A cross-flow heat exchanger with air mixed and oil unmixed, (C = 2150 J/kg. °C), the mass flow rate ratio (m°/m°) leaves at 51°C, while oil enters @ 83°C, what is the effectiveness of the heat exchanger of the heat exchanger “%"? =1006 J/kg.°C, C. P oil P air 2.8, Air' ēnters at 25°C and air oil
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- Forced air flows over a convective heat exchanger in a room heater resulting in an average convective heat transfer coefficient, h=# # # W/ (m? degree C). The surface temperature of the heat exchanger may be considered constant at 75 degree C, the air being at 25 degree C. Determine the heat exchanger surface area required for MJ/h of heating, 2Heat transfer problem.In a counter flow heat exchanger, water, flow rate 0.05kg/s, enters at 400K and leaves at 330k. The water is cooled by air that enters at 0.75 kg/s and 300K. The overall heat coefficient is 200 W/m2K. Assume air outlet is 320k only for evaluating the properties of the air. You can use saturated liquid water properties (a).what is the air outlet temperature.(b)log mean temperature difference (c)required heat transfer surface area.A ramjet drives a missile at V0=966m/s at an altitude of 33.5km (air density 0.01kg/m3 and T0=232K). If the missile inlet captures a stream tube of air A0=1,1m2 in area, the fuel-to-air ratio is 0,049, and the fuel heating value is 50MJ/kg. if the ramjet engine produces net thrust Fn= 8,9 kN , What is the useful power that the engine introduces to the missile?
- The clean U for an exchanger is 770 BTU/(hr 0 F ft2). Its tube area is 550 ft2. After operating for several months, it is heating water from 40 0F to 150 0F at a flow rate of 200 GPM with a heating fluid on the shell entering at 300 0F and exiting at 170 0 F. Has the overall U decreased significantly? how many 1.0 inch diameter, 20 ft long tubes would it take to equal the 550 ft2 area?In a single pass, cross flow heat exchanger where two fluids are not mixed, water with a temperature of 35oC, a mass flow of 1 kg / s, a specific heat capacity of 4197 J / kgK, 250oC, a mass flow of 1.5 kg / s, a specific heat capacity of 1000J / kgK. heated by hot gas. If the heat transfer area of the heat exchanger is 40 m2 and the total heat transfer coefficient is 100 W / m2K, calculate the exit temperatures of the water and hot gas from the heat exchanger using the NTU method.Hello, i have an example question with an answer already given. Please help me in finding its solution so i can review and see the process and understand the concept. Thank you very much1.Question: Water at 15°C is pumped from a reservior at a rate of 0.1131 m3/s where the local atmospheric pressure is 94.6 kPa. The total head loss in the suction pipe is 1 m. From the manufacturer data, the NPSHrequired at this operating point is 7.8. Determine the maximum height hs (meters) before cavitation can occur. Round off your answer to 3 decimal places.Answer: 0.669
- Compressed air with a flowrate of 7 kg/min flows through a two-stage turbine and heat exchanger system as follows: At the entrance to the system (point 1), the pressure of the air is 9 bar and the temperature of the air is 403 K. From 1-2 the air passes through a heat exchanger which increases its temperature to 952 K. From 2-3 the air passes through a turbine, with a pressure ratio of 3 (i.e. bevelled p subscript 2 over p subscript 3 equals 3). This first turbine has an isentropic efficiency of 60%. From 3-4 the air passes through a second heat exchanger, which increases its temperature back up to 952 K. From 4-5 the air passes through a second turbine with a pressure ratio of 3 and an isentropic efficiency of 80%. The properties of air are: cp = 1.005 kJ/kgK, cv = 0.718 kJ/kgK, R = 0.287 kJ/kgK, and gamma= 1.4. Select the correct value for each of the following values: The heat transfer to the air in the first heat exchanger (i.e. Q with dot on top subscript 12) in kW: The…Inlet: Air, 72 kPa, 291.15K, 230 meters/second Outlet: Air, 98 kPa, 0 meters/second What is the temperature at the outlet? Cp=3.5(8.3145). No heat exchange.Catalogue data of a water-cooled condenser of a manufacturer gives the following details: Condensing temperature 48.9°C Water inlet temperature 37.8°C Water flow rate 20.694 kg/s Capacity 145 tons Estimate the capacity of this condenser with the same water flow rate but with an inlet temperature of 30°C and a condensation temperature of 42°C. The evaporation temperature may be assumed to be constant at 2.2°C.
- please written solution by hand and how can com h6 and s6 when T turbine inlet = 130 C , P heat exchanger = 20 bar , P condenser = 5 bar , Tw . cond out = 25 C Tw cond in = 17.5 C efficiencies compressor = 67.5 efficiencies turbine = 78 m. refrig =0.4 kg/sAir (diatomic, MW = 28.8664 g/mol) at 1.7 atm gage (where Pam = 1 atm) and 15°C enters a 70-m long horizontal 75-mm-ID steel pipe (€ = 4.6(10) m). The velocity at the entrance of the pipe is 60 m/s. Assuming isothermal flow, what is the absolute pressure (atm) at the discharge end of the line? Use Churchill equation for the friction factor.Consider a CI engine with a fuel injector mounted at the center of the cylinder head. The bore of the engine is 10 cm. The injector has a nozzle diameter of 0.05 mm and a discharge coefficient of 0.65. The fuel injection pressure is 600 bar. If the average cylinder pressure during injection is 50 bar and the density of the fuel is 800 kg/m3, estimate the time for a fuel particle to reach the cylinder wall.