摘要:
A command device (13) includes a sensor (15,16) for the measurement of a measured value VM of a characteristic C of a fluid FR,A and a comparison (14) of the measured value VM of the characteristic C of the fluid FR,A with at least two step-values VSmin, VSmax of the characteristic C. The command device (13) includes an upstream temperature sensor (20) to be positioned upstream the evaporator (12) according to the air flow direction (6) to measure an upstream temperature T2 of the air flow (3) and give an information (18) which is taken into account by the command device (13) in order to determine the step-values VSmin, VSmax of the characteristic C.
摘要:
The subject of the invention is a device (5) for expanding a refrigerant fluid comprising, on the one hand, a first inlet (8) of the expansion device and a first outlet (9) of the expansion device which are connected by a first refrigerant circulation duct (11), the first refrigerant circulation duct (11) comprising an upstream part (22) and a downstream part (25) which parts are placed in communication by a first communication passage (18) and, on the other hand, a second inlet (12) of the expansion device and a second outlet (13) of the expansion device which are connected by a second refrigerant circulation duct (14). The expansion device (5) comprises a regulating means (15) that regulates an expansion of the refrigerant fluid and comprises a first needle valve (16) housed inside the upstream part (22) of the first refrigerant flow duct (11), the first needle valve (16) being connected by a first connecting rod (19) to a thermostatic sensor (17) in communication with the second refrigerant flow duct (14), the first needle valve (16) being able to allow or prevent refrigerant fluid from circulating through the first communicating passage (18). The regulating means (15) comprises a measurement means (23) for measuring the pressure of the refrigerant fluid entering the evaporator (Pse) which pressure measurement is taken at the first outlet (9) of the expansion device.
摘要:
A device for expanding a refrigerant fluid has a first inlet and a first outlet which are connected by a first refrigerant circulation duct. The first refrigerant circulation duct has an upstream part and a downstream part which parts are placed in communication by a first communication passage. The device also has a second inlet and a second outlet which are connected by a second refrigerant circulation duct. The device regulates an expansion of the refrigerant fluid and has a first needle valve housed inside the upstream part of the first refrigerant flow duct connected by a first connecting rod to a thermostatic sensor in communication with the second refrigerant flow duct that allows or prevents refrigerant fluid from circulating through the first communicating passage. The device also measures the pressure of the refrigerant fluid entering the evaporator (Pse) which pressure measurement is taken at the first outlet.
摘要:
The invention relates to a heating, ventilating and/or air conditioning system with a main air conditioning loop (10) for a refrigerant including at least one compressor (11), a condenser (12), an expansion device (13) and an evaporator (14), a cold storage heat exchanger (21) suitable for storing cold during operation of the compressor (11), and a secondary air-conditioning loop (20a) comprising the cold storage heat exchanger (21). The secondary air-conditioning loop (20a) is suitable to cool the evaporator (14) when the compressor (11) is out of operation. The secondary air-conditioning loop (20a) includes a fluid circulation branch disposed in parallel with a main air conditioning loop (10) common section including at least the evaporator (14). The fluid circulation branch contains a cold production element (21) able to cool the refrigerant toward the evaporator. The invention is particularly dedicated to heating, ventilating and/or air conditioning systems in “Stop and Start” cars.
摘要:
Evaporator, notably for motor vehicle air-conditioning circuit. According to the invention, the evaporator (1), which comprises three layers—upstream (2), intermediate (3) and downstream (4)—through which there flows a coolant that enters the evaporator (1) via the intermediate layer (3) and leaves the evaporator via the upstream layer (2) to cool an air flow (A) passing in succession across said upstream (2), intermediate (3) and downstream (4) layers, comprises means (5E) for inducing a pressure drop between the outlet of the intermediate layer (3) and the inlet of the downstream layer (4).
摘要:
Evaporator, notably for motor vehicle air-conditioning circuit. According to the invention, the evaporator (1), which comprises three layers—upstream (2), intermediate (3) and downstream (4)—through which there flows a coolant that enters the evaporator (1) via the intermediate layer (3) and leaves the evaporator via the upstream layer (2) to cool an air flow (A) passing in succession across said upstream (2), intermediate (3) and downstream (4) layers, comprises means (5E) for inducing a pressure drop between the outlet of the intermediate layer (3) and the inlet of the downstream layer (4).
摘要:
A heat exchanger for a heat transfer fluid circuit comprising ducts for the circulation of the heat transfer fluid, which are inserted between an inlet and an outlet, is described. Cavities designed to contain a heat storage fluid adjacent to the cooling fluid circulation ducts and associated with heat-exchanger surfaces, so that heat storage fluid is capable of exchanging heat with the air flow, if the circulation of the heat transfer fluid is stopped, are also described.
摘要:
Heat exchanger with thermal inertia for a heat transfer fluid circuit, particularly of a motor vehicle A heat exchanger for a heat transfer fluid circuit comprising ducts for the circulation of the heat transfer fluid, which are inserted between an inlet and an outlet, is described. Cavities designed to contain a heat storage fluid adjacent to the cooling fluid circulation ducts and associated with heat-exchange surfaces, so that heat storage fluid is capable of exchanging heat with the air flow, if the circulation of the heat transfer fluid is stopped, are also described.
摘要:
The invention relates to a ventilation, heating and/or air conditioning equipment for the passenger compartment of a motor vehicle provided with a main thermodynamic loop comprising at least, according to the direction of flow of a refrigerant fluid: a compressor (14), a condenser (16), an expansion device (20), and a main air-cooling evaporator (22). According to the invention, the equipment furthermore comprises a secondary fluid loop for the flow of a heat conductor fluid coupled with the main thermodynamic loop in order to cool the heat conductor fluid when this is desirable.