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METEO 300 Lecture Notes - Lecture 10: Specific Volume, National Institute Of Standards And Technology

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4 Jan 2018

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Me 300 - lecture 10 - properties of two-phase systems continued. Given water, you know that the pressure is 0. 1 mpa and the temperature is. Using the nist webbook or appendix from the textbook, you should find that water is a mixture in this example since the given temperature (372. 6 k) is equal to the saturation temperature (372. 76 k). We need another property in order to solve this problem. *note: when a substance undergoes a phase change, pressure and temperature become dependent on one another. Quality: represents the mass fraction of the vapor phase of a substance divided by the total mass. *note: the quality is not defined in the liquid and vapor phases and thus does not have a value when in those phases. Where is the volume of the saturated liquid found. The previous equation can be rearranged to obtain: : + (1 )

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Related Questions

steam tables can be found online.

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tables are in the link below:

https://cms.psu.edu/Spring2/201314SP/201314SPUP___RM_E__300_002/_assoc/5FAED765001F4138B07B0F0D0421F67A/Tables_D.pdf

A piston-cylinder device contains 0.8 kg of steam at 400K and 150 kPa. Steam is compressed at constant temperature until one-half of the mass condenses. Use the Problem Solving Method. Sketch the process on a T - nu diagram. Include the vapor dome and the constant pressure curves that pass through the initial and final states. Find the final pressure. Determine the initial and final volume. Determine the quality at the final state. A piston-cylinder device initially contains 50 L of liquid water at 300 K and 300 kPa. Heat is added to the water at constant pressure until the entire liquid is vaporized. (For a compressed liquid, use Vf and uf at the same temperature.) Use the Problem Solving Method. Show the process on a T - nu diagram with the vapor dome. Draw the constant pressure curve for 300 kPa from the compressed liquid region to the superheated vapor region. What is the mass of the water? What is the final temperature? What is the final volume? Determine the total change in internal energy Problem Solving Method Use the bold titles below as headings in your solutions. KNOWN: In your own words, briefly state the geometry and the given quantities of the problem. FIND: What is unknown that we are asked to find. SKETCH: Include a sketch for each problem. Also include a P-v, or T-s curve as appropriate. ASSUMPTIONS: These need to be justified if they are atypical. PROPERTIES: List the properties that were used and reference the table in which the values were found. For example: Superheated water, Table D.3I h(480K, 1.0MPa) = 2844.7 kJ/kg ANALYSIS: Solve the problem, step-by-step, and always include units. Give the final answer to four significant digits and box the final answer. DISCUSSION: Discuss your results. Are the results expected? Miscalculations can lead to unrealistic results. Indicate if you feel that your answer is not realistic. How do the results compare to other conditions such as standard atmospheric conditions, internal combustion engine or power plant.

Show transcribed image text A piston-cylinder device contains 0.8 kg of steam at 400K and 150 kPa. Steam is compressed at constant temperature until one-half of the mass condenses. Use the Problem Solving Method. Sketch the process on a T - nu diagram. Include the vapor dome and the constant pressure curves that pass through the initial and final states. Find the final pressure. Determine the initial and final volume. Determine the quality at the final state. A piston-cylinder device initially contains 50 L of liquid water at 300 K and 300 kPa. Heat is added to the water at constant pressure until the entire liquid is vaporized. (For a compressed liquid, use Vf and uf at the same temperature.) Use the Problem Solving Method. Show the process on a T - nu diagram with the vapor dome. Draw the constant pressure curve for 300 kPa from the compressed liquid region to the superheated vapor region. What is the mass of the water? What is the final temperature? What is the final volume? Determine the total change in internal energy Problem Solving Method Use the bold titles below as headings in your solutions. KNOWN: In your own words, briefly state the geometry and the given quantities of the problem. FIND: What is unknown that we are asked to find. SKETCH: Include a sketch for each problem. Also include a P-v, or T-s curve as appropriate. ASSUMPTIONS: These need to be justified if they are atypical. PROPERTIES: List the properties that were used and reference the table in which the values were found. For example: Superheated water, Table D.3I h(480K, 1.0MPa) = 2844.7 kJ/kg ANALYSIS: Solve the problem, step-by-step, and always include units. Give the final answer to four significant digits and box the final answer. DISCUSSION: Discuss your results. Are the results expected? Miscalculations can lead to unrealistic results. Indicate if you feel that your answer is not realistic. How do the results compare to other conditions such as standard atmospheric conditions, internal combustion engine or power plant.