What effect do finned surfaces have on the overall heat transfer coefficientand hence the performance of a heat exchanger? When is the use of fins mostappropriate?
Q: 1. A double-pipe parallel-flow heat exchanger is used to heat cold tap water with hot water. Hot…
A: Given details: Cp=4.25 kJ/kg-kTout=85°CTin=50°Cm=1.4 kg/secU=1150 W/m2kAi=4 m2
Q: Glycerin (cp = 2400 J/kg·K) at 20°C and 0.5 kg/s is to be heated by ethylene glycol (cp = 2500…
A: Given Data: The specific heat glycerin is: cP-G=2400 J/kg K The specific heat of Ethylene glycol…
Q: A 1-shell-pass and 8-tube-passes heat exchanger is used to heat glycerin (cp = 0.60 Btu/lbm·°F) from…
A: Given data as per question No. of tubes = 8 cp of glycerin= 0.60 Btu/lbm·°F Diameter = 0.5 in…
Q: The diameter of the tube is 25 mm. The specific heat of water is 4.18 kJ/kg.°C. The overall heat…
A: There is a coma in mass flow rate data instead of point. I am considering it as 1.8 kg/s. If it is…
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: The flow rate of hot and cold-water streams running through a parallel flow heat exchanger are 0.19…
A: Given Data Mass flow rate of hot water is : m˙h=0.19 kg/s Mass flow rate of cold water is :…
Q: A counter-flow double pipe heat exchanger shown in the figure below is to heat water from 20°C to…
A: Given: Inlet temperature of hot water (Th,i)=160°C Inlet temperature of cold water (Tc,i)=20°C…
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: Consider a heat exchanger that has an NTU of 0.1. Someone proposes to triple the size of the heat…
A: The grouping of the terms UA/Cmin (where U is overall heat transfer coefficient, A is the surface…
Q: Q 3.1: What effect do finned surfaces have on the overall heat transfer coefficient and hence the…
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Q: To cool the lubricating oil, a concentric counter-flow heat exchanger (see Figure Q1) is utilized,…
A: Solution: Assumptions: There is no Fouling Resistance must be low in heat exchanger Tube wall is…
Q: Water is heated from 80°C to 150°C in a shell and tube heat exchanger with a total surface area of…
A:
Q: a) Calculate the log-mean-temperature difference and value of overall heat transfer coefficient from…
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Q: Consider a double-pipe counter-flow heat exchanger. In order to enhance heat transfer, the length of…
A: The effectiveness of the heat exchanger mainly depends on the Number of Transfer Units (NTU). The…
Q: In a large air-conditioning application, 1500 m3/min of air at 1 atm and 10◦C are to be heated in a…
A:
Q: Consider a water-to-water double-pipe heat exchanger whose flow arrangement is not known. The…
A: Draw the figure of parallel flow arrangement. From the figure, the heat flows from cold water to…
Q: Hot water at 60°C is cooled to 36°C through the tube side of a one-shell pass and two-tube passes…
A: It is required to determine the logarithmic mean temperature difference for counter flow. The…
Q: Water flows through a shower head steadily at a rate of 8 kg/min. The water is heated in an electric…
A: Write the given information.
Q: To cool the lubricating oil, a concentric counter-flow heat exchanger (see Figure Q1) is utilized,…
A:
Q: Oil in an engine is being cooled by air in a crossflow heat exchanger, where both fluids are…
A: given data as per question
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 body-and-tube heat exchanger with 2 shells and 8 tubes is used to heat ethyl alcohol…
A:
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…
Q: Is a car radiator a heat exchanger? If yes, then which type of heat exchanger is this?
