APPLICATIONS OF HYBRID GROUND SOURCE HEAT PUMP SYSTEMS

1,37

MB

TO BUILDINGS AND BRIDGE DECKS

206

stron

5046

ID

Oklahoma State University

2000

rok

TABLE OF CONTENTS

1. Introduction

1.1. Overview of hybrid ground source heat pump systems

1.2. Literature review

1.3. Thesis objective and scope

2. Optimal sizing of hybrid ground source heat pump system that use a cooling pond as a

supplemental heat rejecter- A system simulation approach

2.1. Introduction

2.2. Methodology for System Simulation and Analysis

2.2.1. Building description and load calculation

2.2.2. Hybrid system configuration and component model description

2.2.3. Ground and pond loop sizing

2.3. Results and Discussion

2.3.1. Analysis of system performance of various cases

2.3.2. Summary of system performance

2.3.3. Life cycle cost analysis

2.3.4. Sensitivity analysis of the control strategy

2.4. Summary

3. Component modeling

3.1. Introduction

3.2. Selection of modeling environment

3.2.1. TRNSYS

3.2.2. HVACSIM+

3.2.2.1. HVACGEN

3.2.2.2. SLIMCON

3.2.2.3. MODSIM

3.2.3. HVACSIM+ Vs TRNSYS

3.3. Translation of component models to HVACSIM+

3.4. Component model installation

3.5. HVACSIM+ component models

3.5.1. Water-to-air heat pump

3.5.2. Water-to-water heat pump

3.5.3. Ground loop heat exchanger

3.5.4. Bridge deck

3.5.4.1. Comparison of numerical and analytical solutions under no flow conditions

3.5.4.2. Response to step change in fluid temperature

3.5.4.3. Analysis of Result and Correction

3.5.5. “Gang” of heat pumps

3.7. Comparison of system simulation results

4. Modeling of Hybrid GSHP Systems in HVACSIM+ for application in Buildings and Bridge Decks

4.1. Introduction

4.2. Problems with HVACSIM+

4.2.1. User interface

4.2.2. Input files

4.2.3. Debugging issues

4.2.3. Solver related problems

4.3. Modifications in simultaneous equation solver SNSQ

4.4. Bridge deck system with winter heating and summer recharge

4.5. Summary

5. Deicing and recharge strategies for a hydronically heated bridge deck that use hybrid GSHP

systems – The Weatherford bridge deck model

5.1. Introduction

5.2. Weatherford bridge deck

5.3. Hybrid system description

5.4. Weather data

5.5. Control strategy

5.6. System simulation results and discussion

5.6.1. Winter snow melting

5.6.2. Summer recharge

5.7. Summary

6. Conclusions and recommendations

6.1. Conclusions

6.2. Recommendations

References

Appendixes

Appendix A -- Description of component models

Appendix B – Information flow diagram of systems

Appendix C – System summary files

Appendix D – Modifications in SNSQ