110年 - 110 國立中央大學_碩士班招生考試_機械工程學系/熱流組(一般生):熱力學#103851

科目：研究所、轉學考(插大)◆熱力學 | 年份：110年 | 選擇題數：0 | 申論題數：12

試卷資訊

所屬科目：研究所、轉學考(插大)◆熱力學

選擇題 (0)

申論題 (12)

1. (6 %) Why are the temperature and pressure dependent properties in the saturated mixture region?

2. (6 %) The difference between the total energy for a flowing fluid system and a stationary (not flowing) system.

3. (6 %) Explain what is throttling valve and its major application in thermodynamic process.

4. (6%) What is the second-law efficiency? How does it differ from the first-law efficiency?

5. (6%) Consider a thermal energy reservoir at 1227*C that can supply heat at a rate of 150,000 kJ/h to an engine. Determine the maximum output power (in kW unit) of the engine, assuming an ambient temperature of 25C. Will higher temperature of heat source increase the maximum power?

6. (8 %) What is heat engine? Please explain its purpose, efficiency and give a sketch to show its operating character.

7. (6 %) Under what conditions is the ideal-gas assumption suitable for real gases?

8. (6 %) Write and explain the expression of energy balance, entropy balance and exergy balance for a closed system.

(a) a simple ideal steam Rankine cycle,

(12 %) (b) an ideal steam regenerative Rankine cycle with one open feedwater heater.

10. (15 %) Sketch schematic diagrams and accompanying T-s diagrams of a two-stage cascade refrigeration. What are the advantages of a cascade system over a single stage system?

11.(15%)請說明2種處理真實氣體混合物之方法