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Q1: From ESS, at P-8 Mpa at T-480°C h₁=3349.52 KJ/kg, S1-S2= 6.6610KJ/kg-K At condenser Pressure, P=.00 Mpa hf=173.85hfg=2403.1, Sg-8.2287, SF0.5926 Quality, x is given by S₂ - Sf Sa-Sr x = X= 6.6586 0.5926 8.2287 0.5926 x=0.7943 h2s hf+x*hfg=173.88+0.7943*2403.1=2083.37KJ/kg h₂=2083.37KJ/kg h3=173.85KJ/kg h4s-h3+0 (P1-P2)=173.88+ 1.0084 (8-.008)-181.91 KJ/kg h4=181.91 KJ/kg Condenser Pressure (KPa) 8 10 15 30 50 Wnet qin Wt (KJ/kg) Wp (KJ/kg) gout (KJ/kg) (KJ/kg) (KJ/kg) (KJ/kg) 1266.16 8.06 1258.10 3167.62 1909.52 1240.20 8.07 1232.12 3149.64 1917.52 1191.55 8.10 1183.45 3115.49 1932.04 1103.64 8.15 1095.49 3052.15 1956.66 1034.64 8.19 1026.46 3000.86 1974.41 efficiency (%) 39.72 39.12 37.99 35.89 34.21See Answer
Q2:3-10. One thousand cfm of air with a temperature of 100 F db and 10 percent relative humidity (RH) at a barometric pressure of 14.7 psia is humidified under adiabatic steady-flow conditions to 40 percent relative humidity with saturated vapor at 14.7 psia. Use the program PSYCH to find: (a) the final temperature of the air, (b) the mass of water vapor added to the air, and (c) the leaving volume flow rate. 80 Chapter 3 Moist Air Properties and Conditioning Processes 3-11. Air is cooled from 80 F db and 67 F wb until it is saturated at 55 F. Using Chart 1a, find (a) the moisture removed per pound of dry air, (b) the heat removed to condense the moisture, (c) the sensible heat removed, and (d) the total amount of heat removed.See Answer
Q3:Problem #2 Consider an ordinary shower where hot water at T₁ = 65 °C is mixed with cold water at T₂ = 5 °C. It is desired to steadily supply warm water at T3 for the daily use. Compute the outlet temperature T3 of the exit water from the mixing point if the ratio of the mass flow rates of the hot to cold water varies from 0.2 to 4 with an increment of 0.2. Plot the outlet temperature as a function of the mass ratio (of hot to cold water). Determine the most suitable mass ratio or range of the mass ratios, provide your justification. Hint: Assume the heat losses from the mixing chamber to be negligible and the mixing to take place at a constant pressure of 250 kPa.See Answer
Q4:Problem # 3 H A heat engine operates between a source at T₁ and a sink at T₁= 30°C. If heat is supplied to the heat engine (Q₁) at a steady rate of 20 kJ/s (kW), then study the effect of T₁ on the Carnot cycle thermal efficiency. T₁ varies from 300 to 1000°C. Plot the cycle H H efficiency versus T₁ and comment on the results. HSee Answer
Q5:Instructions by student: Need to do all the 4 task based on the file shared by student. Following are the tasks: 1) plot velocity vs. nozzel efficiency. 2) plot exit momentum as a function of efficiency for actual case. 3) do the calculations i sent above using the ees software to obtain we get the same answer. 4) must give the code used.See Answer
Q6:Problem #1 A 1 m³ tank contains 3.5 kg of steam (H₂O). 1) At pressure of 775 kPa, determine the temperature of the steam, using (a) the ideal gas equation, (b) the steam tables. Calculate the error percentage in using ideal gas assumption. 2) Determine the temperature in part (1) but now consider the pressures of 0.1 MPa and 1 MPa. Comment on the values.See Answer
Q7:Project 1: Design of a power plant Due date: Feb. 7 2024 Design alternatives are to be considered to provide 50MW of power for an industrial setup. For this purpose study various alternates e.g. Brayton Cycle, Rankine Cycle, Combined cycle, etc. considering minimization of Exergy loss as the objective function. Further access other advantages & disadvantages in relation to initial and operational costs for each alternative. Your report may also consider sensitivity analysis for various parameters (e.g. pressure ratio, Boiler/condenser pressure, highest cycle temperature etc.) for the selected system. Deliverables include: A report and a presentation of your findings and, picture/video clips of the design and selection process including the computer program/software. Your report must include a Title page, Contents, LOFigures and LOTables and References. All figures may be referenced in the text, and the computer program should be included in the appendix at the end of the report. In addition, the report may include summary, an introduction, design methodology, presentation and discussion of results and findings and a conclusion. 