Construction and test of a new compact TRT equipment

Sammanfattning: A relevant contribution to sustainable development can be achieved by providing efficient solutions for heating buildings. The use of a heat pump taking heat from the bedrock with the help of a borehole heat exchanger is a common solution in Sweden to accomplish this. In situ measurement of the thermal conductivity of the ground by means of thermal response test is necessary for medium to large size installations to ensure proper sizing of the borehole system. This master thesis was done in cooperation with the department of geo energy at the company Bengt Dahlgren. The aim was to design a new compact thermal response test equipment, test it on a coaxial borehole heat exchanger and evaluate the test results and design a simple business model for using the equipment commercially. The company already had an equipment for thermal response tests, which formed the basis for the new equipment. A literature review was done to gain knowledge on thermal response test equipment, its components and borehole heat exchangers. Also, an evaluation of results from an earlier test of an 800 m deep borehole with a coaxial borehole heat exchanger was made. The project resulted in the construction of a new more compact equipment for thermal response tests with a new, improved heating solution. Two different business models based on renting out the equipment were designed. The equipment was tested on a 200 m deep borehole with a coaxial borehole heat exchanger. The test indicated a thermal conductivity of 2.46