Thank You, Steve Norberg!

On January 4, Mulcahy bid farewell to a fixture in the engineering community. Steve Norberg dedicated decades of his career working for engineering firms including Erickson Ellison, Dunham, and KFI. His work emphasis was on school and healthcare projects in the state of Minnesota, along with work at the airport for many years. At Mulcahy, he continued that work in the design and support of HVAC systems for over six years to the benefit of the engineers, contractors, and facilities with whom he worked. He built lasting relationships in organizations like the Minnesota Educational Facilities Management Professionals and the Minnesota Healthcare Engineers Association. Head to one of their conferences with him and you won’t get two feet before he stops to great someone with a familiar smile.

On behalf of Mulcahy, we want to thank Steve for his years of service in the engineering community.

Steve plans to do some warm-weather travel with his wife Ivonne, and keep up on his poker game at Running Aces. Don’t be surprised to see him around in the fall when conference season heats up. We wish Steve well in his well-deserved retirement. Congratulations, Steve!

Mulcahy Recommends: Zupa Toscana Soup Recipe

You’ll love this Italian soup loaded with sausage and potatoes. This recipe is a personal favorite from one of Mulcahy’s own.

What You’ll Need

  • 1 pound of Italian sausage
  • ½ Tbsp. red pepper flakes
  • ¼ cup chopped white onion
  • 2 cloves of garlic
  • 4 tbsp. bacon pieces
  • 8 cups of chicken broth
  • 2 cups water
  • 1 cup of half & half
  • 2 large potatoes (sliced thin)
  • 1 cup kale
  • Salt & pepper

How to Make It

  1. In a large soup pot, brown the sausage with red pepper flakes.
  2. While the sausage is cooking, slice up your potatoes nice & thin then quarter the slices.
  3. Chop up your onions and mince your garlic.
  4. Once the sausage is cooked, remove from pan and drain. With a small amount of oil remaining in pot, add onions, garlic and cooked bacon pieces. Saute until onions are transparent.
  5. Add the broth and water to the soup pot.
  6. Carefully pour in your potatoes. Bring to a boil and then Reduce the heat and simmer until potatoes are tender (around 10 minutes or so).
  7. While potatoes are cooking, rinse and chop your kale.
  8. Once your potatoes have cooked through, add the half & half and Italian sausage. Cook the soup until heated through.
  9. Add the kale. Remove from heat and serve.

Serve with bread sticks.

Plate & Frame Heat Exchangers – AHRI Certification

Plate and frame heat exchangers are utilized often in hydronic systems. Designers especially like the ability of plate and frame heat exchangers to have a very close approach temperature between the hot and cold fluids (Sometimes only 2 degrees F apart). However, as the approach temperature gets smaller, the heat exchanger gets larger and more expensive by an inverse proportion. This is often where unscrupulous manufacturers take advantage of engineer specifications. The difference in heat exchanger area between a 2 and a 2.5 degree F approach heat exchanger is about 25%. The key is the PERCENTAGE change. The water may only be ½ a degree cooler/warmer, but the heat exchanger will be a lot smaller. If the smaller heat exchanger can work, the engineer should make that decision, not a supplier trying to be lower priced than his competitors. Computer printouts can easily be manipulated to provide a convincing statement that the unit will meet specifications.

Now, how can an engineer be sure that they are getting what they are asking for? The answer is fairly simple. Specify that the heat exchanger be AHRI certified. This standard has been available for years and regulates how manufacturers can rate their units. Many manufacturers have signed on so there is nothing proprietary about requiring it. Bell & Gossett was an original adopter of AHRI certification for its GPX series gasketed plate and frame heat exchangers.

The Recently Expanded Current Scope of AHRI:

  • Fluids water or sea water only flow rates <= 20,000 gpm
  • Heat load <= 240,000,000 btu/h
  • HVAC application as defined as equipment located in a residential or commercial building exclusively used for conditioning spaces for the occupants of the building
  • Intended for use in the U.S, U.S. Territories, and Canada

What AHRI Certified Means:

  • Manufacturers may only ship units AHRI compliant units if they fall within the current scope
  • Product performance was determined in a consistent manner across all manufacturers
  • Units are subjected to rigorous and continuous testing
  • Performance ratings are independently measured
  • Provides marketplace clarity
  • Allows use of the AHRI certification mark

The AHRI certification covers all Bell & Gossett GPX models from the Model P4 to the Model P200 and provides our customers with reassurance that they can depend on Bell & Gossett for products with guaranteed performance.

At one time or another, everyone has struggled to compete on a level playing field when proposing GPX Gasketed Plate & Frame heat exchangers. Your plate & frame- specification should now include AHRI Certification requirement. This certification provides an unbiased, uniform method to assure the heat exchanger manufacturer can document the published thermal performance of their heat exchanger to a third party.