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- This is Heat Exchange Please explain niceHi 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.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?
- Steam with 80% quality is being used to heat a 40% total solids tomato purée as it flows through a steam injection heater at a rate of 400 kg/h. The steam is generated at 169.06 kPa and is fl owing to the heater at a rate of 50 kg/h. Assume that the heat exchanger effi ciency is 85%. If the specifi c heat of the product is 3.2 kJ/(kg K), determine the temperature of the product leaving the heater when the initial temperature is 50C. Determine the total solids content of the product after heating. Assume the specific heat of the purée is not infl uenced by the heating process.A water tube boiler produces 250,000 pounds of steam per hour at 1200 psia and1000OF from feed water entering the boiler at 1500 psia and 360oF. Fuel oil havinga higher heating value of 18,200 Btu/lb is supplied to the burners at the rate of20,700 lb/hr. Furnace volume is 1500 cubic feet. Calculate the equivalentevaporation, lb/hrA. 300,117 B. 300,317 C. 300,517 D. 300,717numerator gives the actual heat 2-3. Heat Exchange Between Oil and Water. Water is flowing at the rate of 1.13 kg/s in a 1-2 shell-and-tube heat exchanger, and is heated from 45°C to 85°C by an oil hav- ing a heat capacity of 1.95 kJ/kg K. The oil enters at 120°C and leaves at 85°C. Cal- culate the area of the exchanger if the overall heat-transfer coefficient is 300 W/m2. K
- 11. 30 tonnes of ice from and at 0°C is produced in a day of 24 hours by an ammonia refrigerator. The temperature range in the compressor is from 298 K to 258 K. The vapour is dry saturated at the end of compression and expansion valve is used. Assume a co-efficient of performance of 60% of the theoretical and calculate the power in kW required to drive the compressor. Latent heat of ice is 334.72 kJ/kg. Enthalpy Entropy of liquid Entropy of vapour kJ/kg Тетр. K kJ/ kg kJ/ kg K Liquid Vapour 298 100.04 1319.22 0.3473 4.4852 258 -54.56 1304.99 - 2.1338 5.0585 [Ans. 21.59 kW]A counter-flow heat exchanger is designed to heat a fuel oil from 45°C to 100°C while the heating fluid enters at 150°C and leaves at 115°C. Calculate the arithmetic mean temperature difference. Badly needed asap. I will rate helpful. Thank you in advance.DS Community Downl... Haritalar EOkuma list iş İÇİN Giriş yap 口 口山凸9 İNGİLİZCE An air-cooled condenser is used to condense isobutane in a dual geothermal power plant. Isobutane, air entering at 22 oC with a flow of 18 kg/s (cp = 1.0 kJ / kg.K)is condensed at 85 oC. The total heat transfer coefficient for this heat exchanger is 2400 W/m2.K and surface area is 2.6 m2. What is the output temperature of the air? Çeviri yap: Google Bing
- Please find the highest thermal efficiency possible, while remaining within the boundaries. What is required: -Power produced must be at least 60 Mega Watts -Thermal efficiency must be greater than 36% -Back-work ratio must be smaller than 48% Assume: -air is the working fluid -specific heats vary with temperature (use table A-17) -Compressor inlet is at 1atm and 300k -the combustion process is isobaric and is modeled as a heat exchanger -Turbine exhaust is the same pressure as compressor inlet Compressor specifics: -Max volume flow rate (m^3/h) = 600,000 -Max outlet pressure (atm) = 12 -Isentropic efficiency = 90% Combustion chamber and gas tubine specifics (Note these come as a set) -Max pressure = 16.7 atm -Max temp = 1500 (celcius) -Turbine isentropic efficiency = 92% -Max heat rate = 230MW(1) A counterflow, concentric tube heat exchanger is used to cool the lubricating oil for a large industrial gas turbine engine. The flow rate of cooling water through the inner tube (D; = 20 mm) is 0.5 kg/s, while the flow rate of oil through the outer tube (Do = 45 mm) is 0.3 kg/s. The oil and water enter at temperatures of 100 and 30°C, respectively. A) What is the main difference between parallel and counter flow heat exchangers? B) How long must the tube be made if the outlet temperature of the oil is 60°C? C) If the heat exchanger is changed to parallel flow heat exchanger, how long must the tube be made if the outlet temperature of the oil is 60°C?Question 2 En. Karim recently install a hot water system operates by a solar energy. The system consists of double pipe counter flow heat exchanger. Cold waters enters a tube at 22°C at a rate of 0.1 kg/s, while hot air enters the heat exchanger at 90°C at a rate of 0.3 kg/s. The specific heat for both cold water and hot air is cp = 4180 J/kg.K and c, = 1010 J/kg.K , respectively. The overall heat transfer coefficient based on the inner side of the tube is 80 W/m².K. The length of the tube is 12 m and the internal diameter of the tube is 1.2 cm. En. Karim assigned you do the complete analysis on this hot water system including to calculate the effectiveness of the heat exchanger. As an engineer, you have to determine: i. the heat capacity rates of both fluids, ii. the maximum rate of heat transfer (kW), iii. the effectiveness of the heat exchanger (NTU method), iv. the actual rate of heat transfer (kW), and v. the outlet temperatures of both cold water and hot air.