Refrigerating fluid circuit comprising an accumulator bypass branch

A method for controlling a refrigerant fluid circuit for a heat treatment system, the refrigerant fluid circuit including a main branch starting at a first convergence point and terminating at a first divergence point and including at least one accumulator, a compression device and a first heat exchanger, the refrigerant fluid circuit including a first branch and a second branch, both starting at the first divergence point and terminating at the first convergence point, the first branch including a second heat exchanger, the second branch including a third heat exchanger, wherein the refrigerant fluid circuit includes a bypass branch which starts at a second divergence point situated on the second branch, downstream of the third heat exchanger, and which terminates at a second convergence point situated on the main branch, downstream of the at least one accumulator and upstream of the compression device, the refrigerant fluid circuit further including a control member configured to manage a circulation of the refrigerant fluid from the second branch to the at least one accumulator or to the bypass branch, the method comprising:

• in a mode for cooling a passenger compartment of the vehicle, adjusting the control member such that all of the refrigerant fluid circulates in the bypass branch,
• in a mode for heating the passenger compartment of the vehicle, adjusting the control member in order to determine a proportion of refrigerant fluid circulating to the at least one accumulator and circulating in the bypass branch.

A method for controlling a refrigerant fluid circuit for a heat treatment system, the refrigerant fluid circuit including a main branch starting at a first convergence point and terminating at a first divergence point and including at least one accumulator, a compression device and a first heat exchanger, the refrigerant fluid circuit including a first branch and a second branch, both starting at the first divergence point and terminating at the first convergence point, the first branch including a second heat exchanger, the second branch including a third heat exchanger, wherein the refrigerant fluid circuit includes a bypass branch which starts at a second divergence point situated on the second branch, downstream of the third heat exchanger, and which terminates at a second convergence point situated on the main branch, downstream of the at least one accumulator and upstream of the compression device, the refrigerant fluid circuit further including a control member configured to manage a circulation of the refrigerant fluid from the second branch to the at least one accumulator or to the bypass branch, the method comprising:

• in a mode for cooling a passenger compartment of the vehicle, adjusting the control member such that all of the refrigerant fluid circulates in the bypass branch,
• in a mode for heating the passenger compartment of the vehicle, adjusting the control member in order to determine a proportion of refrigerant fluid circulating to the at least one accumulator or circulating in the bypass branch.