Throttling of saturated liquid If it is a saturated mixture, find the quality as well. In the question that follows, select the answer that is closest to the true value. The pressure of the fluid leaving the valve is P=0. This is because the throttling process involves maintaining constant enthalpy, and at 400 kPa, the refrigerant is in a saturated state. The temperature and pressure of the steam after throttling, as it exits the calorimeter, are 150\deg C and100 kPa, respectively. Determine (solution process required!) a) simplified energy equation (3 pts) b) water temperature T2, vapor quality X2 and specific volume v2 at state 2 (6 pts) c) rate of total entropy generation Question: Problem 05. Steam flows through a well-insulated piston-cylinder device that initially contains 5 kg of saturated liquid water at a pressure of 800 kPa. Determine the temperature and internal energy changes across the valve during steady operation. 18 B) 0. The mixture enters a separation vessel, where the liquid phase is gravitationally collected at the bottom and withdrawn, whereas the vapor occupies the space above the liquid. During throttling, enthalpy remains constant. It is throttled steadily and adiabatically to 2. Saturated liquid Refrigerant 134a enters the valve at a pressure of 9 bar and is throttled to a pres- sure of 2 bar. Determine the temperature drop [°C] during this process and the final specific volume [m3/kg) of the refrigerant. What is the quality of the saturated liquid-vapor water at the exit of the throttling valve? Answers (to choose from): A) 0. In this case, a reduction in pressure causes an increase in vapor quality. Mar 10, 2023 · In a single-flash geothermal power plant, geothermal water enters the flash chamber (a throttling valve) at 230°C as a saturated liquid at a rate of 50 kg/s. 067 SI The figure below provides steady-state data for a throttling valve in series with a heat exchanger. Throttling Valve Upstream Conditions Saturated Liquid Water at 225°C P Control volume Saturated liquid H20 enters a throttling valve at a temperature of T1 = 225 °C. In each case, the fluid entering the throttle is H₂O at 15 bar, and the exit pressure is 1. 96 Figure P4. The measurements needed to obtain a steam quality measurement are temperature, pressure, and entrained liquid content. Determine the temperature drop during this process and the final specific volume of the refrigerant. Determine temperatures T 1 and T 2. Water enters a throttling valve as saturated liquid at 800 psia. Suppose you are an engineer who invents a special turbine that can take in R-134a as a saturated liquid, and the R-134a leaves Feb 16, 2024 · In summary, the consequences of a throttling process on both a saturated liquid and an ideal gas are a decrease in enthalpy and temperature. Draw T-v diagram and show state 1 and state 2 on this diagram. The saturation temperature at this pressure indicates that the refrigerant will have vaporized to a significant degree. A low-quality liquid vapor mixture results after the throttling process. The figure below provides steady-state data for a throttling valve in series with a heat exchanger. Nov 16, 2019 · 4. However, for an ideal gas, the decrease in enthalpy is primarily due to the decrease in temperature, while for a saturated liquid, the decrease in enthalpy is a result of the expansion of the liquid. This process is one of the simplest unit operations. 1 depicts the description of this process. A high percentage (88% or more) of industrial steam systems use saturated steam for process applications. A saturated liquid-vapor mixture of water, called wet steam, in a steam line at 1650 kPa is throttled to 50 kPa and 100°C. a) (7 pts) Find the temperature at the exit of the throttling valve. Now, my confusion stems from the throttle. Steam 50 kPa 1. This restriction is commonly done by means of a partially open valve or a porous plug. 8 bar. If the exit from the throttle is a liquid-vapor mixture, determine the 4. Determine the temperature drop [ °F ] during this process and the final specific volume ft³/lbm The throttle process is approximated as a constant enthalpy process. Throttling Dec 15, 2021 · Although expansion through a throttling device is inherently non-isentropic, expansion through a turbine would also be ine cient and produce little power due to the low quality of the saturated vapor-liquid mixture and, thus, low specific enthalpies. It then enters a heat exchanger and exits as saturated vapor at 4°C (State 3) from the heat exchanger. Figure Q3. Water at high pressure expands adiabatically to a lower pressure (throttled) through a partially-closed valve. 