Abstract:
The most vital element in evaluating the thermal efficiency of a geothermal coupled heat pump system is the thermal layout of a borehole. It necessitates an understanding of the borehole's U-tube configuration and design. For the ground-coupled heat pump's thermal equipment designer, the heat transfer rate and borehole design provide significant obstacles. The current model is a mathematical numerical technique that has been used to solve such a problem. For a heat pump used for cooling reasons in the summer, a thermal evaluation was devised to quantify the total energy wasted to the ground zone. The thermal performance of a single U-tube borehole that circulates water as a thermal transfer medium was assessed using the COMSOL Multiphysics 5.6 software. For this investigation, the (Heat Transfer) module was used with the (Stationary) study option. The model incorporates both heat conduction in solids, such as tube metal, grout, and soil, as well as thermal medium fluid flow within the U-tubes. Numerical solutions for heat exchangers with set borehole shape, diameter, and depth, as well as constant operating parameters in a steady-state configuration, were compared. The effects of drilling depth and time on mean fluid temperature, overall borehole wall, grout, and surrounding temperature of the soil, in addition with borehole loads, were explored. A dynamic simulation was used too to evaluate the impact of key data. The effect of two data, fluid mass flow rate and grout heat conductivity, over mean fluid temperature, borehole wall, grout, and soil temperature, in addition with borehole loading and heat efficiency, was studied. The findings will allow researchers to save time by immediately determining the effect of different data on the working effectiveness of a vertical single U-tube borehole heat exchanger. Moreover, this acquired finding may be used as guide for designing as well as optimizing a heating and cooling system that incorporates a ground coupled heat pump configuration.
Description:
Supervised by
Md. Abul Kalam Azad,
Assistant Professor,
Department of Mechanical and Production Engineering (MPE),
Islamic University of Technology (IUT),
Board Bazar, Gazipur-1704, Bangladesh.
This thesis is submitted in partial fulfillment of the requirements for the degree of Bachelor of Science in Mechanical and Production Engineering, 2022.
