AWEA state wind energy forum comes to Colorado

Oct. 1, 2014
University of Denver, Colorado

The American Wind Energy Association is inviting regional stakeholders to participate in the 2014 Colorado Wind Energy ForumRedirecting to a non-government site on Oct. 1, 2014, at the University of Denver.

Colorado is on the forefront of wind energy expansion, making it an ideal location for a state-level wind forum. It consistently ranks among the top 10 wind energy states in the country, with installed wind capacity of more than 2,300 MW. In economic terms, that represents an impressive $4 billion in wind investments. At this scale, wind is increasingly cost-competitive, and utilities like Xcel are purchasing more wind power in Colorado to lock in fixed, low-price electricity to save consumers money.

Attendees at the second annual forum can look forward to exploring the current wind market landscape, business opportunities, environmental and political challenges and economic benefits related to wind energy in Colorado. Speakers will cover new developments and different perspectives including EPA’s release of the draft carbon regulations; the implementation of SB252, which expanded the state’s renewable energy standard; and the development of the U.S. Department of Energy’s Wind Vision and its implications for Colorado.

The lunch table topics, last year’s most popular session, gives participants the opportunity to focus on the details in smaller groups. Experts will lead discussions on topics ranging from wind basics and myths to state and national policy to the latest technology developments.

A reception immediately following the forum will continue the dialogue, foster networking and bring partners together to further Colorado’s wind future.

The conference agenda is designed to appeal to stakeholders from all facets of the wind industry. Policy makers, manufacturers, community leaders, financial professionals and power providers should plan to commit one day to acquiring relevant, current, pivotal information related to Colorado’s wind energy landscape. Register online, or contact Larry Flowers, 720-635-4741, for more information. Sponsorship opportunities are also available.

Technology Spotlight: Saving energy with carbon dioxide

Carbon dioxide, the stuff we associate with exacerbating climate change, can actually help prevent climate change and save a lot of energy when used in the right technologies for appropriate applications, such as washing machines and water heaters.

CO2 washing machines
Commercial and industrial washing machines may be the last place you would expect to use CO2. This non-flammable, non-toxic, naturally occurring gas can be pressurized to become a liquid and used to clean laundry. In liquid form, CO2 has low viscosity and acts as a surfactant, which allows proprietary detergent formula to penetrate the fabric better than detergent in hot water. Liquid CO2 also disinfects, making it a good option for hospitals and industries with clean rooms, and a single machine can clean 100 to 200 pounds of laundry per hour.

 About 32 dry cleaning companies in the country are currently cleaning with the Glacier liquid CO2 system supplied by Solvair of Naperville, Illinois. The system uses no water and disinfects clothes completely. (Photo by Solvair Cleaning Technologies)

About 32 dry cleaning companies in the country are currently cleaning with the Glacier liquid CO2 system supplied by Solvair of Naperville, Illinois. The system uses no water and disinfects clothes completely. (Photo by Solvair Cleaning Technologies)

Once the clothes are clean, the CO2 is depressurized so it flashes back into a gas and the laundry is instantly dry. No dryer is needed, which greatly reduces energy use. The liquid gas does not harm delicate fabrics, and clothing lasts longer because high-temperature water and machine agitation are not needed. After each wash, the CO2 is captured, filtered, distilled, re-pressurized and reused.

CO2 washers are appropriate for large, centralized cleaning operations, such as hotels, hospitals, uniform cleaning companies, prisons, nursing homes, textile plants and industries with clean rooms.

According to a recent study by the California Energy Commission (CEC)Redirecting to a non-government site, CO2 washing machines achieved a 60-percent reduction in electrical energy use and a 46-percent reduction in natural gas use when compared with water-based cleaning. Eliminating water use completely provides users with additional savings. The CEC estimates that 8,000 facilities in California would be good candidates for this technology. Just a five-percent market penetration in that one state could save 264 million kilowatt-hours, 20 million therms, and more than 600 million gallons of water, according to the CEC.  The bottom line is that an investment in CO2 washers could have a two- to four-year payback.