1 kg/s a. May 31, 2023 · After throttling saturated liquid R-410A from 25°C to 400 kPa, the exit temperature is approximately 45. (d) Draw a T-v diagram Refrigerant-134a is throttled from the saturated liquid state at 700 kPa to a pressure of 157. 26 kg / s and is throttled to T_2=-8^∘C The refrigerant then enters the heat exchanger, exiting as saturated vapor with no Question: The figure below provides steady-state data for a throttling valve in series with a heat exchanger. The inlet properties ($h_1, T_1, v_1$) can be determined from the specified inlet conditions of saturated liquid propane at 18 bar. If the same process happens in an ideal gas then same h gives the same temperature h a function of T only at the lower pressure. To find this quality, one must typically refer to thermodynamic tables or use the Clausius-Clapeyron equation to calculate properties at given pressures and temperatures. In case of wet steam, the actual enthalpy can be calculated with the vapor quality, x, and the specific enthalpies of saturated liquid water and dry steam: Nov 5, 2023 · Consider several different throttling processes. The steam resulting from the flashing process enters a turbine and leaves at 20kPa with a moisture content of 5 percent. Question: Saturated liquid-vapor mixture of water, called wet steam, in a steam line at 1500 kPa is throttled to 50 kPa and 100°C. Saturated liquid is defined as a state of a liquid at which it is in equilibrium with its vapor, characterized by a specific density that can be computed using potential models for various hydrocarbons, and compared with empirical data from correlation sources. Note that this is a variation on the calculation done in HW 4. Changing the state from saturated liquid to a lower pressure with the same h gives a two-phase state so some of the liquid will vaporize and it becomes colder. Question: 1. (Answer upto one decimal) Asked Feb 8 at 05:25 Helpful Report Saturated liquid water enters a steady-state, adiabatic throttling valve at T=100∘C. The flow rate is 0. Saturated liquid Refrigerant 134 a enters the valve at T_1=36^∘C with a mass flow rate of 0. 1 MPa. The steam resulting from the flashing process enters a turbine and leaves at 20 kPa with a moisture content of 5 percent. 4. Determine the quality at the exit. May 22, 2019 · The specific enthalpy of saturated liquid water (x=0) and dry steam (x=1) can be picked from steam tables. (a) Determine the temperature drop during this process and the final specific volume of the refrigerant Question: The figure below provides steady-state data for a throttling valve in series with a heat exchanger. If the throttling valve or device is located at the entry into a pressure vessel so that the flash evaporation occurs within the vessel, then Consider two vapor-compression refrigeration cycles. What is the quality in the steam line? In a single-flash geothermal power plant, geothermal water enters the flash chamber (a throttling valve) at 230 ^\circ {} ∘ C as a saturated liquid at a rate of 50 kg/s. [1][2] If the saturated liquid is a single-component liquid (for example, propane or liquid ammonia), a part of the liquid immediately "flashes" into vapor. Find step-by-step Engineering solutions and the answer to the textbook question Figure provides steady-state data for a throttling valve in series with a heat exchanger. Refrigerant-134a is throttled from the saturated liquid state at 700 kPa to a pressure of 160 kPa. exiting at a temperature of 10∘C with no significant decrease in pressure. Determine the temperature of the steam after the flashing process and the power output from the turbine if Question: Refrigerant-134a enters the throttling valve of a refrigeration system at 120 psia as a saturated liquid and leaves at 20 psia. (a) Draw a sketch of the process and clearly indicate the control volume (b) Determine the temperature change (°F) across the valve. 3 kPa). The power output from the turbine if the Mar 19, 2020 · Refrigerant-134a is throttled from the saturated liquid state at 700 kPa to a pressure of 132. In a separate stream, liquid water at 1 bar enters the Question: Problem #3The throttling valve is a source of inefficiency in a refrigeration cycle, as it has a substantial decrease in temperature and pressure (and increase in entropy) with no power out. Saturated liquid Refrigerant 134a enters the valve at a pressure of 9 bar and is throttled to a pressure of p2=1 bar. If the throttling valve or device is located at the entry into a pressure vessel so that the flash evaporation occurs within the vessel, then the vessel is often referred to as a flash drum. Saturated liquid