THERMAL PERFORMANCE OF A GEOTHERMAL SOURCE HIGH-TEMPERATURE HEAT PUMP FOR DISTRICT HEATING - COMPARISON OF SINGLE-STAGE AND CASCADE VAPOR COMPRESSION CYCLES

被引:0
作者
Dickinson, Devon [1 ]
Mai, An [2 ]
Govedarica, Aleksandra [2 ]
Shor, Roman [2 ]
Mwesigye, Aggrey [1 ]
机构
[1] Univ Calgary, Schulich Sch Engn, Dept Mech & Mfg Engn, Calgary, AB T2N 1N4, Canada
[2] Univ Calgary, Schulich Sch Engn, Dept Chem & Petr Engn, Calgary, AB T2N 1N4, Canada
来源
PROCEEDINGS OF ASME 2023 INTERNATIONAL MECHANICAL ENGINEERING CONGRESS AND EXPOSITION, IMECE2023, VOL 7 | 2023年
基金
加拿大自然科学与工程研究理事会;
关键词
Coefficient of performance; District heating; Heat pump; Geothermal Energy; Global warming potential;
D O I
暂无
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
Reducing greenhouse gas emissions is of utmost importance in the race to keep the global average temperature increase to within 1.5 degrees C of pre-industrial levels to avoid catastrophic consequences of climate change. In cold climates, a large portion of carbon dioxide emissions come from the heating requirements of buildings, primarily space heating and hot water heating. Large institutional and commercial buildings use considerable amounts of energy to provide space heating and hot water, most of which comes from large-scale district heating systems powered by fossil fuels. There is therefore potential for emission reduction in institutional and commercial buildings using clean and renewable energy. This study investigates the use of high-temperature heat pumps in a high-temperature district heating system for a University Campus. The considered heat pump system meets 51 MWth of heating demand. The heat pump is coupled to a geothermal borehole 2 km in depth whose performance is modeled using CMG software for thermal reservoir modeling to improve its performance. The performance of the heat pump system using R134a is compared with that of environmentally friendly refrigerants, including R1233zd(E), R1366mzz( Z), R1234ze(Z), Butene, ammonia, R1224yd(Z), and RE245CB2. Results show that the cascade system yields higher average COPs regardless of the refrigerant due to lower compressor energy inputs. Results further show that using refrigerant R1233zd(E) in both system stages produces the best performance, with an average COP of approximately 3.0. Furthermore, for the building energy loads considered, high flow rates between 500 m(3)/h to 6000 m(3)/h are needed to meet the entire heating demand depending on the temperature difference between the inlet and outlet temperatures of the geothermal heat transfer fluid.
引用
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页数:9
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