# Design a basic heat exchanger in counter flow

Páginas: 14 (3374 palabras) Publicado: 29 de marzo de 2011
Project:

Design a Basic Heat Exchanger in Counter Flow

Abstract
The objectives for this project are design a basics heat exchanger with counter flow and applied the concepts learned in class. It was observed that the heat exchanger was capable to decrease the hot water temperature on the exit a temperature average of 11.24ºC at trial # 1, on the trial # 2 the temperature decrease6.96ºC and the trial # 3 the temperature decrease 11.96ºC.
In this project it was used a concentric heat exchanger. It was applied several formulas to determine the different unknowns variables to design the heat exchanger. As a final step, the heat exchanger was designed and tested. The experimental results were close with the theorical values except the mass flow rate of the cold water with62.0% of error. The percent of error on the qh was 1.0% and the qc was 5.18% of error.

| Page |
1. Introduction ……………………………………………………………………….. | 5 |
2. Definition of Problem …………………………………………………………….. | 6 |
3. Governing Equation ………………………………………………………………. | 7 |
3.1 Equations ……………………………………………………………………… | 7 |
3.2 List of Symbols ……………………………………………………………….. | 8|
3.3 Calculation …………………………………………………………………… | 9 |
4. Results …………………………………………………………………………….. | 17 |
4.1 Experimental Data …………………………………………………………….. | 17 |
4.2 Theorical Data ……………………………………………………………….... | 20 |
5. Discussion …………………………………………………………………………. | 21 |
6. Conclusion ………………………………………………………………………… | 22 |
7. Reference …………………………………………………………………………..| 23 |
8. Appendix ………………………………………………………………………….. | 24 |
8.1 LabView VI …………………………………………………………………… | 24 |
8.2 LabView Raw Data ………………………………………………………….... | 25 |
8.3 Pictures ………………………………………………………………………. | 26 |
8.3.1 Under Construction ……………………………………………………... | 26 |
8.3.2 Calibrating Thermocouple ……………………………………………… | 27 |8.3.3 Measuring Velocity …………………………………………………….. | 28 |
8.3.4 Measuring Temperature ………………………………………………… | 28 |
8.3.5 Final Design …………………………………………………………….. | 29 |
8.4 Hand Writing Calculation ……………………………………………………… | 30 |
List of Figure | |
| Page |
Figure # 1: Design to evaluate …………………………………………………………… | 6 |
Figure # 2: Heat ExchangerExperimental ……………………………………………….. | 14 |
Figure # 3: Graphic of First Test ………………………………………………………… | 17 |
Figure # 4: Graphic of Second test ………………………………………………………. | 18 |
Figure # 5: Graphic of third Test ………………………………………………………… | 20 |
Figure # 6: Front Panel ofLabVIEW Program …………………………………………... | 24 |
Figure # 7: Block Diagram of LabVIEW Program ………………………………………. | 24 |

List of Tables | |
| Page |
Table # 1: Equations ……………………………………………………………………… | 7 |
Table # 2: List of Symbol ………………………………………………………………… | 8 |
Table # 3: First Test of the Heat Exchanger ……………………………………………… | 17 |
Table # 4: Second Test of the Heat Exchanger …………………………………………...| 18 |
Table # 5: Third Test of the Heat Exchanger …………………………………………….. | 19 |
Table # 6: Theorical data ………………………………………………………………… | 20 |
Table # 7: Comparative table ……………………………………………………………. | 21 |

1. Introduction
The heat exchangers are devices that facilitate heat exchange between two fluids and separated the fluids with a solid wall. This device is used in our daily life andhas many applications like: air conditioners, refrigerators, heaters, automobiles and production power plants. There are various types of heat exchangers and can be classified according to flow arrangement or the type of construction. Some types are: double pipe or concentric tube heat exchanger, cross-flow heat exchanger, shell tube heat exchanger and compact heat exchanger. [2]
To...

Regístrate para leer el documento completo.