Method of thermostatiс control of power plants accumulators at negative ambient temperatures

Аuthors

Zeigarnik Y. A., Kosoi A. S., Popel O. S.^*, Tarasenko A. B.

Joint Institute for High Temperatures of the Russian Academy of Sciences, 13, Izhorskaya str., Moscow, 125412, Russia

*e-mail: O_Popel@oivtran.ru

Abstract

The method of thermostatic control of accumulator batteries, which are parts of power plants that operate at negative ambient temperatures (in particular, at Arctic conditions) is presented. This method is based on using the heat of water phase transition (freezing). The preliminary estimates were conducted for typical independent power plant of 100 kW capacity supplied with corresponding accumulator battery. The object of thermostatic control is placed in a special double-wall container. The space between the walls is filled with freezing water, which has a very high value of the latent heat of phase transition from liquid to solid state (330 kJ/kg). During the time of water freezing a temperature inside the container remains to be more than 0 oC. After freezing the water should be melted. The waste heat of the power plant and that of its cooling system is utilized for this purpose. The time of freezing the water in the container with bare outer walls is about 6 days. This figure can be considerably improved if we cover the container surface with thermal insulating panels and additionally use natural snow coating, which is typical of the Arctic conditions. In this case, we can speak about the freezing time of more than 2-2.5 months. According to the estimates conducted the melting time of the ice formed is approximately 18 h. It is expedient to apply fluorketone type refrigerants (Novec 1230 or its Russian analog FK-5-1-12) as an intermediate coolant that transfers the heat of the engine waste gases to the ice to be melted. These coolants have low freezing point, fireproof, environmentally-friendly and provide acceptable heat transfer rate. Special experiments were conducted that confirmed the effectiveness of these coolants in the regime of subcooled-liquid forced-convection boiling. Corresponding data for removing heat fluxes of up to 1 MW/m2 densities are presented in the paper.

Keywords:

accumulator battery, thermostatic control, phase transition, power plant

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