l water flowing at 14 kg.s¹ entering at 18 monia with a mass flow rate of 18 kg.s-¹ perature and pressure of -12°C and 650 L pectively. The heat exchanger is to use th he liquid form, so no evaporation can be kPa absolute ania Qu essure
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Heat Exchangers
Heat exchangers are the types of equipment that are primarily employed to transfer the thermal energy from one fluid to another, provided that one of the fluids should be at a higher thermal energy content than the other fluid.
Heat Exchanger
The heat exchanger is a combination of two words ''Heat'' and ''Exchanger''. It is a mechanical device that is used to exchange heat energy between two fluids.
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- A single-shell, four-tube-pass heat exchanger is used to cool water flowing at 14 kg.s¹ entering at 18°C using ammonia with a mass flow rate of 18 kg.s¹ and an entry temperature and pressure of -12°C and 650 kPa, absolute, respectively. The heat exchanger is to use the ammonia in the liquid form, so no evaporation can be allowed. At 620 kPa, absolute pressure, ammonia evaporates at 10.5°C. The overall heat transfer coefficient of the heat exchanger is 568 W.m2 and the heat transfer surface area is 75 m². Determine the outlet temperatures of the hot and cold streams. Identify whether the heat exchanger, operating under the conditions shown, satisfies the rec irement that the ammonia remains liquid throughout the process. Sources for any researched material properties must be properly referencedUsing that information and this table For the average monthly rate of geothermal heat available, determine, for the real case: in a tabular format and show sample calculation for one month. the necessary monthly average mass flow rate (in kg/s) of the refrigerant that must be pumped through the heat exchanger to collect the thermal energy from the available geothermal hot water flow rate if the hot water was cooled by 5°C. What should be the flow capacity (in kg/s) of feed pump of the ORC heat engine that you are designing and the monthly average net electric power generation capacity (in kW). 2. the monthly average net electric power generation capacity (in kW) and yearly average net electrical power generation capacity (in kW).in a surface condenser the pressure of steam is Q12 bar. The rote of cooling water flow is 40 kgAg of steam condensed Condensate teaves at 44°C and dhe rise in termperature of circuiating water is 13°C Determine the dryness fraction of steam entering the condenser.
- 20,000 lb/hr of air is to be cooled from 150°f to 100°f by water flowing in a shell-and-tube heat exchanger. cooling water is available at 70°f and should leave the exchanger at 95°f. available to do this cooling assignment is a one-shell pass, two-tube pass exchanged consisting of fifty 1-in OD 18 BWG copper tubes, each 10 ft long. the tubes are arranged inside a 10-in shell on a staggered 1-1/4- inch triangular pitch with baffles spaced every 6 in. is this exchanger satisfactory?Hi I need asisstance with a thermo review problem, Thank you! A heat exchanger is used to heat air. The air enters at 300 K with a flow rate of 5 kg/s. The air is heated by a separate stream of H2O that enters the heat exchanger at 300 kPa, saturated vapor and leaves as saturated liquid. If the H2O flow rate is 0.2 kg/s, determine the exit temperature of the air (K). Cpair=1.027 kJ/kgK. Note the air and H2O areseparate streams. No mixing occurs.A 4-pass-low-pressure surface type feedwater heater is designed to heat 92,730 kg/hr of feedwater from 40°C initial to 80°C final temperature using steam bleed at 70 kpa abs. containing 2,645 Kj/kg enthalpy. Assume no subcooling of condensate, determine the effective length of 19 mm O.D x 2 mm thick Muntz metal tubes to be installed, if the water velocity inside the tubes is 1.22 m/s and U = 3000 W /m²k based on the external surface of the tubes. 4.
- in a 10-m long center-current flow tubular heat exchanger, a liquid food, flowing in the inner pipe (inside diameter 5 cm), is heated from 4 to 60 C for pasteurization. In the outer tube (diameter 10 cm), hot water enters at 95 C and exits at 80 C. A) If the mass flow rate of the hot water is 5 kg/s, what is the flow rate of the pasteurized product? The specific heat of the water is 4.2 kJ/(kg C), specific heat of product is 3.8 kJ/(kg C) B) what is the log mean temperature difference C) What is the overall heat transfer coefficient for the heat exchanger based on the outside surface?. The exhaust gas regenerator (counter-flow heat exchanger) for a gas turbinehandles 1.9 kg/sec of air from its compressor and heats it by means of 2.2 kg/secof hot exhaust gas. Exhaust gas enters the regenerator at 596°C and leaves at312°C. Compressed air enters the regenerator at 220°C. For this temperaturerange a constant pressure specific heat for the exhaust has may be estimated at1090 J/kg-°C. Assume no heat transfer other than between the generator fluids.Determine the log mean temperature difference for the exchanger, °CA. 16.98 B. 26.98 C. 36.98 D. 46.986. A heat exchanger was installed purposely to cool 0.50 kg of gas per second. Molecular weight is 28 and k=1.32. The gas is cooled from 150 deg C to 80 deg C. Water is available at the rate of 0.30 kg/s and at a temperature of 12 deg C. Calculate the exit temperature of the water.
- 27. Air is being heated with steam in a heat exchanger as shown in following fiqure. Saturated water opy yer vapor enters this unit at 35°C at a rate enters the unit at 20°C, and leaves at 30°C at same twarie, process. 10,000 kg/h and leaves as saturated liquid at Marut, iwarr Air generation associated with Determine the rate of MarutPrewari Air 20°C 32°C Steam 35°C 10,000 kg/h Marut Tiwari 30°C Marut Tiwari3.) An ammonia compressor operates at evaporator pressure of 316.02 kPa and a condenser pressure of 1557 kPa. A twin-cylinder compressor with bore to stroke ratio of 0.85 is to used at 1200 rpm. The actual volumetric efficiency is 92% and compression and mechanical efficiency is 78% and 80% respectively. For a cooling capacity of 25 TR, (a) the sketch the p-h diagram labeling the evaporating and condensing temperature and pressures (b) define the all properties of ammonia taken from saturation table. Determine (c) the quantity of cooling water in the condenser in kg/min if the increase in temperature is 8°C, (d) the bore and stroke expressed in cm and (e) the size of the driving motor in hp. Given: h2 = h at 1557 kPa and s2 = s1 1695 kJ/kgQ.2. Air enters a steady-flow heat exchanger with a mass flow rate of 2 kg/s as shown in Figure. Determine (a) the rate of heat transfer to the air in the heat exchanger, (b) the power output from the turbine assuming no heat loss, and (c) the velocity at exit from the nozzle. (Cp atr = 1.005 kJ/kg. K) T=600 C T- 12 C V=3 m/s Air Нeat v-3 m/s Exchanger Turbine T= 200 C V - 25 m/s T= 160 C Nozzle