Posts Tagged ‘Solar Hot Water Heater’

24 January

Response From Kiva-More Green or Solar Businesses in the Future


Dear Readers,

(Please click onred links below)

If you are in favor of renewable,  clean, or solar energy, please sign this petition for FIT/CLEAN Program, accessible at Thank you very much.

Dear Friends and Readers,

I’d like to share part of an email from Kiva, by one of its Customer Service Team members, below:


Kiva has piloted green lending with a small number of loans that have been posted on our website, and if you search, you can see that some green loans that have been funded on Kiva over the past year.

Now, we’re beginning to focus on expanding our green loan offerings. To do this, we are working on finding new Field Partners who offer green loans and we’re also working on creating incentives to encourage our current Field Partners to post more green loans. We hope to have more green loans posted that include both business and personal loans that reduce waste and pollution or deal with recycling and repurposing used materials.

In the meantime, you can check out this Field Partner in Kenya:
This field partner received a “innovation” social performance badge.

For more information about social performance badges in innovation you can check out this link:

*I learned something new today, from the video clip below: Kiva means Unity and Agreement in Swahili


Dear Friends & Readers, please keep in mind that solar energy businesses would fall under the Green Business Attribute at Kiva because solar energy businesses would help to reduce waste and pollution. Examples such as solar cookers (please refer to Jan. 5-9, 2012 posts of Jan. 5, 2012 post of ; Jan. 6, 2012 post of ; Jan. 7, 2012 post of ; Jan. 9, 2012 post of, solar hot water heater (April 6-7, 2011 posts of , April 6, 2011 post of , April 7, 2011 post of ), and solar panels, etc. would help to reduce pollution (July 31, 2011 post of ,  July 31, 2011 post of in developing countries.  This will ultimately impact all of us, regardless which part of the planet earth you/we reside in.  So, let’s wish Kiva the best in their future endeavors in finding more new Field Partners familiar with the possibilities of Green/Solar/Renewable Energy Businesses.  Those of you reading this post, if you have more suggestions/comments/ideas for small solar/renewable energy businesses for developing nations and/or USA, please email me at and I’ll be happy to share your suggestions with Kiva and various universities and project organizational groups  .  Let’s spread the small Green/Solar/Renewable Energy businesses throughout the planet earth like wild fire…cooperating together, we can make our world a better place!

~have a bright and sunny day~

written and posted by sunisthefuture-Susan Sun Nunamaker,

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4 August

Prelude To President Obama’s 50th Birthday Present-Grass Root Feed-In-Tariff/CLEAN Program Petition


Dear Friends, Readers, and Fellow Fans of Sunshine,

If you are in favor of renewable/CLEAN energy, please sign the petition page showing support for FIT/CLEAN Program at Thank you.

I’d like to share with you one of my correspondences today:

Energy <>
date Wed, Aug 3, 2011 at 5:47 PM

Greetings, Director Bird,

I would like to celebrate President Obama’s birthday with all of his supporters, but my 79/80 year old mother is having health problem this week and I am watching her carefully today. I will try to make it to the celebration if her condition improves more. But if I will not be able to make it to the celebration, then I would like to present my birthday present for President Obama here, with all of your help, my/our effort in trying to start a grass root movement (support for the the Feed-In-Tariff/CLEAN Program) in the form of petition campaign that would help to address the question of job creation and economic prosperity for the state of Florida and many communities of USA if we would implement Feed-In-Tariff/CLEAN Program. I have started a web site, , to promote better understanding of renewable/solar energy and to educate general public and hopefully to drum up sufficient attention and support for Feed-In-Tariff/CLEAN Program in order for FIT/CLEAN Program to be introduced as a separate Senate Bill for state of Florida. I will be setting up the petition page later today (I am targeting before midnight of  Aug. 4, President Obama’s birthday), but in the mean time, I would like to invite all of you to view articles and listen to all the video clips at . Go to the search box at right side of the Homepage and type in:
Solar Plane
Cars of the Future
Solar Hot Water Heater
Solar Shingle
Incentive For Solar
Why Should We Power The World With Wind-Water-Sunlight Quickly
Peak Oil
Why Solar
What Is Solar Cell
Please pay special attention to discussions on Feed-In-Tariff because I believe this incentive program will be able to help create hundreds of thousands of jobs for Florida and USA, boost our economy, and move us toward the Renewable/Wind-Water-Solar Energy Age. I have seen first hand how much hope and enthusiasm this program had generated for many other countries. Please publicize this program and the site so we can get the petition campaign started. I thank you for your attention and time. Please tell as many of the supporters about as possible. I was told that I would need more than 700,000 Floridians’ signatures. We need to get started ASAP.

