【Mechanical Equipment Technology Edition】Daily Question 201807024: Refrigeration Systems—Case Analysis (1.2

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This post was last edited by YORK Industrial Refrigeration on 2018-7-30 at 15:21. This year’s 【Daily Question】 is divided into three categories: screw refrigeration compressors, refrigeration systems, and oil circuits, aiming to provide a comprehensive understanding of refrigeration technology. (If you encounter something you don’t know or can’t answer, please actively look up information; as you do so, your skills will improve!) ) All participants in the comments on this post will receive 1-3 wealth points; those who give complete answers will get 10-15 points, with the validity period being two days. Case analysis: Chiller – the temperature cannot be reduced during the day, and the outlet temperature of the chilled water is 16 degrees. At night, the temperature of the chilled water can be reduced to 8 degrees. It is known that the exhaust pressure limits the loading: 14.92 BAR (the loading is limited when the exhaust pressure reaches 14.92 BAR). During the day, the intake pressure is 6 bar while the exhaust pressure remains at 14.92 BAR; at night, the intake pressure is 4 bar with the exhaust pressure still at 14.92 BAR. All other parameters are normal. Question 2: When the exhaust pressure reaches 14.92 bar, limiting loading, is the load capacity higher during the day or at night? Based on the compression ratio, a higher compression ratio indicates a higher load capacity, while a lower compression ratio means a lower load capacity. At the same exhaust pressure, the load is greater during the day, resulting in a higher evaporation pressure. The compression ratio is equal to the exhaust pressure divided by the intake pressure; therefore, the load capacity is higher at night. https://attach01.hcbbs.com/forum/201807/23/163700ovfvwvvsv7sacydq.jpg