US 11,885,517 B2
Air conditioning and ventilating system that enhance ventilation in response to a refrigerant leakage
Kousuke Hirai, Osaka (JP); Akiyoshi Yamamoto, Osaka (JP); Gakuto Sakai, Osaka (JP); Yoshitaka Matsugi, Osaka (JP); and Tooru Fujimoto, Osaka (JP)
Assigned to DAIKIN INDUSTRIES, LTD., Osaka (JP)
Filed by DAIKIN INDUSTRIES, LTD., Osaka (JP)
Filed on Mar. 7, 2022, as Appl. No. 17/688,186.
Application 17/688,186 is a continuation of application No. PCT/JP2020/033174, filed on Sep. 2, 2020.
Claims priority of application No. 2019-178824 (JP), filed on Sep. 30, 2019.
Prior Publication US 2022/0186960 A1, Jun. 16, 2022
Int. Cl. F24F 11/36 (2018.01); F24F 11/49 (2018.01); F24F 7/007 (2006.01); F25B 49/02 (2006.01)
CPC F24F 11/36 (2018.01) [F24F 7/007 (2013.01); F24F 11/49 (2018.01); F25B 49/022 (2013.01); F25B 2313/0293 (2013.01); F25B 2500/222 (2013.01)] 8 Claims
OG exemplary drawing
 
1. 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 timing is a time calculated by dividing a total refrigerant volume of the air conditioning device by a minimum refrigerant outflow velocity, and
the minimum refrigerant outflow velocity is calculated by multiplication by the first predetermined value, the volume of the air conditioned space, and a number of natural ventilations of the air conditioned space.