CO2 heat pump water heaters
Another up-and-coming CO2 technology is the CO2 heat pump water heater (HPWH). Similar to the HPWHs available at home improvement stores, CO2 models are even more efficient at generating hot water for washing and space heating (with radiant floor, radiators, etc.).

Like CO2 washing machines, these water heaters compress CO2 until it becomes a liquid (at about 1,400 pounds per square inch). CO2 is more efficient than conventional refrigerants, and it has 1,000 times less effect on climate change.

The water tank is larger than a conventional water heater—usually about 80 gallons—allowing for some stratification of the water. The coolest water at the bottom of the tank is piped to the compressor for reheating, which optimizes efficiency. The water temperature is also higher than with a conventional water heater—about 150°F. The higher temperature, combined with a bigger tank, means that more people can take showers before the hot water runs out, even if the system turns off for a while during a utility’s peak demand reduction program.

In the split system version, the compressor and condensing fan are in a separate unit outside, which eliminates noise inside. The variable-speed drives on the fan, compressor and pump (the key to making this equipment so efficient) reduce the noise from the outside unit even more, meaning CO2 HPWHs are usually much quieter than conventional models. This also means the unit does not draw conditioned air from inside the home or small commercial building to heat the water, as un-ducted, single-unit HPWHs do. A smaller (40 gallon), single-unit, ducted CO2 HPWH may be available in the U.S. in the future.  Like the larger split-system version, it benefits from CO2 refrigerant, variable speed and use of outside air.

Even with a bigger tank, hotter water, a highly pressurized refrigerant and a compressor that pulls heat out of outside air during the winter, this technology uses less energy than conventional HPWHs: its efficiency is about 50 percent greater than conventional HPWHs, which are about twice as efficient as a conventional electric water heater. The delivery rate, measured by the number of back-to-back showers you can take without running out of hot water, is also about 50 percent better than a conventional HPWH.  CO2 HPWHs can be especially efficient when used in applications such as a commercial kitchen where the “outside” unit can be mounted high on a wall to provide hot water and cool air.

These are not just manufacturers’ claims, either; these are independent test results from a university and a national lab. The field study Washington State University (WSU) Energy ProgramRedirecting to a non-government site conducted indicates that the systems can provide both space and water heat for highly energy-efficient homes. The WSU Energy Program is working with the Next Step Home Program of the Northwest Energy Efficiency AllianceRedirecting to a non-government site to test this concept in a number of homes. Pacific Northwest National LaboratoryRedirecting to a non-government site is documenting the equipment’s potential to help reduce peak load demand.

Right now, CO2 HPWHs are available in the U.S. only in larger sizes for commercial and industrial applications. But the largest manufacturer expects to roll out their residential version in the U.S. in early 2015. The technology has been used in Asia, Europe and Australia for many years. Learn more about these and other new and emerging technologies from Energy Efficiency Emerging TechnologiesRedirecting to a non-government site.

Still time to register for National Geothermal Summit

Aug. 5-6
Grand Sierra Resort

Don’t miss this opportunity to meet and network with industry professionals and policymakers on issues and topics affecting geothermal development across the country.

Cohosted by the Geothermal Energy Association Redirecting to a non-government site  and Ormat Technologies, Inc.Redirecting to a non-government site  the fourth annual National Geothermal Summit will cover a range of topics including renewable portfolio standard policies, new U.S. codes and standards for geothermal energy, leasing and permitting improvements and the outlook for new renewable power procurements in the Western states. Check out the agenda.

Register today to sponsor, attend or exhibit at the National Geothermal Summit. Please contact Kathy Kent Schott for information about Summit sponsorships. To schedule an interview or request press credentials, please contact Shawna McGregor at The Rosen Group, 917-971-7852.

DOE initiative connects manufacturers, no-cost energy audits

Most industrial customers could use some help trimming or managing their energy use, but small utilities serving those businesses often have their hands full just dealing with the day-to-day business of keeping the lights on. Industrial Assessment Centers (IACs), set up by the Energy Department’s Advanced Manufacturing Office, may have the solution you and your large key accounts need. 

