摘要:
The invention proposes an air conditioning system for motor vehicles which is fitted with an injection computer and an electronic control device. The system comprises a first measuring member suitable for supplying a value relating to the pressure of the fluid at a first point in the air conditioning circuit which is situated between the outlet of the expansion member and the outlet of the evaporator, and a second measuring member suitable for supplying a value relating to the pressure of the fluid at a second point in the air conditioning circuit which is situated at the inlet to the compressor. The electronic control device makes use of the solution of an equation which relates the mass flow rate of the refrigerant fluid to the difference in pressure between the first point and the second point in order to calculate an estimate of a magnitude relating to the refrigerant fluid.
摘要:
An expansion device, intended for installation in an air conditioning system with a supercritical refrigerant fluid (FR), is described. The expansion device (12) comprises a body (120) through which refrigerant fluid passes, equipped with an inlet chamber (1210) into which the refrigerant fluid arrives and an outlet chamber (1230) through which the refrigerant fluid departs. The expansion device further comprises a set of expansion means to allow the refrigerant fluid to pass from the inlet chamber (1210) to the outlet chamber (1230), comprising a variable expansion means (1212) comprising a first orifice (34) and an adjusting screw (134) suitable for adjusting the flow section of the first orifice (34); and, a fixed expansion means comprising a second orifice (35) with a fixed flow section.
摘要:
The invention proposes an expansion device, intended for installation in an air conditioning system with a supercritical refrigerant fluid (FR). The expansion device (12) comprises a body (120) through which the refrigerant fluid is to pass, equipped with an inlet chamber (1210) into which the refrigerant fluid arrives and an outlet chamber (1230) through which the refrigerant fluid departs. The expansion device further comprises a set of expansion means to allow the refrigerant fluid to pass from the inlet. chamber (1210) to the outlet chamber (1230). These expansion means comprise: variable expansion means (1212) comprising a first orifice (34) and an adjusting screw (134) suitable for adjusting the flow section of the first orifice (34), and fixed expansion means comprising a second orifice (35) with a fixed flow section.
摘要:
The invention proposes an air conditioning installation furnished with an injection computer (42), with an air conditioning apparatus and with an electronic control device (401). The installation furthermore comprises measurement facilities making it possible to establish values relating to the temperature of the external air stream at the inlet of the condenser, to the pressure at the outlet of the compressor (123), and to the pressure at the inlet of the compressor (122). The electronic control device (401) implements the solving of a linear equation, relating the mass flow rate of the refrigerant to the values measured by the measurement facilities so as to calculate an estimate of a quantity relating to the refrigerant. On the basis of this quantity, the electronic device can estimate the power absorbed by the compressor (14).
摘要:
The invention proposes an air conditioning installation furnished with an injection computer (42), with an air conditioning apparatus and with an electronic control device (401). The installation furthermore comprises measurement facilities making it possible to establish values relating to the temperature of the external air stream at the inlet of the condenser, to the pressure at the outlet of the compressor (123), and to the pressure at the inlet of the compressor (122). The electronic control device (401) implements the solving of a linear equation, relating the mass flow rate of the refrigerant to the values measured by the measurement facilities so as to calculate an estimate of a quantity relating to the refrigerant. On the basis of this quantity, the electronic device can estimate the power absorbed by the compressor (14).
摘要:
An air conditioning unit including an expansion device (4) of the refrigerating fluid loop controlled to set the internal heat exchanger efficiency &eegr;, represented by the equation: &eegr;=TccTsc/TsrTsct, wherein: TccTsc and Tsr are respectively temperatures at the compressor input (1), and at the evaporator output (5) and at the fluid cooler output (2), at a reference value such that the fluid leaves the evaporator in a completely gaseous state and without overheating.
摘要:
The invention proposes a pressure-reducing device designed to be installed in an air conditioning circuit operating with cooling fluid (FR) and including a housing suited to be traversed by cooling fluid under the control of a needle valve (134). The pressure-reducing device moreover includes a bulb (200) filled with a control fluid (FC) exerting a control pressure on a membrane (33) as a function of ambient conditions, the aforementioned membrane being suitable for acting on the needle valve as a function of the control pressure. The bulb is placed in the path of cooling fluid between the outlet of the condenser and the inlet of the pressure-reducing device.