Tag Archives: Denver

NREL Develops Energy Audit Tool

concept3D (1)The National Renewable Energy Laboratory (NREL) and Denver-based software developer concept3D have developed the simuwatt Energy Auditor, a tool that could replace clipboard-style audits with a computer model that could save money for building owners.

The tool that pinpoints potential energy savings could cost 35 percent to 75 percent less than traditional audits. The package is set to hit the energy retrofit industry next year after tests are completed at six Department of Defense facilities over the next few months.

Audits conducted by energy service companies (ESCOs) could be cost-prohibitive for a small building owner. But the simuwatt Energy Auditor allow ESCOs to perform audits using mobile tablets and advanced energy modeling, skipping the steps of manual input and transfer. The intent is that lower costs would create more savings and extend the benefits to even more building owners.

Also, the finished audit is stored electronically and serves as the baseline for the next audit, which is typically done a few years later.

NREL said the simuwatt Energy Auditor is a combination of different ideas that marry the energy audit with energy modeling through OpenStudio and other tools. NREL said no other commercially available product has the ability to collect building data onsite, automatically move the data into an analysis tool, and perform a detailed energy simulation this quickly.

The commercial buildings sector in the US alone represents 7 percent of total energy consumption worldwide. Commercial buildings consume about $134 billion in electricity each year, according to DOE. A 200,000-square-foot office building that pays $2 per square foot in energy costs annually can save tens of thousands of dollars with a modest reduction in energy consumption.

 

Photo credit: Dennis Schroeder

Saving Energy with Psychrometric Calculations

Saving Energy with Psychrometric Calculations By: John Becker

Hands up, who’s heard of psychrometrics?  You may think you haven’t, but if you’ve ever listened to a weather forecast I guarantee you have… Psychrometrics are the way engineers (and weather forecasters) describe a mixture of air and water vapor.  The air all around us contains some water vapor, which makes certain calculations a little complicated.  So why do we need to calculate these things?  Read on to find out…

One of the ways a building automation system can save you energy is by using cool outside air at certain times of the year instead of mechanical cooling.  This is called economizing or free cooling.  There are two types of economizers, dry bulb and enthalpy (a.k.a. wet bulb).  This is where psychrometrics come into play.

A typical dry bulb economizer would bring in outside air below a certain dry bulb temperature.  But this doesn’t account for the total heat energy contained in the air.  By measuring only the dry bulb temperature, the heat energy resulting from the presence of water vapor is ignored.  This can make a significant difference.  For example, you might inadvertently bring in cool but very humid outside air, causing your building to feel muggy and uncomfortable.  Or you could miss out on using some very dry outside air that’s a little warmer but could help remove heat and moisture from your building.

Psychrometric Chart

This psychrometric chart illustrates the benefit of using an enthalpy economizer.

If you look at the chart on the left, you can see the difference.  The area shaded blue represents conditions that a dry bulb economizer would consider adequate for cooling.  The area shaded green represents the ADDED conditions that an enthalpy economizer would consider adequate.  In this example it doubles the available conditions for economizing.  This can result in higher energy savings than with a dry bulb economizer.

Implementing an enthalpy economizer requires measurement of outdoor relative humidity in addition to temperature.  The GCL+ program below illustrates how to calculate Enthalpy, Dew Point, and Wet Bulb Temperature given Dry Bulb Temperature and Relative Humidity (all temperatures in °F).

This GCL+ program calculates various psychrometric properties of air.

This GCL+ program calculates various psychrometric properties of air.

Here is a version of the program you can see better and copy into one of your own Delta controllers:

// Calculates psychrometric properties based on Dry Bulb Temp (deg. F) and Relative Humidity.

Variable A As Real
Variable B As Real
Variable P As Real

A = (‘Outside Temp‘ – ‘Dewpoint‘) / 10
B = (A1)
P = 12.2 // Atmospheric pressure in psi (Denver)

Enthalpy‘ = Enthalpy (‘Outside RH‘, ‘Outside Temp‘, °F)
Dewpoint‘ = DewPoint (‘Outside RH‘, ‘Outside Temp‘, °F)

// Equation from Naval Weather Service Technical Note #7
If ‘Outside Temp‘ >= 0 Then
Wet Bulb‘ = ‘Outside Temp‘ – (0.034 * A0.00072 * A * B) * (‘Outside Temp‘ + ‘Dewpoint‘ – 4 * P + 108)
Else
Wet Bulb‘ = ‘Outside Temp‘ – (0.034 * A0.006 * 2) * (0.6 * (‘Outside Temp‘ – ‘Dewpoint‘) – 4 * P + 108)
End If

This is just one example of what you can learn by attending our free Delta Controls training classes.  We’ll be adding new session soon, so stay tuned!

AFEC Trade Show 2013

This years AFEC (Advanced Facilities Management and Engineering Conference) was last week September 25th and 26th. The AFEC Show is dedicated to increasing the skills and knowledge of Facility Managers and Engineers in the Rocky Mountain Region, preparing them to meet the demands of their occupation, today, tomorrow, and into the future. AFEC is the largest event in the Rocky Mountain region and is dedicated to facilities management and engineering professionals.

Setpoint Systems Corporation has been involved with the AFEC Trade Show for the past 8 years, and had another great year in 2013. We had the opportunity to connect with current customers and engage in conversations with potential customers. Our entire sales team was a part of contributing to the show; from set up to breakdown, and manning the booth. This year we had some fun contests that we will be giving away to 3 attendees at AFEC Trade Show. We will give away 1 trip to Breckenridge, and 2 sets of Club Level tickets to the Denver Broncos. The winners will be drawn at random and announced later this afternoon!

We are looking forward to next year and would like to thank all the sponsors of the AFEC Show: AFEE, BOAC, Xcel Energy, IFMA, Rocky Mountain ASHRAE, BOMA, CAHED, RMAEE, Alliance for Sustainable Colorado, Colorado Real Estate Journal, Colorado Facilities Solutions for Building Owners & Managers.

Thank You,

Your Friends at Setpoint Systems Corporation 

Setpoint Systems Corporation Is Growing!

Wow, what a terrific year, and while a short time left there is still so much to do! Over the past 4 months we have had some really exciting additions to our team. Additions, whom have contributed greatly to our culture, diversity, and experience here at Setpoint Systems Corporation.

We have the pleasure of introducing you to the following “new to Setpoint” employees, but not new to the industry. The wealth of knowledge and experience they bring to the team is invaluable:

  • Michael “Mike” Lee- Account Manager (Littleton, Colorado)
  • Randy Rinker- Account Manager (Littleton, Colorado)
  • David Peterson- Account Manager (Irvine, California)
  • Kevin Langston- Account Manager (Denver, Colorado)
  • Barney Cooper- technician (Minnesota)
  • Zeke Reardon- technician Denver, Colorado)
  • Kristel Puryear- Dispatch/Customer Service (Denver, Colorado)

We warmly welcome these new additions to the team, say hello by leaving a comment below. Following this post will be complete bio’s on these our new additions, check back to get to know them a little better!

As we continue to grow we are actively looking for more talented, diverse and intelligent candidates. See our open positions here:

http://setpointsystems.theresumator.com/apply

Visit us online at: www.setpointsystems.com