Heat Transfer Analysis between R744 and HFOs inside Plate Heat Exchangers
Plate heat exchangers (PHE) are used for a wide range of applications, thus utilizing new and unique heat sources is of crucial importance. R744 has a low critical temperature, which makes its thermophysical properties variation smoother than other supercritical fluids. As a result, it can be used a...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2022-08-01
|
| Series: | Entropy |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1099-4300/24/8/1150 |
| _version_ | 1797432244378271744 |
|---|---|
| author | Anas F. A. Elbarghthi Mohammad Yousef Hdaib Václav Dvořák |
| author_facet | Anas F. A. Elbarghthi Mohammad Yousef Hdaib Václav Dvořák |
| author_sort | Anas F. A. Elbarghthi |
| collection | DOAJ |
| description | Plate heat exchangers (PHE) are used for a wide range of applications, thus utilizing new and unique heat sources is of crucial importance. R744 has a low critical temperature, which makes its thermophysical properties variation smoother than other supercritical fluids. As a result, it can be used as a reliable hot stream for PHE, particularly at high temperatures. The local design approach was constructed via MATLAB integrated with the NIST database for real gases. Recently produced HFOs (R1234yf, R1234ze(E), R1234ze(Z), and R1233zd(E)) were utilized as cold fluids flowing through three phases: Liquid-phase, two-phase, and gas-phase. A two-step study was performed to examine the following parameters: Heat transfer coefficients, pressure drop, and effectiveness. In the first step, these parameters were analyzed with a variable number of plates to determine a suitable number for the next step. Then, the effects of hot stream pressure and cold stream superheating difference were investigated with variable cold channel mass fluxes. For the first step, the results showed insignificant differences in the investigated parameters for the number of plates higher than 40. Meanwhile, the second step showed that increasing the hot stream pressure from 10 to 12 MPa enhanced the two-phase convection coefficients by 17%, 23%, 75%, and 50% for R1234yf, R1234ze(E), R1234ze(Z), and R1233zd(E), respectively. In contrast, increasing the cold stream superheating temperature difference from 5 K to 20 reduced the two-phase convection coefficients by 14%, 16%, 53%, and 26% for R1234yf, R1234ze(E), R1234ze(Z), and R1233zd(E), respectively. Therefore, the R744 is suitable for PHE as a driving heat source, particularly at higher R744 inlet pressure and low cold stream superheating difference. |
| first_indexed | 2024-03-09T09:57:35Z |
| format | Article |
| id | doaj.art-9a926b7687b044c299e56dbe30a64e77 |
| institution | Directory Open Access Journal |
| issn | 1099-4300 |
| language | English |
| last_indexed | 2024-03-09T09:57:35Z |
| publishDate | 2022-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Entropy |
| spelling | doaj.art-9a926b7687b044c299e56dbe30a64e772023-12-01T23:40:29ZengMDPI AGEntropy1099-43002022-08-01248115010.3390/e24081150Heat Transfer Analysis between R744 and HFOs inside Plate Heat ExchangersAnas F. A. Elbarghthi0Mohammad Yousef Hdaib1Václav Dvořák2Department of Applied Mechanics, Faculty of Mechanical Engineering, Technical University of Liberec, Stdentská 1402/2, 46117 Liberec, Czech RepublicDepartment of Applied Mechanics, Faculty of Mechanical Engineering, Technical University of Liberec, Stdentská 1402/2, 46117 Liberec, Czech RepublicDepartment of Applied Mechanics, Faculty of Mechanical Engineering, Technical University of Liberec, Stdentská 1402/2, 46117 Liberec, Czech RepublicPlate heat exchangers (PHE) are used for a wide range of applications, thus utilizing new and unique heat sources is of crucial importance. R744 has a low critical temperature, which makes its thermophysical properties variation smoother than other supercritical fluids. As a result, it can be used as a reliable hot stream for PHE, particularly at high temperatures. The local design approach was constructed via MATLAB integrated with the NIST database for real gases. Recently produced HFOs (R1234yf, R1234ze(E), R1234ze(Z), and R1233zd(E)) were utilized as cold fluids flowing through three phases: Liquid-phase, two-phase, and gas-phase. A two-step study was performed to examine the following parameters: Heat transfer coefficients, pressure drop, and effectiveness. In the first step, these parameters were analyzed with a variable number of plates to determine a suitable number for the next step. Then, the effects of hot stream pressure and cold stream superheating difference were investigated with variable cold channel mass fluxes. For the first step, the results showed insignificant differences in the investigated parameters for the number of plates higher than 40. Meanwhile, the second step showed that increasing the hot stream pressure from 10 to 12 MPa enhanced the two-phase convection coefficients by 17%, 23%, 75%, and 50% for R1234yf, R1234ze(E), R1234ze(Z), and R1233zd(E), respectively. In contrast, increasing the cold stream superheating temperature difference from 5 K to 20 reduced the two-phase convection coefficients by 14%, 16%, 53%, and 26% for R1234yf, R1234ze(E), R1234ze(Z), and R1233zd(E), respectively. Therefore, the R744 is suitable for PHE as a driving heat source, particularly at higher R744 inlet pressure and low cold stream superheating difference.https://www.mdpi.com/1099-4300/24/8/1150R744plate heat exchanger local analysisheat transfer analysispressure drop analysis |
| spellingShingle | Anas F. A. Elbarghthi Mohammad Yousef Hdaib Václav Dvořák Heat Transfer Analysis between R744 and HFOs inside Plate Heat Exchangers Entropy R744 plate heat exchanger local analysis heat transfer analysis pressure drop analysis |
| title | Heat Transfer Analysis between R744 and HFOs inside Plate Heat Exchangers |
| title_full | Heat Transfer Analysis between R744 and HFOs inside Plate Heat Exchangers |
| title_fullStr | Heat Transfer Analysis between R744 and HFOs inside Plate Heat Exchangers |
| title_full_unstemmed | Heat Transfer Analysis between R744 and HFOs inside Plate Heat Exchangers |
| title_short | Heat Transfer Analysis between R744 and HFOs inside Plate Heat Exchangers |
| title_sort | heat transfer analysis between r744 and hfos inside plate heat exchangers |
| topic | R744 plate heat exchanger local analysis heat transfer analysis pressure drop analysis |
| url | https://www.mdpi.com/1099-4300/24/8/1150 |
| work_keys_str_mv | AT anasfaelbarghthi heattransferanalysisbetweenr744andhfosinsideplateheatexchangers AT mohammadyousefhdaib heattransferanalysisbetweenr744andhfosinsideplateheatexchangers AT vaclavdvorak heattransferanalysisbetweenr744andhfosinsideplateheatexchangers |