---
title: Webinar Replay
---

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# Webinar replay

 

# A Comparison Between Variable Primary Flow and Primary/Secondary Chilled Water Pumping Systems

 

**What You Will Learn**

The webinar will explain the relative merits of two different approaches to flow modulation in different types of chilled water pumping systems: variable primary and primary/secondary. It will look at the upsides and the downsides of each including the chiller sequencing, control of flow and return temperatures, pump control methods, by-pass control and any potential threats and vulnerabilities.

**Key topics:**

- Pump types: Constant primary, variable secondary; variable primary flow
- Comparison between each pump type: Space, first cost, running cost, effectiveness

**Key questions answered:**

1. What are primary only systems most appropriate for?
2. What are the design parameters of the decoupler line on primary/secondary systems and why it needs a minimum pressure drop?
3. Where should the water flow sensor be installed to detect minimum flow to the chiller?
4. How do modular chillers impact pump configurations?

**Product Solutions of Interest:**

[Active Performance Management](https://armstrongfluidtechnology.com/en/active-performance-management)

[Design Envelope Technology](https://armstrongfluidtechnology.com/en/products-and-services/design-envelope-solutions-and-products-category/design-envelope-solutions-and-products)

[Heating and Cooling](https://armstrongfluidtechnology.com/en/products-and-services/heating-and-cooling)

[Plumbing and Water Supply](https://armstrongfluidtechnology.com/en/products-and-services/plumbing-and-water-supply)

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[Hutton Hall – A Government Facility Installation](https://armstrongfluidtechnology.com/~/media/documents/case-studies/9-528uk_lancashireconstabulary_casestudy.pdf?display=1)

[Calsonic Kansei North America – An Industrial Facility Installation](https://armstrongfluidtechnology.com/~/media/documents/case-studies/9-554_ckna_case_study.pdf?display=1)

[Humber College – An Educational Facility Installation](https://armstrongfluidtechnology.com/~/media/documents/case-studies/9-509_humbercollege.pdf?display=1)

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[The Untapped Opportunity in Constant Flow Systems – Up to 20% Energy Savings](https://info.armstrongfluidtechnology.com/lp-replay-the-untapped-opportunity-in-constant-flow-systems-energy-savings?hsLang=fr-ca)

For more information, [contact us](https://armstrongfluidtechnology.com/en/help-and-support/email-us) to speak with one of our experts.

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