Q. What is a typical face velocity for a pumped glycol system like Konvekta? A. Konvekta pumped glycol energy recovery coils work anywhere in the range from 50-1000 FPM face velocity. It’s typical for coils to be sized between 350 and 500 FPM. There is always a trade-off between face velocity ( air pressure drop… Read more »
Posts By: Jim Shiminski
Ask Rick: Lab Exhaust Fans | Vibration Isolation for Strobic Air Tri-Stack Fans
Q. We are recommending high plume dilution lab exhaust fans from Strobic Air for a project. What would you recommend for vibration isolation? A. Strobic Air recommends that the Tri-Stack Fan be mounted on a 1½” wide strip of ¼” neoprene pad. No further vibration isolation is required or recommended. Tri-Stack fans are balanced… Read more »
Ask Rick: Energy Recovery Wheel | Question on ANSI/ASHRAE Standard 62.1-2010
Q. It appears that the ANSI/ASHRAE Standard 62.1-2010 restricts the use of wheels for lab use. Is this the correct interpretation? A. As it stands ANSI/ASHRAE Standard 62.1-2010 is not clear on the question of Class 4 exhaust (which includes lab fume hood exhaust). The standard reads as follows: 5.16.3.3.2 Class 3 air shall… Read more »
Project Snapshot: Field Erected Heat Pipe System
Project Name: East Boston Stadium HVAC Improvements Engineer: Engineered Systems, Inc. Contractor: P.J. Kennedy and Sons Equipment: Passive Heat Pipe Energy Recovery Module Manufacturer: Heat Pipe Technology DAC Sales Engineer: David Goodman Project Highlights: Existing Conditions: Football is a proud tradition in East Boston and funding was raised to replace original and antiquated HVAC equipment… Read more »
Heat Pipe for HVAC Systems | Heat Pipe Theory
Heat Pipe for HVAC Systems | Heat Pipe Theory This is a quick overview of how a Heat Pipe works in an HVAC system. More specific information can be found in free webinars from Heat Pipe Technology. Further questions on Heat Pipes feel free to askRick? See related Heat Pipe Blog Posts:Energy Recovery Heat Pipes… Read more »
Custom Air Handling Unit Design | Desaturation Cooling Coil
1. What is a Desaturation Cooling Coil? A Desaturation Cooling Coil (Desat Coil) really functions like two separate coils. It combines the aspects of a cooling coil and a reheat coil to cool, dehumidify and reheat the air. The Desat Coil includes an additional coil row in the leaving air side of the coil, called… Read more »
Ask Rick: Glycol Run Around Loops | Why do we not use Ethylene Glycol in the USA?
Q. Why do we not use Ethylene Glycol in the USA? A. Great Question. We use pumped glycol energy recovery systems all the time here in the United States. Up until recently we have almost exclusively used Propylene Glycol. Ethylene Glycol had not even been a choice. The biggest reason for this is that Ethylene… Read more »
Field Erected Air Handling Units | 4 Good Reasons to Assemble an Air Handling Unit On-Site
In 20 years of business we have been involved in supplying nearly 100 Field Erected Air Handling Units. They come in all shapes and sizes and are used in lots of different applications. Here are the top 4 reasons why field erected units make sense: They Fit – It’s very typical that worn out air… Read more »
Ask Rick: Pumped Glycol Systems | Does Air in the Glycol impact performance?
Q. I have some questions about pumped glycol systems. What happens if all the entrapped air is not removed from the glycol? Should a closed loop have auto bleed? A. Air bubbles entrapped in the glycol circuit are very detrimental to the thermal performance of the energy recovery system. It causes the heat transfer… Read more »
Ask Rick: How does a high pressure atomizing humidifier work?
Q. How does a high pressure atomizing humidifier work? A. Atomizing humidifiers like the Carel humiFog systems utilize a high pressure (1,000 psi) pumping system to pressurize treated water and pump it to atomizing nozzles. The nozzles then reduce the water jet into a very fine water droplet (10-20 microns). Due to the fine droplet… Read more »