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Flow Smart® (Power Saving System of Refrigeration Pump)
Received the Chairman Prize from The Japan Machinery Federation for gAwards Plan for Energy-saving Equipment Excellenceh in the fiscal 2000.
Click here for the home page of The Japan Machinery Federation.
The Flow Smart® is an energy saving system, which makes it possible to save the power consumption of pumps used for the chilled/hot water as heat sources and the cooling water for refrigeration machines approximately by 60%, thus enabling application to new construction and reconstruction works.
System Outline
Normally, the refrigeration machine pump (i.e., primary pump) is operated in a variable flow rate.

In other words, even though there were some cases, such as between seasons or in the nighttime, where the secondary-side load (water volume demanded on the air conditioner side) becomes smaller, the refrigeration machine kept feeding a constant volume of chilled water. The year-round load factor (See Note: 1) of average refrigeration machines is 30 to 40%, which, however, varies with intended uses, sizes, heat source systems, and others of air conditioners.

The Flow Smart® monitors the bypass pipefs flow rate and further controls the primary-side pumpfs flow rate via an inverter (See Note: 2) so that the bypass pipefs flow rate reaches zero (0), for the reduction of the flow. Thus, the primary-side pump is able to feed water of a volume corresponding to the secondary-side loads.

Furthermore, the cooling water pump is controlled in proportion to the chilled water control output, enabling a substantial reduction in transfer power.
In addition, the Flow Smart® is applicable to the primary-side pump system (See Note: 3).

1. Percentage of actual operating hours to the rated capacity of refrigeration machine
2. Pump flow-rate control via inverter consumes power in proportion to the cube of the flow rate, thus accomplishing a substantial reduction in power consumption. (Example: The average flow is 80%. Power consumption = Rated power x (0.8)^3 à Rated power x 0.5)
3. Feed water system, which has no secondary-side feed water pump between the reciprocating header and air conditioner.

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