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Over the last few weeks we've looked at pumping issues with parallel equal sized condensers and pumps. This week we will look at the parallel condenser systems where the condensers are different types or sizes.
Read MoreIn Part 1 of this series we offered an example of a condenser water pumping system with 800 GPM per condenser for a total of 1600 GPM with the third condenser serving as standby. The tower elevation or lift is 10 feet, the condenser (with the 2-way valve and balance valve) has 20 feet of pressure drop, and the common piping with any safety factor has 30 feet of pressure drop. But there was a problem....
Read MoreApplying a single constant speed pump for each condenser in a chilled water application is a normal design for the HVAC engineer. Some chiller manufacturers suggest piping the pumps with a common header and activating each pump as the condensers are staged on. However, there is a hidden issue with this approach, which, if not addressed may cause major problems....
Read MoreWe recently introduced the part load efficiency value (PLEV) aspect of the Bell & Gossett online pump selection tool. PLEV for pumps is based on flow rate while the Integrated Part Load Value (IPLV) for chillers is based on load. This final segment on PLEV will look at the difference.
Let’s begin by examining....
Read MoreWhen looking at Bell & Gossett pump selections we often find higher part load efficiency (PLEV) pump choices are to the right of BEP or best efficiency point. How close to end of curve should a prudent engineer choose?
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