2015 Cengage Learning. All Rights Reserved./n (To decrease exergy destruction and maximize final power output) in power generation cycles such as Rankine and Brayton cycles, several strategies and methods can be employed. Here are some key approaches: Common Strategies: 1. Improving Component Efficiencies: 2. Optimizing Operating Parameters: ● 3. Enhancing Heat Recovery: ● Increase the efficiency of key components such as compressors, turbines, pumps, and heat exchangers to minimize energy losses. Specific to Brayton Cycle: 1 Combined Heat and Power (CHP) Systems: ● Adjust operating parameters, such as pressure ratios, temperatures, and mass flow rates, to find optimal conditions that reduce exergy destruction. Implement regenerative heat exchangers to recover more heat from the exhaust gases and use it to preheat incoming streams, improving overall system efficiency. 2 Intercooling and Reheating: ● Utilize the waste heat from the Brayton cycle for additional processes, such as heating or other industrial applications, to maximize overall system efficiency. ● Specific to Rankine Cycle: Implement intercooling between compressor stages and reheating between turbine stages to reduce irreversibilities and increase the overall efficiency. 1 Superheating and Reheating: Increase the temperature of steam entering the turbine through superheating and reheating, which improves the efficiency of the Rankine cycle. 2 Binary Cycle Systems: Implement binary cycles to capture additional power from low- temperature heat sources, increasing overall system efficiency. Advanced Strategies: 1 Advanced Materials and Coatings: Use advanced materials and coatings to improve heat transfer and reduce losses in high-temperature components. 2 Combined Cycle Configurations: ● Integrate both Rankine and Brayton cycles in a combined cycle configuration to utilize waste heat effectively and maximize overall efficiency. Parameter needed for analysis and their range Brayton Cycle: 1. Pressure Ratio (PR): Range: 5 to 30 Explanation: The ratio of the compressor outlet pressure to the inlet pressure. ● 2. Inlet Temperature (T1) or Highest Cycle Temperature: Range: 300 K to 2000 K ● ● 3. Isentropic Efficiency of the Compressor (n_c) and Turbine (n_t): Range: 0.7 to 1.0 ● ● ● 4. Specific Heat Ratio (y or k): Range: 1.1 to 1.4 ● Explanation: The temperature at the compressor inlet or the highest temperature in the cycle. Rankine Cycle: ● 1. Boiler Pressure (P1) and Condenser Pressure (P2): Range: 1 MPa to 30 MPa Explanation: Efficiency of the compressor and turbine in converting work. ● Explanation: The ratio of specific heat at constant pressure to specific heat at constant volume. ● 2. Boiler Temperature (T1) and Condenser Temperature (T2): Range: 300 K to 900 K ● Explanation: The pressure at the inlet of the turbine and the pressure at the condenser. 3. Isentropic Efficiency of the Pump (n_p) and Turbine (n_t): Range: 0.7 to 1.0 Explanation: Efficiency of the pump and turbine in converting work. Explanation: The temperature at the inlet of the turbine and the temperature at the condenser. 4. Specific Heat Ratio (y or k): Range: 1.1 to 1.4 Explanation: The ratio of specific heat at constant pressure to specific heat at constant volume. Common to Both: 1. Mass Flow Rate (m): ● ● 2. Regeneration Effectiveness (for Brayton): ● ● Range: Varies based on the system design. Explanation: The rate of mass flow through the cycle. 3. Cooling Medium Temperature (for Brayton): Range: 273 K to 350 K ● Range: 0 to 1 Explanation: Effectiveness of the heat exchanger in recovering heat from the turbine exhaust. ● Explanation: Temperature of the cooling medium in the heat exchanger. 4. Pump and Compressor Efficiency (n_pump, n_compressor): Range: 0.7 to 1.0 Explanation: Efficiency of the pump and compressor in converting work. It's essential to note that the specific ranges for these parameters can be highly dependent on the design constraints, the type of working fluid used, and other system-specific factors. Conducting sensitivity analyses with variations within these ranges will provide insights into the system's behavior under different conditions.See Answer
Q8:Problem HW2P2 Conditioned air at a temperature of 13 °C and a flow rate of 5000 L/s is supplied through a sheet metal duct to the zones in a commercial office building. The supply duct is rectangular in cross-section (300 mm x 600 mm), 500 m long, with an equivalent roughness of 0.0001 m. The sum of the fitting losses due to bends and dampers in the ductwork is equal to 800 hydraulic duct diameters. There is a cooling coil with a pressure drop of 150 Pa. The fan motor efficiency is 85 % and the fan efficiency is 75 %. Determine the motor power for the supply fan.See Answer
