THE DEFINITION OF THE FUEL CONSUMPTION IN THE SYSTEM OF SEQUENTIALLY CONNECTED HEAT PUMPS IN ENERGY-EFFICIENT MODE OF OPERATION
Considered heating system, consisting of two heat pumps with a series-connected evaporators and condensers. This connection scheme allows to achieve the conditions that the temperature of the condensation are very close to the coolant temperature at each heat pump. The most favorable mode of operation of the station relative to the order of series-connected heat pumps, at the outlet of the capacitors which is the difference between the temperatures of the coolant and refrigerant are different. Given several options for the ratio of the parameters of the system. The first time that the efficiency and the finite temperature difference between working fluid and the coolant of the first heat pump slightly more than the same values of the other. The second case in which the efficiency of the first heat pump to a greater extent differs from the value of another. On the basis of the mathematical model with the use of perturbation theory analytical dependences of the temperatures of condensation of working fluids heat pumps that minimize fuel consumption. Using results, it is possible to determine the influence of various parameters in a thermal power plant, consisting of heat pumps, condensers which are connected in series, and evaporators in parallel, and the peak boiler to cover the load of heating and hot water supply