| | INTEGRATING A GROUND LOOP HEAT EXCHANGER MODEL INTO A |
| | 1,01 | | MB | BUILDING SIMULATION PROGRAM |
| | 214 | | stron |
| | 6390 | | ID | Oklahoma State University |
| | 1994 | | rok |
| | TABLE OF CONTENTS |
| | 1. Introduction 1 |
| | 1.1 Overview. 1 |
| | 1.2 Literature Review and Background 2 |
| | 1.2.1 An Overview of Ground Loop Heat Exchangers. 2 |
| | 1.2.2 Ground Loop Heat Exchanger Models 3 |
| | 1.2.2.1 Line Source Model . 3 |
| | 1.2.2.2 Cylindrical Source Model 5 |
| | 1.2.2.3 Eskilson’s Model 6 |
| | 1.2.2.4 Comparative Discussion . 8 |
| | 1.2.3 The GLHEPRO Software . 9 |
| | 1.2.4 The Water Loop Heat Pump System 12 |
| | 1.2.5 Water Loop Heat Pump System Model 14 |
| | 1.2.5.1 The Loop Model .14 |
| | 1.2.5.2 Heat Pump Model 15 |
| | 1.2.5.3 Central Plant 17 |
| | 1.2.6 Water Loop Heat Pump File Used in BLAST 17 |
| | 1.3 Objectives.18 |
| | 2 Methodology and Implementation 19 |
| | 2.1 Methodology 19 |
| | 2.2 Modifications in the BLAST and GLHEPRO Codes 22 |
| | 2.3 Testing the Modified Code 25 |
| | 2.3.1 BLAST input file WLHPTEST.blin . 25 |
| | 2.3.2 Discussion of the WLHPTEST results 26 |
| | 3 Results and Discussion 29 |
| | 3.1 Validation of Model 29 |
| | 3.1.1 The Building Model in BLAST . 29 |
| | 3.1.2 Validation of the Heat Pump Models 30 |
| | 3.1.2.1 Calculation of Heat Pump Performance Parameters . 31 |
| | 3.1.2.2 Comparing the Heat Pump Models of BLAST and GLHEPRO . 33 |
| | 3.1.3 Validation of the Water Loop Models 34 |
| | 3.2 Three Methods for Simulating Ground Loop Heat Pump Systems . 36 |
| | 3.2.1 Comparing the New Model of BLAST with the Model of GLHEPRO. 36 |
| | 3.2.2 Comparing the GLHEPRO Model with the Simple Constant Loads Model 38 |
| | 3.2.3 A Summary of All Three Methods of Simulation 40 |
| | 3.3 A Sample Problem 42 |
| | 3.3.1 The Design Process . 42 |
| | 3.3.1.1 Building Description in BLAST 44 |
| | 3.2.1.2 Water Loop Heat Pump Description in BLAST 47 |
| | 3.3.2.3 Ground Loop Heat Exchanger Description in GLHEPRO 54 |
| | 3.3.2 Results for a One Year Simulation . 57 |
| | 3.3.3 Studying Long Term Effects 60 |
| | 3.3.4 Comparing the New BLAST Model Results with the Results from the Simple Constant Loads |
| | Model . 62 |
| | 3.3.5 Comparing the Ground Loop System with a Dual Duct VAV System. 63 |
| | 4 Conclusions and Recommendations . 68 |
| | 4.1 Summary and Conclusions 68 |
| | 4.2 Recommendations . 69 |
| | References . 71 |
| | APPENDIXES 72 |
| | APPENDIX A. - STRUCTURAL DETAILS OF THE WATER LOOP HEAT PUMP SYSTEM |
| | SUBROUTINE .73 |
| | APPENDIX B. - DETAILED EXPLANATION OF ALL CHANGES MADE IN THE CODE 86 |
| | APPENDIX C - A SUMMARY OF THE MANUAL ITERATIONS PERFORMED TO TEST THE |
| | METHODOLOGY 108 |
| | APPENDIX D.1 INPUT AND OUTPUT FILES OF THE INSULATED ONE ZONE BUILDING . 113 |
| | APPENDIX D.2 CALCULATING BLAST HEAT PUMP PERFORMANCE COEFFICIENTS 128 |
| | APPENDIX D.3 COMPARING BLAST AND GLHEPRO WATER LOOP AND HEAT PUMP MODELS |
| | 130 |
| | APPENDIX E.1 COPY OF ONE OF THE DAYCARE CENTER BLUE PRINTS 133 |
| | APPENDIX E.2 BLAST INPUT FILE OF THE DAYCARE CENTER 135 |
| | APPENDIX E.3 TABLES OF THE DAYCARE CENTER LOADS ON THE HEAT PUMPS . 146 |
| | APPENDIX E.4 PSYCHROMETRIC CHARTS USED IN THE SELECTION OF THE DAYCARE |
| | CENTER HEAT PUMPS . 156 |
| | APPENDIX E.5 BLAST OUTPUT FILE OF THE DAYCARE CENTER USING THE ORIGINAL CODE |
| | 161 |
| | APPENDIX E.6 GLHEPRO INPUT FILE FOR THE DAYCARE CENTER 180 |
| | APPENDIX E.7 BLAST AND GLHEPRO OUTPUT FILES FOR THE DAYCARE CENTER FOR A |
| | TEN YEAR SIMULATION USING THE MODIFIED CODE 183 |