Refrigeration engineering and technology

9-15

Authors: A. S. Titlov, Yu. A. Ocheretyanyi

The study is dedicated to the engineering principles development of absorption type household refrigeration sets creation. Research objects are absorption refrigerating devices placed on small ships with the cooling chamber volume from 35 to 40 dm3, that are extremely exposed to external dynamic effects (rolling, shake, roll and pitch). It is shown that at large amplitudes of wind waves on small ships special constructions in which are provided the elements to prevent the adverse effects of pitching on the hydrodynamics of the working fluid flows should be applied.

27-31

Authors: N. A. Kolesnychenko, N. V. Volgusheva, I. L. Boshkova

Modeling of high intensity heat propagation processes in which the possible violation of the linear relationship between heat flux and temperature gradient is particularly complex. In this case the heat flux density is determined by the generalized Fourier law which takes into account relaxation processes. To estimate the contribution of relaxation phenomena of the body excessive temperature for the first kind boundary conditions was calculated. The possibility of getting on the thermal state of the body of data for any arbitrarily small values of the Fourier numbers is determined. Utilization of analytical functions which are based on hyperbolic heat equation, enables more accurate calculation of the temperature field in view of the relaxation processes and define the boundaries of the thermal front. It is shown that at the Fourier numbers close to the relaxation of the Fourier numbers, coordinate of the thermal layer is almost identical with the body surface. Estimated body temperatures in the first stage taking into consideration relaxation phenomena and on the simplified procedure demonstrate a marked divergence, however at the end of the first stage and at the second stage the temperatures correlation is satisfactory. Good comparability is observed in close proximity to the surface, the nature of changes in temperature coincides within the same thermal layer.

36-40

Authors: D. О. Pupkov

Development of a parabola-cylindrical solar heater designed for heating and cooking food using solar energy is presented in the study. The design consists of a reflector, as parabola-cylindrical lens and re-ceiver as skewers for food. Reflector is made of flexible materials but also has an advantage - resistance to external influences. Simple mount design allows collecting the heater into the drawing tube, the weight of which doesn’t exceed three kilograms, making the device convenient for transportation and in use. This is a special device due to which it is possible to concentrate solar radiation in the desired point and to reach the necessary temperatures suitable for heating and cooking of foodstuffs. The heater comfortable design has been shown and calculation features of basic geometric parameters of the parabola-cylindrical solar heater are given. The comparison with existing prototypes is given.

47-51

Authors: V. Kogut, I. Butovskyi, V. Bushmanov, M. Khmelniuk

Despite development of atomic and alternate power engineering’s, combustion of organic combustibles are one of key sources of power generation. Usage of this radiant are conjugate with venting is of flue gases which one composition gone into different chemical joints. Making of efficient purification methods of flue gases a front are more their venting, despite a long experience of application in the industrial purposes, remained the actual task. Of the modern perspective purification methods application of the ejector screen are one. Authors had framed a hydra a dynamic model of the ejector screen. Computer probe of passing of gases through the ejector screen displayed availability of padding hydrodynamic Coanda effect who, presumptively, increased a level of settling-out of cooled easily condense builders of flue gases.