Solar Collector Panel - Mounted on your roof, the collector captures the heat from the sun and transfers it to the liquid circulating through the panel. Sometimes this liquid is water, but it can also be a special type of fluid that eventually transfers the heat to your home's storage tank through a heat exchanger. See below.
Storage Tank - The heater storage tank is your home's current boiler/hot water heater. The heated water captured by the solar collector panel is stored in the tank for later use.
Heat Exchanger - The heat exchanger transfers the heat energy captured by the solar collector panel to the potable water that is stored in the heater tank. In our system, the heat exchanger is external to the solar storage tank.
Expansion Tank - The expansion tank ensures that the system's pressure does not exceed the pressure limits set by the system designer.
Control system - The control system consists of a controller and the circulating pump. The controller compares the temperature difference between the heat exchanger exit point and the solar collector's exit point. When the collector panel's temperature is higher than the heat exchanger temperature, the controller turns on the pump and circulates the liquid through the system until the temperature is equalized, and then turns the pump off.
Flat Plate Solar Collectors
The principal component of a flat plat solar collector is the absorber plate, which consists of an assembly of a copper sheet and copper tubing.
The top surface of the absorber plate is coated with either a dark colored material or with a selective absorbent coating that is designed to extract as much as 15% more heat for the same active area. The solar radiation that strikes this surface is converted to thermal energy that's used to heat the fluid flowing through the tubes.
To ensure extended service life, Free Hot Water collector parts are housed inside an anodized Aluminum case that's capable of withstanding many years of exposure to the elements. The components inside and the back of this enclosure are insulated in order to minimize potential heat loss.
The upper surface of the collector is covered with tempered glass with low iron oxide content. The glass is designed to withstand high thermal stress (heat from the sun!) as well as impact from hailstones.
Free Hot Water's Flat Plate Solar Collectors are high performance thermal collectors certified by the Solar Rating and Certification Corporation (SRCC) as OG-100, appropriate for large installations such as apartment buildings, hospitals, restaurants, retirement homes, and other businesses.
SRCC Collector Ratings
Any quality collector sold in the United States is examined and approved by what's commonly known as the SRCC, which stands for the "Solar Rating and Certification Corporation." States such as California will only issue rebates to collectors and complete systems that have been rated by the SRCC.
And who is the SRCC? The SRCC is an independent agency that administers a certification, rating, and labeling program for solar hot water collectors. They also have a similar program for complete residential solar water heating systems.
• Solar thermal collectors have what's known as an "OG-100″ certification. These can be used on any roof with a custom installation. Apartment buildings, hotels, laundry mats, car washes, and hospitals all require custom installations that include OG-100 panels.
• Complete solar water heating systems that include OG-100 solar collectors, storage tank, and other components have an "OG-300″ certification. Residential systems don't typically need custom engineering, which is why most residential systems are sold as complete SRCC rated kits.
All equipment that the SRCC certifies and rates is required to bear a certification label, which shows the performance rating for that product. In addition, each certified product is published by SRCC in a directory.
Each product's directory listing contains information on the product's material and specifications as well as the certified thermal performance rating. For example, our Free Hot Water 7000 and 5000 and 4000 series are all OG-100 certified.
See the label for our 7000 series specifications and how the collector performed on sunny days, cloudy days, and other specifications. You can then compare Free Hot Water solar collectors to other certificates from other brands and make apples to apples comparison of performance and the materials used to make the panels
Sizing Your Solar Water Heater Tank
The simple rule of thumb is that on average, you should consider 1.5 gal of hot water storage for every square foot of solar panel installed.
For example every FHW-FC7275 collector has 25.25 sq ft of active area (the "aperture area"). An average system with two FHW-FC7275 should have a 75 gal storage tank capacity.
Please note that this type of calculation is a rule of thumb and is only intended to give you a good "ball park" number. In reality, storage capacity should be calculated based on:
1. Heat production capacity of the solar array
2. Isolation
3. Water usage patterns
4. Desired water temperature
5. System type
Storage Tank - The heater storage tank is your home's current boiler/hot water heater. The heated water captured by the solar collector panel is stored in the tank for later use.
Heat Exchanger - The heat exchanger transfers the heat energy captured by the solar collector panel to the potable water that is stored in the heater tank. In our system, the heat exchanger is external to the solar storage tank.
Expansion Tank - The expansion tank ensures that the system's pressure does not exceed the pressure limits set by the system designer.
Control system - The control system consists of a controller and the circulating pump. The controller compares the temperature difference between the heat exchanger exit point and the solar collector's exit point. When the collector panel's temperature is higher than the heat exchanger temperature, the controller turns on the pump and circulates the liquid through the system until the temperature is equalized, and then turns the pump off.
Flat Plate Solar Collectors
The principal component of a flat plat solar collector is the absorber plate, which consists of an assembly of a copper sheet and copper tubing.
The top surface of the absorber plate is coated with either a dark colored material or with a selective absorbent coating that is designed to extract as much as 15% more heat for the same active area. The solar radiation that strikes this surface is converted to thermal energy that's used to heat the fluid flowing through the tubes.
To ensure extended service life, Free Hot Water collector parts are housed inside an anodized Aluminum case that's capable of withstanding many years of exposure to the elements. The components inside and the back of this enclosure are insulated in order to minimize potential heat loss.
The upper surface of the collector is covered with tempered glass with low iron oxide content. The glass is designed to withstand high thermal stress (heat from the sun!) as well as impact from hailstones.
Free Hot Water's Flat Plate Solar Collectors are high performance thermal collectors certified by the Solar Rating and Certification Corporation (SRCC) as OG-100, appropriate for large installations such as apartment buildings, hospitals, restaurants, retirement homes, and other businesses.
SRCC Collector Ratings
Any quality collector sold in the United States is examined and approved by what's commonly known as the SRCC, which stands for the "Solar Rating and Certification Corporation." States such as California will only issue rebates to collectors and complete systems that have been rated by the SRCC.
And who is the SRCC? The SRCC is an independent agency that administers a certification, rating, and labeling program for solar hot water collectors. They also have a similar program for complete residential solar water heating systems.
• Solar thermal collectors have what's known as an "OG-100″ certification. These can be used on any roof with a custom installation. Apartment buildings, hotels, laundry mats, car washes, and hospitals all require custom installations that include OG-100 panels.
• Complete solar water heating systems that include OG-100 solar collectors, storage tank, and other components have an "OG-300″ certification. Residential systems don't typically need custom engineering, which is why most residential systems are sold as complete SRCC rated kits.
All equipment that the SRCC certifies and rates is required to bear a certification label, which shows the performance rating for that product. In addition, each certified product is published by SRCC in a directory.
Each product's directory listing contains information on the product's material and specifications as well as the certified thermal performance rating. For example, our Free Hot Water 7000 and 5000 and 4000 series are all OG-100 certified.
See the label for our 7000 series specifications and how the collector performed on sunny days, cloudy days, and other specifications. You can then compare Free Hot Water solar collectors to other certificates from other brands and make apples to apples comparison of performance and the materials used to make the panels
Sizing Your Solar Water Heater Tank
The simple rule of thumb is that on average, you should consider 1.5 gal of hot water storage for every square foot of solar panel installed.
For example every FHW-FC7275 collector has 25.25 sq ft of active area (the "aperture area"). An average system with two FHW-FC7275 should have a 75 gal storage tank capacity.
Please note that this type of calculation is a rule of thumb and is only intended to give you a good "ball park" number. In reality, storage capacity should be calculated based on:
1. Heat production capacity of the solar array
2. Isolation
3. Water usage patterns
4. Desired water temperature
5. System type
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