A single nonfired heat source, such as a diesel engine, drives a hydraulic pump. The hydraulic pump in turn is coupled in a hydraulic circuit with a back-pressure valve which loads the hydraulic pump and hence the diesel engine. The engine also circulates a heat exchanging fluid, such as engine coolant through a second circuit. Water or engine coolant is circulated through the second circuit by means of a pump driven by the diesel engine. An exhaust gas heat exchanger coupled to the exhaust gases from the engine may also be included within the water coolant, the exhaust gases or both, and is then transferred to noncirculating deicing fluid in a storage tank. Heat developed within the hydraulic circuit which loads the engine is also transferred to the noncirculating fluid in the storage tank. The heated noncirculating fluid may be gently stirred to increase heat exchange efficiency and then either pumped directly to the utilization site from the storage tank or pumped in a single pass through a heat exchanger thermally coupled through the water coolant heat exchanger, hydraulic heat exchanger, or both, and thence to the utilization site.
In direct fired fluid burner heater of the type where fuel is continuously injected and burned at one end of a cylindrical combustion chamber and combustion gases discharged at an opposite open end pass through a heat exchanger for heating a circulating medium, and where high heat capacity is achieved for a given chamber size by swirling the flame in the combustion chamber, acoustical low frequency buzzing is controlled by restricting the discharge area through which exhaust gases flow downstream of the heat exchanger.
The invention is a system for heating aircraft deicing fluid. The system is an aircraft deicer such as shown in FIG. 2 which includes an engine 210. The deicer systems comprises a tank 270 for holding deicing fluid. First pump means 250,252 and 254 are driven by engine 210 and pump deicing fluid from tank 270 through piping or conduit 266,264,230. Backpressure valve means 251,253,255 is positioned the outlet of the first pump means 250,252,254 respectively, to continuously, substantially and directly heat deicing fluid to a temperature sufficient to deice the aircraft. The system further comprises second pump means 212, 232 for directing deicing fluid through engine 210 to pick up heat rejected by engine 210. Once the deicing fluid has been pumped through engine 210, piping or a conduit means 216,222,228,230,266,264 connects the output of the second pump means 212,232 to the inlet of the first pump means 250,252 and 254.
A single nonfired heat source, such as a diesel engine, drives a hydraulic pump. The hydraulic pump in turn is coupled in a hydraulic circuit with a back-pressure valve which loads the hydraulic pump and hence the diesel engine. The engine also circulates a heat exchanging fluid, such as engine coolant through a second circuit. Water or engine coolant is circulated through the second circuit by means of a pump driven by the diesel engine. An exhaust gas heat exchanger coupled to the exhaust gases from the engine may also be included within the water coolant, the exhaust gases or both, and is then transferred to noncirculating deicing fluid in a storage tank. Heat developed within the hydraulic circuit which loads the engine is also transferred to the noncirculating fluid in the storage tank. The heated noncirculating fluid may be gently stirred to increase heat exchange efficiency and then either pumped directly to the utilization site from the storage tank or pumped in a single pass through a heat exchanger thermally coupled through the water coolant heat exchanger, hydraulic heat exchanger, or both, and then to the utilization site.