Susan Sun Nunamaker

posted by sunisthefuture-Susan Sun Nunamaker,


7 April

Solar Water Heater-How It Works (4)


If you are in favor of renewable/CLEAN energy, please sign the petition page showing support for FIT/CLEAN Program at Thank you.

I understand there may be more details and variations in designs or material for different solar water heating systems.  But keep in mind that my focus here is on the basics.  Some of you may be a bit overwhelmed by this series, but I believe the following video clip will help to reinforce some of my previous discussions and clear away some confusions.  Truly, if a picture is worth a thousand words, then a minute of video clip will surely be worth about 1,800,000 words (given that there are approximately 30 images per second, 60 seconds per minute, 1000 words per image therefore, 30 x 60 x 1000 = 1,800,000).  So,  I would like to conclude this series of discussion by showing you a video clip from: or click below:



To increase/promote more use of solar water heater system and many other solar energy projects, often time government intervention via incentive programs would help to speed up the process of solar energy use in many countries.

Our friends/readers from UK commented on a very successful incentive program, Feed In Tariff, currently being operated in many countries throughout the planet earth.  So, I will be looking into this issue and share with you what I have found regarding various incentive programs that had been tried and tested in different areas/countries.  This will be discussed in our next series, so stay tuned in at the same bat channel.  Until then, I bid you a bright and sunny day~

Posted by sunisthefuture-Susan Sun Nunamaker,

7 April

Solar Water Heater-How It Works (3)


If you are in favor of renewable/CLEAN energy, please sign the petition page showing support for FIT/CLEAN Program at Thank you.

Dear friends and readers, let’s continue to look into the workings of Solar Water Heater.  The simplest approach to heat water with solar energy is to simply mount a metal tank filled with water in a sunny place.  The heat from the sun would then heat the metal tank and the water inside and this is how the very first Solar Water Heating systems worked more than a century ago.  But the inefficiency in this system is: once the tank and water has started to be heated, the heat gained would be lost back into the environment until the water in the tank would assume the ambient (surrounding environment) temperature.  Therefore, the challenge is to limit the heat loss from the tank and delaying the time until thermal equilibrium is reached. To meet this challenge, there are three types of solar collectors most commonly used in the solar water heating systems, described below:

An ICS (Integrated Collector Storage) system or batch collector

  1. ICS (Integrated Collector-Storage) systems or batch collectors:to limit the heat loss from the tank back into the environment, water tank is encased in a glass-topped box that allows heat from the sun to reach the water tank, while the other walls of the box are thermally insulated, reducing convection as well as radiation to the environment.  Furthermore, the box can also have a reflective surface on the inside. This reflects heat lost from the tank back towards the tank. (think of an ICS solar water heater as a water tank that has been enclosed in a type of “oven” that retains heat from the sun as well as heat of the water in the tank.  Variations of this basic design may be composed of several smaller water containers and even including evacuated glass tube technology.  Since the amount of heat that a tank can absorb from the sun is largely dependent on the surface of the tank directly exposed to the sun, it follows that a small surface would limit the degree to which the water can be heated by the sun.  Therefore most modern collectors attempt to increase the efficiency warming of the water in the tank by increasing the surface-to-volume ratioThe ICS systems are often installed in areas where the temperature is very low and heating from solar energy is not sufficient. So cold water is first heated in the solar collector, then to the insulated tank, and finally passed to the conventional water heater that ensures the heating of the water to required temperature levels.

