| Zugriffsnummer | 15633 |
| Dokumenttyp | Konferenzartikel |
| Peer Review | unbekannt |
| Sprache | Englisch |
| Titel | Calibration of volume standards for flow rates of hot water up to 120 m3/h at temperatures up to 180 °C |
| Autor(in); Institution |
March, Joachim-Friedrich; 7.33, Messung thermischer Energie, PTB-Berlin
|
| Quelle/Jahr | 5th International Symposium on Fluid Flow Measurement: Proceedings:(2002), 11 S. |
| Availability | [CD-ROM] ; file name: 065.pdf |
| Herausgeber(in) |
North American Fluid Flow Measurement Council
|
| Verlag | Madison: Omnipress |
| Konferenzangaben | 5th International Symposium on Fluid Flow Measurement, Arlington, VA, 7-10, April, 2002, USA |
| Zusammenfassung | Heat district suppliers demand carefully constructed and calibrated flow sensors fo heat meters at temperatures above 100 °C. For this reason a test facility for hot water flows had been installed at PTB generating volume flow rates up to 120 m3/h at temperatures up to 180 °C. The fundamental mass-time method (gravimetric standard method) is available only below 80 °C because of the losses in mass due to evaporation. Above this temperature only closed test facilities operating under pressure are therefore suited. Because of the large technical difficulties encountered at high temperatures a test facility using the gravimetric standard method is not yet available. For the determination of the flow rates above 100 °C in such test facilities, neither primary nor calibrated reference flow rate standards are known up to now. |
