Technology for Heat-Insulating Elements Production
Development of Construction and Pilot Technology for Production of Heat-Insulating elements for Refrigerating Equipment
Tech Area / Field
- MAN-MAT/Engineering Materials/Manufacturing Technology
- CHE-POL/Polymer Chemistry/Chemistry
3 Approved without Funding
VNIIEF, Russia, N. Novgorod reg., Sarov
- OAO "Polimersintez", Russia, Vladimir reg., Vladimir
- Lyondell Chemical Central Europe GmbH (Moscow Office), Russia, Moscow\nBavarian Center of Applied Energy Research, Germany, Wuerzburg\nBar-Ray Products, Inc., USA, New York
Project summaryProject Tasks.
Wide abundance of foamed polyurethane in different fields of engineering is due to its high operational characteristics, such as high heat-insulation etc. Nevertheless, in some fields of engineering, for example, in refrigerating equipment, use of foamed polyurethane for heat-insulation came to its limit, for further reduction of heat conductivity becomes practically impossible.
Nowadays in domestic refrigerators thickness of foamed polyurethane heat insulation in a space of freezing chamber is 2-3 times larger than that in a space of refrigerating chamber. Upgrade of heat-insulating characteristics will lead either to reduction of consumed refrigerating power, either to increase of its useful space keeping its external dimensions.
It is proposed to make multilayer heat-insulation in a freezing chamber space, i.e. to replace a part of foamed polyurethane with a heat-insulating element showing higher heat-insulating characteristics as compared to foamed polyurethane. Theoretical background for production of such an element are based on opportunity to engineer rather small metal space filled with vacuum. At the same time an internal space is to be filled with porous material to prevent collapse of element under exposure to atmosphere pressure. Besides, in a case of vacuum use, density of heat flow between element walls is determined only by radiation, and when porous body (for example, open-cellular foamed polyurethane) is inserted into internal space, - heat flow must reduce at the expense of change of heat transport mechanism within element.
Development of such a technology will permit to propose to use in industry new heat-insulating elements showing higher heat-insulating characteristics as compared to conventional heat-insulation. This technology may find a wide application in various fields of engineering, for example, in refrigerating industry, in production of consumer’s goods (thermoses), in building, transport.
And above all, even slight reduction of power consumed by refrigerators may give considerable economy of electric power within the country.
Necessity for work performance under the proposed Project is evident: along with solution of technical problem of economic significance, realization of this Project with ISTC support will allow to use highly qualified specialists of VNIIEF, previously engaged in the development of a nuclear weapon.
Development of a structure and pilot technology for reduction of heat-insulating elements of the base of open-cellular foamed polyurethane for use in refrigerating equipment.
– performance of scientific and calculating-experimental works;
– design of specifications and manufacturing, setting up and putting of pilot plants into production;
– development of production technology for heat-insulating elements to use in refrigerating equipment.
Today in Russia works haven’t being conducted on development of production technology for heat-insulating elements with combined use of vacuum and open-cellular foamed polyurethane. To open pores of stiff foamed polyurethane in production of foamed material, – exhaustic, rather expensive and harmful agents are used abroad. Performed works show that it is possible to open pores using non-expensive available and less toxic material.
Performed investigations will allow to propose to put into production the technology for heat-insulating elements, heat conductivity of which (by preliminary investigations) will be less by 5-40% than that of conventional refrigerator heat-insulation.
The Project envisages work performance on development of formulation and production technology for open-porous foamed polyurethane, study of influence of foamed polyurethane properties on thermal conductivity of structural elements, development of structure and technology for production of heat-insulating elements, performance of market and patent investigations, and also estimation of the developed technology and study of possibility to put it into production.
Technical Approach and Methodology.
In the basis of technical approach there is a study of possibility to develop new for Russia technology for production of elements showing higher heat-insulating properties as compared to existing heat-insulating panels used in refrigerating equipment, and also study of the following characteristic set for developed materials structures: strength, heat-insulation, economical. Material study will be performed according to standards, acting in the Russian Federation.
To estimate efficiency for developed technology, it is proposed to develop method for determination of heat losses in heat-insulating elements of different structures.
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