    Flat Plate Collectors for Solar Water Heating System (Source: Wikimedia Commons)

  2. Flat plate collectors: these collectors are flat in shape and oriented towards the sun, enclosing a network of piping, applying the basic idea of “oven”-like box.  Here a  pipe is connected to the water tank and the water is circulated through this pipe and back into the tank.  The water tank is now outside the collector that only contains the pipes.  Most of these flat plate collectors’ pipes have diameters less than 1 cm in order to increase the surface-to-volume ratio (recall this would help to increase the efficiency of the warming process of the water).  At the top there is one or more layers of glass or plastic cover on which the sunlight falls. The light is then absorbed by the absorber plate (metal plate such as aluminum). There are piping of water absorbing the heat from the absorber plate.  The most commonly used solar water heating system is the flat plate collectors, which are usually insulated and weather shielded.
  3. Evacuated tube collectors: these collectors are comprised of parallel rows of the glass tubes which are exposed directly to the sunlight.  The water piping in an evacuated tube collector is surrounded by two concentric tubes of glass with a vacuum  in between that admits heat from the sun (to heat the pipe) but also limits the heat loss back to the environment.  The inner tube is coated with a thermal absorbent. These solar collectors are usually used for commercial applications where maximum amount of heat to be absorbed and the losses due to radiations have to be reduced.

    Evacuated Tube Collectors (Source: Wikimedia Commons)

    Flat plate collectors are generally more efficient than evacuated tube collectors in full sunshine conditions, but energy output of flat plate collectors drops off rapidly in cloudy or cool conditions compared to the output of evacuated tube collectors that decreases less rapidly.


For better understanding of these systems, please stay tuned in my next episode of Solar Water Heater-How It Works (4).  There will be a rather enlightening clip waiting for you.

posted by sunisthefuture-Susan Sun Nunamaker,

6 April

Solar Water Heater-How It Works (2)


If you are in favor of renewable/CLEAN energy, please sign the petition page showing support for FIT/CLEAN Program at Thank you.

Remember that we are discussing this topic, Solar Water Heater-How It Works, in honor of Ed Begley Jr.. The use of solar water heaters to heat water had a long history in countries/regions where sunlight is readily available.  As a matter of fact, in US, the first solar water heater dates back to 1890s.  By 1920, tens of thousands of solar water heaters were sold in US. However, the use of solar water heaters dwindled once the cheaper fossil fuels became available.  Yes, that was a different time in history and solar water heaters have again made a comeback in US and elsewhere  now that the cost of fossil fuel has gone up. Let’s look at some data/pie chart from 2007 at right   (click on the pie chart would give you a higher resolution view).

new solar hot water installations during 2007

There are mainly two types of solar water heaters:

  1. Active solar water heating systems: where pumps enable the flow of water through the solar water heating systems.
  2. Passive solar water heating systems: where most of the circulation of water occurs naturally, therefore no pump is use

(A) Passive CHS (Convection Heat Storage/thermosiphon)system with tank above collector. (B) Active system with pump and controller driven by a photovoltaic panel

Active systems can tolerate higher water temperatures than in equivalent passive systems, but active systems are often more efficient, more complex, more expensive, and more difficult to install than passive systems and rely on either mains or PV sourced electricity to run the pump and controller.

Since no body ever remembers a long winded speech (as Dale Carnegie once commented)….so let’s keep this one short also.

More of the solar water heater will be discussed in my next post. Stay tuned in at the same bat channel,

Until then, I bid you well~

sunisthefuture-Susan Sun Nunamaker


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