Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Mechanical Engineering Expert

You need to select or design a heat exchanger for a waste heat recovery system in cars.

The assignment requires to be submitted in a MS Word or pdf file with 2200-2500 words limit and at least 10 references in Harvard style.

Part 1 – Heat Exchanger selection/design:

Assume that you are part of a product development team that is developing a novel waste heat recovery system to make cars more efficient. One feature 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, however as well during steady state operation at engine loads below wide open throttle. Your task is to choose and source an existing heat exchanger which will be suitable 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 new 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 able to realize the maximum possible fuel economy enhancement.

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

4) Low weight to minimize the negative impact of additional weight towards the 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 process:

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 engine components inclusive the 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 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 after the heat exchanger is to be below 90 °C throughout most parts of the NEDC to be able to utilize the condensation enthalpy of the water as much as possible.

Deliverables:

The given deliverables are needed as the outcome of your development work, independent if you selected an existing heat exchanger or if you designed your own. When some numerical values that might be needed for your calculations are not given in the assignment, you require estimating them and you need to justify such estimations. Whenever you make assumptions you need to clearly articulate the assumptions, cite the source of your assumptions and add up a comment regarding the potential effect of the uncertainty of your assumptions.

a) Material specification that will be used and material thickness.

b) Average efficiency or effectiveness.

c) Overall weight.

d) Outside dimensions.

e) Package volume.

f) Maximum average outside surface temperature throughout NEDC.

g) Maximum average inside surface temperature throughout NEDC.

h) Oil volume in the heat exchanger.

i) Heat needed to warm up the heat exchanger (a lump sum analysis is sufficient).

j) Average heat rejected to the ambient.

k) Effective heat transfer surface.

l) Layout with definition of inlet and outlet for oil and exhaust.

m) Sketch the cross section.

n) Cost (single unit prototype and  if mass generated at 100,000 units per year).

Mechanical Engineering, Engineering

  • Category:- Mechanical Engineering
  • Reference No.:- M9464

Have any Question? 


Related Questions in Mechanical Engineering

Given the result of problem 67 estimate the magnitude of

Given the result of Problem 6.7, estimate the magnitude of the radial deflection of a pressurized cylinder as a fraction of its thickness Problem 6.7: Given that the hoop strain is likely to be a very small number, estim ...

A nut having an effective length of 2 in and a 12-16 un

A nut having an effective length of 2 in. and a 1/2-16 UN thread is snug tightened and then turned 308. How much preload will that create in the bolt? Is that an acceptable preload? Describe the typical torque-turn tight ...

1 the pump shown in the figure delivers water at 59degf at

1. The pump shown in the figure delivers water at 59°F at a rate of 550 gal/min. The inlet pipe has an inside diameter of 5.95 in. and it is 10 ft long. The inlet pipe is submerged 6 ft into the water and is vertical. Es ...

I need a proposal project for surface metrology asap i need

I need a proposal project for Surface Metrology ASAP. I need two documents: 1. Project outlines Proposal outlines (the instruction & template is in the attached Proposal for the project) should be 1 page 2. Final project ...

It has been suggested that the control software for a

It has been suggested that the control software for a radiation therapy machine, used to treat patients with cancer, should be implemented using N-version programming. Comment on whether or not you think this is a good s ...

Why is a combination of torque and angle measurement or

Why is a combination of torque and angle measurement or control so popular in mass production operations? What is meant by window control? What is meant by yield control in mass production applications? Does tightening a ...

If the kansas city building code specified that a floor

If the Kansas City Building Code specified that a floor structure must support a live load of 4.79 kPa (100 psf), and if the walkway length L = 9.1 m = 30.0 ft and width b = 2 m = 6.56 ft, what contribution is made to th ...

1 gas turbine and compressed air systems will serve as

1. Gas turbine and compressed air systems will serve as prime movers at a very high speed. Discuss the design characteristics of an induction generator for those applications. 2. Explain in detail why induction generator ...

For the allen wrench of problem 715 what is the deflection

For the allen wrench of Problem 7.15, what is the deflection of the tip of the wrench when the maximum load of 60 N is applied, just before the bolt loosens? Problem 7.15: The maximum force applied to the tip of the alle ...

Two structural steel shafts with flanges forged on their

Two structural steel shafts with flanges forged on their ends are rigidly connected with a circle of bolts. The shafts are meant to rotate in their supports at A and D, however a 100 N · m torque is applied to flange B w ...

  • 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

Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro

Describe what you learned about the impact of economic

Describe what you learned about the impact of economic, social, and demographic trends affecting the US labor environmen