Q9: King Fahd University of Petroleum & Minerals MECHANICAL ENGINEERING DEPARTMENT ME 458 DESIGN OF THERMO-FLUID SYSTEMS Spring Semester 2023-2024 (232) Assignment #2 1. Benzene is used for the manufacture of detergent. A double pipe heat exchanger must be sized to exchange heat between benzene and water. The benzene flow rate is 1.26 kg/s, and it is to be heated from 23.9°C to 37.8°C. The water is available at 60°C. Select an appropriate heat exchanger and determine the required water flow rate. You must consider fouling affect such that the exchanger is to be cleaned on yearly basis. You need to provide a full report of your work including a Title page, Contents, list of figures and list of tables and References. All figures and references may be referred in the text, and the computer program should be included in the appendix at the end of the report. In addition, the report must include summary, an introduction, design methodology, presentation and discussion of results and findings and a conclusion.See Answer
Q10:1) Steam at 4 MPa and 400°C is throttled adiabatically to a pressure of 1 MPa. If the change in kinetic energy is negligible, find the specific volume of the steam after throttling.See Answer
Q11:2). Saturated mixture refrigerant 134a vapor at 40°C with a quality of 90% is condensed as it flows through a tube of 3 cm inner diameter and a velocity rate of 5.1 m/s. The condensate leaves the tube as saturated liquid at 40°C. Calculate the rate of heat transfer from the tube in kW.See Answer
Q12:Problem 1: Superheated water vapor at 1.4 MPa and 250 C is allowed to cool at constant volume until the temperature drops to 125 C. At the final state, determine (a) the pressure, (b) the quality, (c) the enthalpy. Problem 2: Complete the following table using the property tables for refrigerant-134a. Show the complete steps in finding the missing information of each state. If x is undefined, include that as a comment. T (°C) P (kPa) v (m³/kg) -4 320 10 0.0065 850 140 0.2 Problem 3: Diffuser x Phase Description Compressed Liquid Saturated Mixture Saturated Vapor Superheated Vapor V₂ << V₁ Calculate the velocity at the exit of a diffuser when air at 100 kPa and 30°C enters it with a velocity of 350 m/s and the exit state is 200 kPa and 90°C. Note: do not use the specific heat method - find the enthalpy directly from EES (the tutorial videos describe how to find the properties of each state).See Answer
Q13:1) Steam at 4 MPa and 400°C is throttled adiabatically to a pressure of 1 MPa. If the change in kinetic energy is negligible, find the specific volume of the steam after throttling. 2) Saturated mixture refrigerant 134a vapor at 40°C with a quality of 90% is condensed as it flows through a tube of 3 cm inner diameter and a velocity rate of 5.1 m/s. The condensate leaves the tube as saturated liquid at 40°C. Calculate the rate of heat transfer from the tube in kW. 3) A 1 m3 rigid, insulated tank that is initially evacuated is connected through a valve to a supply line that carries air at 200 kPa and 120 °C. Now the valve is opened, and air is allowed to flow into the tank until the pressure reaches 200 kPa, at which point the valve is closed. Determine: a. The flow work (i.e. Pv work) of the air in the supply line b. The final temperature of the air in the tank c. The mass of the air that entered the tank Air 200 kPa, 120°C Initially evacuatedSee Answer
Q14:AREN 4110/5110 BUILDING ENERGY SYSTEMS ENGINEERING Spring 2024 Problem HW3P5 In a VAV air conditioning system in a building, 80 L/s of outdoor air at 30 °C db and 15 °C wb is mixed with recirculation air at 24 °C and then enters a cooling coil. The air leaves the coil at 8 °C and 95 % RH. The zone sensible heat ratio is 8. Determine the circulation flow rate, zone humidity ratio, and (in kW) the total zone load, ventilation load, and coil load for the following sensible loads: a. 15 kW b. 10 kW Draw some conclusions from your results.See Answer