Refrigerant 134 a enters the valve at a pressure of 9 bar and is throttled to a pressure of p2 = 3 bar. Question: Refrigerant-134a enters the expansion (throttling) valve of a refrigeration system at 120 psia as a saturated liquid and leaves at 20 psia. The expansion valve expands the substance to a pressure of 140 kPa. Saturated liquid Refrigerant 134a enters the valve at a pressure of 9 bar and is throttled to a pressure of P2 = 3 bar. Assuming no heat loss across the throttling valve, determine: R-134a = 900 kPa T3 35. Saturated liquid Refrigerant 134a enters the valve at a pressure of 9 bar and is throttled to a pressure of 2 bar. This compressed refrigerant enter a condenser where it rejects heat to the ambient atmosphere and leaves as a saturated liquid at high pressure at state 3. B) The temperature drop during this process. Determine the temperature of the steam after Applications of Throttling (a) Refrigeration The working fluid (called refrigerant) leaving the evaporator as vapour at state 1 under goes an adiabatic compression in a compressor and leaves as saturated vapour at state 2. Question: Saturated liquid-vapor mixture of water, called wet steam, in a steam line at 2,000 kPa is throttled to 100 kPa and 120 degree C. Neglect KE and PE effects. In each case, the fluid entering the throttle is H2O at 5 bar and the exit pressure is 1 bar. 5 MPa 100°C Refrigerant -134 a is throttle from the saturated liquid state at 700 kPa to a pressure of 160 kPa. The refrigerant enters the throttling valve as a saturated liquid, and leaves as a saturated mixture. 5 bar. 96Figure P4. 25 C) 0. 5 MPa FIGURE P5-63 5-72 In steam power plants, open feedwater heaters are frequently utilized to heat the feedwater by mixing it with steam bled off the turbine at Feb 8, 2025 · Question Saturated liquid at a high pressure P1 having enthalpy of saturated liquid 1000 kJ/kg is throttled to a lower pressure P2. However, as the pressure drops some of the liquid in the saturated steam vaporizes and increases the steam quality (i. Jan 31, 2015 · Throttling steam from 230 PSI to 170 PSI can lead to a temperature drop that may not reach the saturation temperature due to the flashing of moisture in the steam. A throttling process is a thermodynamic process in which the enthalpy of the gas remains constant. Jul 21, 2008 · The drum attached to the throttle then provides the space for the vapor and liquid to separate from each other, where the liquid travels downward and the vapor upward. 2 x2 = ? Determine the change in entropy across the throttling valve. Throttling of the wet steam is also associated with the conservation of enthalpy. What are the inlet and exit temperatures, in °C? b. The temperature drop and final specific volume can be accurately determined by equating the previouosly known enthalpy at the beginning state (saturated liquid at 700kPa) with the final state. What is the quality in the steam line? HW\#4-4 A saturated liquid-vapor mixture of water, called wet steam, in a steam line at 2MPa is throttled to 100kPa and 125∘C. 2 MPa and 200 °C through an upstream throttling valve that reduces its pressure to 800 kPa. The refrigerant enters the throttling valve as a saturated liquid at 30 degree C in one cycle and as subcooled liquid at 30 degree C in the other one. Suppose you are an engineer who invents a special turbine that can take in R-134a as a saturated liquid, and the R-134a leaves as a saturated liquid + vapor mixture. The refrigerant then enters the heat exchanger, exiting at a temperature of 10°C with no significant decrease in pressure. 944 Throttling valve 50 kPa , 100°C Steam 1. 30 D) 0. a) Find the temperature (T 1), specific enthalpy (h1) and quality (x1 ) before the valve. What is the quality in the steam line? Answer: 0. Determine:A) The quality of the Refrigerant before throttling. Jun 5, 2006 · Taking into account this fact, the saturated liquid–vapor mixture is flown through a valve in the throttling calorimeter. ) pts) Find the change in entropy during this process. This is a typical result for a throttling valve where the inlet and outlet enthalpies are approximately the same. Saturated liquid Refrigerant 134a enters the valve at a pressure of 900 kPa and is throttled to a pressure of 200 kPa. Applying the first law to the throttling valve, the enthalpy at the exit, h2, in kJ/kg is Refrigerant R-134a enters a throttling valve as a saturated liquid at P1=800 kPa. Dec 7, 2023 · Solution For Refrigerant-134a is throttled from the saturated liquid state at 700 kPa to a pressure of 160 kPa. Jun 7, 2023 · A saturated liquid-vapor mixture of water, called wet steam, in a steam line at 1500 kPa is throttled to 50 kPa and 100°C. What is the quality in the steam line? x = ___________ Question: Figure provides steady-state data for a throttling valve in series with a heat exchanger. Saturated steam (meaning steam that is A flow of 0. b) How much does the water specific volume increase the throttling process? 