US 12,460,847 B2
On-demand air bleeding method for refrigeration systems, and system for implementing said method
Luciano Lombardi Crisostomo, São Paulo (BR)
Assigned to HANTECH BRASIL COMERCIAL IMPORTADORA E EXPORTADORA LTDA, Itaquaquecetuba (BR)
Appl. No. 18/572,356
Filed by HANTECH BRASIL COMERCIAL IMPORTADORA E EXPORTADORA LTDA, Itaquaquecetuba (BR)
PCT Filed Aug. 25, 2021, PCT No. PCT/BR2021/050362
§ 371(c)(1), (2) Date Dec. 20, 2023,
PCT Pub. No. WO2023/272365, PCT Pub. Date Jan. 5, 2023.
Claims priority of application No. 102021013199-3 (BR), filed on Jul. 2, 2021.
Prior Publication US 2024/0288207 A1, Aug. 29, 2024
Int. Cl. F25B 43/04 (2006.01); F25B 41/20 (2021.01)
CPC F25B 43/043 (2013.01) [F25B 41/20 (2021.01); F25B 2600/2519 (2013.01); F25B 2700/04 (2013.01)] 13 Claims
OG exemplary drawing
 
1. An air bleeding method for refrigeration systems, comprising:
receiving condensed fluid coming from a refrigeration system;
conducting the condensed fluid through a heat exchanger to cool it;
returning the condensed fluid from the heat exchanger to the refrigeration system;
collecting a mixture of non-condensable gases and refrigerant fluid in a gaseous state, coming from a chosen bleed point of the refrigeration system, through an opening of a first plant valve at a first point and leading the mixture to the cooled heat exchanger;
condensing the mixture in the heat exchanger, until the refrigerant fluid remains in a fluid state at high pressure;
conduction of the mixture of fluid refrigerant fluid and non-condensable gases at high pressure coming from the plant to a high pressure tank;
monitoring a fluid level in the high pressure tank and a pressure in the high pressure tank;
conduction of non-condensable gases withdrawn from the high-pressure tank to a bubbler by pressure difference through an opening of an air valve;
conduction of bubbles and droplets of condensed refrigerant fluid from the high pressure tank to the refrigeration system by gravity, through an opening of a feedback valve; and
expelling non-condensable gases in the bubbler;
wherein:
a plant valve remains open until all non-condensable gases are withdrawn from that bleed point, and when there is no more air to be bled, the system starts to receive fluid refrigerant fluid, which is conducted to the high-pressure tank, increasing the tank level;
when the pressure in the high pressure tank reaches a threshold value, an air valve is actuated and the non-condensable gases are expelled from the high pressure tank to the bubbler; and
when the fluid level reaches a threshold, the first plant valve closes and a second plant valve opens, collecting air from a new point in the system and the air valve is closed and a feedback valve is actuated so that the fluid from the high pressure tank is returned to the system until the fluid level in the high pressure tank returns to an initial value.