steam jet ejector design calculation spreadsheet

In their study, fluid properties were evaluated by using NIST (1980) subroutines for equations of state of refrigerants.

Huang carried out a 1D model on ejector performance at critical-mode operation Ouzzane and Aidoun (2003) proposed a 1D model allowing to track flow conditions along the ejector. provided the results of 1D model theoretical and experimental study of a steam jet refrigerator. So a lot of studies of SSE performance with various types of working fluid in refrigeration field could be found for example, Eames et al. A good overview of the different applications in this field may be found in the review article by Sun and Eames (1995). In view of the numerous publications available on this subject, it is perhaps one of the most important application areas for ejectors. In addition, using waste heat or solar energy to power a refrigeration system will reduce the electrical energy consumption used to power vapour-compression refrigeration systems, potentially reducing the emissions of greenhouse gasses that are associated with the production of electricity from fossil fuel burning power plants. A steam jet refrigeration can be considered as one of the most suitable refrigeration systems for the present energy and environment situations, because of simple mode of function, lack of moving parts, and capability of driving a refrigeration device primarily through the use of waste heat or solar energy making them particularly attractive in this energy-conscious era. The supersonic steam ejector (SSE) is widely used in many industry fields which are steam powered such as oil, thermoelectric, and refrigeration. Primary fluid pressure has a critical value, and the entrainment ratio reaches its peak at working critical pressure when working steam superheat degree increases, the entrainment ratio is increased. There is an optimum mixing chamber angel and NXP makes the entrainment ratio achieve its maximum as throat length is decreased within a range, the entrainment ratio remains unchanged.

The results show that performance of the ejector is underestimated using ideal gas model, and the entrainment ratio is 20%–40% lower than that when using real gas model.

The mixing chamber angle, throat length, and nozzle exit position (NXP) primary pressure and temperature effects on entrainment ratio were investigated. In this paper the Computational Fluids Dynamics (CFD) method was employed to simulate a supersonic steam ejector, SST k-w turbulence model was adopted, and both real gas model and ideal gas model for fluid property were considered and compared.

Supersonic steam ejector is widely used in steam energy systems such as refrigeration, wood drying equipment, papermaking machine, and steam turbine.

Steam jet ejector design calculation spreadsheet