A review study on the active methods of heat transfer enhancement in heat exchangers using electroactive and magnetic materials

Thapa, Sashank; Samir, Sushant; Kumar, K. Ravi; Singh, Sushma

doi:10.1016/j.matpr.2021.01.382

Cited by 47 publications

(14 citation statements)

References 20 publications

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“…These coating helps to enhance the performance of receiver. 7 Receivers used for SPT are mainly of two types; evacuated and non-evacuated. Evacuated type has better performance as high vacuum is there between glass cover and steel pipe, hence reducing thermal losses and enhancing overall efficiency of SPT.…”

Section: Receivermentioning

confidence: 99%

A review study on the performance enhancement of solar parabolic trough receiver by various passive techniques

Singh

Samir²,

Kumar

2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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This is a new era where the world’s energy consumption is so high and is likely to increase over 60% of current consumption by the year 2030. Therefore, renewable energy should be used most frequently. The most preferred alternative to fossil fuels is solar energy but converting solar energy into usable form is the most challenging part. The conversion to thermal energy is the one option. In the area of solar thermal power generation, a solar parabolic trough (SPT) collector is an effective method. Also, the use of passive methods to enhance the thermal performance of these parabolic trough receivers is currently the researcher’s interest This review study is focused on different types of geometrical modification (Artificial roughness) used to enhance the thermal performance of SPT receivers. Based on the extensive study it has been found that conical strip insert is a very broad field for research as it can enhance the thermal performance up to 5–10 times. Also there are parameters associated with the conical strips like shape, pitch, angle of twist, slant angle, geometry angle, etc. which can contribute to better performance when used in SPT receiver.

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Section: Receivermentioning

confidence: 99%

A review study on the performance enhancement of solar parabolic trough receiver by various passive techniques

Singh

Samir²,

Kumar

2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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“…There are mainly two methods for heat transfer enhancement which are active and passive techniques. 17 The passive method is preferred mostly over the active method because the passive does not require an external power source, no design modification of the receiver is required in it, and it is less costly. One of the passive techniques is the use of nanofluids; nanofluids are a mixture of base fluids with nanoparticles with mainly size between 1 and 100 nm used to enhance the heat transfer rate as compared with conventional HTF such as water, oil, etc.…”

Section: Receivermentioning

confidence: 99%

A review study on the performance of a parabolic trough receiver using twisted tape inserts

Thapa

Samir

Kumar³

2021

Proceedings of the Institution of Mechanical Engineers, Part E:

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Heat transfer in concentrating solar collectors like parabolic troughs has proven nowadays a very efficient method by using different passive techniques to increase the heat transfer rate. The use of passive techniques also increases the pumping power requirements to make the flow through the receiver. So, a number of researchers are working to find out the optimum performance conditions for parabolic trough receivers by using different types of inserts in flow paths. This paper presents a wide range of literature available for solar parabolic troughs in one place. Based on this extensive study, it is found that twisted tape inserts is a very wide field for investigation and the use of different shapes, pitch value, free space, and angle of twist tape are the parameters that can be considered for further studies to improve the performance of solar troughs. Also, various combinations of perforation and cuts on twisted tapes can be used to achieve enhanced performance.

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“…The main influencing factors for the efficiency of the PTC receiver are thermal conductivity, receiver geometry, the thermal emittance of the absorber tubes, receiver structure, absorptivity, and transmittance of glass, 13 among all these receivers is one of the critical parts for the performance of PTC as studied and presented by different researchers. 14,15,16,17,18 There are different active and passive methods for heat transfer enhancement, in the active methods, there is a use of external sources like spray jets, magnetic materials, electroactive materials, ultrasonic waves, and surface vibration, 19 etc. whereas passive techniques use geometric modification in heat exchanger tube.…”

Section: Heat Transfer Augmentation In Ptcmentioning

confidence: 99%

Performance evaluation of solar parabolic trough receiver using multiple twisted tapes with circular perforation and delta winglet

Thapa

Samir

Kumar³

2021

Proceedings of the Institution of Mechanical Engineers, Part E:

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A parabolic trough collector (PTC) is one of the concentrating types of a solar collector working in the medium range of temperature from 100–400 °C, for this reason, the efficiency of the solar parabolic trough is less than other types of concentrating solar collector (Point focusing types) in terms of solar to thermal energy conversion, the improvement in efficiency is achieved by various passive heat augmentation techniques in the receiver tube. One of the promising passive techniques is twisted tape inserts used in the receiver due to its simplicity in design and the various possibility of geometric modification. This paper deals with the performance evaluation of the solar parabolic trough receiver system by using passive techniques in the receiver. The testing of the receiver of PTC was done by using multiple perforated twisted tapes with winglets having different perforation ratios ([Formula: see text]) of 0.05, 0.15, 0.25, twist ratios ([Formula: see text]) of 3, 4, 5 and wing depth ratios ([Formula: see text]) of 0.1, 0.2 and 0.3. The number of twisted tapes was fixed at 4. The examination was conducted for Reynolds numbers ([Formula: see text]) varying from 3000–21,000 using air as working fluid. The outcome shows that the use of perforation and winglet in twisted tapes augment the Nusselt number as compared to that of smooth twisted tapes. The maximum thermohydraulic performance ([Formula: see text]) of 2.40 is received by using multiple twisted tapes with perforation and winglet having [Formula: see text] = 0.3, [Formula: see text] = 3, and [Formula: see text] = 0.05 at the Re = 21,000. The correlations for Nusselt number ([Formula: see text]) and friction factor ([Formula: see text]) are also developed with ± 8.5% and ± 8.3% accuracy, respectively.

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A review study on the active methods of heat transfer enhancement in heat exchangers using electroactive and magnetic materials

Cited by 47 publications

References 20 publications

A review study on the performance enhancement of solar parabolic trough receiver by various passive techniques

A review study on the performance enhancement of solar parabolic trough receiver by various passive techniques

A review study on the performance of a parabolic trough receiver using twisted tape inserts

Performance evaluation of solar parabolic trough receiver using multiple twisted tapes with circular perforation and delta winglet

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