on the 3-d heat transfer by convection inside a buried tube and heat conduction in a finite portion of soil. Computational simulations were carried out in a commercial CFD software. Results showed the matter of designing assemblies from heat pumps that share a common underground heat exchanger is far from trivial and that this work puts forth the basis for such.
Keywords
Constructal Design, Geothermal Energy, District heating, underground heat exchanger, Renewable energy integration