2. After exiting the valve, steam is then cooled down to saturated liquid at 70 °C using a heat exchanger. In a single-flash geothermal power plant, geothermal water enters the flash chamber (a throttling valve) at 230 ∘ ∘ C as a saturated liquid at a rate of 50 kg/s. Saturated liquid of water enters a throttling valve as state 1. A throttling valve is used to reduce the pressure in a steam line from 1 MPa to 100 kPa. However, since the throttling process is an isenthalpic process (i. If the inlet state is saturated liquid, determine the exit quality. If the water is a liquid Saturated liquid water at p1 = 800 psia is expanded in a throttling valve to a saturated mixture at p2 = 90 psia. The refrigerant then enters a heat exchanger where it exits as saturated vapor with no significant decrease in its pressure. A Saturated liquid at high-pressure P1 having an enthalpy of saturated liquid 1000 kJ/kg, is throttled to a lower pressure P2. What is the rate of entropy generation for this throttling process in kW/K? What is the quality of the saturated liquid-vapor water at the exit of the throttling valve? Answers (to choose from): A) 0. Saturated liquid Refrigerant 134a enters the valve at a pressure of 9 bar and is throttled to a pressure of p 2 = 2 bar. Then the liquid Aug 21, 2020 · A saturated liquid is a fluid that is on the verge of vaporization, meaning it is at the boiling point corresponding to its pressure. In a single-flash geothermal power plant, geothermal water enter the flash chamber (a throttling valve) at 230 degree C as a saturated liquid at a rate of 50 kg/s. The enthalpy of substance water at the exit of the throttling valve is h 2 = 340. b. It then enters a heat exchanger and exits as saturated vapor at 4∘C (State 3) from the heat exchanger. EXCERSISE 5-63 Saturated liquid-vapor mixture of water, called wet steam, in a steam line at 1500 kPa is throttled to 50 kPa and 100°C. When a saturated liquid is throttled, the drop in pressure while maintaining constant enthalpy can move the fluid into a subcooled (compressed liquid) state rather than initiating vaporization, due to the removal In thermodynamics, the Joule–Thomson effect (also known as the Joule–Kelvin effect or Kelvin–Joule effect) describes the temperature change of a real gas or liquid (as differentiated from an ideal gas) when it is expanding; typically caused by the pressure loss from flow through a valve or porous plug while keeping it insulated so that no heat is exchanged with the environment. Determine (a) the temperature drop across the throttling valve and (b) the entropy generation and the exergy destruction during this process. The lines bordering the vapor dome are called saturated liquid and saturated vapor lines. Determine (a) the inlet temperature (°C), (b) the outlet temperature (°C), and (c) outlet enthalpy (kJ/kg) value. 67 WP Figure P4. Feb 13, 2024 · Pure Substances S K Mondal's Chapter 7 166 p-v-T Surface T-s Diagram for a Pure Substance Critical Point A state at which a phase change begins or ends is called a saturation state. The c. Find step-by-step Engineering solutions and the answer to the textbook question Saturated liquid-vapor mixture of water, called wet steam, in a steam line at $2000 \mathrm {~kPa}$ is throttled to $100 \mathrm {~kPa}$ and $120^ {\circ} \mathrm {C}$. Question: A Saturated liquid at high-pressure P1 having an enthalpy of saturated liquid 1000 kJ/kg, is throttled to a lower pressure P2. Question: Problem #3 (5 pts +1 pt extra credit)The throttling valve is theoretically a source of inefficiency in a refrigeration cycle, as it has a substantial decrease in temperature and pressure (and increase in entropy) with no power out. It has been suggested that perhaps it would make more sense to replace the valve with a turbine-the desired pressure drop will still occur, but some work would be obtained from the turbine. The refrigerant then enters the heat exchanger, exiting at a temperature of 10 degree C with no significant decrease in pressure. Throttling valves are an integral component in refrigeration and air conditioning cycles, see Chapter 11. You can vary the inlet temperature T 1 and outlet pressure P 2. Jun 9, 2023 · Water enters a throttling valve as a saturated liquid at 5 bar and exits as a two-phase mixture at 1 bar. A Question: The figure