IACs show small- and medium-sized manufacturers how to improve productivity, reduce waste and save energy. These steps can go a long way toward boosting the competitiveness of commercial and industrial customers. Through IAC offices, local university engineering departments and students work with manufacturers to identify energy-efficiency upgrade opportunities in their facilities. 

Teams of faculty and students perform assessments at no cost to the plants. The assessment begins with a one- or two-day site visit, during which engineering measurements are taken. The team then analyzes their results to make specific recommendations. Within a couple of months, the manufacturer receives a report from the team detailing the analysis, findings and recommendations, including estimates of costs, performance and payback times.

IAC recommendations have averaged about $55,000 in potential annual savings for each manufacturer.  IAC assessments are intended for manufacturers with Standard Industrial Classification (SIC) codes 20-39 located within 150 miles of a host campus. The business must have gross annual sales below $100 million, fewer than 500 employees at the plant site and annual energy bills more than $100,000 and less than $2 million.

There are four IACs located in Western’s territory:

  • Colorado State University
  • Iowa State University
  • San Diego State University
  • San Francisco State University

In addition to providing technical assistance to manufacturers, the program partner Rutgers University Center for Advanced Energy Systems maintains a massive database of IAC assessment summaries. Cases can be searched by year, SIC code, NAICS (North American Industry Classification System) code, energy cost, state, products or center. Each record describes the plant (but not the name), and includes a list of recommended measures with the estimated cost and saving of each.

Visitors can also find a description of the assessment process the industrial plant can expect. Additional resources, including a training manual, a self-assessment workbook for small manufacturers and case studies are also available.  Source: Energy Experts, 7/9/14

Learn how new climate regulations to effect energy programs

Monday July 22
12 p.m. CDT

Join Clean Energy AmbassadorsRedirecting to a non-government site (CEA) for a free webinar, What the New EPA Climate Regs Mean for Energy Efficiency and Renewables in Your CommunityRedirecting to a non-government site, on July 22 at noon Central Time.

This webinar is too timely to pass up! Speaker David Wooley of Keyes, Fox & Weidman, LLP, is a long-time friend of CEA who is now working nationally to facilitate win-win strategies for utilities and the communities they serve. He will share an inside look at the new EPA climate regs, focusing on how energy efficiency and renewables may offer cost-effective solutions. You have a lot of questions on this topic, so the event will include an extended Q&A session.

Register today to reserve your place.

DOE efficiency standards take on surprise energy hog

A little-known home energy hog is the target of new efficiency standards the Department of Energy (DOE) issued recently. The new standards cut the cost of powering furnace fans by about 40 percent, while delivering improved comfort. Furnace fans, which circulate heated and cooled air throughout a home, consume more than twice the electricity in a year as a typical new refrigerator.

Most furnace fans are part of a furnace, but in homes with central air conditioning, the fan works year-round, circulating cooled air during the summer and heated air during the winter. Furnace fans consume about 1,000 kilowatt-hours (kWh) per year, or almost 10 percent of the average U.S. home’s total electricity use.

Hidden hog
According to Trends in Energy Efficiency in 2012,Redirecting to a non-government site by the Association of Home Appliance Manufacturers, that is almost 400 kWh more annually than room air conditioners.  The difference in energy consumption is even greater when furnace fans are compared to refrigerators and dishwashers, which the report also did. But the furnace fan is hidden from consumers inside the furnace.

Replacing the permanent split capacitorRedirecting to a non-government site  (PSC) motor that typically drives furnace fans with a brushless permanent magnet (BPM) motor can achieve big energy savings.  The BPM motor meets the new performance standards, is much more efficient and is commercially available today.

DOE estimates that the new standards, which take effect in 2019, will save an average consumer as much as $500 over the life of a furnace fan. On a national level, the standards will reduce electricity consumption by about 500 billion kWh over 30 years of sales, saving businesses and consumers more than $29 billion.

More comfort, less CO2
The American Council for an Energy Efficient EconomyRedirecting to a non-government site  notes that the furnace fan standards can also improve comfort in two ways. First, the more efficient motors do a better job of providing sufficient airflow to circulate the conditioned air.

