Abstract: Method for cool drying gas, whereby the cool dryer is characterized by curves that show the setpoint for the evaporator temperature or evaporator pressure for a load as a function of the lowest gas temperature, whereby the method comprises the following steps:—the determination of a curve and Tset or pset as a function of the load that is required to cool the gas to LATset; the control of a supply of coolant from the compressor to an injection point (P) downstream from the expansion means and upstream from the compressor in order to make the evaporator temperature or evaporator pressure equal to Tset or pset.

Abstract: A method for cool drying gas by guiding gas through the secondary section of a heat exchanger whose primary section forms the evaporator of a closed cooling circuit in which a coolant can circulate by means of a compressor that is followed by a condenser and expansion means through which the coolant can circulate, whereby use is made of an air-cooled condenser with a frequency controlled fan, and the method comprises the step of controlling the speed of the aforementioned fan so that the condenser pressure is kept equal to a target value.

Abstract: A method for cool drying gas, making use of a heat exchanger whose primary section forms the evaporator of a cooling circuit with a compressor, an expansion valve and a bypass pipe across the compressor with a hot gas bypass valve, whereby the method makes use of a formula that makes the link between the state of the expansion valve and hot gas bypass valve, whereby on the basis of this formula: either the state of the expansion valve is adjusted as a function of the state of the hot gas bypass valve; or adjusting the state of the hot gas bypass valve as a function of the state of the expansion valve or vice versa; or the states of both valves are controlled with respect to one another.

Abstract: A method for cool drying gas by guiding gas through the secondary section of a heat exchanger whose primary section forms the evaporator of a closed cooling circuit in which a coolant can circulate by means of a compressor that is followed by a condenser and expansion means through which the coolant can circulate, whereby use is made of an air-cooled condenser with a frequency controlled fan, and the method comprises the step of controlling the speed of the aforementioned fan so that the condenser pressure is kept equal to a target value.

Abstract: A method for cool drying gas by guiding gas through the secondary section of a heat exchanger whose primary section forms the evaporator of a closed cooling circuit in which a coolant can circulate by means of a compressor that is followed by a condenser and expansion means through which the coolant can circulate, whereby use is made of an air-cooled condenser with a frequency controlled fan, and the method comprises the step of controlling the speed of the aforementioned fan so that the condenser pressure is kept equal to a target value.

Abstract: A method for cool drying gas, making use of a heat exchanger whose primary section forms the evaporator of a cooling circuit with a compressor, an expansion valve and a bypass pipe across the compressor with a hot gas bypass valve, whereby the method makes use of a formula that makes the link between the state of the expansion valve and hot gas bypass valve, whereby on the basis of this formula: either the state of the expansion valve is adjusted as a function of the state of the hot gas bypass valve; or adjusting the state of the hot gas bypass valve as a function of the state of the expansion valve or vice versa; or the states of both valves are controlled with respect to one another.

Abstract: A method for cool drying gas by guiding gas through the secondary section of a heat exchanger whose primary section forms the evaporator of a closed cooling circuit in which a coolant can circulate by means of a compressor that is followed by a condenser and expansion means through which the coolant can circulate, whereby use is made of an air-cooled condenser with a frequency controlled fan, and the method comprises the step of controlling the speed of the aforementioned fan so that the condenser pressure is kept equal to a target value.

Abstract: Method for cool drying gas, whereby the cool dryer is characterised by curves that show the setpoint for the evaporator temperature or evaporator pressure for a load as a function of the lowest gas temperature, whereby the method comprises the following steps:—the determination of a curve and Tset or pset as a function of the load that is required to cool the gas to LATset; the control of a supply of coolant from the compressor to an injection point (P) downstream from the expansion means and upstream from the compressor in order to make the evaporator temperature or evaporator pressure equal to Tset or pset.