A: Yes, a car radiator is a heat exchanger. It is used to transfer thermal energy from one place to…
Q: A shell-and-tube heat exchanger with 1-shell pass and 20-tube passes is used to heat glycerin (Cp =…
A:
Q: Hot oil is to be cooled in a double-tube counter-flow heat exchanger. The copper inner tubes have a…
A: Given that, Writing the Properties of water and oil as follows –
Q: Consider a double-pipe parallel-flow heat exchanger of length L. The inner and outer diameters of…
A: Here it is given :
Q: A counter-flow double pipe heat exchanger shown in the figure below is to heat water from 20°C to…
A: Given-
Q: In a textile manufacturing plant, the waste dyeing water (cp = 4295 J/kg·K) at 75°C is to be used to…
A: Write the formula for temperature difference between the fluids at hot waste dyeing water inlet for…
Q: Question 3.1:Whatt effect do finned surfaces have on the overall heat transfer coefficient and hence…
A: A fin is an extended surface from an object that has the only purpose is to increase the surface…
Q: A shell-and-tube heat exchanger is used to cool hot water by cold water. The heat exchanger has one…
A: We have to solve above question
Q: Water at the rate of 4.0 kg/s is heated from 40.0 to 60.0 °C in a shell-and-tube heat exchanger. On…
A: Given: The mass flow rate of cold water, mw = 4 kg/s The initial temperature of cold water, Tc1 = 40…
Q: A mathematical expression for the overall heat transfer rate of a cross section exchanger in…
A: Formula Of Cross Flow Heat Exchanger Is Used
Q: Calculate the rate of overall heat transfer coefficient for the tube heat exchanger with inner and…
A: Given Data: The diameter of the tube, d=4 cm The thickness of the tube, t=1.5 mm
Q: 1. A thin-walled double pipe, counter-flow heat exchanger is to be used to cool oil (Cp = 2.2…
A: Answer: The overall heat transfer coefficient is 287.6956 W/m2•℃.
Q: Q1. A long thin-walled double-pipe heat exchanger with tube and shell diameters of 2 cm and 4 cm,…
A:
Q: A counter-flow double pipe heat exchanger shown in the figure below is to heat water from 20°C to…
A: Given, The inlet and outlet temperature of the water, The inlet temperature of the geothermal…
Q: In a double-pipe, counter-flow heat exchanger, water entering at 1 kg/s is heated from 23°C to 69°C…
A: For solution refer below images.
Q: Oil at a rate of 0.8 kg/sec enter a shell and tube counter flow heat exchanger at 150°C and leaves…
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Q: In a double-pipe, counter-flow heat exchanger, water entering at 1 kg/s is heated from 23°C to 69°C…
A:
Q: water flows through a long copper tube (inside diameter 2.2 cm) with an average velocity of 2.13…
A:
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: How would you formulate this problem to obtain a more meaningful result which desired to cool a gas…
A: Given: Cp of gas = 0.35Btu/lb F Temperature of hot fluid in (Thi)=190F Temperature of hot fluid out…
Q: Show that the temperature profile of two fluid streams (hot and cold) that have the same heat…
A:
Q: To cool the lubricating oil, a concentric counter-flow heat exchanger (see Figure Q1) is utilized,…
A:
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.
3.1What effect do finned surfaces have on the overall heat transfer coefficientand hence the performance of a heat exchanger? When is the use of fins mostappropriate?
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- Determine the rate of heat transfer per meter length to a light oil flowing through a 2.5-cm-ID, 60-cm-long copper tube at a velocity of 0.03 m/s. The oil enters the tube at 16C, and the tube is heated by steam condensing on its outer surface at atmospheric pressure with a heat transfer coefficient of 11.3 kW/m K. The properties of the oil at various temperatures are listed in the following table: Temperature, T(C) 15 30 40 65 100 (kg/m3) 912 912 896 880 864 c(kJ/kgK) 1.80 1.84 1.925 2.0 2.135 k(W/mK) 0.133 0.133 0.131 0.129 0.128 (kg/ms) 0.089 0.0414 0.023 0.00786 0.0033 Pr 1204 573 338 122 552.46 The wall of a liquid-to-gas heat exchanger has a surface area on the liquid side of with a heat transfer coefficient of . On the other side of the heat exchanger wall flows a gas, and the wall has 96 thin rectangular steel fins 0.5 cm thick and 1.25 cm high as shown in the accompanying sketch. The fins are 3 m long and the heat transfer coefficient on the gas side is . Assuming that the thermal resistance of the wall is negligible, determine the rate of heat transfer if the overall temperature difference is .Question 3.1:Whatt effect do finned surfaces have on the overall heat transfer coefficient and hence the performance of a heat exchanger? When is the use of fins most appropriate? (