Second, the new standards are based on the use of multi-stage controls for furnaces, rather than single-stage, “on” or “off” controls. Single-stage furnaces shut off once the desired room temperature is reached, and turn back on again once the temperature drops below a set point. Multi-stage or modulating furnaces, on the other hand, allow the furnace to better match the actual demand for heat by providing two or more levels of heat output (high and low, for example). Operating continuously rather than turning on and off not only reduces fan energy consumption, but also improves comfort by reducing temperature swings.

The energy savings from the new standards for furnace fans also cuts carbon dioxide (CO2) emissions by 34 million metric tons over 11 years. President Obama’s goal is to reduce CO2 emissions by 3 billion metric tons by 2030 through efficiency standards. To date, efficiency standards adopted during the Obama administration will reduce CO2 emissions by more than 2 billion metric tonsRedirecting to a non-government site , save consumers money, increase comfort and help protect the environment all at the same time. Source: American Council for an Energy Efficient Economy, 6/24

Webinar explores mitigating PV interconnections

July 9
11:30 AM – 1:00 PM MDT

Join the National Renewable Energy Laboratory (NREL) for the fifth webinar in the Distributed Generation Interconnection CollaborativeRedirecting to a non-government site Informational webinar series. This webinar series is focused on current and emergent processes and protocols for the interconnection of distributed photovoltaics (PV), with the goal of fostering information and data exchange amongst stakeholders.

Mitigation Measures for Distributed PV InterconnectionRedirecting to a non-government site will spotlight recent national laboratory research and feature speakers Michael Coddington, senior electrical engineering researcher and principal investigator in distributed grid integration at NREL and Robert Broderick, principle member of Technical Staff, Grid Integration at Sandia National Laboratories. Coddington will present findings from a recent survey of 19 U.S. electric utilities including current utility screening practices, technical tools and mitigation strategies used for interconnection of PV to the electric distribution system. Broderick will present findings from a recent Sandia survey of 100 small generator interconnection studies, including the most likely impacts of PV system interconnections and an evaluation of the associated costs.

Space is limited so register today. After registering you will receive a confirmation email containing information about joining the webinar.

Upcoming deadlines

Energy Star program adds clothes dryers

EnergyStarLogoUtilities looking to expand their energy-efficiency programs to include new appliances may want to consider offering rebates for Energy Star-certified clothes dryers. On May 19, the Environmental Protection Agency (EPA) finalized the ENERGY STAR Version 1.0 Specification for Clothes Dryers. The standard will take effect on Jan. 1, 2015. 

Effective in 2015, the new specifications will recognize a selection of high-efficiency electric, gas and compact dryers that will use approximately 20 percent less energy than what the minimum efficiency standards require, the EPA stated. If all residential clothes dryers sold in the United States meet the Energy Star requirements, utility cost savings will grow to more than $1.5 billion annually According to the agency, the increase in efficiency could prevent more than 22 billion pounds of greenhouse gas emissions each year.

Clothes dryers are in more than 80 percent of U.S. homes, and account for about 6 percent of residential electricity consumption. “The addition of clothes dryers expands the range of Energy Star products to include one of the most energy-intensive home appliances not yet covered by the program,” said EPA Administrator Gina McCarthy. “Working with industry on innovative approaches to address our changing climate, we are helping consumers select more energy efficient appliances, save money and reduce greenhouse gas emissions.”

Dryer models that meet the new Energy Star requirements are likely to have improved auto termination sensors, which help reduce energy use by ending the drying cycle once clothes are dry. Some of the more efficient gas and electric Energy Star dryers will employ a promising new technology to recapture the hot air the dryer uses and pump it back into the drum to dry more clothes. Re-using most of the heat creates a heat pump dryer that is more efficient and avoids the need for ducts to exhaust heat out of the laundry room.

The new Energy Star specification also establishes optional “connected” criteria for residential clothes dryers. This connected functionality offers consumers convenience and energy-savings features, such as an alert indicating there is a performance issue, or feedback on the energy-efficiency of different cycle selections. These products will also be “smart grid” ready, making the appliances a natural for demand response programs. Consumers will be able to connect the dryer with their local power provider to take advantage of programs that save them money on their energy bills, and help the utility with load control.

