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# The effect of varying flow rate-parallel flow double pipe heat exchanger

To show how different cold flow rates affect the performance of the heat exchanger in parallel flow connection.

To show how different cold flow rates affect the performance of the heat exchanger in parallel flow connection.

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### The effect of varying flow rate-parallel flow double pipe heat exchanger

1. 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 . 4 Page 1 EXPERIMENT NO. 4 ((The effect of varying flow rate-parallel flow double pipe heat exchanger)) Aim: To show how different cold flow rates affect the performance of the heat exchanger in parallel 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 Parallel flow scheme
2. 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 . 4 Page 2 Table 1 Notation
3. 3. 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 . 4 Page 3 Fig. 2 Specific heat capacity of water at constant pressure [1] Fig. 3 Water density [1]
4. 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 . 4 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. 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 . 4 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 Double pipe – Parallel flow heat exchanger apparatus [1] References 1. TecQuipment Ltd, Concentric tube heat exchanger apparatus, Model: VDAS-F TD360A. 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