Under what conditions will the temperature rise of the cold fluid in a heat exchanger be equal to the temperature drop of the hot fluid?
Q: What will affect the heat transfer rate in heat exchangers?
A: Heat transfer rate in a heat exchanger are affected by a number of factors and they are as follows,…
Q: Milk is flowing through a heat exchanger at a rate of 2000 kg/h. The heat exchanger supplies 111,600…
A: Given Data m= 2000 kg/h Q= 111,600 kJ/h. To=95°C C=3.9 kJ/kgK
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Q: Hot oil (cp = 2200 J/kg·K) is to be cooled by water (cp = 4180 J/kg·K) in a 2-shell-passes and…
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Q: Oil in an engine is being cooled by air in a crossflow heat exchanger, where both fluids are…
A: Given, The specific heat of the oil, cp,h = 2047 J/kgK The specific heat of the air, cp,c = 1007…
Q: . What is shown in the figure? Where is it used and how does it work? . What is the nature of heat…
A: a. The figure shown is heat exchangers. Typical application of heat exchangers is to use heat…
Q: Water with a flow rate of 225 kg / h and a specific temperature of 4188 J / kgK is heated by a…
A: Given data: Mass flow rate of water, m˙w=225 kg/hr and it's specific heat, Cw=4188 kJ/kg.K.…
Q: In a thin-walled double-pipe heat exchanger, when is the approximation U = hi a reasonable one? Here…
A: Consider the case of convective heat transfer on both the sides of a double pipe. Draw the Thermal…
Q: Explain how the LMTD method can be used to determine the heat transfer surface area of a multipass…
A: Cross Flow heat exchanger: In this type of heat exchanger hot and cold fluid travel in…
Q: Under what conditions can a counter-flow heat exchanger have an effectiveness of one? What would…
A: Effectiveness of heat exchanger is given by If the capacity ratio is one, then the NTU value is…
Q: (1) In a double tube heat exchanger in which hot and cold fluids flow into a countercurrent flow,…
A: We will answer the first question since the exact one is not specified. Please resubmit the question…
Q: To cool the lubricating oil, a concentric counter-flow heat exchanger is utilized, with the water…
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Q: Q 3.1: What effect do finned surfaces have on the overall heat transfer coefficient and hence the…
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Q: A shell-and-tube heat exchanger with 2-shell passes and 8-tube passes is used to heat ethyl alcohol…
A: It is required to determine the logarithmic mean temperature difference for counter flow.
Q: In a large air-conditioning application, 1500 m3/min of air at 1 atm and 10◦C are to be heated in a…
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Q: The temperature difference between the hot and cold fluids in a heat exchanger is given to be ∆? at…
A: The symbols representing the temperature difference in the hot and cold fluids at each end are not…
Q: In the heat transfer relation Q= UAsFDTlm for a heat exchanger, what is the quantity F called? What…
A: Given data: The given heat transfer equation is: Q=UAsFDTlmIn the given equation of the heat…
Q: Hot water at 60°C is cooled to 36°C through the tube side of a one-shell pass and two-tube passes…
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Q: Concentric Tube Heat Exchanger List at least two assumptions that are being made in the heat…
A: TO DETERMINE :- (a) two assumptions, (b) reasons for the assumptions taken.
Q: What is application of parallel flow heat exchanger? and counter flow heat exchanger?
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Q: What are the classifications of the heat exchanger, what are it applications, and what are the…
A: Complete information about heat excahanger given below: Heat exchanger defined as a device which…
Q: A thin-walled double-pipe counter-flow heat exchanger is to be used to cool oil (cp = 2200 J/kg·K)…
A: Given :Mass flow rate of oil = 2 kg/sMass flow rate of water = 1.5 kg/sSpecific heat of oil = 2200…
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Q: Oil Inner tube d, = 40 mm d; = 20 mm Water Oil Figure Q1
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Q: Consider a double-pipe parallel-flow heat exchanger of length L. The inner and outer diameters of…
A: Here it is given :
Q: What is the role of the baffles in a shell-and-tube heat exchanger? How does the presence of baffles…
A: Baffles are flow directing vanes or panels which are used in the heat exchanger. These are designed…
Q: Hot coolant water is supplied to a shell and tube heat-exchanger with two shells and twelve tube…
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Q: Saturated water vapor at 100°C condenses in the shell side of a one-shell and two-tube heat…
A: Given data as per question water vapor temperature =100°C Surface area = 0.5 m2 Overall heat…
Q: What are the common causes of fouling in a heat exchanger? How does fouling affect heat transfer and…
A: The deposition of unwanted materials on the surface of the heat exchanger is known as fouling.
