Friday, February 24, 2017
Scott L. Price, P.E.
Electrical Engineering/IT Manager
Hunt Utilities Group LLC http://www.hugllc.com
Pine River, MN (218) 587-5001
MN Electrical Licenses: Master #AM08525 Power Limited #PL11071
Thursday, December 8, 2011
Friday, November 18, 2011
The Mani Shop was built to retain the heat from the sun in all weather. On hot days or cold it has become apparent that the building design sometimes works too well. People with offices in the center of the building are often times sweating in the dead of winter.
This summer, a water based AC unit was installed to help with this problem. It works wonderfully. However, now that winter is here, an AC unit that relies on ground water will not cut it. So, identifying resources on hand, Mike and Ryan decided that cool air from the outside works just as well as cool water.
Therefore, our resilient team simply cut an insulated opening in an outside wall and connected home made ducts throughout the building. This will bring the cool air into the overheating rooms inside while maintaining the building's initial design feature.
Tuesday, October 4, 2011
The atrium was initially designed to be a greenhouse, and with the south facing wall made up entirely of heat absorbing windows, it would become too hot for participants to bear. So, a solution was needed before the event began.
We decided that hanging a large piece of black cloth across the south facing windows was the solution we needed. (Some people call this contraption a "curtain.") However, it was decided, that this curtain needed to be done in style.
So, Wayne designed a little motor that would run up and down the metal posts set aside at each end of the cloth. This little motor would roll up the cloth and let more light in. If it gets too hot, the little motor runs down the metal posts and takes the black cloth down with it, creating more shade and blocking out the sunlight.
Wednesday, August 3, 2011
And just outside the back of the shop, Mark and Dan are spending the day whipping up a replacement outhouse. Normally, we'd prefer a sawdust toilet in properties like the one this is for, but in this case, the usage is so light and the outhouse tank is already in place, that it makes sense.
Tuesday, July 5, 2011
The Mani Shop has gotten a little bit cooler recently. With RREAL's expansion last fall, we rearranged the HUG offices in the building. This rearrangement made the greenhouse the main hallway and we found that in the summer heat this made the attached offices extremely uncomfortable. With a large area to cool and high costs of operating a concern, a normal air conditioning unit would not meet the needs of the shop. So, a new air conditioner was designed.
Using a furnace blower as the core, we designed the unit to work with cold water instead of a compressor. Using a radiator coil we inherited from an old grocery store, we are able to transfer the cold via an air exchanger to the blower at a rate of 2.5 gallons per second. We get a second use out of the water, too. We divert the water after it's used to help in watering the living garden on the roof via a sprinkler system. Plus, any additional overflow goes to the pond in front of the Mani Shop.
Here you can see Ryan installing the holes for the duct work.
It also recirculates the air it uses. This lets the unit work less often and keeps the air in the building colder, longer. This is very useful because the AC unity can push up to 2000 cubic feet of air per minute. This recirculation cleans the air and with an activated charcoal filter, it helps keep the air fresh by absorbing odors.
The system is working wonderfully, now. In fact, on Friday we had several little girls splashing through the sprinkler system on the roof. Sounds like we got it online just in time.
Friday, July 1, 2011
The powered conveyor roller only consumes 5W, and since the belt gives off almost 500W of heat, the coefficient of performance is almost 100.
The same belt extends outside where it absorbs the sun's energy. The glazing is inexpensive 6mm twin-wall polycarbonate. The belt is made from an EPDM pond liner. It is not as black as it could be, so the overall efficiency of the system is about 40-50%.