C- Hot engine oil is to be cooled in a double-tube counter-flow heat exchanger. The copper inner tubes have a diameter of 2.5 cm and negligible thickness. The inner diameter of the outer tube (the shell) is 4 cm. Water flows through the tube at a rate of 0.42 kg/s, and the oil through the shell at a rate of 0.91 kg/a. Taking the average temperatures of the water and the oil to be 52 C and 95°C, respectively, determine the overall heat transfer coefficient of this heat exchanger. Nu or Turbulent flow
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- You are designing a piping system to facilitate the transfer of water from one industrialprocess to the next. You need the water to condense from saturated vapor to saturatedliquid at a constant 1000 kPa as it flows through the piping system. The pipe is to be madeof plain carbon steel with thermal conductivity ? = 60 W m-K⁄ and inner and outer radii?? = 5 cm and ?? = 7 cm, respectively. The thermodynamic property table at the end of thisproblem will be helpful throughout your analysis.a) If the convection coefficient between the steam and inner wall of the pipe is “verylarge”, what is the temperature of the inner pipe wall along its entire length?(Hint: Isobaric phase change is also iso___?)b) The fluid surrounding the pipe has temperature ?∞ = 30°C and the convectioncoefficient from the pipe to this fluid is ℎ = 100 W/m2⋅K. What is the heat transferrate out of the pipe, per unit meter of pipe? You may neglect radiation effects. Usea thermal resistance network in your analysis.c) The…An isosceles triangle channel having an apex angle of 60 ° and length of 20 m is being heated uniformly with electric heaters. Water flows through this channel with an inlet temperature of 15 °C and mass flow rate of 1 kg/s and is 10 m being heated to 45 °C at the exit of the tube. Assuming the water flow is fully developed through the channel what is the average convection heat transfer coefficient? Also determine the pumping power. 10 m 16 mA DPHX is made of a 6-nom sch 40 commercial steel outer pipe and a 5-nomsch 40S stainless steel inner pipe. The fluid in the annular space is cyclohexanethat has a volumetric flow rate of 120 gpm and an average temperature of 60°F. The fluid in the inner tube is water at an average temperature of 180°F andflowing at 320 gpm. Cyclohexane is an organic liquid and the water can be assumed to be distilled water. The thermal conductivity of the stainless steelinner pipe is 9.5 Btu/h·ft·°F. Determine the following:a. Convective heat transfer coefficients in the inner pipe and the annulus (Btu/h·ft2·°F).b. Overall heat transfer coefficient for the case of a clean heat exchanger (Btu/h·ft2·°F).c. Overall heat transfer coefficient if fouling is considered (Btu/h·ft2·°F).
- The double pipe 1 m length heat exchanger is essentially a set of concentric pipes. One fluid flows within the smaller pipe and the other in the annulus. For such an exchanger (outer diameter of the inside pipe is 2 cm; inner diameter of the outside pipe is 4 cm), water flows in the annular space at an average velocity of 0.2 m/s. The water, which cools an organic flowing in the central pipe, has a temperature change from 16 to 28 . In this case calculate the heat transfer coefficient for the water assuming that the exchanger is heavily insulated and that the wall temperature on the inside of the annulus (outside of central pipe) is 30 . And heat transfer rate=?, heat transfer flux=?Why does the friction factor increase as the velocity decreases in a laminar flow in a pipe?Design a hydrocooling unit that can cool fruits and vegetables from 30 to 5 °C at a rate of 20,000 kg/h under the following conditions:The unit will be of the flooded type, which will cool the products when they are transported in the channel filled with water. Products will be dropped into the water filled chute at one end and collected at the other end. The channel can have a width of up to 3 m and a height of up to 90 cm. The water will circulate and be cooled by the evaporator section of a refrigeration system. The temperature of the refrigerant inside the coils will be 2°C, and the temperature of the water must not fall below 1.5°C and must not exceed 7°C.Assuming reasonable values for the average density, specific heat, and porosity of the product (the fraction of the volume of air in a box), recommend reasonable values for a) the velocity of the water through the channel and b) the flow rate refrigeration system cooling (QL). For the calculation of the reasonable values…
