Ask Question, Ask an Expert


Ask Mechanical Engineering Expert

This assignment comprises of 2 different elements. In the first portion you need to choose or design a heat exchanger for a waste heat recovery system in cars. The second portion is a reflective journal regarding the unit, a bit similar to the SETU problemnaire however mandatory to capture the thoughts of all students.

The assignment requires to be submitted through CloudDeakin as a MS Word or pdf file.

Heat Exchanger selection/design:

Suppose you are part of a product development team which is developing a novel waste heat recovery system to make cars more efficient. One of the features of the system is to transfers wasted exhaust heat to the engine oil through a heat exchanger to decrease the friction of the oil, particularly during warm up, but as well during steady state operation at engine loads below wide open throttle. Your task is to either design or choose and source an existing heat exchanger which will be appropriate for this application. Even although most driving patterns in a car are highly dynamic you are given most operating conditions as average over the legal fuel consumption drive cycle. In the assignment you require to justify the decisions based on you engineering judgment and by applying the concepts you learned in the heat transfer unit.

The priorities for the latest product are as shown below:

1) Safe operation beneath all possible operating conditions at ambient temperatures between -30 °C and +50 °C

2) Maximum efficiency of the heat exchanger to be capable to realize the highest possible fuel economy improvement

3) The durability of 150,000km (legal necessity for emission relevant components).

4) Low weight to minimize the negative impact of additional weight towards fuel economy.

5) Small external volume to make it simple to package it in the packed and tight engine compartment.

6) Low cost.

7) Low external temperatures to avoid deterioration, aging or long term damage of close by plastic components.

8) Long term resistance against the fouling.

Operating conditions:

The given operating conditions must be considered in your selection or design procedure:

a) The test condition is the New European Drive Cycle (NEDC), the duration is 1180 sec.

b) The exhaust gas comprises of corrosive combustion products. The average water content is around 10%

c) The average exhaust temperature to the heat exchanger is 434 °C throughout the NEDC.

d) The maximum exhaust gas temperature is 625 °C throughout the NEDC.

e) The ambient air temperature is 24 °C throughout the NEDC; this doesn’t change over the test cycle.

f) The start temperature of all the engine components inclusive exhaust gas heat exchanger and the engine oil is as well 24 °C

g) The average flow rate of exhaust gas is 6.9 g/s.

h) The average oil flow rate is 10 l/min.

i) The average oil temperature is around 60 °C.

j) The average vehicle speed is 35km/h, the wind speed is simulated proportionally to the vehicle speed through a vehicle cooling fan.

k) The average exhaust heat flow throughout the NEDC is 4kW.

l) The target exhaust gas temperature subsequent to the heat exchanger is to be beneath 90 °C throughout most parts of the NEDC to be able to utilize the condensation enthalpy of the water as much as possible.

Mechanical Engineering, Engineering

  • Category:- Mechanical Engineering
  • Reference No.:- M9115

Have any Question? 

Related Questions in Mechanical Engineering

A flywheel is retained on a shaft by five bolts which are

A flywheel is retained on a shaft by five bolts, which are each tightened to a specified torque of 50 ± 5 Nm. A sample of 20 assemblies was checked for bolt torque. The results from the 100 bolts had a mean of 47.2Nm and ...

Air having a specific weight of 00795 lbft3 flows into the

Air having a specific weight of 0.0795 lb/ft3 flows into the duct at A with an average velocity of 5ft/s. if its density at B is 0.00206 slug/ft3, determine its velocity at B Image for Air having a specific weight of 0.0 ...

A constant 10 v is suddenly applied to coil 1 of the

A constant 10 V is suddenly applied to coil 1 of the coupled circuits given in Problem 3. Coil 2 is short-circuited. Calculate the transient and steady-state current flowing in each coil. Problem 3 Two coupled coils have ...

Figure p71 shows a schematic diagram of a stepper motor

Figure P7.1 shows a schematic diagram of a stepper motor. What type of stepper is this? Describe the operation of this motor. In particular, discuss whether four separate phases are needed or whether the phases of the op ...

The duty ratio of a transistor switch used in a power width

The duty ratio of a transistor switch used in a power width modulation (PWM) amplifier is d. If the output voltage level (high) of the amplifier is vref (the low level of the output = 0), what is the average voltage supp ...

General description-you have been tasked to design a new

General Description- You have been tasked to design a new shell-and-tube heat exchanger for the chemical plant in which you work. The heat exchanger will utilize cooling water to cool Syltherm 800 (a heat transfer ?uid). ...

Football coach ira blooper has just been fired as head

Football coach Ira Blooper has just been fired as head coach at a large university. His buyout amount is $7.5 million, and Blooper will be repaid (as per his contract) in monthly installments over the next 4 years. If th ...

Conductor wall losses a rectangular waveguide is made of

Conductor (wall) losses. A rectangular waveguide is made of aluminum, which has conductivity of 3.6 x 107 S/m. The walls of the waveguide are thick and the internal dimensions are a = 25.4 mm and b = 38.1 mm. Assuming th ...

The pulses generated by the coding disk of an incremental

The pulses generated by the coding disk of an incremental optical encoder are approximately triangular (actually, upward shifted sinusoidal) in shape. Explain the reason for this. Describe a method for converting these t ...

Your schools team has reached the national championship

Your school's team has reached the national championship. Tickets are very difficult to get but you and some friends have managed to get some. You all travel a great distance to the site of the game. The excitement build ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

A cola-dispensing machine is set to dispense 9 ounces of

A cola-dispensing machine is set to dispense 9 ounces of cola per cup, with a standard deviation of 1.0 ounce. The manuf

What is marketingbullwhat is marketing think back to your

What is Marketing? • "What is marketing"? Think back to your impressions before you started this class versus how you

Question -your client david smith runs a small it

QUESTION - Your client, David Smith runs a small IT consulting business specialising in computer software and techno

Inspection of a random sample of 22 aircraft showed that 15

Inspection of a random sample of 22 aircraft showed that 15 needed repairs to fix a wiring problem that might compromise

Effective hrmquestionhow can an effective hrm system help

Effective HRM Question How can an effective HRM system help facilitate the achievement of an organization's strate