1. A thin-walled double pipe, counter-flow heat exchanger is to be used to cool oil (Cp = 2.2 kJ/kg.ºC) from 150 °C to 40 °C at a rate of 1.4 kg/s by water (Cp = 4.18 kJ/kg. °C) that enters at 20 °C at a rate of 2.3 kg/s. The diameter of the tube is 13 cm and its length is 60 m. Determine the overall heat transfer coefficient of this heat exchanger using %3D

1. A thin-walled double pipe, counter-flow heat exchanger is to be used to cool oil (Cp = 2.2 kJ/kg.ºC) from 150 °C to 40 °C at a rate of 1.4 kg/s by water (Cp = 4.18 kJ/kg. °C) that enters at 20 °C at a rate of 2.3 kg/s. The diameter of the tube is 13 cm and its length is 60 m. Determine the overall heat transfer coefficient of this heat exchanger using %3D

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

A heat exchanger is used to cool oil (with cp = 2.2 kJ/kg.°C) from 170 to 50°C by water (with cp = 4.18 kJ/kg.°C) that enters the heat exchanger at a rate of 2 kg/s and inlet temperature of 10°C. If the flow rate of the oil is 1.5 kg/s, determine the exit temperature of water and the heat transfer rate from the oil.
In an heat exchanger of parallel flow type, water enters at 60°C and leaves at 80°C while oil of specific gravity 0.8 enters at 250°C and leaves at 100°C. The specific heat of oil is 2.5 kJ/kg K and surrounding temperature is 300 K. Determine the loss in availability on the basis of one kg of oil flow per second.
Automobile air-conditioner gives up 18 kW at 65 km/h if the outside temperature is 35°C. The refrigerant temperature is constant at 65°C under these conditions, and the air rises 6°C in temperature as it flows across the heat exchanger tubes. The heat exchanger is of the finned-tube type shown in Fig. 3.6b, with U? 200 W/m°K. If U? (Air velocity) 0.7 and the mass flow rate increases directly with the velocity, plot the percentage reduction of heat transfer in the condenser as a function of air velocity between 15 and 65 km/h. b. A section of an automotive air condition- tall wavy fins is allowed to mix with itself while unmixed
A well-insulated, thin-walled, counterflow heat exchanger is to be used to cool oil (cp = 2.20 kJ/kg.oC) from 150 to 40oC at a rate of 2 kg/s with water (cp = 4.18 kJ/kg.oC) that enters at 22oC at a rate of 1.5 kg/s. The diameter of the tube is 2.5 cm, and its length is 6 m. Determine (a) the rate of heat transfer and (b) the rate of exergy destruction in the heat exchanger.
In a large air-conditioning application, 1500 m3/min of air at 1 atm and 10◦C are tobe heated in a finned-tube heat exchanger with hot water entering the exchanger at 80◦C. The overall heat-transfer coefficient is 50 W/m2 · ◦C. Calculate the requiredarea for the heat exchanger for an exit air temperature of 37◦C and exit water temperature of 48◦C
In a large air-conditioning application, 1500 m3/min of air at 1 atm and 10◦C are to be heated in a finned-tube heat exchanger with hot water entering the exchanger at 80◦C. The overall heat-transfer coefficient is 50 W/m2 · ◦C. Calculate the required area for the heat exchanger for an exit air temperature of 37◦C and exit watertemperature of 48◦C.
A window air conditioning is operating with Refrigerant -R22. An engineer wants to collect data on the flow rate of the refrigerant. The refrigerant is passed through one inlet and one exit pipe (Flgure 2) of diameter 3 cm steadily at a pressure of 2.5 bar and temperature of 5 °C with a velocity of 3 m/s. Due to heat gain from its surrounding, the refrigerant leaves the pipe at a pressure of 2 bar and temperature of 25 °C. Figure 2. One inlet one exit pipe For the refrigerant, determine (a) The volume flowrate at the pipe inlet (b) The mass flow rate The velocity and volume flow rate at the pipe exit
Q3// a saturated steam is to be condensed at a temperature of 50 °C to produce a saturated water. The cooling water is drawn from a nearby lake, and enters the tubes of the condenser at 18 °C and leaves it at 27 °C. The surface area of the tubes is 58m and the overall heat transfer coefficient is 2400 W/m.°C. Assuming counter flow, determine: 1. The mass flow rate of the cooling water needed. 2. The rate of steam condensation. 3. The effectiveness of this condenser. Answer :( 99.9 kg/s, 1.57717 kg/s ,28.3%)
Air at -40 °C enters a jet combustion chamber with a velocity equal to 150 m/s. The exhaust velocity is 200 m/s, with 297 °C as outlet temperature. The mass flow rate of the gas (air-exhaust) through the engine is 7.6 kg/s. The heating value of the fuel is 45.9 MJ/kg and the combustion (to be considered as an external source) has an efficiency equal to 100%. Assume the gas specific heat at constant pressure (c,) to be 1.25 kJ/(kg K). Determine the kg of fuel required during a 4.8 hours flight to one decimal value.
An oil-fired thermal plant uses 0.002m^3/s of bunker oil whose relative density at 23.9C is 0.905. The specific enthalpy of steam in kJ/kg are as follows: boiler outlet = 3530.9, condenser inlet3 2289.5, pump inlet = 251. 96, boiler inlet = 259.05. The boiler of this plant is 90% effective in transferring the energy chargeable to the water. Using the ASME formula to compute the fuel's higher heating value, compute the possible steam consumption of this power plant in kg/s. a.) 22.1194 b.) 22.1933 c.) 22.2045 d.) 22.1412 Note: Use 4 decimal places in all computation.
A thin-walled, double-tube, counterflow heat exchanger is used to cool oil (Cp = 2.20 kJ/kg °C) from 150 to 40°C at a rate of 2 kg/s by means of water (Cp = 4.18 kJ/ kg °C), which enters at 22°C at a rate of 1.5 kg/s. Determine the rate of heat transfer in the exchanger and the leaving temperature of the water.
A well-insulated heat exchanger is to heat water (cp = 4.18 kJ/kg-°C) from 25°C to 60°C at a rate of 0.5kg/s. %3D The heating is to be accomplished by geothermal water (cp = 4.31 kJ/kg-°C) available at 140°C at a mass flow rate of %3D 0.5 kg/s. What is the temperature of exit Brine. Water 25°C Brine 140°C 60°C