Simple batch-style solar water heaters are relatively inexpensive and great for climates with little chance of freezing temperatures.
Got Comments or Questions? You want to do this even if you are only planning to do water heating and not space heating because: It will give you a better idea of how to build the project, and ideas for alternatives if you run into something that does not work in your situation.
Objectives for the System The objectives for this project are to design and build a domestic solar water heating system that: Has a long life with little maintenance Works well in a cold, 4 season climate.
Performs well, providing a high fraction of solar heated water for the full year. Is easy to build using commonly available materials. To accomplish the goals, the design uses these somewhat unique features: Two collector designs are covered -- either one can be used -- both are easy to build: The first collector design uses low cost PEX tubing instead of copper to pick up heat from aluminum fins.
The 2nd collector design uses a hybrid copper tube and aluminum fin combination.
The storage tank is non-pressurized, plywood box framed with 2 by lumber, and lined with EPDM rubber sheeting.
This design allows a large storage tank to handle several cloudy days, and is inexpensive and easy to build. The heat exchanger is a large coil of plastic pipe that is immersed in the storage tank.
The coil itself stores enough water 9 gallons to satisfy most hot water demands, so performance loss due to the heat exchanger is usually zero.
The system is very simple, consisting of only: The low part count and the simplicity of the part designs reduces cost and makes the system easier to build, understand, and maintain.
Both the collector and the storage tank can be oversized for very little extra cost -- this provides improved winter performance for a better year round solar fraction. The pump P pumps water from the bottom of the large storage tank, up through the collector to be heated, and then back to the top of the storage tank.
Incoming cold water from the street passes through the large pipe coil immersed in the storage tank and is heated by the hot storage tank water before it gets to your existing hot water tank which provides backup heating when needed. The three valves provide for bypassing and isolating the solar tank for maintenance.
There is a controller not shown in the diagram that turns the pump on only when the collector is hotter than the storage tank water -- this is an off the shelf item.
Our system uses both more collector area and more storage area than "normal" commercial systems use. This should improve winter performance and result in a higher year round solar fraction.
Since you are building the collector and tank, the added materials cost and effort to oversize these elements is minimal.Solar Water Heating--Revised & Expanded Edition: A Comprehensive Guide to Solar Water and Space Heating Systems (Mother Earth News Wiser Living Series) [Bob Ramlow, Benjamin Nusz] on iridis-photo-restoration.com *FREE* shipping on qualifying offers.
Heating water with the sun is a practice almost as old as humankind itself. Solar Water Heating. Solar Water Heating Systems Solar Thermal Water Heating (also called domestic hot water) is a simple, reliable, and cost-effective technology that harnesses the sun's energy to provide for the hot water needs of homes and businesses.
For the do-it-yourselfer seeking an inexpensive, easy-to-build solar water-heating system, the integral passive solar water heater (IPSWH, pronounced ips-wah) is a dream come true.
Solar water heating (SWH) is the conversion of sunlight into heat for water heating using a solar thermal collector. A variety of configurations are available at varying cost to provide solutions in different climates and latitudes.
SWHs are widely used for residential and some industrial applications. Solar water heating systems almost always require a backup system for cloudy days and times of increased demand. Conventional storage water heaters usually provide backup and may already be part of the solar system package.
Detailed description and build instructions for a solar water heating system costing $ suitable for cold or warm climates.