Abstract:
A transportation refrigeration unit (TRU) system is provided and includes a damper assembly configured to direct air flows through first or second pathways and an evaporator disposed in the first pathway, a coil element surrounded by phase change material (PCM) and disposed in the second pathway and a routing assembly configured to direct refrigerant through the evaporator or the coil element. With the PCM pre-cooled, the damper and routing assemblies are controllable to respectively direct the air flows through the first pathway and the refrigerant through the evaporator when first conditions are met and to respectively direct the air flows through the second pathway when second conditions are met.
Abstract:
A control method for a vehicle air-conditioning system and a vehicle air-conditioning system are provided. The control method comprises: acquiring an actual superheat degree, a preset superheat degree and an opening degree of an electronic expansion valve; and determining whether the electronic expansion valve is in a fault state or not according to the actual superheat degree, the preset superheat degree and the opening degree of the electronic expansion valve; if yes, outputting a control signal to an executive control mechanism to enable same to adjust a parameter of a device affecting a change of the actual degree of superheat in a vehicle air-conditioning system so as to adjust the superheat degree of the vehicle air-conditioning system.
Abstract:
A method for controlling a superheat degree of a vehicle air-conditioning system, and a vehicle air-conditioning system are provided. The method comprises: acquiring an actual superheat degree in real time, a preset superheat degree and a feed-forward information which influences a change of the actual superheat degree; and adjusting an opening degree of an electronic expansion valve in real time according to the actual superheat degree, the preset superheat degree and the feed-forward information that are acquired, so as to control the superheat degree of the vehicle air-conditioning system.
Abstract:
A compressed air supply apparatus includes an air compressor for compressing air to at least atmospheric pressure, a tank for storing the compressed air and supplying the compressed air, via a supply port, to various devices that use the compressed air as a working fluid, a first pipe that connects the air compressor to the tank, a heat pump including an evaporator for cooling at least a part of the first pipe, a selection device for selecting whether a cool air cooled by the evaporator, which is fluidly distinct from the compressed air, is introduced into a vehicle interior or discharged outside of the vehicle interior, and a control device configured to control the selection device so that the cool air is introduced into the vehicle interior when an air conditioner switch is turned ON and discharged outside of the vehicle interior when the air conditioner switch is turned OFF.
Abstract:
A vehicle air conditioner (1A) includes a heat pump circuit (2) including a compressor (11), an outdoor heat exchanger (13), an expansion mechanism (14), a first indoor heat exchanger (15), and a second indoor heat exchanger (16). The flow direction of a refrigerant in the heat pump circuit (2) is switched, by a switching member (12A), between a first direction in which the refrigerant discharged from the compressor (11) passes through the outdoor heat exchanger (13), the expansion mechanism (14), the first indoor heat exchanger (15), and the second indoor heat exchanger (16) in this order and returns to the compressor (11), and a second direction in which the refrigerant discharged from the compressor (11) passes through the first indoor heat exchanger (15), the expansion mechanism (14), the outdoor heat exchanger (13), and the second indoor heat exchanger (16) in this order and returns to the compressor (11). In the above-described configuration, the control of the expansion mechanism can be simplified during a heating operation and a cooling operation by handling a single expansion mechanism.
Abstract:
A refrigeration system (10) for a motor vehicle with a mid or rear engine has an air-conditioning compressor (12) can be driven by the mid or rear engine for delivering a coolant. At least one evaporator (16) is provided for cooling a frontal part of the passenger compartment by evaporating the coolant. At least one condenser (22) condenses the coolant and a heat exchanger (20) cools the coolant flowing to the evaporator (16) with cold from the coolant coming from the evaporator (16). A control unit (26) limits a temperature of the coolant entering the air-conditioning compressor (12) to avoid a temperature that is damaging for the air-conditioning compressor (12), while also taking account of heating of the coolant along a particularly long flow path from the rear area (18) of the motor vehicle to the air-conditioning compressor (12) arranged at the mid or rear engine.
Abstract:
A vehicle air conditioner (1A) includes a heat pump circuit (2) including a compressor (11), an outdoor heat exchanger (13), an expansion mechanism (14), a first indoor heat exchanger (15), and a second indoor heat exchanger (16). The flow direction of a refrigerant in the heat pump circuit (2) is switched, by a switching member (12A), between a first direction in which the refrigerant discharged from the compressor (11) passes through the outdoor heat exchanger (13), the expansion mechanism (14), the first indoor heat exchanger (15), and the second indoor heat exchanger (16) in this order and returns to the compressor (11), and a second direction in which the refrigerant discharged from the compressor (11) passes through the first indoor heat exchanger (15), the expansion mechanism (14), the outdoor heat exchanger (13), and the second indoor heat exchanger (16) in this order and returns to the compressor (11). In the above-described configuration, the control of the expansion mechanism can be simplified during a heating operation and a cooling operation by handling a single expansion mechanism.
Abstract:
The invention relates to an air conditioning system, especially a motor vehicle air conditioning system, that can be operated as a heat pump. Said system comprises a compressor (2), a heating body (3), a throttle element (4), and an evaporator (6), the compressor (2) having a variable stroke. The throttle element (4) is especially embodied as a controllable expansion valve (5) that contributes to the regulation of the heating capacity during the operation of the heat pump.
Abstract:
An automobile air conditioning system controls the high pressure of the refrigeration cycle in a wide range of airflows from a low airflow region during an intermediate period to a high airflow region. When a dehumidifying mode is selected, the target high pressure at which the cycle efficiency calculated from a gas cooler outlet refrigerant temperature is maximized is defined as a target value to a valve such as a heating variable throttle valve to control the high pressure of the refrigeration cycle to the target value. This permits control such that the cycle efficiency of the refrigeration cycle is maximized in a wide range of airflow from a low airflow region during an intermediate period to a high airflow region at a relatively low, about 10° C., outside air temperature.
Abstract:
The object of the present invention is to provide a method of operating a refrigeration cycle which is capable of preventing oil from staying in an evaporator and ensures high coefficient of performance as well as sufficient circulation of oil. An electronic expansion valve is controlled such that during normal operation, refrigerant is always in a superheated state at the outlet of an evaporator, and the refrigerant is periodically forced to have negative superheat for a predetermined time by a superheat control device. Thus, during normal operation, the refrigerant sucked into a variable displacement compressor always has superheat, whereby the refrigeration cycle can operate with high coefficient of performance and an engine driving the variable displacement compressor can be operated at high fuel efficiency. Also, the refrigerant is temporarily controlled so as to have negative superheat. Accordingly, lubricating oil stayed in the evaporator can be made to flow out to the variable displacement compressor, thus making it possible to prevent the compressor from seizing due to shortage of the lubricating oil.