中高溫空氣源熱泵系統之性能分析

Performance Analysis for Moderately High-temperature Air-Source Heat Pump Systems

陳茁越(Juo-Yue Chen)

指導教授 ： 李宗興

國立臺北科技大學/機電學院/冷凍空調工程系所/碩士(2011年)

摘要

熱泵熱水器是一種從低溫處吸收能量，轉換成有用熱能的裝置。特色是節能、無汙染且運轉費用低。近年來國際間已經將研究重心移向中高溫熱泵和高溫熱泵。在日本的超級熱泵項目、美國IEA熱泵中心、IIR熱泵發展計畫以及歐洲大型熱泵研究計畫都是重點研究內容。如何提高熱泵出水溫度、提高效率與確保正常運作等各種研究項目就成為了此類設備開發的重要工作。本文目的為探討空氣源熱泵應用於中高溫熱泵系統之性能，利用理論模擬分析參數變化對系統製熱性能的影響，並以實驗數據進行理論模式之驗證。採用製熱能力、運轉耗電、製熱性能係數、壓縮機排氣溫度、冷凝器出水溫度和蒸發器出風溫度等指標進行模式驗證，所得到的誤差值加總取平均值約為2.0%。在熱水入水溫度25℃、出水溫度75℃的設計條件下，製熱能力為9.5RT(約33.4kW)。本次實驗中最高出水溫度可達到85℃，製熱性能係數為2.1。本文研究成果可作為中高溫熱泵系統設計與研究之參考。

關鍵字

空氣源熱泵 ； 中高溫熱泵 ； 熱泵熱水器 ； 性能係數

並列摘要

Heat pump water heater (HPWH) is a device that diverts heat from a source at a lower temperature to a heat sink at higher temperature using a small quantity of energy input (such as electricity). HPWH exhibits some advantageous characteristics such as low operating cost, minimal or zero contaminant produced and energy –saving potential.The focus of researches on HPWH in recent years has been shifted to the application of both moderately high temperature and high temperature heat pumps. For instances, the study of super heat pump in Japan and the researches on huge size heat pump in Europe, IIR and IEA in USA are the significant research works for the present.Therefore, the development of such devices with high supply water temperature, increased efficiency and optimum operation conditions is absolutely essential.This study is concerned with the performance of air-source type heat pump as moderately high temperature heat pump. To investigate the effects of operating parameters on the performance of heat transfer of heat pump system, the theoretical model was applied and the results were validated based on the experimental data. The operating factors of interest include heat generation, energy use during operation, heat transfer coefficient, temperature of discharge gas from compressor, temperature of supply chilled water and temperature of discharge air from the evaporator. The allowable average value of the accumulated errors based on the theoretical model is approximately 2.0%. With the design temperature of supply water at 25℃and the temperature of discharged water at 75℃, the capability of heat generating of the heat pump system is 9.5RT (approximately 33.4kW). The experiment recorded the highest temperature of discharge water at 85℃, the Coefficient of Performance is 2.1-2.5.The outcome of this study may be used as the reference for the research and system design of moderately high temperature heat pump in the future.

並列關鍵字

Air-source Heat Pump ； Moderately High-temperature Heat Pump ； Heat Pump Water Heater ； Coefficient of Performance

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