Heating systems – Automatic control – Heat source is a reverse cycle refrigerating system or heat...
Patent
1989-10-31
1991-01-08
Bennet, Henry A.
Heating systems
Automatic control
Heat source is a reverse cycle refrigerating system or heat...
237 123B, 237 123A, G05D 2300
Patent
active
049828959
ABSTRACT:
A heating system for automotive vehicles comprises a heater core utilizing engine coolant, a blower disposed upstream of the heater core, and a closed-loop pipe heating system utilizing exhaust heat from exhaust gas. The pipe heating system comprises an evaporator section disposed in an exhaust gas passage, a condenser section disposed downstream of the heater core, a pipe section defining a first fluid passage from the evaporator section to the condenser section, a return pipe section defining a second fluid passage from the condenser section to the evaporator section, working fluid circulating in a fluid passage defined in the evaporator section and condenser section, and in the first and second fluid passages, sensors for monitoring whether activation of the pipe heating system is required, and flow control means disposed in the return pipe section, for controlling working fluid flow from the condenser section to the evaporator section, in response to signals from the sensors. Optimum heating control is obtained by controlling working fluid flow to the evaporator. The flow control means also operates such that all of the working fluid circulating in the pipe heating system is converged in the evaporator section when atmospheric temperature in the evaporator section is less than a predetermined temperature at which the working fluid transits from a liquid state to a gaseous state, thereby resulting in easy restarting of the system in spite winter conditions wherein the ambient air temperature is particularly low.
REFERENCES:
patent: 4667876 (1987-05-01), Negishi
Chujo Yuji
Noda You
Shimizu Joji
Yamamoto Yasushi
Bennet Henry A.
Nissan Motor Company Limited
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