Numerical analysis of heat exchanger with uniform heat flux used in heat pumps systems

[摘要] The paper presents a numerical analysis of an innovative heat exchanger with uniform heat flux, integrated as a cold source, for heating and air-conditioning systems which are equipped with heat pumps. The ground-water or water-water surface heat exchanger type is modelled, having variable geometry, uniform efficiency and heat flux along the system. The purpose of the work is to analyse a heat exchanger with uniform thermal flux, in order to offer an alternative to actual technical solutions using polyethylene pipes mounted in parallel on horizontal or vertical drilling. For typical geothermal heat exchangers, both the surface and the depth are characterized by non-uniform exploitation of the soil. The uniformity of the thermal load of the earth mass can be an energy efficiency solution in terms of optimizing the storage capacity and consequently the reduction of the land used, respectively the length of the drilling needed for mounting the source. The analysed heat exchanger with uniform thermal flux, designed to achieve low or medium sources of thermal energy, offers an efficient energy consumption, being environmentally friendly and has a reduced relative cost. It can be an attractive alternative for the residential buildings or Nearly Zero-Energy Buildings (NZBE).

[发布机构] Gheorghe Asachi Technical University of Iai, 67 Dimitrie Mangeron Bvd, Romania^1

[学科分类] 土木及结构工程学

[关键词] Heating-and-air conditioning system;Innovative heat exchangers;Polyethylene pipes;Residential building;Technical solutions;Uniform heat flux;Variable geometry;Vertical drilling