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Welcome to Sustainable Insights. This blog is a source of news and information on two of our favorite topics - data loggers and sustainability - and offers a glimpse into some real-world environmental monitoring projects happening around the globe.


May 28, 2009

Will society unplug?

Category: Energy Monitoring, Green News – Onset Blog Admin – 4:16 pm

By Elisa Wood

May 21, 2009

As a society, we’re accused of being too plugged-in, too reliant on our computers, televisions, and charged-up cell phones. Turns out, we are willing to unplug.

A study by SmartPower (http://www.smartpower.org/) found that unplugging unused appliances, those sucking up vampire energy, is an energy savings act people are willing to do. And they don’t just say they will unplug – they do unplug.

This is an important distinction because often people tell researchers that they intend to conserve power or buy renewable energy. But when it comes time to do act, they balk. SmartPower was able to discern where and when people walk-the-walk through a “Living Diary” study, part of a two-year effort in New England to see how the economy, volatile energy prices and environmental concerns motivate consumers.

Smartpower followed the activities of 81 people for two weeks. The participants were given daily questions, homework and tasks, which led to over 1,000 diary entries.

“Unplugging was the most frequent efficiency experience. Panelists reported that it was the easiest to perform, required the least sacrifice and was the most universally relevant to all participants,” SmartPower said in recent comments filed before the Connecticut Department of Public Utility Control.

Such research becomes increasingly important as the industry seeks ways to spur consumers to act in a more energy efficient way, an approach known as “residential behavioral strategy.”

In Connecticut, SmartPower and two other companies have proposed an ambitious behavioral strategy program intended to encourage people to cut energy use 20% by 2020. The trio – which also includes Earth Markets (http://earthmarkets.com/), a finance company, and Efficiency 2.0 (http://efficiency20.com/), a software firm – offers consumers several goodies, among them free compact fluorescent lights and software to monitor energy use online.

But that’s not all. The program includes two of the biggest all-time motivators for the US consumer: beating the Jones and earning cash. Communities compete to see who saves the most energy and the results appear on line for all to see. In addition, participants have the chance to earn money through the sale of efficiency certificates or “white tags,” a currency of value in Connecticut. Consumers and businesses can earn a certificate for each megawatthour of energy they save. They sell the white tags to utilities and others who must, under state law, produce or buy a certain number each year to help the state achieve its efficiency goals.

The program must still win regulatory approval (http://www.dpuc.state.ct.us/dockcurr.nsf/(Web+Main+View/Search+Electric)?OpenView&StartKey=05-07-19RE02) . But if it does, its 200,000 customers would not only earn money from white tags but also save money on their energy bills – for a total financial gain estimated to be $100 million.

Not a bad benefit. Definitely worth the time of unplugging the appliances at night.

May 4, 2009

4-20 Milli-amp Current Loops – Power Supply Panel Parts

Category: 4-20mA, Current Loops, Energy Monitoring, Green Building, How To – Onset Blog Admin – 8:27 am

89902-david_sellersThe following post in an excerpt from CSE live.
By David Sellers

Sorry for the break in the string; we just changed the software platform that drives the blog and its taken me some time to get everything set up and working with the new system. But hopefully, at this point, I am good to go and can pick up where I left off and keep moving forward.

My previous posts before the transition to the new system had been exploring 4-20 milliamp current loops, including why we use them in the first place , what they are and how they work , and how to interpret the information they provide . In this post, I’ll begin to discuss how you can hook a current loop up to a typcial data logger. I’ll be discussing how I hook them up with the Onset HOBO H8 and U12 families.. But the concepts can be applied to loggers by other manufacturers.

Most loggers accept temperature and ac current inputs directly. Temperature measurement is typically accomplished by measuring a resistance element such as a thermistor in a bridge circuit using very little power. The current transformers (CTs) typically used to measure ac current are actually self-exciting; i.e. the current they are measuring generates the measured signal via induction. Using a current loop with a logger is a bit more challenging because current loops need a power source to drive them.

That’s the down side. The up side is that being able to pick up a 4-20 milliamp signal opens the door to measuring just about anything from flow to pressure to carbon dioxide. You can even “piggy-back” onto an existing 4-20 milliamp signal by simply inserting your load resistor in series with it as I discussed previously . So, if you are in the data logging business for the long haul, as is the case for most commissioning folks and a lot of operations folks, then investing in a DC power supply panel or two can make a lot of sense. And, if you are like most field people, you will enjoy the process of putting one together.

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