Regulation method and regulation apparatus of a refrigeration plant and respective refrigeration plant including such apparatus

A regulation apparatus for a refrigeration plant, wherein a refrigerating fluid path is defined in the refrigeration plant and one or more devices are arranged along said refrigerating fluid path, wherein said regulation apparatus includes

• a first sensor arranged in a first point (P1) along the refrigerating fluid path of the refrigeration plant to detect a first value of a quantity in said first point (P1),
• a second sensor arranged in a second point (P3) along the fluid path of the refrigeration plant to detect a second value of said quantity in said second point (P3), or a calculation unit to calculate and derive the second value, of said quantity in said second point (P3),
• a control unit and
• an actuation device to actuate at least one or more devices of the refrigeration plant,
• wherein in said control unit a reference value or set point is stored for the quantity measured by the first sensor, and a reference value or set point is stored for the quantity measured by the second sensor or calculated by said calculation unit for said second point (P3), and a first neutral zone around the first reference value and a second neutral zone around the second reference value are stored,
• wherein a constant regulation is provided in said first neutral zone and second neutral zone and a regulation request is stopped or is blocked at a value such as to satisfy specific operating conditions in the refrigeration plant, and wherein in said control unit a zone of reduction or decrease of the regulation and a zone of growth or increase of the
• regulation is set, said control unit controlling a first real value measured by said first sensor and check if said first measured value is inside the first neutral zone, of a growth zone or in a zone of reduction or decrease for said first sensor, and calculate a first regulation request (Req_p1) of operating parameters of said one or more devices of the refrigeration plant,
• said contra unit controlling a value measured by said second sensor, or a value calculated by said calculation unit for said second point (P3), and check whether said value measured by the second sensor, or calculated for said second point (P3) is located within the respective neutral zone, growth zone or zone of reduction or decrease for said second sensor or for said second point (P3), and derive a second regulation request (Req_p3) of operating parameters of said one or more devices of the refrigeration plant,
• and wherein said control unit compares the first regulation request (Req_p1) on said first sensor with the second regulation request (Req_p3) on said second sensor or for said second point, establish which regulation request is more effective and/or more suitable for said refrigeration plant between the first regulation request and the second regulation, and wherein said control unit controls the actuation device to actuate said more effective and/or more suitable regulation request for said refrigeration plant.