You as a Biochemical Engineer in an ezyme industries is assigned to handle a counterflow double pipe heat exchanger with A,= 9 m2 which used for cooling a fermentationbroth (c, = 3.15 kJ/kg. K) at a rate of 10 kg/s with an inlet temperature of 90°C. Thewater used as coolant enters the heat exchanger at a rate of 8 kg/s with an inlettemperature of 10°C. The plant data gave the following equation for the overall heattransfer coefficient (in W/m².K):600%3D12• U.8|m.wherem.and m, are the cold and hot stream flow rates in kg/s, respectively. (b) The existing unit is to be replaced. A vendor is offering a very attractive discounton two identical heat exchangers that are presently stocked in its warehouse, eachwith area of 5.5 m?Because the tube diameters in the existing and new units are the same, the aboveheat transfer coefficient equation is expected to be valid for the new units as well.The vendor is proposing that the two new units could be operated in parallel, suchthat each unit would process exactly one-half the flow rate of each of the hot andcold streams in a counterflow manner, hence, they together would meet (or exceed)the present plant heat duty. Draw a complete schematic diagram of the new heatexchangers. Suggest what should be the diameter and length. Give yourrecommendation, with supporting calculations on this replacem ent proposal.Compare perform ance of both heat exchanger.

Drawing the diagram of heat exchangers,

You as a Biochemical Engineer in an ezyme industries is assigned to handle a counter flow double pipe heat exchanger with A,= 9 m2 which used for cooling a fermentation broth (c, = 3.15 kJ/kg. K) at a rate of 10 kg/s with an inlet temperature of 90°C. The water used as coolant enters the heat exchanger at a rate of 8 kg/s with an inlet temperature of 10°C. The plant data gave the following equation for the overall heat transfer coefficient (in W/m².K):

You as a Biochemical Engineer in an ezyme industries is assigned to handle a counter flow double pipe heat exchanger with A,= 9 m2 which used for cooling a fermentation broth (c, = 3.15 kJ/kg. K) at a rate of 10 kg/s with an inlet temperature of 90°C. The water used as coolant enters the heat exchanger at a rate of 8 kg/s with an inlet temperature of 10°C. The plant data gave the following equation for the overall heat transfer coefficient (in W/m².K):

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

Diesel flows at the rate of 3 kg/sec through a double pipe counter flow heat exchanger. Diesel is heated from 60degC to 75degC by a water (cp=4.187 kJ/kg-K) flowing through the tube. The specific heat of the diesel is 1.780 kj/kg.K. The water enters at 115degC and leaves at 70degC.the overall heat transfer co-efficient is 340 W/m2K. Calculate the heat exchanger area and the rate of heat transfer.
21, from a temperature of water is beine heated 85.1°F to a Aaturated temperatue of 211.4 °F at pressure of 0.101325 mpausing a 2-4 shell and tube heat exchanger. The inlet water mass flow rate =600 kg /min. The heat transfer oil being used is assumed to be stable mineral oil enters at 320 °F, highly refined and with average heat mass flow rate = 148 2 kg /min 0.4498 btu I 16°F capacity Overall heat transfer coefficient 113.3973 btu toztty fina: heeded surface area
Can you please give me an analysis of heat tranfers in heat exchangers?
in a 10-m long center-current flow tubular heat exchanger, a liquid food, flowing in the inner pipe (inside diameter 5 cm), is heated from 4 to 60 C for pasteurization. In the outer tube (diameter 10 cm), hot water enters at 95 C and exits at 80 C. A) If the mass flow rate of the hot water is 5 kg/s, what is the flow rate of the pasteurized product? The specific heat of the water is 4.2 kJ/(kg C), specific heat of product is 3.8 kJ/(kg C) B) what is the log mean temperature difference C) What is the overall heat transfer coefficient for the heat exchanger based on the outside surface?
(1) A counterflow, concentric tube heat exchanger is used to cool the lubricating oil for a large industrial gas turbine engine. The flow rate of cooling water through the inner tube (Di = 20 mm) is 0.5 kg/s, while the flow rate of oil through the outer tube (Do = 45 mm) is 0.3 kg/s. The oil and water enter at temperatures of 100 and 30°C, respectively. A) What is the main difference between parallel and counter flow heat exchangers? B) How long must the tube be made if the outlet temperature of the oil is 60°C? C) If the heat exchanger is changed to parallel flow heat exchanger, how long must the tube be made if the outlet temperature of the oil is 60°C?
The purpose of the regenerative heat exchanger is to essentially recycle the heat rejected in step (B) as heat absorbed in step (D). Show why this works for the case of a general working fluid with heat capacity, Cv(T). The Stirling engine (invented in 1816 by Robert Stirling) is a heat engine that produces work through cyclic compression and expansion of a gaseous working fluid, such as hot air. An idealized cyclic process, aptly named the Stirling Cycle, for such an engine consists of four steps: (A) isothermal expansion at the hot reservoir temperature, Th, (B) isochoric (constant volume) heat rejection to a regenerative heat exchanger, (C) isothermal compression at the cold reservioir temperature Te, and (D) isochoric heat absorption from the regenerative heat exchanger back to the initial state.
3.36 Both C's in a parallel-flow heat exchanger are equal to 156 W/K, U 327 W/m²K and A = 2 m². The hot fluid enters at 140°C and leaves at 90°C. The cold fluid enters at 40°C. If both C's are halved, what will be the exit temperature of the hot fluid?
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;
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
FLUIO HEATER HEATS 250 kg PER SECOND OF FLUID FROM 35°C TO 100't IN A PARALLEL FLOW HEAT EXCHANGER.THE SPECIFIC HEAT OF THIS FLUID 1s 2.5 kg °C ANEXHAUST GAS WAS USED.FOR HEATING HAVING A SPECIFIC HEAT OF 1 gC, A MASS FLOW RATE OF 625 ks AND AN INITIAL TEMPERATURE OF 200°C THE OVERALL HEAT TRANSFER COEFTICIENT IS 7.5 kw /m2. C.ETERMINE THE FOLLOWING: ) FINAL TEMPERATURE IN °C 2.) AMTD 3) SURFAC E HEAT TRANSFER 4.) HEATING SURFACE IN m2 OTE GAFLUID = QRGAS = HEAT TRANSFERRED TO THE SURFACE SE HEAT CALCULATION FRUM THER Mo 1 AND AMTD FOR THE SURFACE HEAT TRANSFER.