below provides steady-state data for a throttling valve in series with a heat exchanger. Which cycle do you think will have a higher COP? Figure P4. The dome shaped region composed of the two-phase liquid - vapor states is called the vapor dome. A throttling can be achieved simply by introducing a restriction into a line through which a gas or liquid flows. e. 5°C The enthalpy of the saturated mixture at the throttle exit, in kJ/kg. 5 kg/s of saturated liquid R-134a enters a steady-state adiabatic throttling valve at 10 bar. . Liquid ammonia is used the cooling agent enters the heat exchanger at 30 °C and leaves at 75 °C. 03. (c) Determine the internal energy change (Btu/ibm) across the valve. At pressure P2 enthalpy of saturated liquid and that of the saturated vapour are 800 and 2800 kJ/kg respectively. Assume the states of the condensate extracted from the turbine, before and after throttling, to be the same as that of the saturated liquid at the lower pressure of the throttled liquid. The piston moves freely such that constant pressure is maintained. (10 points) Question: 1. 2 Ti = 518°F P2 = 90 lbf/in. 82 kPa. 34 Water enters a throttling valve as saturated liquid at 400 psia. Use tables, but explain how you did the calculation. Consider R134a entering a throttle as a saturated liquid at 1 MPa and leaving the valve at 0. It exits at a pressure of 15 psia. Now suppose that the inlet state is saturated vapor. vapor fraction). What are the temperature drop, quality, and specific volume at the end of the throttling process? Question: Refrigerant-134a enters the throttling valve of a heat pump system at 200psia as a saturated liquid and leaves at 20 psia. The liquid refrigerant at pressure p3 = p2 and temperature T3 = T2, is expanded by throttling process through the expansion valve to a low pressure p4 = p1 and Temperature T4 = T1 as shown by the curve 3-4 on T-s diagram and by the vertical line 3-4 on p-h diagram. Use appropriate property tables as needed. Saturated liquid Refrigerant 134a enters the valve at T1 = 36 degrees Celsius with a mass flow rate of 0. Determine the temperature drop during this process and the final specific v A refrigeration system has a throttling device through which Refrigerant-134a is throttled from a saturated liquid state at 400°F to a pressure of 40°F. If entropy is generated, identify which type of Engineering Mechanical Engineering Mechanical Engineering questions and answers A saturated liquid-vapor mixture of Refrigerant R-134A in a pipeline at 1700 kPa is throttled to 60 kPa and \ ( 0^ {\circ} \mathrm {C} \). What are the inlet and exit temperatures, in °C? b. An insulated throttling calorimeter is attached to the pipe, and the steam is throttled to atmospheric pressure. The exit pressure is 1 bar. Saturated liquid Refrigerant 134a enters the valve at a pressure of 9 bar and is throttled to a pressure of P2 = 2 bar. Since the initial state is a saturated liquid at 700 kPa, and knowing the initial enthalpy, we can look up the properties of the saturated liquid at the initial pressure in a thermodynamic table for Refrigerant-134a. The steam resulting from the flashing process enters a turbine and leaves at 20 kPa with a moisture content of 5 percent. 67 provides steady-state data for a throttling valve in series with a heat exchanger. In a refrigeration system, R-134a enters an expansion valve (i. Saturated Liquid Valve Saturated Mixture 2 Pi = 800 lbf/in. Saturated liquid propane at 18 bar (State 1) steadily enters a throttling valve. What is the quality in the steam line? 5:44 A power plant uses an adiabatic single-flash process coupled with a liquid-vapor separator and a turbine Saturated liquid water enters the flash chamber (which behaves like a throttling valve) at 220 C at a rate of 63 kg/s and leaves at a pressure of 700 kPa The stream then enters the separator where the liquid is collected at the bottom of the unit while the vapor portion of the stream Question: The figure below provides steady-state data for a throttling valve in series with a heat exchanger. a. 38 kPa. 4kPa. What is the quality in the steam line?. 10 kg of water is supplied at 1. May 22, 2019 · A throttling can be achieved simply by introducing a restriction into a line through which a gas or liquid flows. The refrigerant then enters the heat exchanger, exiting as saturated Example: Saturated liquid refrigerant-134a enters the throttling device at 1 MPa and is exiting at a lower pressure of 0. The evaporator pressure for both cycles is the same. For ammonia that enters a valve at 7 bar as a saturated liquid, it means that we keep track of the energy it contains due to