Wind turbine cooling technologies - Wind Power Generation and Wind Turbine Design - page 636

Figure 15: Schematic diagram of the solar power jet refrigerating engine: 22,
heat accumulator; 23, auxiliary heater; 24, refrigerant; 25, circulating
pump IV; 26, jet apparatus; 27, evaporator; 28, throttle; 29, condenser;
33, fi lter. The remaining symbols have been annotated above.
Similar to the wind turbine introduced in Section 5.1, during the operation, the
secondary refrigerant sequentially fl ows through the heat exchanger outside the gear-
box, the generator and the control converter, removing the heat produced by these
components. The heated secondary refrigerant is then driven to the jet refrigerating
engine by the circulating pump through the carrier pipes and performs heat exchange
with liquid refrigerant in the evaporator. Finally the cooled secondary refrigerant is
then delivered back to the above three heat exchangers to absorb heat. This circulation
cycles to ensure the durable and secure operation of the wind turbine.
In the operation of the jet refrigerating engine, the solar thermal collector con-
verts the solar energy into heat energy, leading to a rise of the heat storage agent in
it. The heat is then delivered by the heat storage agent and stored in the heat accu-
mulator. The heat-released heat storage agent fl ows back to the heat accumulator
driven by a circulating pump, thus completes a circuit of solar energy conversion.
Meanwhile, the refrigerant absorbs heat in the heat accumulator and gasifi es and
thus supercharges the pressure. The refrigerant is then ejected through the jet
apparatus, leaving a low pressure close to vacuum at the jet tip. The low pressure
steam refrigerant in the evaporator is thus drawn into the jet apparatus due to the
pressure difference. The mixed steam refrigerant from the jet apparatus is then
ejected into the condenser and performs heat exchange with the cooling medium