Abstract: A cooling system has a cabinet and a plurality of separate cooling stages including an upstream cooling stage and a downstream cooling stage. At least the upstream cooling state is a variable capacity cooling stage. Each cooling stage has a cooling circuit. Evaporators of the cooling circuits are arranged in the cabinet so that air passes over them in serial fashion. A controller when a Call for Cooling first reaches a point where cooling is needed, operating the upstream cooling circuit to provide cooling and not the downstream cooling circuit. When the Call for Cooling has increased to a second point, the controller additionally operates the downstream cooling circuit to provide cooling. The cooling capacity at which the upstream cooling circuit is being operated is less than its full capacity when the Call for Cooling reaches the second point.

Abstract: A conditioning system of the free cooling type for environments and particularly for computing centers, which comprises: a conditioning unit of the free cooling type, which in turn comprises an air/air heat exchanger, inside which two air flows exchange heat, a primary air flow, from and toward an environment to be air-conditioned, and a secondary air flow, or process flow, drawn from outside, and evaporative cooling elements using water, first fans for moving the primary air flow, second fans for moving the secondary air flow, detectors for detecting temperature and humidity for the primary air flow and the secondary air flow at the inlet and at the outlet of the conditioning unit, detectors for detecting the flow-rate of the primary air flow and of the secondary air flow, an electronic control and management unit adapted to collect and process the data detected by the detectors and adapted to determine, on the basis of the outside humidity and temperature values and of the demand for cooling, the operati

Abstract: A cooling system has a cabinet and a plurality of separate cooling stages including an upstream cooling stage and a downstream cooling stage. At least the upstream cooling state is a variable capacity cooling stage. Each cooling stage has a cooling circuit. Evaporators of the cooling circuits are arranged in the cabinet so that air passes over them in serial fashion. A controller when a Call for Cooling first reaches a point where cooling is needed, operating the upstream cooling circuit to provide cooling and not the downstream cooling circuit. When the Call for Cooling has increased to a second point, the controller additionally operates the downstream cooling circuit to provide cooling. The cooling capacity at which the upstream cooling circuit is being operated is less than its full capacity when the Call for Cooling reaches the second point.

Abstract: A cooling system has a cabinet and a plurality of separate cooling stages including an upstream cooling stage and a downstream cooling stage. At least the upstream cooling state is a variable capacity cooling stage. Each cooling stage has a cooling circuit. Evaporators of the cooling circuits are arranged in the cabinet so that air passes over them in serial fashion. A controller when a Call for Cooling first reaches a point where cooling is needed, operating the upstream cooling circuit to provide cooling and not the downstream cooling circuit. When the Call for Cooling has increased to a second point, the controller additionally operates the downstream cooling circuit to provide cooling. The cooling capacity at which the upstream cooling circuit is being operated is less than its full capacity when the Call for Cooling reaches the second point.

Abstract: A cooling system has a tandem compressor, a condenser, an electronic expansion valve and an evaporator arranged in a direct expansion cooling circuit. The tandem compressor includes a variable capacity compressor and a fixed capacity compressor. A controller controls the electronic expansion valve and selects which of a plurality of superheat control modes to use in operating the electronic expansion valve based on control parameters and a current operating status of each of the variable capacity compressor and fixed capacity compressor of the tandem compressor.

Abstract: A cooling system has a cabinet and a plurality of separate cooling stages including an upstream cooling stage and a downstream cooling stage. At least the upstream cooling state is a variable capacity cooling stage. Each cooling stage has a cooling circuit. Evaporators of the cooling circuits are arranged in the cabinet so that air passes over them in serial fashion. A controller when a Call for Cooling first reaches a point where cooling is needed, operating the upstream cooling circuit to provide cooling and not the downstream cooling circuit. When the Call for Cooling has increased to a second point, the controller additionally operates the downstream cooling circuit to provide cooling. The cooling capacity at which the upstream cooling circuit is being operated is less than its full capacity when the Call for Cooling reaches the second point.

Abstract: A cooling system has a tandem compressor, a condenser, an electronic expansion valve and an evaporator arranged in a direct expansion cooling circuit. The tandem compressor includes a variable capacity compressor and a fixed capacity compressor. A controller controls the electronic expansion valve and selects which of a plurality of superheat control modes to use in operating the electronic expansion valve based on control parameters and a current operating status of each of the variable capacity compressor and fixed capacity compressor of the tandem compressor.

Abstract: A static switch for DC motors of climate control units, comprising a signal side and a power side, which are mutually separated by means of optoisolators, the side comprising in input at least one terminal for a motor on/off signal and a terminal for a pulse width modulation signal PWM to provide the amplitude modulation, on the power side, of a motor speed signal, the switch comprising a precharging device which has a control terminal connected to a power-on optoisolator and a precharging current supply terminal connected to a motor power supply pole, the switch further comprising at least one power-on transistor connected to the same motor supply pole of the power supply terminal of the device, so that a voltage applied across the power-on transistor that exceeds a certain threshold switches off the motor power-on transistor.

Abstract: A static switch for DC motors of climate control units, comprising a signal side and a power side, which are mutually separated by means of optoisolators, the side comprising in input at least one terminal for a motor on/off signal and a terminal for a pulse width modulation signal PWM to provide the amplitude modulation, on the power side, of a motor speed signal, the switch comprising a precharging device which has a control terminal connected to a power-on optoisolator and a precharging current supply terminal connected to a motor power supply pole, the switch further comprising at least one power-on transistor connected to the same motor supply pole of the power supply terminal of the device, so that a voltage applied across the power-on transistor that exceeds a certain threshold switches off the motor power-on transistor.