2. In the counter flow heat exchanger, the water at 20°C is used to cool the liquid from 80°C to 30°C, and the volumetric flow rate of the liquid is 5.3m³/h, the specific heat of the liquid is 1.9kJ/ (kg. C), its density is 850kg/m³. The pipe diameter of the exchanger is $25×2.5mm., and the water flows in the tube-side. The individual heat transfer coefficients of the water-side and the liquid-side are 0.85kW/ (m². C) and 1.70kW/(m². C), respectively. The thermal conductivity km of the pipe is 45W/(m. C). Neglecting the scale resistance of pipe wall. If the outlet temperature of the water cannot be over 50°C, calculate the heat transfer surface area of the exchanger.<

2. In the counter flow heat exchanger, the water at 20°C is used to cool the liquid from 80°C to 30°C, and the volumetric flow rate of the liquid is 5.3m³/h, the specific heat of the liquid is 1.9kJ/ (kg. C), its density is 850kg/m³. The pipe diameter of the exchanger is $25×2.5mm., and the water flows in the tube-side. The individual heat transfer coefficients of the water-side and the liquid-side are 0.85kW/ (m². C) and 1.70kW/(m². C), respectively. The thermal conductivity km of the pipe is 45W/(m. C). Neglecting the scale resistance of pipe wall. If the outlet temperature of the water cannot be over 50°C, calculate the heat transfer surface area of the exchanger.<

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter10: Heat Exchangers

Section: Chapter Questions

Problem 10.32P

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4. The following heat exchanger uses 10 kg/s of hot air to heat and boil liquid water into saturated steam at 500 kPa. (a) Find the steam flow (kg/s) (b) Determine whether the process is allowed by the second law (Answer: It is not!) (c) On the surface, the process looks OK as Tair>Twater at both the inlet and outlet. You should be able to see the problem if you sketch the air and the water temperature profiles as you move left to right through the exchanger. (Hints: The air will be essentially a straight line, while the water will not. For the water, think about what happens when it is changing phase.) This is called a pinch point violation, and it is a very important design consideration in advanced combined cycle systems and in nuclear power plants. Air 100 kPa 160°C 10 kg/s Saturated Vapor 500 kPa Air: 160°C Steam: 151.8°C Q Air 100 kPa 30°C Liquid Water 500 kPa, 20°C Air: 30°C Water: 20°C
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Liquid water is heated inside the tubes of a shell and tube heat exchanger as shown in the figure below. The inlet temperature is 30 °C and the outlet temperature is 50 °C. The tube inside and outside diamters are 16 mm and 18 mm respectively. The mass flow rate in each tube is 0.25 kg/s. Refrigerant Gas Water Out Water In Refrigerant Liquid Estimate: a) The average velocity in each tube: b) The Reynolds number in each tube: c) The Nusselt Number of the flow inside each of the tubes: m/s
The clean U for an exchanger is 770 BTU/(hr 0 F ft2). Its tube area is 550 ft2. After operating for several months, it is heating water from 40 0F to 150 0F at a flow rate of 200 GPM with a heating fluid on the shell entering at 300 0F and exiting at 170 0 F. Has the overall U decreased significantly? how many 1.0 inch diameter, 20 ft long tubes would it take to equal the 550 ft2 area?
he shell fluid,ethylene glycol, enters at 120oC and leaves at 60oCwitha flow rate of 4000 kg/h. Water flows in the tubes, entering at 35oCand leaving at85oC. The overall heat-transfer coefficient for this arrangement is 900W/m2·oC.The exchanger is a shell tube with two shell passes and two tube passes.Calculate the following: a) The water exit temperature if flow rate of glycol to the exchanger is reduced in half with the entrance temperatures of both fluids remaining the same and by how much is the heat-transfer rate reduced?; b) The percentage reduction of heat transfer if water-flow rate is reduced by 25percent,while the gas flowrate is maintained constant along with the fluid inlet temperatures. Assume that the overall heat-transfer coefficient remains the same; andc) The flow rate of water required andthe area of the heat exchanger;
A heat exchanger is heating water on the tube side with steam condensing on the shell side. The water is entering at 45 0 F and exiting at 175 0 F. No instruments are available for measuring the tube side water flow but condensed steam from the shell side is being collected at a rate of 43 GPM. If the tube area of the exchanger is 350 Ft2 , and the overall heat transfer coefficient clean was 900 BTU/Hr.Ft2 F0, how much has the overall heat transfer coefficient changed, if at all? Note: Latent heat for water/steam at 212 0 F is 970 BTU per pound of water. A gallon of water weighs 8.34 lbs.
A heat exchanger is heating water from 50 0 F to 160 0 F using steam on the shell at atmospheric pressure condensing at 212 0 F. If the overall U is 710 BTU/(hr 0 F ft2) and the exchange rate is 9,000,000 BTU/hr, what tube area is needed?
SEMIFINAL PROJECT IN ME 3215 COMBUSTION ENGINEERING PROBLEM: Cooling water for 507 Horsepower Diesel Engine is to be cooled by using an intermediate cooling heat exchanger as follows. At Counterflow Heat exchanger. Jacket water in --- 60 °C Jacket water out 38 °C Tower water in 27 °C Tower water out - -54 °C To be done: Make the necessary valid assumptions and calculate the flow through heat exchanger for the following quantities: kg 1. Jacket water, in sec kg 2. Tower water, in sec to coling o NEAT EXCNANGER DESEL ENGE from cool
heated from 50 C to 75 C by an oil flowing through the tube.. The oil enters at 115 °C and leaves at 70 °C. The overall heat transfer co-efficient is 340 W/m²K. Water flows at the rate of 65 kg/min through a double pipe counter flow heat exchanger. Water is (Specific heat of water is 4186 J/kg. C, and the specific heat of the oil is 1780 j/kg. °C). calculate the following: 1. Heat exchanger area 2. Rate of heat transfer 3. Mass flow rate of oil
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To cool the lubricating oil, a concentric counter-flow heat exchanger (see Figure Q1) is utilized,with the water flowing via an internal pipe with an internal diameter of 0.02 m and a flow rate of0.18 kg/s. The intake and output oil temperatures are 95ºC and 65ºC, respectively, as the oil runs through the outer annulus (0.04 m) at a flow rate of 0.12 kg/s. The water enters the heat exchangerat a temperature of 30ºC.Stating all the necessary assumptions (a) determine required length of the pipe (b) Considering the effect of fouling during operation through time and the heat transferresistance would be affected, discuss the design and operation considerations to minimizethe fouling problem on the opertion of the heat exchanger during design and operationstages. Consider average value of Engine oil property: Cp=2131 J/kgoC; μ=0.0325 Ns/m2; K=0.138W/moCConsider average value of water properties: Cp=4174 J/kgoC; μ=725x 10-6 Ns/m2; K=0.138W/moC; Pr=4.85
Table Q3 is given to collect the temperature of hot and cold water at the inlet and outlet positions in the laboratory using Tube Heat Exchanger (TD360a) by varying the cold-water flow rate to investigate the effect of cold-water flow rate on the heat exchanger’s performance. (a) Complete all the output parameters indicated in the table given in Appendix 1. (b) Draw the temperature (TH1, TH2, TC1 and TC2) on the vertical vs position (1, 2) on the horizontal axis for each flow and discuss the effect of cold water flow rate change on the exit temperature of both cold water and hot water. (c) Draw the graph of Energy Balance Coefficient and Mean Temperature Efficiency on vertical axis and cold-water flow rate on horizontal axis. Discuss the effect of flow rate on the Energy Balance Coefficient and Mean Temperature Efficiency based on your finding.