- Design a hydrocooling unit that can cool fruits and vegetables from 30 to 5 °C at a rate of 20,000 kg/h under the following conditions:The unit will be of the flooded type, which will cool the products when they are transported in the channel filled with water. Products will be dropped into the water filled chute at one end and collected at the other end. The channel can have a width of up to 3 m and a height of up to 90 cm. The water will circulate and be cooled by the evaporator section of a refrigeration system. The temperature of the refrigerant inside the coils will be 2°C, and the temperature of the water must not fall below 1.5°C and must not exceed 7°C.Assuming reasonable values for the average density, specific heat, and porosity of the product (the fraction of the volume of air in a box), recommend reasonable values for a) the velocity of the water through the channel and b) the flow rate refrigeration system cooling (QL). Compressor efficiency 75%. For the calculation of the…Water with a density of 1000 kgm³ is pumped through a counter flow heat exchanger mounted on a large diesel generator skid to remove heat from the generator lubricating oil. The water circuit then passes through an air-cooled coil in order to dissipate this heat. The water circuit comprises of 150 m of 50 mm diameter mild steel pipe, 25 elbows, 6 isolating valves (IV), 1 fixed orifice double regulating valve (FODRV), 1 strainer and 1 non-return valve (NRV). Pressure loss factors for the fittings are given in table Q4.1. The manufacturer of the shell and tube heat exchanger has stated that the pressure drop in the exchanger can be modelled by AP = (with the capacity factor X = 0.0008 m³s-¹Paº5. The data sheet for the air-cooled coil has limited water side pressure drop data and the only water pressure drop figure given is a constant 80 kPa. Develop the system equation for the water piping circuit and hence estimate the volumetric flow rate in the system if the pump with the operating…A condenser consists of several tubes. The outer diameter of each tube is 2 cm, and the thickness is 2 mm. It is designed to condense saturated steam that enters the condenser at the mass flow rate of 100 kg/s. The steam pressure is 10 kPa. There is 10% moisture in saturated steam. The inlet temperature of cooling water is 20°C, and the outlet temperature is 40°C. Water velocity 2 m/s. The overall heat transfer coefficient based on outer surface area is 3.5 3. kW/m2.K. The heat capacity of water is 4.2 kJ/kg.K. Water density is 1000 kg/m'. Find the number of tubes and the length of each tube.
- The hot akapkan, which enters the inner pipe of a double-pipe exchanger at a speed of 5200 kg/h at 120 °C, is desired to be cooled to 22 "C. In order to cool the hot fluid, the hot fluid is fed tap water at 15 °Dec with a speed of 10780 kg/h between the inner and tooth pipes in the opposite direction. Calculate the length of the double-pipe heat exchanger to be used as a heat exchanger in these conditions.(L?) data: D0=13.8cm Di=12cm K pipe=12w/m.k hi=22w/m^2 k. ho=36w/m^2k CP,hot=2.2 kj/kg.k , CP ,water =1.3 KJ/Kg.kWater at 40 F (p=62.42 lbm/ft and p=1.038x103 Ibm/ft-s) is flowing steadily through a 0.12-in-(%3D0.01 ft) diameter 30-ft-long horizontal pipe at an average velocity of 3 ft/s. Determine the pumping power requirement to overcome this pressure drop in Watt. ut of 1W=0.737lbf.ft/s 3.0 ft/s 0.12 In 30 ft Select one: O a. 0.6 W O b. 0.9 W Oc.0.1 W O d. 0.3 WThe water (C, = 4180 J/kg - °C) enters the 2.5-cm internal-diameter tube of a double-pipe counter-flow heat exchanger at 17°C at a rate of 3 kg/s. It is heated by steam condensing at 120°C (he = 2203 kJ/kg) in the shell. If the overall heat transfer coefficient of the heat exchanger is 1500 W/m? - °C, determine the length of the tube required in order to heat the water to 80°C. Steam 120°C Water 80°C 17°C 3 kg/s