Abstract

This thesis presents a study for examining the viability of hybrid ground source heat pump (GSHP) systems that use solar thermal collectors as the supplemental component in heating dominated buildings. Loads for an actual house in the City of Milton near Toronto were estimated. TRNSYS, a system simulation software tool, was used to model the yearly performance of conventional GSHP as well as the proposed hybrid GSHP system. The house was equipped with a data monitoring system which was installed to read and record fluid flow, temperature and electricity consumption in different components of the system. The actual yearly data collected from the site was examined against the simulation results. In addition, a sensitivity analysis was carried out to determine the relationship between the solar collector area and the ground loop heat exchanger (GHX) length. It was shown that the ratio of GHX length reduction to solar panel area of 4.7 m/m This study demonstrates that a hybrid GSHP system, combined with solar thermal collectors, is a feasible choice for space conditioning for heating dominated houses. It was shown that the solar thermal energy storage in the ground could reduce a large amount of ground loop heat exchanger length. Combining three solar thermal collectors with a total area of 6.81m

Highlights

  • 1.0 IntroductionThe claimed advantages of ground-source heat pump (GSHP) systems over their conventional alternatives, such as air-source and water source heat pumps make these systems attractive for space heating and air conditioning for residential and commercial as well as institutional buildings

  • This study demonstrates that a hybrid ground source heat pump (GSHP) system, combined with solar thermal collectors, is a feasible choice for space conditioning for heating dominated houses

  • The analysis showed that there is a economic benefit in comparing to GSHP

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Summary

Introduction

The claimed advantages of ground-source heat pump (GSHP) systems over their conventional alternatives, such as air-source and water source heat pumps make these systems attractive for space heating and air conditioning for residential and commercial as well as institutional buildings. Geothermal applications for buildings are mostly limited to full dependence on ground soil temperatures for 100% of the heating and cooling energy. There are advantages of low energy and maintenance costs in favour of this approach, space limitations and high initial costs may restrict a full geothermal installation. Restrictive regulations, such as mandating a minimum borehole size, grouting materials, wage rates and heat exchange methods, generally increase the cost of such a system. The initial cost may put the project above the budget, and in some cases, the drilling conditions may prevent the use of a large conventional closed-loop bore field [1, 2]

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