To earn the Energy Star label, products must be certified by an EPA-recognized third party, based on testing in an EPA-recognized laboratory. In addition, manufacturers of the products must participate in verification testing programs operated by recognized certification bodies.

In 2013 alone, Energy Star helped Americans save $30 billion on their utility bills and prevent greenhouse gas emissions equal to those of 38 million homes.

Ask the Energy Experts: Reduce energy use in commercial bathrooms

Question:eexpert_small
Can you recommend ways to save energy in commercial bathrooms?

Answer:
Commercial bathrooms offer many opportunities for energy savings. Bathroom efficiency measures can have a positive effect on any business, but hotels, schools, recreation centers and other facilities with large multiple bathrooms can really benefit from the following measures.

Insulate piping
Most codes require insulation for hot-water piping, but insulation may have been damaged or removed during maintenance operations. Replace it with the minimum insulation required by your jurisdiction’s most recent energy code, or better. For example, the Washington State Energy Code requires a minimum of half an inch of insulation, with a conductivity between 0.24 and 0.28 (roughly R-4 per inch) for supply lines up to 2 inches in diameter, and 1-inch insulation for piping up to 4 inches in diameter.

Reduce flow
Reduction of domestic hot water (DHW) consumption can be accomplished by limiting the flow rate from fixtures, automatically shutting off the hot (and cold) water after a measured time interval and reducing supply temperatures. The first two measures are required by most plumbing codes for facilities open to the general public. Flow rates are usually limited to 2 gallons per minute (gpm) with the requirement that the valve self–close within 30 seconds. Self-closing faucets can save money and energy – and prevent vandalism. Also, the Building Energy Software Tools Directory, by the Department of Energy, provides links to several useful general water conservation software tools.

Reduce temperature
Many codes and statutes also limit the maximum temperature at lavatories in commercial buildings to 120 degrees. Resetting the water heater thermostat to deliver 120-degree water is usually a simple and cost-effective way to save energy in bathrooms. For water heaters serving additional, higher temperature hot water loads (dishwashers, etc.), equip the fixture with a thermostatic mixing valve or a booster heater for the higher temperature loads.

Control recirculation
Larger commercial buildings usually have systems to recirculate hot water from the most remote hot water fixture back to the water heater. The idea is to keep the water in the distribution piping hot at all times and reduce the time a user must wait for hot water. Many state and federal energy codes now require a time clock or other automated means to shut down the hot water recirculation pump during unoccupied hours. These controls save energy by eliminating heat loss from the recirculation piping when the building is unoccupied. They also cut the run time and electrical consumption of the recirculation pump by almost half.

Upgrade lighting
Bathrooms are occupied only intermittently, usually less than 20 percent of the time. That makes bathroom lighting in a commercial establishment the perfect application for occupancy sensors that turn off the lights when the bathroom is not in use.

Recover heat
Exhaust systems are another energy-user in bathrooms. In larger commercial buildings, a single fan often serves several bathrooms and it runs during the occupied hours. In small commercial buildings, the exhaust fan is often wired to the light switch and only runs when the lights are on. This can lead to under-ventilation of the bathrooms and indoor air quality (IAQ) problems. Modifying light switch-operated fans to run during the occupied hours will increase building energy use slightly, but will improve IAQ.

You can make up that loss by using the moist exhaust air leaving the building to preheat (or cool) outside air. Learn more about heat recovery ventilatorsRedirecting to a non-government site, from the Energy Efficiency Emerging Technologies Database. This collection of practical, commercially available, but not yet widely used energy efficiency technologies is regularly reviewed and evaluated by energy experts and engineers.

Upgrade heating system
Bathrooms are usually located in the core of larger buildings with no outside walls. However, some smaller buildings have bathrooms on outside walls that need to be heated in winter. The heat source for outside wall bathrooms is often an electric resistance heater that runs constantly. Consider installing a programmable thermostat (line voltage or 24v. as appropriate) or a connection to the building energy management and control system to limit operating hours and save energy.