DUCTABLE AIR-COOLED LIQUID CHILLERS 30RBSY 039-160
Air pressure drop
Selection of a ductable unit
The 30RBSY ranges are designed for indoor installation in a plant room. For this type of installation the cold or hot air leaving the air-cooled air heat exchangers is discharged by the fans to the outside of the building, using a duct system. The units are equipped with fans with available pressure, designed to operate with air discharge ducts with maximum pressure drops of 180 Pa or 240 Pa on certain sizes. To compensate for these pressure drops this range of ductable units equipped with variable-speed fans with a maximum speed of 19 r/s. In the cooling mode, the full-load or part-load speed is controlled by a patented algorithm that permanently optimises the condensing temperature to ensure the best unit energy efﬁciency (EER) whatever the operating conditions and pressure drops of the system ductwork. In the heating mode, the full-load or part-load speed of each circuit is ﬁxed and at the conﬁgured maximum (range conﬁgurable from 12 r/s to 19 r/s) based on the constraints and characteristics of the installation site. The maximum conﬁgured speed applies to both the heating and cooling mode. Each refrigerant circuit (A and B) must have a separate ducting system to prevent any air recycling between the air heat exchangers of the different refrigerant circuits.
Selection based on the pressure drop
The cooling and heating capacities are given for an available pressure of 160 Pa and for a unit without ﬁlter. To calculate the performances at other pressure drops please use the correction factors below.
30RBSY 039-060/30RBSY 090-120 Duct pressure drop 0 50 100 130 160 200 240 Fan speed, r/s 12.00 13.33 14.66 15.46 16.26 17.31 18.36 Power input coefﬁcient 0.943 0.962 0.980 0.990 1.000 1.012 1.023 Cooling capacity coefﬁcient 1.019 1.012 1.006 1.003 1.000 0.998 0.996
30RBSY 070-080/30RBSY 140-160 Duct pressure drop 0 50 100 130 160 180 Fan speed, r/s 15.83 16.81 17.78 18.36 18.36 18.36 Power input coefﬁcient 0.929 0.944 0.964 0.978 1.000 1.019 Cooling capacity coefﬁcient
1.018 1.016 1.014 1.011 1.000 0.991