Thermal and hydraulic performance of a graphite block heat exchanger
| Autor: | Joe Deans, G. Schou, Hans Müller-Steinhagen, J. Künzel |
|---|---|
| Rok vydání: | 1997 |
| Předmět: |
Dynamic scraped surface heat exchanger
Chemistry Process Chemistry and Technology General Chemical Engineering Plate heat exchanger Energy Engineering and Power Technology Thermodynamics General Chemistry Heat transfer coefficient Mechanics Concentric tube heat exchanger Industrial and Manufacturing Engineering Heat capacity rate NTU method Heat spreader Shell and tube heat exchanger |
| Zdroj: | Chemical Engineering and Processing: Process Intensification. 36:371-384 |
| ISSN: | 0255-2701 |
| DOI: | 10.1016/s0255-2701(97)00012-3 |
| Popis: | A test rig has been assembled to investigate the thermodynamic and hydraulic performance of a cylindrical graphite block heat exchanger consisting of three graphite blocks and a steel shell. The flow pattern in the heat exchanger was triple cross-flow on the shell-side (service side) with one pass per block and a single pass on the tube-side (process side). Overall heat transfer coefficients and pressure drops have been measured for a range of operating conditions. Shell-side leakage flows were significant, with values up to 19% with water and 38% with a heat transfer oil. Corresponding increases in the overall heat transfer coefficient without leakage flow were 8 and 21%, respectively. The mean difference between the theoretical and experimental overall heat transfer coefficients for the runs with leakage flow does not exceed 6% with water as the shell-side liquid. With oil the error does not exceed 8%. Pressure drop models were developed for both the shell-side and tube-side of the heat exchanger. The tube-side model predicted the pressure drop with a mean error of 5%. Errors within 20% can be expected for the shell-side pressure drop model. The pressure drop on the shell-side depends on a number of different losses and it is therefore difficult to be modelled accurately. |
| Databáze: | OpenAIRE |
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