Klymchuk O. Integrated systems of intermittent heat supply for office buildings and educational institutions (theoretical bases, analysis, optimization)

The dissertation is devoted to the decision of the actual problem of implementation of integrated systems of intermittent heat supply with the rational use of the potential of different renewable energy sources (RES), heat accumulators, heating systems that are used to push the over-the-top mode, taking into account mode-operational characteristics and level of thermo-modernization of buildings. The conception of an integrated system of intermittent heat supply that can replace traditional fuels and gives a significant energy saving effect is developed. The pilot installation of intermittent heat supply for the educational establishment was created, allowing validate the adequacy of the proposed models of the system. The mathematical model of the integrated system of intermittent heat supply for public buildings is proposed. This model is confirmed experimentally at the pilot installation, which is been operating during two years in one of the educational buildings of Odessa National Polytechnic University. The rational heat circuit of the integrated system of intermittent heat supply is proposed, in which the underutilization of the technical potential of RES is eliminated. A mathematical model of dynamics of room heating for office buildings is purposed, with the account of level of their thermo-modernization. The adequacy of this model is confirmed experimentally. In addition, the feasibility of combining low- and high inertial thermal processes for push the over-the-top mode is confirmed theoretically and experimentally. All specified allows to reduce the maximum power of the heat generator of integrated system of intermittent heat supply due to the rational use of the heat accumulator. Namely, in non-operating mode, the heat generator works exclusively for charging the heat accumulator, further the temperature potential of heat accumulator is used to compensate for the peak thermal power of the system during the over-the-top push mode. In real conditions of operation of the system the economy of the fuel is equal 10%. Rational conditions for the implementation of the system with heat accumulator with use of the criterion of maximum value of accumulation parameter for displacement of power of traditional heat generators is proved by theoretical and experimental way. Rational conditions of use of heat pump in intermittent heat supply system are defined which opens the additional possibilities for saving of traditional energy (up to 15%) and leads to improving the efficiency of heat pump in standby mode (up to 10%). The influence of level of thermo-modernization of the building at the efficiency of intermittent heat supply system for office buildings and educational institutions is determined. The peculiarities of use of combined thermal insulation, high- and low-inertia devices for pushing the over-the-top mode which reduces duration of mode more than 3 times are established The peculiarities of use of combined thermal insulation and high- and low-inertia devices for pushing the over-the-top mode, which reduces its duration more than 3 times, are established. In addition, the conditions for refusal from the regular mode, allowing to achieve additional energy savings (up to 10 %), is substantiated. Energy saving due to implementation of integrated system of intermittent heat supply comparing with basic heat supply mode from the gas boiler is about 40 %.