Q: The inlet temperatures for a double-pipe heat exchanger contains water are 35 °C and 200 °C. If…
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Q: Explain how the maximum possible heat transfer rate ???? in a heat exchanger can be determined when…
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Q: What is the heat capacity rate? What can you say about the temperature changes of the hot and cold…
A: The heat capacity rate is defined as “the product of the mass flow rate and the specific heat of the…
Q: Explain the role of the baffles in a shell-and-tube heat exchanger as well as how the presence of…
A: Baffles are fluid flow controlling plates that are generally used to avoid stratification and…
Q: In the engine oil industry, double-pipe counter-flow heat exchanger is used to cool the hot engine…
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Q: Water enters at 20 ℃ at a rate of 0.2 kg/s in a double-pipe parallel flow heat exchanger is to be…
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Q: What effect do finned surfaces have on the overall heat transfer coefficientand hence the…
A: Fin: It is a extended surface from the hot surface to increase the heat transfer area.
Q: Why does a “mixed” or “unmixed” fluid arrangement influence heat-exchanger performance? with…
A: Mixing of the fluid provides better performance due to the direct energy transmission of the heat…
Q: Why does a “mixed” or “unmixed” fluid arrangement influence heat-exchanger performance?
A: Given: Why does a “mixed” or “unmixed” fluid arrangement influence heat-exchanger performance?
Q: Consider two double-pipe counter-flow heat exchangers that are identical except that one is twice as…
A: In the counter-flow heat exchanger, the hot and the cold fluid flow opposite to each other. Its…
Q: Hot water at 60℃ is cooled to 36℃ through the tube side of a 1–shell pass and 2-tube passes heat…
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Q: Show that the temperature profile of two fluid streams (hot and cold) that have the same heat…
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Q: What are the common approximations made in the analysis of heat exchangers?
A: The common approximations given that made during the analysis of heat exchangers, (1) The heat…
Q: What effect do finned surfaces have on the overall heat transfer coefficientand hence the…
A: given: What effect do finned surfaces have on the overall heat transfer coefficient hence the…
Q: d) Which of the following Fins/Heat exchanger will transfer more heat and why? Justify your answer.…
A: Write the expression for the heat transfer rate. Here, h represents the heat transfer coefficient,…
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.
Under what conditions will the temperature rise of
the cold fluid in a heat exchanger be equal to the temperature
drop of the hot fluid?
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- Why does a “mixed” or “unmixed” fluid arrangement influence heat-exchanger performance?Water enters a body-tube heat exchanger as a hot fluid at a flow rate of 2.6 kg/s at 68 °C. The cold fluid is water at a flow rate of 1.8 kg/s and the inlet temperature to the heat exchanger is 32°C. Calculate the outlet temperature of the cold stream since the heat exchanger efficiency is known as 0.55. NOTE: For water, cp=4179 J/kg.K will be taken as constant.Shell-and-tube heat exchangers with hundreds of tubes housed in a shell are commonly used in practice for heat transfer between two fluids (shown in Figure 1). Such a heat exchanger used in an active solar hot-water system transfers heat from a water-antifreeze solution flowing through the shell and the solar collector to fresh water flowing through the tubes at an average temperature of 60°C at a rate of 15 L/s. The heat exchanger contains 80 brass tubes 1 cm in inner diameter and 1.5 m in length. Disregarding inlet, exit, and header losses. (a) Determine the pressure drop across a single tube and the pumping power required by the tube- side fluid of the heat exchanger. After operating a long time, 1-mm-thick scale builds up on the inner surfaces with an equivalent roughness of 0.4 mm. For the same pumping power input, (b) Determine the percent reduction in the flow rate of water through the tubes. 80 tubes 1.5 m I cm Water Figure 1. Shell and Tube heat exchanger
- Consider a heat exchanger in which both fluids have the same specific heats but different mass flow rates. Which fluid will experience a larger temperature change: the one with the lower or higher mass flow rate?How does a cross-flow heat exchanger differ from a counter-flow one? What is the difference between mixed and unmixed fluids in cross-flow?2-b Hot exhaust gases, which enter a finned-tube, cross-flow heat exchanger at 300 °C and leave at 100 °C. are used to heat pressurized water at a flow rate of 1 kg/s from 35 °C to 125 °C. The specific heat of water at the average water temperature is 4197 J/kg. K. The overall heat transfers coefficient based on the gas-side surface area is Un = 100 W/m².K. Determine the required gas-side surface area A, using the LMTD and E-NTU method.
