Mathematical model of liquid vapor compression system for multicircuit cooling systems of high mobile platform

© Research India Publications. The descriptions of the structure, the principle of operation and the mathematical model of the liquid-vapor compression cooling system, through which an effective cooling of a mobile platform power plant at elevated ambient temperature is possible. The proposed model allows to simulate the thermodynamic processes of heat and mass transfer and heat transfer, depending on the system load, its design parameters and the material of heat exchangers, the mass flow of refrigerant and coolant flow, taking into account the ambient temperature. The result of mathematical modeling showed that by the coolant temperature increase up to 127 °C, an average temperature pressure in a heat exchanger-condenser between the refrigerant and air increased. Therefore the amount of waste heat to the atmosphere was significantly increased. This will ensure an efficient operation of a cooling system at an elevated ambient temperature and will improve the weight and size of a cooling system in general

A mathematical model of the controlled axial flow divider for mobile machines

The authors give a mathematical model of the axial adjustable flow divider allowing one to define the parameters of the feed pump and the hydraulic motor-wheels in the multi-circuit hydrostatic transmission of mobile machines, as well as for example built features that allows to clearly evaluate the mutual influence of the values of pressure and flow on all input and output circuits of the system

Simulation of parameters of hydraulic drive with volumetric type controller

© Published under licence by IOP Publishing Ltd. The article presents a mathematical model of volumetric type hydraulic drive controller that allows to calculate the parameters of forward and reverse motion. According to the results of simulation static characteristics of rod's speed and the force of the hydraulic cylinder rod were built and the influence of the angle of swash plate of the controller at the characteristics profile is shown. The results analysis showed that the proposed controller allows steplessly adjust the speed□ of hydraulic cylinder's rod motion and the force developed on the rod without the use of flow throttling

Super-long Anabiosis of Ancient Microorganisms in Ice and Terrestrial Models for Development of Methods to Search for Life on Mars, Europa and other Planetary Bodies

Successful missions to Mars, Europe and other bodies of the Solar system have created a prerequisite to search for extraterrestrial life. The first attempts of microbial life detection on the Martian surface by the Viking landed missions gave no biological results. Microbiological investigations of the Martian subsurface ground ice layers seem to be more promising. It is well substantiated to consider the Antarctic ice sheet and the Antarctic and Arctic permafrost as terrestrial analogues of Martian habitats. The results of our long-standing microbiological studies of the Antarctic ice would provide the basis for detection of viable microbial cells on Mars. Our microbiological investigations of the deepest and thus most ancient strata of the Antarctic ice sheet for the first time gave evidence for the natural phenomenon of long-term anabiosis (preservation of viability and vitality for millennia years). A combination of classical microbiological methods, epifluorescence microscopy, SEM, TEM, molecular diagnostics, radioisotope labeling and other techniques made it possible for us to obtain convincing proof of the presence of pro- and eukaryotes in the Antarctic ice sheet. In this communication, we will review and discuss some critical issues related to the detection of viable microorganisms in cold terrestrial environments with regard to future searches for microbial life and/or its biological signatures on extraterrestrial objects

A mathematical model of the controlled axial flow divider for mobile machines

The authors give a mathematical model of the axial adjustable flow divider allowing one to define the parameters of the feed pump and the hydraulic motor-wheels in the multi-circuit hydrostatic transmission of mobile machines, as well as for example built features that allows to clearly evaluate the mutual influence of the values of pressure and flow on all input and output circuits of the system

Mathematical model of liquid vapor compression system for multicircuit cooling systems of high mobile platform

© Research India Publications. The descriptions of the structure, the principle of operation and the mathematical model of the liquid-vapor compression cooling system, through which an effective cooling of a mobile platform power plant at elevated ambient temperature is possible. The proposed model allows to simulate the thermodynamic processes of heat and mass transfer and heat transfer, depending on the system load, its design parameters and the material of heat exchangers, the mass flow of refrigerant and coolant flow, taking into account the ambient temperature. The result of mathematical modeling showed that by the coolant temperature increase up to 127 °C, an average temperature pressure in a heat exchanger-condenser between the refrigerant and air increased. Therefore the amount of waste heat to the atmosphere was significantly increased. This will ensure an efficient operation of a cooling system at an elevated ambient temperature and will improve the weight and size of a cooling system in general

Mathematical model of liquid vapor compression system for multicircuit cooling systems of high mobile platform

© Research India Publications. The descriptions of the structure, the principle of operation and the mathematical model of the liquid-vapor compression cooling system, through which an effective cooling of a mobile platform power plant at elevated ambient temperature is possible. The proposed model allows to simulate the thermodynamic processes of heat and mass transfer and heat transfer, depending on the system load, its design parameters and the material of heat exchangers, the mass flow of refrigerant and coolant flow, taking into account the ambient temperature. The result of mathematical modeling showed that by the coolant temperature increase up to 127 °C, an average temperature pressure in a heat exchanger-condenser between the refrigerant and air increased. Therefore the amount of waste heat to the atmosphere was significantly increased. This will ensure an efficient operation of a cooling system at an elevated ambient temperature and will improve the weight and size of a cooling system in general

Mathematical model of liquid vapor compression system for multicircuit cooling systems of high mobile platform

© Research India Publications. The descriptions of the structure, the principle of operation and the mathematical model of the liquid-vapor compression cooling system, through which an effective cooling of a mobile platform power plant at elevated ambient temperature is possible. The proposed model allows to simulate the thermodynamic processes of heat and mass transfer and heat transfer, depending on the system load, its design parameters and the material of heat exchangers, the mass flow of refrigerant and coolant flow, taking into account the ambient temperature. The result of mathematical modeling showed that by the coolant temperature increase up to 127 °C, an average temperature pressure in a heat exchanger-condenser between the refrigerant and air increased. Therefore the amount of waste heat to the atmosphere was significantly increased. This will ensure an efficient operation of a cooling system at an elevated ambient temperature and will improve the weight and size of a cooling system in general

Simulation of parameters of hydraulic drive with volumetric type controller

© Published under licence by IOP Publishing Ltd. The article presents a mathematical model of volumetric type hydraulic drive controller that allows to calculate the parameters of forward and reverse motion. According to the results of simulation static characteristics of rod's speed and the force of the hydraulic cylinder rod were built and the influence of the angle of swash plate of the controller at the characteristics profile is shown. The results analysis showed that the proposed controller allows steplessly adjust the speed□ of hydraulic cylinder's rod motion and the force developed on the rod without the use of flow throttling