110年 - 110 國立中央大學_碩士班招生考試_能源工程研究所/不分組(一般生):基礎熱力學#103858

1. (5 %) Describe an imaginary process that satisfies the first law but violates the second law of thermodynamics.

(a) Find the COP of a refrigerator that removes heat from the food compartment at a rate of 5040 K/h per kW of power consumption. Also, find the rate of heat rejection to the kitchen.

(4%) (b) The temperature of outside air, the kitchen and the food compartment is 35℃, 27℃ and 7℃, respectively. What is the maximum COP of this refrigerator?

3. (6 %) Does a cycle for whichviolate the Clausis inequality? Why?

4. (8%) Write and explain the expression relates the entropy generation and exergy destruction.

5. (15%) Describe the thermodynamic principles with its four fundamental components for the air- conditioner. List any three types of air-conditioner which is operated in different thermodynamic cycle.

6. (8 %) Explain the difference between heat pump and heat engine.

(a) a simple ideal steam Rankine cycle,

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

8. (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?

9.(15%)台電大潭電廠採用複循環發電機組複循環發電機組有何優點?什麼?

110年 - 110 國立中央大學_碩士班招生考試_能源工程研究所/不分組(一般生):基礎熱力學#103858

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