Primary Word |
Secondary Word |
Definition |
Tutorial Page Link |
| R-134a | 2C1, 4F7, | ||
| radiation | A mode of energy transfer that is caused by the emission of photons by the molecules giving up energy and the absorption of photons by the molecules gaining energy. | 4B14 , 21 - 23 | |
| Rankine cycle | 9B2 | ||
| Rankine cycle | back work ratio | 9B7 | |
| Rankine cycle | binary | 9C10 , 11 | |
| Rankine cycle | boiler | 9B3 | |
| Rankine cycle | boiler irreversibilities | 9D2 | |
| Rankine cycle | cogeneration | 9C12 , 13 | |
| Rankine cycle | condenser | 9B5 | |
| Rankine cycle | condenser irreversibilities | 9D4 | |
| Rankine cycle | decreasing condenser pressure | 9B9, 9C2, | |
| Rankine cycle | ideal | 9C1 | |
| Rankine cycle | increasing boiler pressure | 9B8, 9C2, | |
| Rankine cycle | pump | 9B6 | |
| Rankine cycle | pump irreversibilities | 9D5 | |
| Rankine cycle | real | 9D1 - 8 | |
| Rankine cycle | regeneration | 9C7 - 9 | |
| Rankine cycle | reheat | 9C5 , 6 | |
| Rankine cycle | sources of irreversibility | 9D2 - 6 | |
| Rankine cycle | supercritical | 9C4 | |
| Rankine cycle | superheat | 9C3 | |
| Rankine cycle | thermal efficiency | 9B7 | |
| Rankine cycle | TS diagram | 9B2 | |
| Rankine cycle | turbine | 9B4 | |
| Rankine cycle | turbine irreversibilities | 9D3 | |
| Rankine temperature scale | 1B4, 1D10, | ||
| real adiabatic turbine | best case | 8C5 , 6 | |
| real adiabatic turbine | worst case | 8C5 , 6 | |
| real gas | In principle, all gases are real gases. In practice, gases that deviate from the Ideal Gas EOS by more than 1% are considered to be non-ideal or real gases. | 2E4 | |
| real substance | property change | 3D18 | |
| Redlich-Kwong EOS | A cubic, empirical EOS that accurately represents the behavior of a wide variety of systems. Its two parameters are empirical functions of the critical temperature and pressure. | 2F1 , 7 | |
| reduced pressure | A dimensionless pressure used with the generalized compressibility charts and other EOS's. The Reduced Pressure, Pr, is defined as the ratio of the absolute pressure of the system to the critical pressure of the species in the system. As the reduce pressure approaches one, the pressure of the system approaches the critical pressure. | 2E9 | |
| reduced temperature | A dimensionless temperature used with the generalized compressibility charts and other EOS's. The Reduced Temperature Tr, is defined as the ratio of the absolute temperature of the system to the critical temperature of the species in the system. As the reduce temperature approaches one, the temperature of the system approaches the critical temperature. | 2E9 | |
| reference state | A state (T, P, phase) where one property is arbitrarily assigned a value of zero. All other relative thermodynamic properties are determined relative to the Reference State. For example, a common reference state for steam tables is liquid water at the triple point (0.01 C and 0.6113 kPa). At this state we could select any one relative thermodynamic property to be equal to zero. Usually we choose either specific internal energy or specific enthalpy, but we could instead specify that the specific entropy is zero at our reference state. It just isn't quite as convenient. | 3B9 | |
| reference state | entropy | 7B6 | |
| refrigerant | 10B5 | ||
| refrigerant | selection of | 10B5 | |
| refrigerant | vapor pressure | 10B5, 10C1, | |
| refrigeration | A cycle in which work is done on a system in order to remove energy in the form of heat from a cold reservoir and then reject heat to a higher temperature reservoir. | 10A1 | |
| refrigeration | ammonia absorption | 10A1 | |
| refrigeration | COP | A measure of the performance of a refrigeration or heat pump system. In each case, COP is the desired energy transfer rate divided by the requireed energy transfer rate. For a refrigeration cycle COP is the heat transfer rate from the cold reservoir divided by the rate at which work is supplied to the cycle. COP is generally greater than 1. | 10A1 |
| refrigeration | thermoelectric | 10A1 | |
| refrigeration | vapor-compression | 10A1 | |
| refrigeration cycle | 4F1 , 3 , 7 - 9 | ||
| refrigeration cycle | air-standard Brayton | 10E1 , 2 | |
| refrigeration cycle | gas | 10E1 - 5 | |
| refrigeration cycle | gas, COP | 10E4 | |
| refrigeration cycle | gas, non-ideal | 10E3 | |
| refrigeration cycle | gas, regeneration | 10E4 , 5 | |
| regenerator | ideal | 9F3 | |
| relative molar volume | how to use | 7E4 | |
| relative molar volume | 7E2 - 4 | ||
| relative humidity | A measure of how close the gas phase is to saturation. A relative humidity of 100% means that the gas phase is saturated. A saturated gas phase contains as much water vapor as it possibly can at that temperature. Relative humidity is defined as the ratio of the partial pressure of water to the vapor pressure of water at the temperature of the gas phase. | 2D6 | |
| relative pressure | 7E2 - 4 | ||
| relative pressure | how to use | 7E4 | |
| relative saturation | A measure of how close the gas phase is to saturation with the condensable species. A Relative Saturation of 100% means that the gas phase is saturated. A saturated gas phase contains as much of the condensable species as it possibly can at that temperature. Relative Saturation of a gas phase is defined as the ratio of the partial pressure of the condensable species to the vapor pressure of the condensable species at the temperature of the gas phase. | 2D6 | |
| reservoir | 6B2 | ||
| reservoir | thermal | 6B2 | |
| resistive force | 4A14 | ||
| reversible process | 6D2 , 8 | ||
| reversing valve | 10D2 | ||
| rotational energy | The energy associated with the atoms of a polyatomic molecule rotating about an axis. | 2A4 | |
| RPM | Revolutions per minute. | 4A23 | |
