Abstract:
A heat pump system for a vehicle which uses an evaporator of an air-conditioning case for common use in an air-conditioning mode and in a heat pump mode for cooling and heating so as to reduce weight and manufacturing costs. The heat pump system can be applied without any change in structure of the air-conditioning case, and can be operated even at low temperature without any influence of outdoor temperature because the heat pump system uses waste heat of an engine so as to enhance fuel efficiency and increase heating performance and efficiency.
Abstract:
A positive temperature coefficient heater includes PTC elements embedded in adjacent heat rods, the PTC elements of the adjacent heat rods include center lines mismatched with each other and configured to minimize regions in which the PTC elements are overlapped with each other in the heat rods in which a plurality of PTC elements spaced apart from each other so as to form columns and rows and arranged in a single layer are embedded.
Abstract:
A heat pump system for a vehicle delays the change of the direction of a directional valve for a given period of time and then conducts the change of the direction of the directional valve, upon receiving the mode change signal between an air conditioner mode and a heat pump mode, thus preventing the generation of the noise and vibration caused by the differential pressure of a refrigerant.
Abstract:
Disclosed herein is a method for controlling an electromotive compressor in a heat pump system for a vehicle. In accordance with an embodiment of the present invention, an unexpected cutoff of a compressor attributable to overload and the generation of noise and vibration attributable to frequent restarts can be prevented by controlling the number of rotations of the compressor within a specific range based on the discharge pressure of the compressor.
Abstract:
A heat pump system for a vehicle includes a dehumidification line for supplying some refrigerant circulating in a refrigerant circulation line to an evaporator before the refrigerant is introduced into an exterior heat exchanger after passing a first expansion means so as to dehumidify the interior of the vehicle in a heat pump mode, thereby allowing the refrigerant to smoothly flow to the evaporator at a low pressure through the dehumidification line before the refrigerant is introduced into the exterior heat exchanger which has a higher pressure than the evaporator when the interior of the vehicle is dehumidified, and smoothly dehumidifying the inside of the vehicle.
Abstract:
A heat pump system for a vehicle includes a dehumidification line for supplying some refrigerant circulating in a refrigerant circulation line to an evaporator before the refrigerant is introduced into an exterior heat exchanger after passing a first expansion means so as to dehumidify the interior of the vehicle in a heat pump mode, thereby allowing the refrigerant to smoothly flow to the evaporator at a low pressure through the dehumidification line before the refrigerant is introduced into the exterior heat exchanger which has a higher pressure than the evaporator when the interior of the vehicle is dehumidified, and smoothly dehumidifying the inside of the vehicle.
Abstract:
A positive temperature coefficient heater includes PTC elements embedded in adjacent heat rods, the PTC elements of the adjacent heat rods include center lines mismatched with each other and configured to minimize regions in which the PTC elements are overlapped with each other in the heat rods in which a plurality of PTC elements spaced apart from each other so as to form columns and rows and arranged in a single layer are embedded.