- Calculate the rate of overall heat transfer coefficient for the tube heat exchanger withinner and outer heat transfer coefficient of 670 W/m2 -K and 1880 W/m2 -K, respectively.Thermal conductivity of the tube wall is 27 W/m-K. The diameter and the thickness of thetube are 4 cm and 1.5 mm, respectively. Then, calculate the rate of heat transfer for the tube heatexchanger per meter length if the temperatures of inner and outer surfaces are 100°Cand 52°C, respectively.EXAMPLE 3 Consider the heat exchanger finned-tube, cross-flow heat exchanger with a gas-side overall heat transfer coefficient and area of 100 W/m² · K and 40 m², respectively. The water flow rate and inlet temperature remain at 1 kg/s and 35C. However, a change in operating conditions for the hot gas generator causes the gases to now enter the heat exchanger with a flow rate of 1.5 kg/s and a temperature of 250C. What is the rate of heat transfer by the exchanger, and what are the gas and water outlet temperatures? that is, a 1² .Your second customer wants to choose a parallel-flow-plate-type heat exchanger that contains two fluids (oil and water) separated by a thin metal sheet as shown in figure 1 for cooling the lubricating oil. The heat exchanger is insulated by a 130-mm glass fiber insulation (paper faced, 28 kg/m3 ). The heat transfer coefficients of water and oil are 1200 and 900 W/m2 °C, respectively. Figure 1: A parallel-flow-plate-type heat exchanger. Your task to help your costumer by doing the following steps: STEP 1 The flow rate of cooling water is 0.2 kg/s, and the flow rate of oil the is 0.1 kg/s. Also, the oil and water enter at temperatures of 100 and 30°C, respectively, and the outlet temperature of the oil is 40°C. If the top surface of the heat exchanger is exposed to an atmospheric air (T=10°C) that is parallel to the flows and maintains a heat transfer coefficient of h = 70 W/m2 .K, which includes the effects of radiation, help your customer to calculate the heat…
- Fill in the blanks: A double-pipe heat exchanger is constructed of a copper (k = 380 W/m-°C) inner tube of internal diameter D; = 1.2 cm and external diameter D, = 1.6 cm and an outer tube of diameter 3.0 cm. The convection heat transfer coefficient is reported to be h; = 700 W/m4-°C on the inner surface of the tube and ho = 1400 W/m-C on its outer surface. For a fouling factor Re = 0.0005 m2.°C/W on the tube side and Rfo = 0.0002 m2-°C/W on the shell side, determine the overall heat transfer coefficient based on the inner surface area of the tube. W/m2KA heat exchanger has an over-all coefficient of heat transfer of 900 W/m2-K. The mean temperature difference is 20C and heat loss is 15,000 W. Calculate the heat transfer area. Group of answer choices 0.765 ?2 0.557 ?2 0.833 ?2 0.712 ?2a one shell and two tube pass heat exchanger, coolant enters the tube at 4.81 kg/s (spread over 72 tubes with each tube being 0.01 m in diameter and 1.95 m length) at an initial temperature of 25 C. Water enters the shell at 2.5 kg/s at an initial temperature of 5 C. The average convection coefficient of the water is known to be 1e4 W/m2.K. What is the overall heat transfer coefficient, assuming no fouling, negligible tube thermal resistance and near-identical inner and outer tube surfaces? What is the actual heat transfer rate? What is the coolant outlet temperature? The coolant properties are Cp = 1040 J/kg.K, μ = 7.65e-4 kg/s.m, k = 0.058 W/m.K and Pr = 14. Assume the water Cp = 4200 J/kg.K.
- What effect do finned surfaces have on the overall heat transfer coefficientand hence the performance of a heat exchanger? When is the use of fins mostappropriate?1Single-shell heat exchanger with two tube passes, water at 30°Cis used to cool 10 kg/s of nitrogen at 200°C at atmospheric pressure. Determine thenumber of tubes needed to cool the gas down to 90∘C while raising the temperature ofwater to 60°C using a 2 m long tube of 2 cm diameter. The overall heat transfer coefficientis 100 W/m#⋅ K. The values of specific heat for nitrogen and water are, 1045 J/kg ⋅ K and4180 J/kg ⋅ K,A heat exchanger has a hot gas temperature of 300 degrees Celsius and surface conductance on hot side is 200 W/m2-K. If heat is transmitted at 1000 W/m2, what is the surface temperature on the wall at the hot side?