本研究旨在探討冷凍室性能皆為四星級的定頻與變頻電冰箱在不同環境與使用行為下之冰箱性能與耗電特性。實驗於兩間配置相同空調系統之測試室中進行，透過變更環境溫度、有無室內熱源及太陽輻射、冰箱內部裝載量（無負載、半負載、全負載）、熱食置入溫度（55°C與25°C水）及機殼裝潢散熱距離等參數，深入剖析系統之壓縮機運轉模式、除霜週期、箱內溫度波動與能耗變化。
基準試驗結果顯示，在常態運轉下，變頻電冰箱之總耗電量較定頻電冰箱低約18.3%，其優勢在於變頻壓縮機能動態調節運轉功率，大幅減緩定頻壓縮機頻繁啟停所引發的能耗損失，且除霜觸發頻率未達定頻冰箱之一半。在外部環境方面，冰箱能耗與環境溫度呈高度正相關；當周圍有熱源時，定頻與變頻冰箱之能耗分別增加約10%與24%，顯示變頻冰箱對環境熱負荷更為敏感。此外，在強烈日照與無負載之極端耦合條件下，定頻冰箱會因運轉壓力比過高導致容積效率下降，進而引發壓縮機運行功率下降且箱內溫度持續攀升之特殊現象。
在冰箱內部負載(在冰箱內放置物品稱為負載)與使用行為方面，置入已預冷之負載對冰箱能耗影響不顯著，但因高熱容量扮演儲存冷度的角色，顯著縮小箱內溫差波動。相反地，若在冷藏室放入未放涼之熱食，會因需要使熱食與冷藏室溫度達成平衡，使能耗急劇攀升；實驗結果表明，置入55°C水相比於25°C水時，定頻能耗僅增加7%且冷卻時間延長，而變頻冰箱則因採取高功率全力運轉，導致總能耗大幅激增達33%。最後，在機殼散熱空間配置方面，發現在高度包覆、空氣不流通的嵌入式木作裝潢環境中，夾層內的空氣近乎靜止，使系統散熱機制由以傳導為主導；在此條件下，散熱間距愈短，散熱效果反而愈佳且愈省電。

This study aims to investigate the performance and power consumption characteristics of conventional and inverter refrigerators, both featuring four-star freezer ratings, under various environmental conditions and user behaviors. Experiments were conducted in two identical testing rooms equipped with the same air conditioning systems. The effects of ambient temperature, indoor heat sources, solar radiation, basic loading conditions (no loading, half loading, and full loading), interior thermal loading (55°C and 25°C water), and cabinet heat dissipation distances on compressor operation, defrost cycles, interior compartment temperatures, and energy consumption were systematically investigated.
Baseline test results indicate that under normal operation, the total energy consumption of the inverter refrigerator is approximately 18.3% lower than that of the conventional refrigerator. This advantage stems from the ability of the inverter compressor to dynamically adjust its operating power, which significantly mitigates the energy losses caused by the frequent on-off cycling of conventional compressors; furthermore, the defrost frequency of the inverter refrigerator is less than half that of the conventional refrigerator. Regarding the external environment, refrigerator energy consumption is strongly positively correlated with ambient temperature. In the presence of an indoor heat source, the energy consumption of the conventional and inverter refrigerators increases by approximately 10% and 24%, respectively, demonstrating that inverter refrigerators are more sensitive to environmental thermal loads. Moreover, under the extreme coupled conditions of intense solar radiation and no loading, the conventional refrigerator experiences a reduction in volumetric efficiency due to an excessively high operating pressure ratio, leading to a unique phenomenon where the compressor operating power drops while the interior compartment temperature continuously rises.
In terms of internal loading and user behavior, inserting pre-cooled loads has a negligible impact on energy consumption; however, due to their high heat capacity, these loads act as a cold storage buffer, significantly reducing interior temperature fluctuations. Conversely, placing hot food into the refrigerator compartment causes a sharp increase in energy consumption as thermal equilibrium must be established between the food and the compartment air. Experimental results reveal that compared with the insertion of 25°C water, the insertion of 55°C water, the conventional refrigerator's energy consumption increases by only 7%, albeit with a prolonged cooling time, whereas the inverter refrigerator operates at full capacity with high power, resulting in a dramatic surge in total energy consumption by up to 33%. Lastly, regarding spatial configurations for cabinet heat dissipation, the air within the interstitial enclosure remains nearly stagnant in a highly enclosed, unventilated built-in cabinetry environment, rendering conduction the dominant heat dissipation mechanism. Under this specific boundary condition, a shorter heat dissipation distance surprisingly yields better cooling effects and higher energy efficiency.

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