Q15:Google Chrome File Edit View History Bookmarks Profiles Tab Window Help HW4 CONVERTTEMP × M Instructions for using EES usi × Remote Des client.wvd.microsoft.com/arm/webclient/index.html Compute Enhanced x PE EES Academic Professional: C:\Users\maal5093\Downloads\hw 4 problem 3.EES File Edit Search Options Calculate Tables Plots Macros Windows Help Examples E Equations Window "Define constants and assumptions" People = 14 SensibleHeatPerPerson 100 "W" LatentHeatPerPerson = 70 "W" Computers =14 HeatPerComputer = 160 "W" VentilationRatePerPerson = 6" L/s per person" Outdoor conditions" OutdoorDBT 38 [C] OutdoorWBT 27 [C] "indoor conditions" IndoorTemp 25 [C] EE Debug Up Your problem definition is missing 3 equations that likely involve one or more of the variables I The problem seems to occur after block 0. Click Solve to solve though block 0. Click the left mouse button on a variable name to show where it is used in the Equations windo The Residuals or Computational Flow Window may also help to identify the problem. Variable CtoK DeltaEnthalpy Block 6 3 IndoorRH 50 [%] "Calculate total ventilation rate" TotalVentilationRate = Ventilation RatePerPerson People otalVentilationRate_m3_s = TotalVentilation Rate / 1000 Convert indoor conditions to enthalpy" doorEnthalpy HAProps SI (H, Tdb',Ctok* (IndoorTemp). Convert outdoor conditions to enthalpy" tdoorEnthalpy = HAProps SI (H', Tdb', CtoK*(OutdoorDBT Fensible and latent heat gains from people" msibleHeatPeople People SensibleHeatPerPerson entHeatPeople People LatentHeatPerPerson ensible heat gain from equipment" sibleHeatEquipment = Computers HeatPerComputer Type here to search GetSatHumRatio 6 HAProps SI 6 IndoorEnthalpy 4 4 3 OutdoorEnthalpy VentilationHeatGain The following variables only appear once. Check to ensure that the equations involving these va are properly formulated. Click on the variable to locate it in the Equations Window. Variable GetSatHumRatio LatentHeatPeople SensibleHeatEquipment Ciblat1--0---- O 2120 Speci Totally FEB 26 0 , 2 ۲ 3 ► 4 $ 694 Q ض A CES tv♫ W MacBook Pro A e * > 5 o G Search or type URL % ala 5 & 67 27 T ق 6" ف 6.16 Y ១ R W 90 S⟫>> E ی D 95 ي س 3 N LL F Jo 8 A * 000 w כ U غ E G HT JSee Answer
Q16: AREN 4110/5110 BUILDING ENERGY SYSTEMS ENGINEERING Spring 2024 Project Information PROJECT 2: INDUSTRIALIZED CONSTRUCTION You have been hired as the principal design engineer by a startup company attempting to develop volumetric mod- ules for industrialized construction serving the multifamily housing market. The company develops and delivers from its new factory, a former train depot, volumetric modules 20 m long, 5 m wide, and 3 m tall, with two 9 m long rooms on each side, separated by a 2 m hallway. Two modules are each aligned along the long axis to form two one-bedroom apartments with 90 m² (2x5mx9m) floor area, one on each side of the hallway, as shown in Figure 1 below. Module A will include the kitchen and liv- ing area, with an entry door from the hallway and a small balcony accessed by a sliding glass patio door. Module B will include the bedroom, bathroom, laundry, and all mechanical equipment. The bedroom will have a large window on the exterior wall. Within each apartment, Module A and Module B are connected by one or more doorways. 2.00m 20.00m Module A Module B 11 Figure 1: Two volumetric modules create two apartments separated by hallway, with forty apartments in the building The multifamily building will have four floors with ten modules per floor, creating ten one-bedroom apartments per floor, for a total of 40 apartments in the new building. The four residential floors will sit on top of a common base- ment. Module B is to be equipped with two energy pods, one for each apartment. The energy pod integrates and delivers all building services, i.e., heating, cooling, dehumidification, ventilation, and domestic hot water. The energy pods are designed to support an all-electric building in which water-to-air heat pumps deliver either heating or cooling and are connected to a common water loop that runs throughout the building. Heat pump hot water heaters draw their source of heat from the same building loop to deliver domestic hot water to a 200 L hot water storage tank that serves showers, fixtures, and appliances. Tenants are expected to have their own laundry facilities, i.e., washer and dryer. The dryer is to be a heat pump dryer, also connected to the building loop, that does not require any provision for exhaust. Each apartment thus features three heat pumps: one for heating and cooling, one for domestic hot water, and one for the dryer. The energy pods provide mechanical ventilation with energy recovery using a crossflow air-to-air heat exchanger delivering ventilation air according to ASHRAE Standard 62.2-2022. The energy pods are also a central hub for fire protection and domestic plumbing, including all domestic cold and hot water, waste, and vent piping. While you will not be evaluating any fire protection or domestic plumbing designs for this project, it would be logical to con- sider locating the energy pods