Glanded Pumps - THERMO-ECO-ENGINEERING úvod

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Switching and Control Devices Wilo-VR, CRn, and CR control devices Control modes Differential pressure – temperature-superimposed (p-T) Differential pressure setpoint p[m] Fig.: Differential-pressure setpoint variation as a function of temperature Differential temperature control (T) Temperature T[C] max. min. 90 70 25 20 + 50 - 20 Temperature T[C] Feed temperature Return temperature Q [%] Fig.: Flow volume-rate variation as a function of temperature spread The operational performance of the hydraulic system can be further optimised by adapting the differential-pressure setpoint value for pump performance control as a function of a superimposed reference variable (e.g. outdoor temperature). The setpoint differential-pressure value and thus the pump performance is reduced with rising outside temperatures, it will increase with falling outside temperatures. >Required accessory: - DDG differential-pressure sensor - KTY 10 temperature board or - PT 100 temperature board - Process temperature sensors and outdoor temperature sensors PT 100 or KTY Heating / air-conditioning systems vary in terms of their cooling / heating requirements with expectable outside temperature fluctuations. A number of installations are based on constant volume circulation without fittings to regulate the flow volume (one-pipe systems, primary circuits, etc.). Moreover, pure throttling or bypass controls are highly uneconomical. Added to this comes the unnecessarily high power consumption (current) to drive the pump during low load periods. Differential-temperature control T is one option of maintaining a constant difference between feed and return temperatures as a result of weather- and usage-related temperature spread. The heat flow becomes variable due to the changes in flow rates and the transferred heating / cooling capacity can be controlled independently of feed or return temperatures. Differential-temperature control should for reasons of comprehensibility only be used with individual consumers or with systems with a known control-time constant. >Required accessory: - KTY 10 temperature board or - PT 100 temperature board - Temperature sensor TSG or PT 100 (onsite) 178 Subject to change without prior notice 09/2006 WILO AG 100 T
Switching and Control Devices Wilo-VR, CRn, and CR control devices Control modes Temperature control (±T) Return temperature –T [C] H [%] Delivery head Power consumption P 1 [%] Control range, adjustable from 5°C to 50°C, e.g. 30°C Max. boundary min. n = 60 % min. n = 60 % Fig.: System diagram of stepless temperature control Wilo Catalogue A2 - <strong>Glanded</strong> pumps Outside temperature TA [C] max. n = 100 % Control range Heating curves, basic temperature Flow volume Q [%] max. n = 100 % Energy savings Flow volume Q [%] Min. boundary Feed temperature + T [C] Pump performance diagram Q/H Pump performance diagram Q/P In the case of pump control as a function of temperature, the control signal (±T) brings about a variation of pump performance, but there is no adaptation by way of feedback and setpoint / actual value comparison of the variation or its results. Fixed motor speeds have been allotted to the pump for certain feed / return temperatures in accordance with an empirically predetermined pump curve. A decreasing feed temperature (+T) or a rising return temperature (-T) will result in a speed reduction and thus in decreasing pump performance input. Temperature control ±T can only be applied to single pump operation. Feed or return temperature-sensitive peak-load operation is technically not feasible. >Required accessory: - KTY 10 temperature board or - PT 100 temperature board - Temperature sensor TSG or PT 100 (onsite) 179 Planning Guide Energy-saving pumps Standard pumps Special In-line <strong>Pumps</strong> Switching and Control Devices Pump Management Systems
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Catalogue Heating, Air-Conditioning
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Contents Wilo Catalogue A2 - Glande
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General Notes and Abbreviations Not
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Planning Guide Maintained pressure
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Planning Guide Mechanical seal A me
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Planning Guide This can take the fo
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Planning Guide Principle of operati
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Energy-Saving Pumps Contents Energy
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Energy-Saving Pumps Single-head pum
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Energy-Saving Pumps Twin-head pumps
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Energy-saving pumps Single-head pum
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Energy-saving pumps Twin-head pumps
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Standard Pumps Single-head pumps In
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Standard Pumps Double pumps In-line
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Standard Pumps In-line pumps Techni
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Standard Pumps Single-head pumps (H
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Page 193 and 194: Terminal Diagrams Wilo-CRn, Wilo-CR
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Glanded Pumps - THERMO-ECO-ENGINEERING úvod

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