Carrier fluid temperature data in vertical ground heat exchangers with a varying pipe separation

Improvement in Modeling of Heat Transfer in Vertical Ground Heat Exchangers

The heat transfer model of vertical ground heat exchangers for ground-source heat pump systems is discussed. An explicit solution of a finite line-source model has been derived to better describe temperature response of boreholes for long time steps, which can be easily incorporated into computer programs for thermal analysis of ground heat exchangers. A quasi-three-dimensional model is also pr...

Improvements of U-pipe Borehole Heat Exchangers

3 PREFACE 4 ACKNOWLEDGEMENTS 5 PUBLICATIONS 6 ABBREVIATIONS AND NOMENCLATURE 7 TABLE OF CONTENTS 10 INDEX OF FIGURES 11 INDEX OF TABLES 14 1 INTRODUCTION – BASIC CONCEPTS 15 1.1 GROUND SOURCE HEAT PUMPS 15 1.2 THERMAL PROCESSES IN THE GROUND 18 1.3 SECONDARY WORKING FLUID FLOW 20 1.3.1 Hydrodynamic considerations 21 1.3.2 Thermal considerations 21 1.4 THERMAL RESISTANCES IN BHES 23 1.5 ...

Modeling of Vertical Ground Loop Heat Exchangers with Variable Convective Resistance and Thermal Mass of the Fluid

The ability to predict the short-term behavior of ground loop heat exchangers (GLHE) is critical to the design and energy analysis of ground source heat pump (GSHP) systems. Thermal load profiles vary significantly from building to building – GLHE designs can be dominated by long-term heat build-up or short-term peak loads. In some extreme cases, where the GLHE design is dominated by short-term...

Literature Review on the Calculation of Vertical Ground Heat Exchangers for Geothermal Heat Pump Systems

The calculation of Ground Heat Exchanger (GHE) performance is very important for predicting the performance and estimating the initial cost of geothermal heat pump systems. In North America it is estimated that on average GHE are oversized by about 10% ~ 30%. A vertical Ground Heat Exchanger (VGHE) is most common because of its smaller environmental influence and land field requirement. This pa...

Heat Transfer to Separation Flow in Heat Exchangers