adjacent to kitchen, bath, and laundry facilities. Page 1 of 4 April 2, 2024 AREN 4110/5110 BUILDING ENERGY SYSTEMS ENGINEERING Spring 2024 Figure 2 shows a schematic diagram of a water loop heat pump system in a commercial building, with multiple wa- ter source heat pumps connected to the common building water loop. It is common to have the building loop con- nected to a boiler and cooling tower as a common heat source and sink, respectively. Cooling Tower Boiler -Pumps Horizontal WLHP (typical) Supply Piping Return Piping Figure 2: Water loop heat pump system schematic for conventional boiler and cooling tower configuration In our case, our building uses a ground loop as the heat source and heat sink. The building has its own ground source heat exchanger (GSHE) with bore holes extending 100 m into the ground, connected to the water loop in the building via a plate frame heat exchanger. The GSHE was previously constructed during site preparation. The water coming from the GSHE is delivered to the plate frame heat exchanger, located in a mechanical space in the basement, with a constant temperature of 10°C. The ground loop has a variable speed pump assembly that maintains a temperature difference of 5°C for the ground water, i.e., when the building's water loop is rejecting heat to the ground in the summer, the water returned to the ground is at a temperature of 15°C, while during the winter, when heat needs to be added to the water loop, the water returned to the ground is at a temperature of 5°C. The choice for ground coupled heat pumps is motivated by the elimination of electric backup heat that would otherwise be neces- sary for airsource heat pumps in cold climates such as Madison, WI. This electric backup heat would require signifi- cant electrical distribution systems upgrades that the electric utility desperately wants to avoid, given all the other new electric loads expected to burden the grid such as electric vehicles. Design Assignment April 2, 2024 Page 2 of 4 AREN 4110/5110 BUILDING ENERGY SYSTEMS ENGINEERING Spring 2024 • • Modular apartment design O You are expected to develop a floorplan for the one-bedroom apartments including one bedroom, one bathroom, living room, kitchen, laundry area, and storage. Figure 1 shows the basic shape of volumetric modules and the apartments. While the figure shows loca- tions for doors and wall openings, you are welcome to design the apartments as you choose within the specified volumes of the modules and apartments. ○ The two energy pods, described in more detail below, should be placed in Module B. Building assumptions O O O O O Project location: Washington DC Building orientation: Long axis is east to west, windows face north and south Building envelope: Opaque construction: ASHRAE Wall 5 (see Appendix C for properties), with the exception that the insulation is 15 cm thick and has an R-value of 3.4 m²°C/W. Windows and patio door: Low-emissivity double-pane with U = 1.5 W/m²°C and SC = 0.42 Occupancy: Assume continuous occupancy of two persons per one-bedroom apartment. Internal gains: Assume design lighting levels of 4 W/m² and miscellaneous equipment of 6 W/m² of floor area. Assume equipment operates continuously and lighting operates only between the hours of 06:00-08:00 in the morning and 19:00-23:00 in the evening for a total of six hours per day. While the ground floor and top floor will have somewhat different heating and cooling loads, you will model level 2 as the typical floor and assume each floor has identical loads. Building energy systems ○ ○ о A dedicated ground loop exchanges heat with the building loop through a plate frame heat exchanger (PFHX). Assumptions for PFHX: • water supply to building = 10 °C water returned to ground in heating = 5 °C water returned to ground in cooling = 15 °C A building water loop runs through the building and is connected to heat pumps in each residential unit. These heat pumps, including those for space conditioning, water heating, and clothes drying, add heat to or draw heat from the building water loop. All mechanical equipment in each residential unit should be placed in a single integrated energy pod (ePod) within the unit. The pods on each floor are expected to be aligned ver- tically, with all plumbing and HVAC piping connecting in the basement below. While the ePods will be in Module B, it is expected that there will be a single vertical chase for the pair of apartments shown in Figure 1, aligned with one of the two ePods. That is, there should be a total of five vertical chases for