Thermodynamic analysis of a system converted from heat pump to refrigeration device

Afshari, Faraz; Karagöz, Şendoğan; Çomaklı, Ömer; Zavaragh, Hadi Ghasemi

doi:10.1007/s00231-018-2412-5

Cited by 24 publications

(8 citation statements)

References 33 publications

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“…In a research conducted by Tu et al [46], uncertainty value for transferred heat was found as ± 10.4%. Also, Afshari et al [47] obtained uncertainty value for temperature as 1.2%. Figure 20 presents average pressure drop in PHE with different number of plates.…”

Section: Experimental Findingsmentioning

confidence: 97%

A comparative study on utilizing hybrid-type nanofluid in plate heat exchangers with different number of plates

Gürbüz

Sözen

Variyenli

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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Different methods have been utilized to enhance the thermal efficiency of the heat exchangers (HEs). A widely used method to upgrade the thermal efficiency of HEs is upgrading the thermal properties of working fluid by utilizing nanoparticles. In this study, Al 2 O 3 and CuO have been utilized to prepare Al 2 O 3-CuO/water hybrid nanofluid. Accordingly, Al 2 O 3 and CuO nanoparticles have been mixed into the water with 1% (50:50) weight concentration. The main objective of this work is testing the prepared hybrid nanofluid in plate-type HEs (PHEs) with 8, 12 and 16 plates to determine the influence of number of plates on heat transfer improvement by hybrid nanofluid. Experimental findings of the present study demonstrated that utilizing Al 2 O 3-CuO/water hybrid-type nanofluid in the PHE enhanced thermal efficiency notably in comparison with singletype nanofluids. Using this hybrid nanofluid increased the thermal performance in all PHEs with different number of plates. However, it is observed that increasing number of plates led to more increment in thermal performance by utilizing hybrid nanofluid. The highest increment in overall heat transfer coefficient was obtained as 12%, 19% and 20% in PHEs with eight, 12 and 16 plates, respectively. In addition, the highest enhancement in effectiveness was achieved as 10%, 11.7% and 16% in PHEs with eight, 12 and 16 plates, respectively. Keywords Plate heat exchanger • Hybrid nanofluid • Al 2 O 3-CuO/water • Performance List of symbols A Total heat transfer area (m 2) C Heat capacity rate (W/K) c p Specific heat capacity (J/kg K) D h Hydraulic diameter (m) f Friction factor

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Section: Experimental Findingsmentioning

confidence: 97%

A comparative study on utilizing hybrid-type nanofluid in plate heat exchangers with different number of plates

Gürbüz

Sözen

Variyenli

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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“…Heat transfer augmentation as one of the significant demands in the industrial sector has been a subject for a lot of research studies that indicate the significance of this issue in the field of engineering (Khanlari et al, 2020;Çiftçi and Sözen, 2020;Afshari et al, 2019). Advanced types and novel designs of heat exchangers (HEs) have been developed to improve the efficiency of HEs (Arsenyeva et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

A comprehensive survey on utilization of hybrid nanofluid in plate heat exchanger with various number of plates

Afshari

Tuncer

Sözen

et al. 2021

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Purpose Using suspended nanoparticles in the base fluid is known as one of the most efficient ways for heat transfer augmentation and improving the thermal efficiency of various heat exchangers. Different types of nanofluids are available and used in different applications. The main purpose of this study is to investigate the effects of using hybrid nanofluid and number of plates on the performance of plate heat exchanger. In this study, TiO2/water single nanofluid and TiO2-Al2O3/water hybrid nanofluid with 1% particle weight ratio have been used to prepare hybrid nanofluid to use in plate type heat exchangers with three various number of plates including 8, 12 and 16. Design/methodology/approach The experiments have been conducted with the aim of examining the impact of plates number and used nanofluids on heat transfer enhancement. The performance tests have been done at 40°C, 45°C, 50°C and 55°C set outlet temperatures and in five various Reynolds numbers between 1,600 and 3,800. Also, numerical simulation has been applied to verify the heat and flow behavior inside the heat exchangers. Findings The results indicated that using both nanofluids raised the thermal performance of all tested exchangers which have a various number of plates. While the major outcomes of this study showed that TiO2-Al2O3/water hybrid nanofluid has priority when compared to TiO2/water single type nanofluid. Utilization of TiO2-Al2O3/water nanofluid led to obtaining an average improvement of 7.5%, 9.6% and 12.3% in heat transfer of heat exchangers with 8, 12 and 16 plates, respectively. Originality/value In the present work, experimental and numerical analyzes have been conducted to investigate the influence of using TiO2-Al2O3/water hybrid nanofluid in various plate heat exchangers. The attained findings showed successful utilization of TiO2-Al2O3/water nanofluid. Based on the obtained results increasing the number of plates in the heat exchanger caused to obtain more increment by using both types of nanofluids.

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“…Overcharge and undercharge conditions were studied experimentally to see its effect on system performance with the objective of optimal charge measurement. 16,17 Until now most of the studies about this considered experimental data or on rig testing to stabilize the system before proper operation. 18,19 Jimmy et al invented an apparatus for charging the absorption refrigeration systems during field operations to keep the system's operation stable.…”

Section: Introductionmentioning

confidence: 99%

Modelling and performance analysis of a single stage open absorption heat pump system in aspen plus using aqueous LiBr and HCOOK: A waste moist heat recovery application

Shahzad

Ding

Xuan

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part A:

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Open absorption heat pump (OAHP) system is more viable option to recover waste heat from moist gas as compared to the traditional condensation methods. This promising technology has great potential for latent heat recovery from moist gas, drying process in paper and other industrial heating applications. This study presents the process modelling and comparative analysis of OAHP system in Aspen Plus using two different solutions by adopting part regeneration technique. The promising potassium formate-water (HCOOK/H2O) which has lower causticity, lower costs and better crystallization characteristics is used as an alternative to the caustic lithium bromide-water (LiBr/H2O) solution in this study. Process model of the system is established in Aspen Plus and, the properties validity is confirmed with published experimental and Engineering Equation Solver (EES) library data. A detailed comparative parametric study is carried out to evaluate the effect of influencing parameters on coefficient of performance (COP), water recovery (φ) and heat recovery (ζ) efficiencies. The performance of OAHP system is found to be very similar using different concentrations as 2.13 COP value for 50% LiBr/H2O and 2.19 for 70% HCOOK/H2O solution over design conditions. Similarly, φ is found to be 0.701, 0.688 while ζ as 0.716 and 0.705 for both the absorbents. Moreover, the system’s operational concentration range is 45-61.3% for LiBr/H2O and 55-82.1% for HCOOK/H2O at 135 °C regeneration heat input. Potassium formate solution having quite similar properties to the aqueous lithium bromide is also confirmed to have similar performance trends using 50% and 70% concentrations.

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Thermodynamic analysis of a system converted from heat pump to refrigeration device

Cited by 24 publications

References 33 publications

A comparative study on utilizing hybrid-type nanofluid in plate heat exchangers with different number of plates

A comparative study on utilizing hybrid-type nanofluid in plate heat exchangers with different number of plates

A comprehensive survey on utilization of hybrid nanofluid in plate heat exchanger with various number of plates

Modelling and performance analysis of a single stage open absorption heat pump system in aspen plus using aqueous LiBr and HCOOK: A waste moist heat recovery application

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