A STUDY OF THEORETICAL AND EXPERIMENTAL OF COOLING PROCESS IN A GEOTHERMAL ENERGY SYSTEM  BY USING A PROTOTYPE

ODAY A.  ABBO

doi:10.26682/sjuod.2021.24.1.13

ODAY A. ABBO Dept. of Mechanical Engineering, College of Engineering, University of Duhok

DOI: https://doi.org/10.26682/sjuod.2021.24.1.13

Keywords: Horizontal heat exchanger; Heat transfer; Geothermal; Energy efficiency

Abstract

An Experimental and Theoretical of horizontal geothermal heat Exchanger which is investigated by using a prototype, Experimental setup depend on Thermoelectric Peltier kits to give required cooling or heating for grout. A closed loop system pump and borehole heat exchanger tested in by using Horizontal helical polyethylene pipes with a diameter inside that equal 4mm which immersed in a grout. Our Goal is to improve the rig design by using analytical solution.

A theoretical analysis was improved for horizontal ground heat exchangers (HGHEs) which integrate with water pump by using the basic equation of two-dimensional conduction convection heat transfer for laminar flow 500<Re<2300, Basic analysis is made for Trench method with doubles pipes as whole resistance borehole. Compression between Theoretical and experimental is made with different temperature and the water mass flow rate is between 0.0014 to 0.0063 kg/s. the result of Nusselt Reynolds Numbers gave a good indication of the efficiency for the device which is between 20 to 80% depend on Reynolds Number, Heat exchanger effectiveness also prepares the low Reynolds Number gave high effectiveness as compared with higher Reynolds Number dependence on water residence time inside HGHE. A comparison between Experimental and theoretical gave an error less than 5% difference.

Result show that device can use to improve the researches in use of geothermal resource and heat pump analysis by choosing the best parameter which found by prototype in actual case

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