the four-story, forty apartment building. ○ Your main task for this project is to design the modular ePods that are repeated through- out the building. ○ Space conditioning system о Each apartment has a single water-to-air heat pump to meet both heating and cooling needs. Ventilation system Each apartment will have its own ventilation and exhaust, with dedicated outdoor grilles on the apartment façade. April 2, 2024 Page 3 of 4 AREN 4110/5110 BUILDING ENERGY SYSTEMS ENGINEERING о Exhaust ■ Spring 2024 Ventilation air will be conditioned by an energy recovery ventilator (ERV) using bathroom exhaust air. The exhaust from the toilet will precondition the incoming ventilation air through the ERV. The exhaust is continuous at the required ventilation flow rate. The water heating system comprises a 200 L water storage tank and a dedicated water-to- water heat pump. ○ The clothes dryer is a heat pump dryer that does not require any exhaust. Workflow: о Ο ○ O O O O о о Space design for each of the two standard apartments (north-facing and south-facing). Each apartment has a single bedroom and will be occupied by two people. The layout should include a central ePod for all mechanical and plumbing equipment. Consider the adjacency of the kitchen, bathroom, and laundry as well as HVAC air distribution. Ventilation calculation using ASHRAE 62.2-2022 (Available as read-only document at https://ashrae.iwrapper.com/ASHRAE_PREVIEW ONLY STAND- ARDS/STD_62.2_2022). Refer to Section 4.1.1 and Equation 4-1b. Load calculations using thermal network methodology of the starter file located in the Canvas P2 folder. ePod design to accommodate all required equipment, to horizontally connect to the out- doors for ventilation and exhaust. The ePod should connect the occupant needs to the equipment in the pod. There should be horizontal connectivity between the two apart- ments sharing the modules to allow a shared mechanical shaft. The mechanical shaft will provide vertical connectivity to adjacent volumetric modules above or below. Select a water-to-air heat pump for each apartment based on load calculations. Select a water-to-water heat pump for each apartment water heater. Select a heat pump clothes dryer for each apartment. Layout all ductwork for a) ventilation and b) bathroom exhaust systems. No pressure drop calculations are required. Layout the piping in each volumetric module to connect the three heat pumps to the building water loop. Layout the piping for the building water loop that connect all the apartments and pods in the building. You do not need to perform sizing or pressure loss. Submittals: • ○ 00 ○ Ο 0 0 0 A single PDF file Clear identification of project group, group members, and location of design. Executive summary Description of the architectural and ePod designs of the apartments and modules, includ- ing design rationale. Isometric drawings of the ePods, including equipment locations, to effectively communi- cate your design to the startup company leadership. One-line diagrams of piping and ducting systems within the modules and of the building water loop connecting the modules. Summary of calculations and selections with appropriate tables of results. Appendix: Representative EES load calculation code for one zone, including formatted equations. April 2, 2024 Page 4 of 4See Answer
Q17:Problem 1: Superheated water vapor at 1.4 MPa and 250 C is allowed to cool at constant volume until the temperature drops to 125 C. At the final state, determine (a) the pressure, (b) the quality, (c) the enthalpy.See Answer
Q18:Problem 2: Complete the following table using the property tables for refrigerant-134a. Show the complete steps in finding the missing information of each state. If x is undefined, include that as a comment. T (°C) P (kPa) v (m³/kg) -4 320 10 0.0065 850 140 0.2 x Phase Description Compressed Liquid Saturated Mixture Saturated Vapor Superheated VaporSee Answer
Q19:Problem 3: Diffuser V₂ << V₁ Calculate the velocity at the exit of a diffuser when air at 100 kPa and 30°C enters it with a velocity of 350 m/s and the exit state is 200 kPa and 90°C. Note: do not use the specific heat method - find the enthalpy directly from EES (the tutorial videos describe how to find the properties of each state).See Answer
Q20:Problem 1: Superheated water vapor at 1.4 MPa and 250 C is allowed to cool at constant volume until the temperature drops to 125 C. At the final state, determine (a) the pressure, (b) the quality, (c) the enthalpy.See Answer

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