Tumble dryer comprising a heat pump and heating system and method for operating the same
First Claim
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1. A dryer, comprising:
- a drying chamber for articles to be dried;
a controller;
a heat pump;
a heat exchanger;
a heater which heats process air from the heat pump, the heater having a first heating stage and a second heating stage;
a first fan to direct heated process air to the drying chamber, a second fan to direct ambient air to the heat exchanger, and a third fan to direct air to the heat pump;
a thermostatic switch connected on the heat pump and configured to switch off the second heating stage when a measured temperature at the heat pump one of reaches and exceeds a preset maximum value Tmax such that process air from the heat pump is heated by the first heating stage.
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Abstract
A tumble dryer having a drying chamber for articles to be dried; a process-air duct; a heater arranged to heat process air, wherein the heater is a two-stage heater having a first heating stage in a first circuit and a second heating stage in a second circuit that is parallel to the first circuit; a first fan to direct heated process air over the articles to be dried in the drying chamber; a heat pump having a heat sink, a heat source and a heat transfer device; a controller; and a thermostatic switch arranged in the first circuit or the second circuit, wherein the thermostatic switch is thermally coupled to the heat pump.
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Citations
19 Claims
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1. A dryer, comprising:
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a drying chamber for articles to be dried; a controller; a heat pump; a heat exchanger; a heater which heats process air from the heat pump, the heater having a first heating stage and a second heating stage; a first fan to direct heated process air to the drying chamber, a second fan to direct ambient air to the heat exchanger, and a third fan to direct air to the heat pump; a thermostatic switch connected on the heat pump and configured to switch off the second heating stage when a measured temperature at the heat pump one of reaches and exceeds a preset maximum value Tmax such that process air from the heat pump is heated by the first heating stage. - View Dependent Claims (2)
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3. A tumble dryer, comprising:
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a drying chamber for articles to be dried; a process-air duct; a heater arranged to heat process air, wherein the heater is a two-stage heater having a first heating stage in a first circuit and a second heating stage in a second circuit that is parallel to the first circuit; a first fan to direct heated process air over the articles to be dried in the drying chamber; a heat pump having a heat sink, a heat source and a heat transfer device; a controller; and a thermostatic switch arranged in one of the first circuit and the second circuit, wherein the thermostatic switch is thermally coupled to the heat pump and switches and opens one of the first circuit and the second circuit when a measured temperature in the heat pump one of reaches and exceeds a preset maximum value Tmax. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for operating a tumble dryer having a drying chamber for articles to be dried, a process-air duct;
- a heater arranged to heat process air, wherein the heater is a two-stage heater having a first heating stage in a first circuit and a second heating stage in a second circuit that is parallel to the first circuit;
a first fan to direct heated process air over the articles to be dried in the drying chamber;
a heat pump having a heat sink, a heat source and a heat transfer device;
a controller; and
a thermostatic switch arranged in one of the first circuit and the second circuit, wherein the thermostatic switch is thermally coupled to the heat pump;
the method comprising;operating the heater having the first heating stage and the second heating stage; and switching the thermostatic switch and opening one of the first circuit and the second circuit when a measured temperature in the heat pump one of reaches and exceeds a preset maximum value Tmax. - View Dependent Claims (14, 15, 16)
- a heater arranged to heat process air, wherein the heater is a two-stage heater having a first heating stage in a first circuit and a second heating stage in a second circuit that is parallel to the first circuit;
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17. A dryer, comprising:
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a drying chamber; a controller; a heat pump having a heat sink, a heat source and a heat transfer device; a heater which heats process air from the heat pump, the heater having a first heating stage and a second heating stage in parallel with the first heating stage and with a greater power than the first heating stage; a heat exchanger located in at least one of a process-air duct and a cooling-air duct; and a thermostatic switch connected on the heat pump and configured to switch off the second heating stage when a measured temperature at the heat pump one of reaches and exceeds a preset maximum value Tmax such that process air from the heat pump is heated by the first heating stage, and switch on the second heating stage when a measured temperature at the heat pump one of reaches and falls below a preset minimum value Tmin such that process air from the heat pump is heated by the first heating stage and the second heating stage. - View Dependent Claims (18, 19)
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Specification