The refrigerant R-134a enters a throttling valve as a saturated liquid at 1600 kPa and leaves at 280 kPa. What is the temperature variation of R-134a? a) – 65.3 ºC B) – 60.4 ºC NS) – 56.6 ºC D) – 57.8 ºC TO) – 59.1 ºC

The refrigerant R-134a enters a throttling valve as a saturated liquid at 1600 kPa and leaves at 280 kPa. What is the temperature variation of R-134a? a) – 65.3 ºC B) – 60.4 ºC NS) – 56.6 ºC D) – 57.8 ºC TO) – 59.1 ºC

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

40 -

The refrigerant R-134a enters a throttling valve as a saturated liquid at 1600 kPa and leaves at 280 kPa. What is the temperature variation of R-134a?

– 65.3 ºC

– 60.4 ºC

NS)

– 56.6 ºC

– 57.8 ºC

TO)

– 59.1 ºC

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Step by step

Solved in 2 steps with 3 images

SEE SOLUTION Check out a sample Q&A here

Similar questions

7) Consider a cycle with n moles of diatomic gas illustrated in the PV diagram below. Assume the gas is ideal and that AB is an isotherm. a) Complete the chart below in terms of n, R, Temperature and Volume. b) Determine the efficiency. c) Find the Carnot efficiency for a cycle operating between these temperatures. P Isotherm B. C V V. AEint Qin WBy АВ BC СА cycle
In a certain semiconductor plant, the following condition exist on the intake side of thecompressor:Intake temperature - 28oCRelative humidity - 70%Volume of air drawn - 1,000 m3/hAfter compressing air to 7 bar, temperature rises to 40oC. Determine the following:a) Quantity of water before compressionb) Quantity of water after compressionc) Quantity of water occurring in the production aread) Total amount of water precipitated in the system
An oxygen gas R = 0.2598 KJ/kg°k and k = 1.395. If 4 kg of oxygen undergoes a reversible non-flow constant pressure process from initial volume =1.2 cubic meter and initial pressure = 690 kPa to a state where final temperature = 600°C. a.) What is the initial temperature? b.) Determine the constant volume specific heat. c.) Determine the Change in Internal Energy. d.) Determine the constant pressure specific heat. e.) Determine the Change in Enthalpy.
3. We have steam at 10 bar flowing in a line. We open a valve attached to the line and the steam comes out to 1 bar at 100 C. a) is this possible? b) What is the state of the steam in the line ...compressed liquid, saturated mix, superheated vapor?
A) Steam enters a turbine at a pressure of 30 bars, temperature of 400 degrees Celsius and exits at a pressure of 1bar. The turbine is isentropic, how much power is produced per unit mass flow rate, w. Their is no change in kinetic or potential energy and no heat transfer. Answer in kJ/kg B) Steam enters a turbine at a pressure of 30 bars, temperature of 400 degrees celsius and exits at a pressure of 1bar. If the turbine is operating at 95% isentropic efficiency, how much power is being produced per unit mass flow rate, w. Their is no change in kinetic or potential energy and no heat transfer. Answer in kJ/kg C) Steam enters a turbine at a pressure of 30 bars, temperature of 400 degrees celsius and exits at a pressure of 1 bar. If the turbine at 95% isentropic efficiency, what is the quality of the steam exiting the turbine? Their is no change in kinetic or potential energy and no heat transfer.
Determine the amount of work required to compressed 1.5 kg of air at a pressure of 7 barg. The isentropic index is 1.2 and the air intake is at 1 bar, 20C & RH =65%. i) Find the temperature at the end of the compression. ii) Represent the above process on a p‐v diagram. iii) If the isentropic efficiency is 65%, find the indicated or real work. iv) Find the shaft work needed if the mechanical efficiency is 75%.
At the beginning of the compression process of an air standard Otto cycle, p1 = 1 bar, T1 = 300 K. The maximum temperature in the cycle is 2250 K and the compression ratio is 9.8. The engine has 4 cylinders and an engine displacement of Vd = 2.1 L. Determine per cylinder: a) the volume per cylinder at state 1.b) the air mass per cycle.c) the heat addition per cycle, in kJ.d) the heat rejection per cycle, in kJ.e) the net work per cycle, in kJ.f) the thermal efficiency.g) the mean effective pressure, in bar.h) Develop a full exergy accounting per cycle, in kJ. Let T0 = 300 K, p0 = 1 bar.i) Devise and evaluate the exergetic efficiency for the cycle. Correct Answers for a, b, and c. v1= 0.585 L m = 0.000679 kg Qin = 0.942 KJPlease shows correct solutions. Thank you!
8 - Water vapor enters an adiabatic nozzle with a continuous flow at a temperature of 350ºC and a pressure of 4 MPa. What is the specific volume at the inlet? a) 0.06647 m³/kg B) 0.07343 m³/kg NS) 0.05842 m³/kg D) 0.05197 m³/kg TO) 0.05784 m³/kg
Turbine accepts water at 430 kPa, 200 C and enthalpy of 2859 kJ/kg. After expansion stage, the pressure, temperature and enthalpy values become 3 atm, 150 C and 2761 kJ/kg. If the turbine is well insulated, find the work output from it? A)130 kJ/kg B)128 kJ/kg C)240 kJ/kg D)98 kJ/kg E)78 kJ/kg
Water undergoes two processes in series: • 1 to 2: isentropic (internally reversible and adiabatic) compression from 0.1 MPa and the phase of water is “saturated vapor” to 0.5 MPa• 2 to 3: a reversible isothermal process to 1.5 MPaa) Draw the overall process on a T-s diagram. Clearly indicate all states and the values of the relevant intensive properties on your diagram. b) Is process 2 to 3 a compression, expansion, or isochoric process? How do you know? c) Determine the overall specific work (w13) and specific heat transfer (q13) for this complete process. (Hint: recall that Q int rev =∫ T ds21 for an internally reversible process between states 1 and 2.)
28 - The refrigerant 134a enters a throttling valve and releases 0.9 kJ/kg of heat to the environment at 287 K. What is the entropy change of the medium? a) 0.003461 kJ/kgK B) 0.001678 kJ/kgK NS) 0.003136 kJ/kgK D) 0.004092 kJ/kgK TO) 0.002581 kJ/kgK
The following data for the R-12 refrigeration system as shown are as follows: Evaporator 1 0 OC 30 TOR Evaporator 2 -10OC 20 TOR Evaporator 3 -20OC 10 TOR Condenser 20OC Assume simple saturation and isentropic compression and determine the following: a) Draw the h-s diagram b) The refrigerant flow in each evaporator c) Total work of compression, WC in kW d) Heat rejected in the condenser, QR in kj/min e) Coefficient of performance