Trushliakov E. Scientific and Engineering Basics of the Two-Stage Air Conditioning Systems of Central and Combined Types.

The dissertation is devoted to the development of scientific and technical bases of two - stage air conditioning systems of central and combined types. The scientific and applied problem of development of the advanced step air conditioning systems (ACS) and methodology of their rational designing is solved. This makes it possible to coordinate the installed refrigeration capacity with the current heat loads by rationally distributing it between stages, ensuring the reduction of the installed cooling capacity and efficient operation of the ACS of both central and combined type. Methods for determining the rational design cooling capacity of the ACS, which provides close to the maximum annual cold production at minimum unproductive refrigeration costs, and the delimitation of the design refrigeration capacity between the ranges of unstable and stable heat loads. Principles and methods and circuit solutions of two-stage ACS with distribution of cooling productivity between stages according to the current load are developed, providing close to the maximum annual production of cold atthe reduced by 15… 25% design cooling productivity in comparison with traditional designing, proceeding from the maximum current loading. The concept of ACS cold supply is developed according to the principle of self-filling of air cooler coils with refrigerant in accordance with current heat loads, which provides intensive heat transfer and heat flux density.