Last week, we described the criteria that may affect absorption distance. This week we look at how your choice of humidifier dispersion assembles may affect that absorption distance. Call your R.L. Deppmann sales representative to assist you in selection of the best dispersion method for your application.
Humidifier Placement In Airstream is Critical
Absorption or non-wetting distance is the dimension downstream from the leaving side of the steam dispersion assembly to the point where wetting will not occur, although wisps of steam may be present. Solid objects at duct air temperature, such as coils, dampers, fans, etc., downstream of this dimension will remain dry. Location A is the best choice. [Read more…]
Factors That Affect Absorption – Humidification Part II
Duct or AHU temperature. Cool air absorbs less than warm air and requires a longer absorption distance. When equal amounts of steam are introduced into equivalent ducts but with different air temperatures, the lower temperature systems of 50 °F to 55 °F are more difficult to ensure absorption than systems with higher temperatures.
How to Design for Proper Steam Humidification Steam Absorption
Humidification of buildings helps provide a healthy and comfortable work environment. The next several R.L. Deppmann Monday Morning Minutes will examine steam absorption humidification and provide solutions to some of the common issues we see on a regular basis. Dri-Steem Corporation provides a variety of products to solve the many needs in this area of the HVAC
FAQs on Expansion and Compression Tanks – Part 2 of Series
Here we answer the questions:
Can I use a bladder tank and a steel compression tank in the same system? Adding on to my system, need to increase my compression tank/expansion tank capacity? How do I put another tank in parallel with the existing? Or my existing tank is too small, how do I increase capacity? What happens if the bladder type tank air charge is not increased to the proper fill pressure?
FAQs on Expansion and Compression Tanks – Part 1 of Series
Here we answer the questions:
How do I select a B&G bladder tank to replace my plain steel compression tank? What tank do I need for my XXX BTUH Boiler? Can I install the bladder / diaphragm tank on its side? How come the factory can’t charge my tank to something other than 12 PSIG? Why is my compression tank water logged? When I soap it, I can’t find a leak.
Compression Tank and Expansion Tank Selection Examples – Part 10
Today, let’s look at a couple of selections and how the tank sizes and costs may vary based on location and type of tank selected. Our examples are shown in figures A & B. In each case we will use a system volume of 1500 gallons of water with a supply temperature of 200°F and 20°F ΔT. The system is 60 feet high and in each case the maximum pressure is 50 PSIG.
Differences in Compression Tank and Expansion Tank Formula – Part 9
Now we understand the difference between expansion and compression tanks as described in the R. L. Deppmann Monday Morning Minutes of 1-9-12 and 1-16-12. What happens to the formula results when comparing these two types of tanks? In part 1 of this series, we introduced the formula for tank sizing. The denominator of the equation was: (Pa /Pf) – (Pa /Po)
Expansion and Compression Tanks – Which Tank? – Part 8
Choosing to use a Bell and Gossett ASME bladder style expansion tank, ASME diaphragm style tank, or ASME standard compression tank in your hydronic system will depend on several factors. One important consideration in choosing which tank to use depends on the type of “air control” system you design. Air elimination systems depend on automatic air vents to continually remove the air from the hydronic system.
Types of Tanks – Expansion and Compression Tanks – Part 7
What is the difference and when should I use them? Let’s start with ASME. In commercial and institutional applications, ASHRAE, as well as most codes require the pressure vessels carry an ASME U stamp. This assures the owner and the owner’s insurance carrier that the vessel was inspected by an independent appraiser and registered with the National Board.