Air conditioning and ventilating system that enhance ventilation in response to a refrigerant leakage

An air conditioning and ventilating system comprising:

• an air conditioning device including a heat exchanger configured to generate conditioned air by heat exchange with a refrigerant, and configured to send the conditioned air to an air conditioned space;
• a ventilator configured to ventilate the air conditioned space by exhausting air from the air conditioned space;
• a refrigerant sensor configured to detect concentration of the refrigerant in the air conditioned space;
• and
• a controller configured to control operations of the air conditioning device and the ventilator, and prevent a shortage of a ventilation volume of air in the air conditioned space in a presence of an unevenness of the refrigerant concentration in an entire space of the air conditioned space,
• wherein on determination that the refrigerant concentration acquired from the refrigerant sensor exceeds a first predetermined value, the controller sets an operation of a compressor of the air conditioning device to a stop state and sets the ventilator to an operating state,
• on determination that the refrigerant concentration that has exceeded the first predetermined value becomes equal to or less than the first predetermined value, the controller continues the stop state of the compressor of the air conditioning device and the operating state of the ventilator until predetermined timing to prevent the shortage of the ventilation volume of air in the air conditioned space,
• the predetermined timing is a time when a predetermined time elapses after the refrigerant concentration that has exceeded the first predetermined value becomes equal to or less than the first predetermined value, the predetermined time is calculated based on at least one of volume of the air conditioned space, ventilation capacity of the ventilator, refrigerant volume expected to leak to the air conditioned space, and refrigerant leakage velocity,
• the predetermined time is a time calculated by dividing a total refrigerant volume of the air conditioning device by a predicted leakage velocity, and
• the predicted leakage velocity is calculated by multiplication by the ventilation capacity of the ventilator by a refrigerant concentration when the refrigerant concentration is fully saturated.

An air conditioning and ventilating system comprising:

• an air conditioning device including a heat exchanger configured to generate conditioned air by heat exchange with a refrigerant, and configured to send the conditioned air to an air conditioned space;
• a ventilator configured to ventilate the air conditioned space by exhausting air from the air conditioned space;
• a refrigerant sensor configured to detect concentration of the refrigerant in the air conditioned space;
• and
• a controller configured to control operations of the air conditioning device and the ventilator, and prevent a shortage of a ventilation volume of air in the air conditioned space in a presence of an unevenness of the refrigerant concentration in an entire space of the air conditioned space,
• wherein on determination that the refrigerant concentration acquired from the refrigerant sensor exceeds a first predetermined value, the controller sets an operation of a compressor of the air conditioning device to a stop state and sets the ventilator to an operating state,
• on determination that the refrigerant concentration that has exceeded the first predetermined value becomes equal to or less than the first predetermined value, the controller continues the stop state of the compressor of the air conditioning device and the operating state of the ventilator until predetermined timing to prevent the shortage of the ventilation volume of air in the air conditioned space,
• the predetermined timing is a time when a predetermined time elapses after the refrigerant concentration that has exceeded the first predetermined value becomes equal to or less than the first predetermined value, the predetermined time is calculated based on at least one of volume of the air conditioned space, ventilation capacity of the ventilator, refrigerant volume expected to leak to the air conditioned space, and refrigerant leakage velocity, and
• the predetermined time is a time calculated by dividing a total refrigerant volume of the air conditioning device by an actual refrigerant leakage velocity.