What’s lurking in your traditional open cooling tower basin? There is increasing concern about the sediment build-up, algae growth, and bacteria growth in open cooling …
Variable Speed Chilled Water Systems: Demand Reset
There are multiple methods to vary pump speed in HVAC chilled water systems. A common method is the use of a differential pressure transmitter at …
Cooling Tower Spring Startup Tips
The weather is warming, and our attention turns away from heating and toward system air conditioning. To protect the cooling tower pumps, we offer a …
Tis’ the Season to Start Your Air-Cooled Chillers
Many air-cooled chillers do not have glycol and are drained for the winter season. Most cooling towers are also drained for our cold winter months. …
Tired of Water Quality Issues with Cooling Tower Basins?
What’s lurking in your traditional open cooling tower basin? Today, there is a growing concern about the sediment build-up, algae growth, and bacteria growth in …
Primary – Secondary Sediment Separator Piping in Variable Flow Cooling Tower/Condenser Water Systems
The last R. L. Deppmann Monday Morning Minutes offered suggestions for the use of a Griswold sediment separator in a variable flow tower system. The …
Domestic Water Heaters: Plate Heat Exchangers and Dual Return Condensing Boilers
Gas-fired storage type domestic water heaters are the norm in commercial and institutional buildings. Walk into any mechanical room of a larger complex and you …
Hydronic Primary/Secondary Heating-Cooling (Chiller) Changeover Systems
Once in a while, we still see the two pipe heating or cooling system with a manual or automatic changeover process that the owner uses …
Sizing Pressure Relief Valves for Closed Chilled Water Systems
Pressure relief valve sizing for heating systems is well documented by ASHRAE, boiler codes, and product manufacturers such as Bell & Gossett. Relief valve sizing …
Parallel Pumping in Condenser Applications (Part 1)
Applying a single constant-speed pump for each condenser in a chilled water application is a normal design for the HVAC engineer. The chiller manufacturers suggest …