| Patent application number | Description | Published |
|---|
| 20090045625 | Cogeneration system - In a cogeneration system having a generation unit comprising a generator connectable to an AC power feed line between a commercial power network and an electrical load, and an internal combustion engine for driving the generator and having a coolant circulation passage through which a coolant circulates, there are provided a first heat exchanger installed at the coolant circulation passage of the engine to exchange heat with the coolant, a blower that supplies intake air to the first heat exchanger to exchange heat and heat-exchanged hot air to a hot-air passage, a selector comprising a damper that selectively connects the hot-air passage to a room or to exterior, and a controller that controls operation of the selector based on thermal demand, i.e., to lead the hot air to the exterior when there is no thermal demand. | 02-19-2009 |
| 20090045626 | Cogeneration system - In a cogeneration system having at least with a generation unit comprising a generator connectable to an AC power feed line between a commercial power network and an electrical load, an internal combustion engine for driving the generator, and a battery, the cogeneration system producing hot air/water through exchange heat generated by the engine to supply to a thermal load, it is determined whether it is a predetermined self-diagnosis time, and when the result is affirmative, the generation unit is operated by an output of the battery and self-diagnoses is made on at least one of output voltage of the battery, a speed of the engine and an output of the generator, when it is determined to be the predetermined self-diagnosis time. | 02-19-2009 |
| 20090127867 | Method and apparatus for controlling cogeneration system - In an apparatus (and a method) for controlling a cogeneration system equipped with a generation unit having a generator connectable to an AC power feed line between a commercial power network and an electrical load and an internal combustion engine for driving the generator, and a heat exchanger that exchanges heat with coolant of the engine with exhaust heat from the engine to warm up the coolant, there are provided with an exhaust gas temperature sensor that detects temperature of exhaust gas passing the heat exchanger, a temperature comparator that compares the exhaust gas temperature with a predetermined value and an operation stopper that stops the operation of the cogeneration system when the exhaust gas temperature is found to be less than the predetermined value. With this, it becomes possible to prevent moisture in the exhaust gas from being condensed and accumulated in the exhaust-gas heat exchanger. | 05-21-2009 |
| 20090127868 | Method and apparatus for controlling cogeneration system - In an apparatus (and a method) for controlling a cogeneration system equipped with a generation unit having a generator connectable to an AC power feed line between a commercial power network and an electrical load and an internal combustion engine driving the generator, and a heat exchanger that exchanges heat between coolant and exhaust heat from the engine, there are provided with a condensate water hose discharging condensate water generated by condensation of moisture in exhaust gas, a hose temperature sensor detecting temperature in the hose, an exhaust gas temperature sensor detecting temperature of the exhaust gas from the engine and an exhaust gas blowout discriminator discriminating that the exhaust gas blows out through the hose when a difference between the hose temperature and the exhaust gas temperature is found to be less than a predetermined value. With this, exhaust gas leakage caused by blowout can be easily detected. | 05-21-2009 |
| 20090295157 | Cogeneration system - In a cogeneration system having three generation units each equipped with a generator and an internal combustion engine, a single hot water tank is prepared for the three generation units to contain hot water heated by exhaust heat of the engine. The temperature of the hot water contained in the tank and a power demand of an electrical load are detected. Then, the number of the generation unit or units to be operated is determined based on the detected power demand when the detected hot water temperature is equal to or less than a first predetermined value, and operation of the generation unit or units determined to be operated is controlled, thereby reducing a space for the installment of the tank and heat loss from the tank. | 12-03-2009 |
| 20090295158 | Cogeneration System - In a cogeneration system having a generation unit equipped with a generator and an internal combustion engine, there is installed with a hot water unit including a first flow channel connecting a water supply source with a thermal load, a heat exchanger exchanging heat between water flowing the first flow channel and engine coolant, a first electromagnetic solenoid regulating flow rate of the water heated by the heat exchanger, a second flow channel connected to the first flow channel, a boiler heating water flowing through the second flow channel, and a second electromagnetic solenoid regulating flow rate of the water to be heated by the boiler. The temperatures of the engine coolant and water at the first and second flow channel joint are detected and operation of the first and second valves is controlled based on the detected temperatures, rendering hot water tank unnecessary, thereby achieving the compact structure. | 12-03-2009 |
