Topic
Saturation dome
About: Saturation dome is a research topic. Over the lifetime, 8 publications have been published within this topic receiving 59 citations.
Papers
1 Jan 2008
TL;DR: In this paper, an assessment of C6F as a working fluid for organic rankine cycle applications by comparing it with HFC245fa, an ORC working fluid with a similar critical temperature is made.
Abstract: This paper makes an assessment of C6F as a working fluid for Organic Rankine Cycle applications by comparing it with HFC245fa, an ORC working fluid with a similar critical temperature The smaller slope of the saturated liquid line of C6F on the temperature-entropy diagram relative to hydrofluorocarbon working fluids can be an advantage for certain ORC applications This smaller slope reduces the pinch-point problem in the evaporator allowing better utilization of sensible heat sources On the other hand, the corresponding smaller slope of the saturated vapor line of C6F on the temperature-entropy diagram limits the specific isentropic enthalpy drop over the turbine This results in larger mass flow rates for identical turbine power output at equal evaporator and condenser saturation temperatures, which for systems with pump efficiencies less than turbine efficiencies would result in a cycle efficiency penalty The highly leaned-over saturation dome of C6F also increases the de-superheat loss in the condenser, hurting ORC cycle efficiency A recuperator would be required to minimize these losses
15 citations
TL;DR: In this article, it is shown that the errors may be reduced to within 1% over the entire range of pressures (both sub-critical and super-critical pressures) required in steam-plant calculations.
12 citations
Patent•
19 Dec 2007
TL;DR: In this article, the authors proposed a cooling system that allows the two phase mixture exiting the cold plate evaporator device to move within a saturation dome of all mixtures between a saturated liquid and a saturated vapor.
Abstract: The present invention offers an improvement over prior art cooling systems by accounting for rapid changes in thermal load. The circulation rate of refrigerant in a cooling cycle is set so that the two phase mixture exiting the cold plate evaporator device stays within a saturation dome of all mixtures between a saturated liquid and a saturated vapor. Furthermore, the two phase mixture exiting the cold plate evaporator device is allowed to move within the saturation dome so that the exit quality of the two phase mixture leaving the cold plate evaporator device changes with the heat load being removed. In this way, rapid changes in heat load are removed from the component or components in contact with the cold plate evaporator device without having to change the circulation rate of refrigerant in the cycle. Only the exit quality of the vapor leaving the cold plate/evaporator changes.
9 citations
TL;DR: In this paper, a computer program has been developed to provide a graphical comparison of the theoretical and predicted curves of the liquid-vapor saturation dome of a pure substance with the Maxwell rule and several analytical equations of state.
Abstract: The Maxwell rule is used together with several analytical equations of state to predict the liquid-vapor saturation dome of a pure substance. A computer program has been developed to provide a graphical comparison of the theoretical and predicted curves.
6 citations
26 Aug 1992
TL;DR: In this paper, the authors examined the thermal conductivity of helium as a function of temperature and pressure and found that at temperatures above 20 degrees Kelvin, the four isobaric curves are indistinguishable.
Abstract: This engineering note examines the thermal conductivity of helium as a function of temperature and pressure. The note attempts to determine the effect of varying pressure on the thermal conductivity of the vapor state over various temperature ranges. The plots clearly show that at temperatures above 20 degrees Kelvin. pressure does not have a significant effect on the thermal conductivity of Helium. In figures 1 and 2 the four isobaric curves are indistinguishable. This is also evident from the numeric data in table 1. Comparing the thermal conductivity of any particular row in table I, the thermal conductivity does not change by more than one percent from one column to another. Below 20K, the curves begin to diverge as they approach the saturation dome. This affect is more pronounced at pressures above the critical pressure of 0.23MPa, At which point the fluid is neither a liqUid or vapor. At pressures between atmospheriC pressure and 0.01 MPa, the thermal conductivity of Helium is independent of pressure below 20K as well as above 20K.
3 citations
Performance Metrics
| Year | Papers |
|---|---|
| 2020 | 1 |
| 2009 | 1 |
| 2008 | 1 |
| 2007 | 1 |
| 2001 | 1 |
| 1998 | 1 |