I. Introduction
As a result of the gradual reduction of heat demand from large central sources, the construction of new cogeneration plants is starting to focus on lower outputs. Such stations are generally constructed from modular cogeneration units with combustion piston engines for natural gas. The advantage of these units is the short starting time, high electrical efficiency and almost unlimited variability in the construction of the cogeneration station. Another advantage of these units is the transfer of heat output by water, usually with a temperature gradient of 90/70 °C. These heating water parameters are suitable for accumulation in construction and production-friendly water storage tanks, which allow the full load of the cogeneration system to achieve maximum electrical efficiency. The principles of cogeneration plants and its optimal work [1], [2]. Specific micro combined heat and power principles and applications possibilities [3].