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The effect of varying flow rate-counter flow shell and tube heat exchanger
1. Heat Transfer Laboratory
E n g . H a y m e n F . F a t t a h
E x p e r i m e n t N o . 7 Page 1
EXPERIMENT NO. 7
((The effect of varying flow rate-counter flow shell and tube heat exchanger))
Aim:
To show how different cold flow rates affect the performance of the heat exchanger in counter
flow connection.
1. Theory & procedure
1.1 Heat transfer, energy balance and efficiency
In heat exchangers, heat transfers or flows from the hot water circuit to the cold-water circuit. The
heat transfer rate is a function of the fluid mass flow rate, the temperature change and the specific
heat capacity of the fluid (at mean temperature).
m Cp ΔT (1)
In an ideal heat exchanger, that does not lose or absorb heat from its surroundings, the cool fluid
absorbs all the heat from the hot fluid [1-4]
. So, the heat transfer rate is:
= mH CpH ΔTH = mc Cpc ΔTc (2)
Fig. 1 Counter flow scheme
2. Heat Transfer Laboratory
E n g . H a y m e n F . F a t t a h
E x p e r i m e n t N o . 7 Page 2
Table 1 Notation
3. Heat Transfer Laboratory
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Fig. 2 Specific heat capacity of water at constant pressure [1]
Fig. 3 Water density [1]
4. Heat Transfer Laboratory
E n g . H a y m e n F . F a t t a h
E x p e r i m e n t N o . 7 Page 4
2. Reading table & calculation Table 2 Reading table
10 L.min-1
= 0.0001667 m3
.s-1
∆TH = TH1 - TH2 (3)
∆TC = TC2 - TC1 (4)
Mean heat transfer area = 0.02 m2
Overall heat transfer coefficient:
(5)
Temperature efficiency:
(6)
(7)
(8)
(9)
(10)
(11)
5. Heat Transfer Laboratory
E n g . H a y m e n F . F a t t a h
E x p e r i m e n t N o . 7 Page 5
3. Discussion questions
a) Why we get different mean temperature efficiency?
b) Draw a simple temperature chart for each condition.
c) Discuss the effects of the flow rate on the rate of heat transfer.
d) Why we have errors?
Fig. 4 Shell and tube – Counter flow heat exchanger apparatus [1]
References
1. TecQuipment Ltd, Shell and tube heat exchanger apparatus, Model: VDAS-F TD360C.
2. Мохамед Б, Кароли Я, Зеленцов А.А. (2020) Трехмерное моделирование течения газа
во впускной системе автомобиля «формулы студент» Журнал Сибирского
федерального университета, 13(5); pp. 597-610. https://doi.org/10.17516/1999-494X-
0249.
3. Mohamad B., Karoly J., Zelentsov A.A. (2020) Hangtompító akusztikai tervezése hibrid
módszerrel, Multidiszciplináris Tudományok, 9(4), pp. 548-555.
https://doi.org/10.35925/j.multi.2019.4.58.
4. Yunus Cengel, Heat Transfer: A Practical Approach, 2nd
ed., McGraw-Hill Education –
Europe, 1997.
Barhm Abdullah Mohamad
Erbil Polytechnic University
LinkedIn: https://www.linkedin.com/in/barhm-mohamad-900b1b138/
Google Scholar: https://scholar.google.com/citations?user=KRQ96qgAAAAJ&hl=en
ResearchGate: https://www.researchgate.net/profile/Barhm_Mohamad
YouTube channel: https://www.youtube.com/channel/UC16-u0i4mxe6TmAUQH0kmNw
![Heat Transfer Laboratory
E n g . H a y m e n F . F a t t a h
E x p e r i m e n t N o . 7 Page 1
EXPERIMENT NO. 7
((The effect of varying flow rate-counter flow shell and tube heat exchanger))
Aim:
To show how different cold flow rates affect the performance of the heat exchanger in counter
flow connection.
1. Theory & procedure
1.1 Heat transfer, energy balance and efficiency
In heat exchangers, heat transfers or flows from the hot water circuit to the cold-water circuit. The
heat transfer rate is a function of the fluid mass flow rate, the temperature change and the specific
heat capacity of the fluid (at mean temperature).
m Cp ΔT (1)
In an ideal heat exchanger, that does not lose or absorb heat from its surroundings, the cool fluid
absorbs all the heat from the hot fluid [1-4]
. So, the heat transfer rate is:
= mH CpH ΔTH = mc Cpc ΔTc (2)
Fig. 1 Counter flow scheme](https://image.slidesharecdn.com/laboratoryofh-230129191323-78af778c/85/The-effect-of-varying-flow-rate-counter-flow-shell-and-tube-heat-exchanger-1-320.jpg)
