Perform the energy and entropy balances

Assignment Help Chemical Engineering

Reference no: EM131155969

Example 6.23: Liquefaction of Nitrogen

Nitrogen is liquefied in the process shown in Figure 6-16. Nitrogen gas is fed at 25 °C, 1 bar (stream 1). The gas is compressed to 180 bar in a compressor with an efficiency of 85%. The precooler uses ambient water as the cooling medium and cools the nitrogen to 30 °C. The precooler uses cold vapor from the separator as the cooling medium; this vapor leaves the precooler at 20 °C (stream). Perform the energy and entropy balances on the basis of 1 kg/s of liquid nitrogen produced.

Reference no: EM131155969

Questions Cloud

What is the temperature of the exit stream : She believes she can extract 1700 kW of work and 220 kW of heat that will be used to boil water at 1 bar. Her process, whose details are yet to be determined, will receive streams A and B as inlet and will have a single outlet stream that will be ..

What is the implied discount rate : If the future value of an annuity due is $25,000 and $24,000 is the future value of an ordinary annuity that is otherwise similar to the annuity due, what is the implied discount rate?

Determine the heat load and the entropy generation : The steam in the previous example is cooled using water at 1 bar, 25 °C. The cooling water emerges at 40 °C at the exit of the heat exchanger. Determine the heat load and the entropy generation. Compare the result with the previous example.

Calculate the present value : calculate the present value of this security. Use the constant growth model to find the stock value.- Determine the value of the stock using the new dividend and required return from part b.

Perform the energy and entropy balances : The precooler uses cold vapor from the separator as the cooling medium; this vapor leaves the precooler at 20 °C (stream). Perform the energy and entropy balances on the basis of 1 kg/s of liquid nitrogen produced.

Estimate the maximum coefficient of performance : Design a vapor compression cycle using ammonia as the refrigerant that will be used to maintain the temperature of a stream at - 20 °C. The evaporator is air cooled and the ambient temperature may be assumed to be 25 °C. Assume a compressor effici..

Determine which method is thermodynamically more efficient : In the process of Example 6.2, the flow rte of streams 1′ and 2′ is made very high, while the state of streams 1, 2, and 1′ are the same as in the previous example. Repeat the calculation of entropy generation for these new conditions.

Calculate the entropy of propane at its critical point : A member of our engineering team objects that the reference state is not valid because a substance is not ideal at the critical point. What is your response?

Draw an appropriate er diagram : Draw an appropriate ER diagram - Use the symbols as prescribed in your course-textbook to draw the ER diagram (ERD) for the above case study.

User Account

All Pages