- 學位論文
高溫熱泵系統之開發與研究
Development and Investigation of a High Temperature Heat-Pump System
摘要
本研究利用R-245fa冷媒應用在高溫熱泵系統之研究，其冷媒特性具有壓力低、無毒性、高製熱效率，可用來取代一般傳統瓦斯加熱或電熱水器設備，且高溫熱泵系統的製冷側與製熱側皆可拿來應用，使得能源效益上能夠大幅提升。 實驗部分係利用水路串疊的概念，將R-407C中溫熱泵與R-245fa高溫熱泵主機以二元方式做一結合。中溫熱泵以國家標準測試法進行測試分析，探討其水流量對於主機效果之影響，高溫熱泵則探討系統之冷媒充填量與膨脹閥之比較，最後再將兩台熱泵做二元結合，以探討其性能。實驗結果顯示，R-245fa於產生高溫低壓蒸氣時，其冷凝工作壓力約為12.5bar。當其冷凝溫度為110℃且熱水出水溫度為100℃時，使用感溫式膨脹閥其COPH為2.3，較定壓式膨脹閥提升4.8%；COPL為2.17，較定壓式膨脹閥提升14.2%。採用二元熱泵系統之節能效益，跟天然瓦斯相較之下可省60%，比液化瓦斯加熱省121.5%，比柴油鍋爐加熱省128.4%，比電熱器加熱省155.6%。
並列摘要
This article uses refrigerant of R-245fa to experimentally investigate the performance of the high temperature heat pump. R-245fa has the property of low pressure, no poison and high efficiency to generate the heat. Thus, R-245fa is very suitable with the application of high temperature heat pump with high operation efficiency. The experiment adopts the series of concept to combine the R-407C medium temperature and R-245a high temperature heat pumps for operations. The medium temperature portion uses the national standard test to investigate the performance with different water flow rates. The high temperature portion discusses the performance with different fill ratios of refrigerant and openings of expansion valve. The experimental data show that when the work pressure of the condensation is about 12.5bar, the high temperature and low pressure vapor of R-245fa is generated. As the condensation temperature is 110℃ and the outlet temperature of hot water is 100℃, the COPH of sensitive temperature type of expansion valve is 2.3 which is higher 4.8% than constant pressure type. COPL is 2.17 higher 14.2% than constant pressure type. This study adopts the cascade heat pump can have the great saving effect compared to natural gas of 60% saving, liquid gas of 121.5% saving, diesel oil boiler of 128.4% saving, and electric heating of 155.6% saving.