A heat exchanger for cooling air, with a coolant onward-flow connection for feeding liquid coolant for cooling air and a coolant return-flow connection for discharging liquid coolant. For removing ice by melting accumulated ice in the heat exchanger, a heater is provided that is associated with an e
A heat exchanger for cooling air, with a coolant onward-flow connection for feeding liquid coolant for cooling air and a coolant return-flow connection for discharging liquid coolant. For removing ice by melting accumulated ice in the heat exchanger, a heater is provided that is associated with an electrical heating element. An operational safety device prevents overheating of the heater. The operational safety device comprises a fault-current detection device. Such a heater, with a heating element for heating air for subjecting accumulated ice to heated air, and with such an operational safety device is provided. Also, a galley for a commercial aircraft is provided with a receiving space for trolleys, and a cooling device for cooling the receiving space. The cooling device comprises such a heat exchanger for cooling air.
대표청구항▼
1. A heat exchanger for cooling air, comprising: a coolant onward-flow connection for feeding liquid coolant for cooling air,a coolant return-flow connection for discharging liquid coolant,a heater for removing ice by melting accumulated ice in the heat exchanger,an electrical heating element for me
1. A heat exchanger for cooling air, comprising: a coolant onward-flow connection for feeding liquid coolant for cooling air,a coolant return-flow connection for discharging liquid coolant,a heater for removing ice by melting accumulated ice in the heat exchanger,an electrical heating element for melting accumulated ice being associated with the heater, andan operational safety device for preventing overheating of the heater,the operational safety device comprising a fault-current detection device for the detection of electrical fault currents. 2. The heat exchanger of claim 1, wherein the operational safety device comprises a heat conducting element made from an electrically conductive material and connectable to a ground connection, and the heat conducting element is in thermally conductive connection with the heating element. 3. The heat exchanger of claim 2, wherein the fault-current detection device is configured to deactivate the heating element when it registers that at least one of a fault-current limit value relating to an electrical fault current has been exceeded and a heat-conducting element limit-value relating to an electrical current through the heat conducting element has been exceeded. 4. The heat exchanger of claim 3, wherein a fan for generating a flow of forced air through the heat exchanger is associated with the heat exchanger, wherein the fault-current detection device is configured to deactivate the fan only after a minimum period of time has elapsed after the fault-current detection device registers that at least one of a fault-current limit value relating to an electrical fault current has been exceeded and a heat-conducting element limit-value relating to an electrical fault current through the heat conducting element has been exceeded. 5. The heat exchanger of claim 1, wherein the fault-current detection device comprises a circuit breaker for all-pole disconnection of the heating element. 6. The heat exchanger of claim 1, wherein the heating element is a heating mat of a sheet-like design that forms a heating element surface, the heat conducting element comprises a sheet-like design that forms a heat-conducting element surface, and the heating element surface and the heat-conducting element surface are connected so as to contact each other. 7. The heat exchanger of claim 1, wherein the heater comprises a three-phase connection. 8. The heat exchanger of claim 7, wherein the heater comprises a rectifier that on the input side is connected in an electrically conductive manner to the three-phase connection and that on the output side comprises an intermediate circuit capacitor. 9. The heat exchanger of any one of the preceding claims, wherein the heat conducting element is a housing section of the heat exchanger. 10. A heater, for a heat exchanger of claim 1, with a heating element for melting accumulated ice, and with an operational safety device for avoiding overheating of the heater, wherein the operational safety device comprises a fault-current detection device for the detection of electrical fault currents. 11. A galley for a commercial aircraft, comprising: a receiving space for trolleys,a cooling device for cooling the receiving space,the cooling device comprising a heat exchanger for cooling air,the heat exchanger comprising a coolant onward-flow connection for the supply of liquid coolant for cooling air,the heat exchanger comprising a coolant return-flow connection for discharging liquid coolant,the heat exchanger being associated with a heater for removing ice by melting accumulated ice in the heat exchanger,a heating element for melting accumulated ice being associated with the heater, andan operational safety device to prevent overheating of the heater being associated with the heat exchanger,the operational safety device comprising a fault-current detection device for the detection of electrical fault currents.
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이 특허에 인용된 특허 (3)
Buck, Gilbert W., Control system for an aircraft galley cooler.
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