pressure and temperature. a throttling device) as a saturated liquid at 750 kPa. Flash (or partial) evaporation is the partial vaporization that occurs when a saturated liquid stream undergoes a reduction in pressure by passing through a throttling valve or other throttling device. The throttling valve is a source of inefficiency in a refrigeration cycle, as it has a substantial decrease in temperature and pressure (and increase in entropy) with no power out. 4 MPa), hf is the enthalpy of saturated liquid at the final pressure, and hfg is the enthalpy of vaporization at the final pressure. [1][2][3 In a single-flash geothermal power plant, geothermal water enters the flash chamber (a throttling valve) at 230∘C as a saturated liquid at a rate of 50 kg/s. The exit stream is a vapor-liquid mixture, and the outlet temperature is the saturation temperature at the outlet pressure. Flash evaporation (or partial evaporation) is the partial vapor that occurs when a saturated liquid stream undergoes a reduction in pressure by passing through a throttling valve or other throttling device. How you do this depends on the accuracy you desire and the thermodynamic data available. Assuming steady-state Dec 7, 2023 · In a single-flash geothermal power plant, geothermal water enters the flash chamber (a throttling valve) at 230°C as a saturated liquid at a rate of 50 kg/s. A saturated liquid-vapor mixture of water, called wet steam, in a steam line at 1450 kPa is throttled to 50 kPa and 100°C. In an ideal vapor-compression refrigeration cycle, the refrigerant enters the compressor as a saturated vapor and is cooled to the saturated liquid state in the condenser. The refrigerant then enters the heat exchanger, exiting at a temperature of 10o C with no significant decrease in pressure. 5°C a. At a pressure P2 enthalpy of saturated liquid and that of the saturated vapor are 800 kJ/kg and 2800 kJ/kg respectively. HW - 16Saturated liquid propane at an absolute pressure of 18bar (State 1) steadily enters a rigid, adiabatic throttlingvalve. In a single-flash geothermal power plant, geothermal water enters the flash chamber (a throttling valve) at 230 dgrees C as a saturated liquid at a rate of 50 kg/s. Saturated liquid Refrigerant 134a enters the valve at a pressure of 9 bar and is throttled to a pressure of p2 = 2 bar. In a separate stream, liquid water enters the heat exchanger at 20°C and it exits at 10°C. The lower temperature, lower pressure, higher quality steam contains the same enthalpy as the original steam. The steam enters the throttling valve at 200 °C. Refrigerant -134 a is throttle from the saturated liquid state at 700 kPa to a pressure of 160 kPa. If the pressure of the flowing stream is reduced sufficiently by the throttling valve, the stream would pass into the superheated vapor region at the exit of the throttling calorimeter. 54 kJ/kg and pressure P 2 =20 kPa. The refrigerant then enters the heat exchanger, exiting at a temperature of 10 ∘ C with no significant decrease in pressure. The equation x = (h2 - hf) / (hfg) is used, where h2 is the enthalpy at the final pressure (0. Figure P4. Nov 5, 2023 · Consider several different throttling processes. A throttling process is defined as a process in which there is no change in enthalpy from state one to state two, h1 = h2; no work is done, W = 0; and the process is adiabatic, Q = 0. Question: In a single-flash geothermal power plant, geothermal water enters the flash chamber (a throttling valve) at 230oC as a saturated liquid at a rate of 52 kg/s. 1- The Figure below provides steady-state data for a throttling valve in series with a heat exchanger. Determine: The temperature of the steam after the flashing process. R-134a enters the throttle of an air conditioning system at 12 bar and as a saturated liquid. 00 MPa. Question: Refrigerant-12 enters the throttling valve of a heat pump system at 200 psia as a saturated liquid and leaves at 20 psia. The dryness fraction of vapour after throttling process is _________. 5-63 A saturated liquid-vapor mixture of water, called wet 15 steam, in a steam line at 1500 kPa is throttled to 50 kPa and m 100°C. The steam resulting from the flashing process enters a turbine and leaves at 20 kPa with a moisture content of 5%. Sep 23, 2024 · One way or another, you are going to have to be able to express the enthalpy as a function of temperature and pressure that is consistent mathematically for compressed liquid, saturated liquid, saturated vapor, and superheated vapor. What is the quality in the steam line? A saturated liquid-vapor mixture of propane at 4°C (State 2) exits from the throttling valve. , occurs at Oct 19, 2015 · The pressure drops across the throttle, and the saturation temperature is lower at the lower pressure. May 22, 2019 · Isenthalpic Process A throttling of the flow causes significant reduction in pressure, becauses a throttling device causes a local pressure loss. Thank you. 066 - Throttling processRefrigerant-134a is throttled from the saturated liquid state at 700kPa to a pressure of 185. Heat transfer, KE and PE changes can be neglected. 