- Water with a flow rate of 225 kg / h and a specific temperature of 4188 J / kgK is heated by a body-tube heat exchanger with cross flow from 35 K to 85 K. In the heat exchanger, 8 pipes with a diameter of 100 mm pass through the body 10 times. Oil with a flow rate of 225 kg / h, a temperature of 210 K and a specific temperature of 2095 J / kgK will be used as a hot fluid. If the total heat transfer coefficient is 555 W / m2K, what is the pipe length? Take the correction factor of 0.78based on a double-pipe counter flow heat exchanger to be used to cool oil that enters the heat exchanger at 300°F to 105°F at a rate of 5 lbm/s by water that enters at 70°F at a rate of 3 Ibm/s. The diameter of the tube is 1 in. and the length is 20 ft. The measured overall heat transfer coefficient of this heat exchanger is 2.14 Btu/s-ft2-°F. [Oil, c, = 0.525 Btu/lbm°F, Water, c, = 1.0 %3D Btu/lbm°F] The logarithmic mean temperature difference in °C is 46.1 cannot be determined 35.0 59.4Hot water at 90°C flows on the inside of a 2.5-cm-ID steel tube with 0.8-mm wall thickness at a velocity of 4 m/s. This tube forms the inside of a double-pipe heat exchanger. The outer pipe has a 3.75-cm ID, and engine oil at 20°C flows in the annular space at a velocity of 7 m/s. Calculate the overall heat-transfer coefficient for this arrangement. The tube length is 6.0 m.
- A shell-and-tube heat exchanger is used to cool compressed liquid methanol from 176 °F to 104 °F. The methanol flows on the shell side of the exchanger. The coolant is water that rises in temperature from 50 °F to 86 °F and flows within the tubes at a rate of 68.9 kg s-1. Finding the appropriate thermophysical data and applying the proper equations, you are required to do the following:In a countercurrent double-pipe heat exchanger, the hot oil entering the inner tube at 420 K with a flow rate of 60 g/s is required to be cooled to 320 K. In the space between the outer tube and the inner tube of the heat exchanger, cooling water flows at the same linear speed as the oil. Cooling water enters the heat exchanger at 290 K. The inner tube inner diameter of the heat exchanger is 25 mm and the outer tube inner diameter is 40 mm. Calculate the length of the heat exchanger. The oil side heat transfer coefficient is 1.6 kW/m2 K, and the water side heat transfer coefficient is 3.6 kW/m2 K. The densities of oil and water can be taken as 0.8 and 1.0 g/cm3, respectively, and the specific heats of oil and water can be taken as 2.0 and 4.2 kJ/kg K, respectively. Wall effects can be neglected. Flow cross-sectional area = (PI)*D2 /4 F2In a facility, a counter-flow double-pipe heat exchanger is used to cool the fluid at a flow of 10.0 kg / s (Cp = 3.15 kJ / kgK) with an inlet temperature of 90 0C, and the surface area of the heat exchanger is As = 9 m2. The refrigerant (Cp = 4.2 kJ / kgK) enters the heat exchanger at a temperature of 10 ° C and a flow rate of 8.0 kg / h. Total heat transfer coefficient according to system data; ? = equation is given image. a) Calculate the heat transfer and heat exchanger exit temperatures.b) Existing heat exchanger is wanted to be changed. A seller offers an attractive discount to the plant authorities for two heat exchangers of the same property with a surface area of As = 5 m2. Since the pipe diameters in existing and new heat exchangers are the same, it is expected that the total heat transfer coefficient equation given above will also be valid for new heat exchangers. The vendor suggests that both heat exchangers can be operated in parallel in a counter-flow fashion, so that…