Solar Hot Water Collector Flow

Reader asks:

I’m curious about flow rate through solar water heating collectors and how that affects an SWH system’s efficiency. On one hand, it seems like a slower rate would allow more heat gain, since the water spends more time in the collector. But I also understand that efficiency is higher with water that is at a lower temperature. So then I assume that more water moving through the collector more quickly (even if it’s not getting as hot per cycle), is actually more efficient overall. Either way, how is a pump sized and flow rate optimized for maximum efficiency?

2 MW Solar Project At Rio Tinto Stadium In Utah

Norway-based REC Group has supplied its photovoltaic modules for the newly commissioned 2 MW solar installation at Rio Tinto Stadium in Sandy, Utah.

The sports facility, which is the home of Major League Soccer’s Real Salt Lake club and United Soccer League’s Real Monarchs, incorporates 6,414 REC Peak Energy 315 W, 72-cell solar panels spread across several solar parking structures and rooftops.

Want to build and profit from a solar EV charge station for electric cars?

It seems like a perfect combination: solar power and electric vehicles (EVs). Simply set up some charging stations that are powered by solar panels, and the EV driver can enjoy an emissions-free recharge. After all, solar costs are decreasing, and EVs are gaining in popularity, so why not combine the two?

Several charging station providers and solar companies say it is indeed possible to have solar supply at least some of the electricity to power plug-in vehicles, but there are a number of hurdles to a wide rollout of solar-powered EV charging stations.

Solar Financing Trends: Where They Are And Where They Are Headed

It is always a good indication that a market is maturing when consistent, less expensive sources of capital appear. Now more than ever, there are more sources of capital for solar transactions - especially debt in the commercial and industrial (C&I)/middle-market solar space. Non-bank lenders, regional banks and a few large national banks are creating renewable energy finance programs to meet the needs of this sector. This surge in competition to finance projects is driving rates and fees down on a regional basis.

Why is Energy Storage Such an Important Part of the Renewables Mix

In order to maintain the flow of power flowing efficiently, utility operators must attempt to steady the supply and demand consistently in order to meet peak demand.

energy diagram

Energy storage has become a hot topic in the industry in the last couple of years, but what is it all about?

Understanding Maximum Power Points (MPP)

multiple controllers

Designing systems so that panels operate as close as possible to their Maximum Power Point is critical to maximizing the performance of the system. A large central inverter such as the Solectria 500XTM has one power point, which means that all panels in the array will produce the same voltage and amperage. If the array is uniform and free from shading, this is generally not a major issue.


Solar Thermal Heating Makes A Perfect Complement To PV Electricity Generation

The manufacturers of solar pool-heating systems and solar hot water heating systems are seeing a resurgence in business activity. This is good news on all fronts.

The economy is stronger and the recession is behind us. We need to be prudent moving forward, but we are clearly in a better business environment today than we have been in the past seven years.

The U.S. Solar Domestic Hot Water Industry Is Dissolving Itself

The U.S. solar domestic hot water (SDHW) industry is in a state of dissolution due to historic trends and self-inflicted wounds.

Two historic trends and associated events have severely damaged the SDHW industry; the rapid fall in natural gas (NG) prices since 2008 and the parallel fall in photovoltaic system prices have all but pushed SDHW out of the market.

Suniva Powers Sundance Theater

What chemicals should I use to clean solar panels?

Cleaning modules in large commercial arrays is done based on a cost-benefit analysis that compares cleaning costs with the revenue increase that results from the improved array output. Most residential and small commercial users want their array to perform optimally all the time, and may therefore clean them more often than commercial arrays are cleaned.


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