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Building Services Engineering l May/June 2022
Oriented towards savings in energy
Pump pressure groups made simple Whether it is commercial applications, industrial buildings or housing, pressurisation groups are ideal for increasing water system reliability, or where greater system power is required, to guarantee maximum comfort in terms of quantity and water pressure. Calpeda has always been to the forefront with innovative solutions to tackle this challenge and its new Mèta e-idos 2-pump variable speed pressure booster system with integrated control is a huge advancement.
“Some factors are critically important when choosing a pressurisation group,” says Andrew Bishop, Technical Sales Manager, Calpeda Pumps (Ireland), “and key among them are energy saving, design simplicity and system cost containment. When designing a pressurisation group with several pumps in parallel, a control panel to which all the pumps are connected is usually necessary. It is the control panel which, when it identifies a pressure variation, activates the pumps according to how it was programmed. Our new 2-pump booster sets are future-proofed in this respect as all E-idos pumps are already equipped with a pressure sensor. “A further bonus is that the pumps used in the battery only need to be hydraulically connected to create an immediate situation of redundancy … when the pumps are connected at the same pressure threshold, one starts when another one stops. The simple hydraulic connection also helps keep the system pressure constant.” Redundancy or connected thresholds are not the only methods for making the best use of pairing several e-idos pumps. Without using wiring and various types of group manager, two systems have been perfected that
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make it possible to insert the concept of cyclicity into group operation. When speaking of cyclicity in the case of pressurisation groups, reference is made to the same average operation time of all the pumps over a given period, so that wear is distributed evenly. In the case of the e-idos groups, cyclicity can be managed easily by selecting one of the pre-programmed methods – synchronisation or random – from the programming menu. In both cases just set the same start and stop thresholds, in other words those of the general system, for all the pumps. In the event of power failures or if the supply is stopped simply for maintenance, the cyclicity conditions reset automatically. If,
instead, the random mode is selected, the starting and stopping of each pump is delayed by an interval that is calculated randomly by the algorithm, with the number of interventions of each pump being distributed in a statistical manner. The electronics built into the pumps are strategic, even when designing pressurisation groups. It is evident that no external control system means fewer costs and smaller spaces, in addition to notably simple programming and use. Also, every e-idos pump already has its own built-in check valve. “Finally, a consideration on energy saving,“ says Andrew. “Pressurisation groups, being designed specifically to handle partial loads, are naturally oriented towards savings in energy. In the case of e-idos groups, and especially the new 2-pump booster sets, this aspect is amplified by the notable energy efficiency that characterises each e-idos pump.” Contact: Andrew Bishop, Technical Sales Manager, Calpeda Pumps (Ireland). T: 01 – 861 2200; E: andrew @calpedaireland.com W: www.calpeda.com Q
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