Page 20 - North American Clean Energy May June 2018 Issue

solar power
3445 Heyco_NA 3.5x10_Layout 1 3/22/18 2:21 PM Page 1
HEYCO®
Wire Management Solutions for Solar Installers & Integrators...
Heyco® Solar Products Warranty
Visit www.heyco.com for information about Heyco’s
20 Year Limited Warranty on our solar products.
Helios UVX Clip
The Helios UVX clip installs into a .260˝
(6,6 mm) mounting hole and holds up to
2 cables between .230-.315” (5,8-8,0 mm) each. Molded from our robust UVX nylon 6/6 with extended UV capabilities, for our Solar 20 Year Warranty.
Heyco®-Tite Cordgrips for
Enphase Q Cable
Two new cordgrips now accommodate the Enphase Q Cable. The 1/2˝ version provides liquid tight entry for one Enphase Q Cable; .24x.38˝ (6,1x9,7 mm). The 3/4˝ version provides liquid tight entry for up to two Enphase Q Cables; .24x.38˝ (6,1x9,7 mm) and an additional .130˝ (3,3 mm) dia. hole for a #8 solid grounding cable.
Heyco® HEYClipTM SunRunner® 4-2 & 4-2U
SunRunner 4-2 & 4-2U clips are
compatible with the Enphase Q cable. SunRunner 4-2 works with Everest, SnapNRack, Solar Mount & similar
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Heyco® HEYClipTM SunRunner®
Double-compression design holds from (1) 12 gauge USE-2 to (2) 8 AWG cables up to 8,3 mm OD.
Heyco® HEYClipTM SunRunner® 90, 90-2 & 90-4 Double-compression, right angle design for use with PV modules mounted in “landscape” mode.
Heyco® SunBundler®
Stainless Steel Wire Cable Ties Aircraft grade 302/304 stainless wire
w/UV protected vinyl jacket and stainless steel crimp sleeve, 8˝ (203 mm) to 20˝
(508 mm) lengths–Special lengths available upon request.
NEW
NEW
NEW
Buildings are responsible for 47 percent of global greenhouse gas emissions and, according to Navigant Research, the global building stock is expected to grow by 13 percent from 2014 to 2024.1 However, their contribution to global greenhouse gas emissions can be changed. Much of those emissions come from energy used to operate buildings - this can be reduced, but how? One key element is thermal energy storage technologies.
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Designed especially for commercial rooftop PV installations
Measures incoming solar irradiance and PV panel temperature
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38 MAY•JUNE2018 /// www.nacleanenergy.com
North American Clean Energy 39
Thermal Energy Storage for a Low-Carbon Future
by Mark MacCracken
energy use; it must take into consideration how it can mitigate peak load demand, and the ambient conditions at which
peak load is evaluated. As the ambient temperature increases, the value of stored thermal energy increases.
ermal energy storage has the
most value when it’s needed the most. erefore, its bene t to the grid should be based on how it can perform in extreme-heat conditions. is value is most accurately quanti ed when based on an American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) 1-in-10 heat event approach (hottest hour in 10 years), and when accounting for the dynamic nature of building load.
e ASHRAE approach is often used
for traditional utility infrastructure,
and includes more extreme weather conditions. When this approach is applied to thermal energy storage, the value increases by 28 percent compared with other approaches.2 e prevalent “10-day average baseline” approach underpredicts the value of thermal energy storage up to 77 percent, by excluding demand response events, weekend, and holiday heat events.2 When weekends
are excluded, “temperature drift” and
the signi cant higher thermal loads, required to o set on Mondays following a hot weekend, are not evaluated. To properly quantify the value of thermal energy storage, the value should be based on the load that would have otherwise been needed to provide cooling during extreme-heat conditions. e UC Davis ndings reinforce the bene ts of thermal energy storage to o set thermal load,
and show how we can more accurately estimate electrical grid impact.
Looking more closely at the buildings themselves, the HVAC system is one of the biggest energy-use culprits, making up almost 40 percent of that energy use.1 is is due to conventional air-conditioning systems that run a chiller during peak energy usage and demand times to instantaneously cool. By using thermal energy storage systems, building owners can store energy for later use. ese cooling systems run the same chiller mentioned above, but at o -peak or lower-cost times, to store energy in thermal energy storage tanks. e stored energy can then be
used to cool the building during peak demand and rate periods, with or without instantaneous cooling from the chiller. ese systems help optimize peak load management, and can boost renewable resource use by as much as 50 percent.3 In doing so, grid dependency is reduced, lowering the utility bill.
Even though buildings are large contributors to global greenhouse gas emissions, there is something we can do. Using thermal energy storage systems not only brings those emissions down, but can also save money. It’s a win-win. With a
better understanding of energy storage bene ts, building owners can optimize sustainable building designs and respond more intuitively to grid demand and cost pressures - leading to fewer overall greenhouse gas emissions and lower energy costs. With these bene ts in mind, thermal energy storage will be essential for a low-carbon future.
Mark MacCracken is Vice President of the CALMAC portfolio at Trane.
/|
Trane trane.com
1Navigant Research, Global Building Stock Database. https://www.navigantresearch. com/research/global-building-stock-database. Accessed March 21, 2018.
2Dichter N, Modera M, Fortunato P. Valuation of ermal Energy Storage for Utility Grid Operators. https://www.trane.com/content/dam/Trane/Commercial/global/about-us/ ermal%20Energy%20Storage%20Case%20Study.pdf. Accessed March 12, 2018.
3Reindl D, Van Asselt A, Nellis G, Klein S. Design and Utilization of ermal Energy Storage to Increase the Ability of Power Systems to Support Renewable Energy Resources. 2017. https://www.techstreet.com/standards/rp-1607-design-and-utilization-of-thermal- energy-storage-to-increase-the-ability-of-power-systems-to-support-renewable-energy- resources?product_id=1982754.Accessed March 12, 2018.
Small and lightweight e icient inverter
SolarEdge's HD-Wave technology inverter, winner of the 2016 Intersolar award and 2018 Edison Award, is now available in more power classes. HD-Wave is able to synthesize a clean sine wave which leads to a dramatic reduction in the magnetics and
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ermal energy storage technology allows excess energy to be stored and used at di erent times throughout the day, lessening the demand on and use of the grid. ermal energy storage technology is becoming more prevalent as the industry looks for ways to increase resilience, improve sustainability, and lower operating costs. Shifting peak demand to o -peak hours helps utilities plan for peak capacity requirements, and helps the grid incorporate more renewables. At the same time, it helps electricity customers save money and reduce emissions.
ermal energy storage systems add considerable value to utilities. e research project, Valuation of ermal Energy Storage for Utility Grid Operators, conducted by the Western Cooling E ciency Center at the University of California-Davis (UC Davis), found that thermal energy storage is up to 77 percent more valuable than utilities previously estimated.2 is research demonstrated that the current method for estimating the electrical grid impact of thermal energy storage systems, based on a “10-day average baseline” and “typical meteorological year (TMY3),” underestimates the impact of disconnecting the cooling system on the electrical grid. ermal energy storage can have a major in uence on reducing electrical grid reliance and use. In fact, it’s already doing more than we thought to help reduce greenhouse gas emissions.
As a distributed energy resource, thermal energy storage improves the utilization of transmission
and distribution lines, and renewable generation. erefore, it’s important that we accurately estimate electrical grid impact of thermal energy storage devices, to allow for resource adequacy planning and proper nancial compensation for their service. ermal energy storage requires a holistic view of
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