4 MPa can be determined using the throttling process. A saturated liquid-vapor mixture of propane at 4°C (State 2) exits from the throttling valve, thenenters a heat exchanger, and exits as saturated vapor at 4°C (State 3) from the heat exchanger. Refrigerant 134a is throttled from a saturated liquid at 70F to a saturated liquid-vapor mixture at 36. Determine exit temperature and quality of the refrigerant. Water exits the valve at P2 = 2 bar. If the inlet state is saturated vapor, determine the exit temperature if the water is superheated. It is then throttled to the evaporator pressure and vaporizes as it absorbs heat from the refrigerated space. Find the following: 1. Jan 4, 2025 · Consider several different throttling processes. At the top of the dome Question: (10 pts) In a single-flash geothermal power plant, geothermal water enters the flash chamber (a throttling valve) at 230 °C as a saturated liquid at a rate of 50 kg/s. 96 provides steady-state data for a throttling valve in series with a heat exchanger. The refrigerant then enters the heat exchanger, exiting at a temperature of 10 degree C with no significant decrease in pressures. 2 MPa. Pressure: P = kPa Enthalpy: h = kJ/kg 2. R-134a enters an ideal throttling valve (steady-state, adiabatic) as a saturated liquid at 20°C, and leaves the throttling valve at atmospheric pressure (101. Determine (a) the temperature drop across the throttling valve. Determine the temperature drop during this process. Problem 2, A throttling valve in a refrigerator is use to reduce the pressure of Refrigerant 134a from 900 kPa to 200 kPa. What ie the quality in the steam line? Throttling valve what is a) upstream velocity b) upstram temperature. Saturated liquid Refrigerant-134a enters a throttling valve at 36°C with a mass flow rate of 0. In addition, a turbine is Mar 11, 2020 · The quality of a saturated liquid-vapor mixture, also known as wet steam, indicates the proportion of the mixture that is in the vapor phase. 26 kg/s and is throttled to T2 = -8 degrees Celsius. The Pressure and Enthalpy at the upstream side of the valve. 35 kg/s. 26 kg/s, and it exits with a lower temperature at -8°C. It exits at a pressure of 15 psia, In the question that follows, select the answer that is closest to the true value. Nov 1, 2019 · For a throttling process, the enthalpy before and after the process is the same (H1=H2). The throttling process can be taken to be isenthalpic. 8°C. Suppose you are an engineer who invents a special turbine that can take in R-134a as a saturated liquid, and the R-134a leaves as a saturated liquid + vapor mixture. A throttling process is one of the isenthalpic processes. Assuming no heat loss across the throttling valve, determine: R-134a P 900 kPa 73 35. The process can be isenthalpic, isothermal or isentropic, with isenthalpic being the most common. A saturated liquid-vapor mixture of propane at 4∘C (State 2) exits from the throttling valve. What is the rate of entropy generation for this throttling process in kW/K? Sep 7, 2023 · The quality of the steam at 0. Question: A steam mixture consisting of saturated liquid and saturated vapor flows through a pipe at a ressure of 2. 1 psia. Objectives_template Module 6 : Lecture 31 : Refrigeration Cycle Sep 17, 2022 · Dear all, I would like know the logical reasoning for temperature reduction during throttling process of saturated and superheated steam eventhough its enthalpy, meaning total energy of the system is constant? What is the science behind it. Begin by determining the quality X2 of the steam at the throttle exit. Saturated liquid refrigerant R-134a is throttled from 750 to 60 kPa at a rate of 0. The dryness fraction of vapour after throttling process is _____. Nov 5, 2023 · The Refrigerant-134a in the question is going through a throttling process: an adiabatic process where we consider enthalpy constant. Find the rate at which entropy is generated in the throttling valve. Steady flow of saturated liquid water with mass rate = 2 kg/s and P1 = 10 bars enters a throttling valve. The refrigerant then enters the heat exchanger. Problem 4. Plugging the values into the equation, the quality of the steam is calculated to be 1.