Solar Hot Water - Professional Info
Table of Contents
Residential -Domestic Hot Water (DHW) and Hybrid/Hydronic ( radiant ) Heating
Commercial -Domestic Hot Water, High temperature Process Water, Hybrid/Hydronic heating, ice melt, solar assist for heating applications, solar assist for solar cooling.
Our collectors are OG-100 certified ( SRCC Rating Agency) for Federal tax credits and OG-300 certified for jurisdictions requiring ( Oregon, SW Washington (Clark County) and some cities). OG-300 certified systems provide the home or business owner a measurement of an expected level of performance based on testing and software modeling for many locations in all 50 States.
OG-100 performance data is used by modeling software as part of a full system design to arrive at expected energy generation for the system.
Residential -Standard residential systems for DHW have a basic design ( OG-300 Certification, identifies all components and provides projected performance for many locations – OG-300 required for Oregon). These systems have a combination of 80, 120 gal tanks, Flash heaters, one (1) or more collectors – they are essentially prepackaged/pre-engineered to perform.
Commercial -System prelim design and sizing with Polysun – detailed design available on a project basis.
With their rounded tubes and internal aluminum heat transfer fins the collector functions in passive solar tracking mode providing optimum collection of solar energy throughout the day and not just at Noon.
The sunlight passes through the first glass wall, through the vacuum and strikes the black absorber surface converting the light to energy – the metal fin inside the tube collects the heat, transfers the heat to the heat pipe. In cold weather, the dual walled vacuum tube construction dramatically reduces the heat lost to the atmosphere making them extreme efficient in cold weather.
The heat pipe has a drop of water in the bottom which is heated by the surrounding metal and converts the water to steam rising through the heat pipe to the copper bulb (heat pipe condenser) on top. The bulb, inserted in the manifold passes it’s heat through the manifold to the glycol/water mixture moving through it. In the process of giving up it’s heat the steam condenses and returns to the bottom of the heat pipe to begin the process all over again.
Each time the pump circulates the fluid through the collector the temperature of the glycol/water increases by 10-15 F degrees.
After the fluid leaves the collector it is returned to the heat exchanger in the solar storage tank where it heats up the water in the tank to be used as domestic hot water. The fluid in the heat exchanger is returned to the collector for reheating and the cycle begins all over again. (See Residential- Solar Hot Water in this website for more info)
Residential -Depending on location and efficiency of the system components ( primarily the heat exchanger) a single collector can provide 60 – 70 gallons of hot water daily in the Summer and generate up to 2,200 kWh ( Seattle), 2,200 – 2,400 kWh ( Willamette Valley), 2900 kWh ( Southern Oregon) and 3,100 kWh ( Eastern Oregon and Washington).
Commercial -Can be designed and engineered from 20 – 600 collectors in a system to meet a major portion of hot water needs for hotels, hospitals, military facilities, fitness centers/gyms and many high demand hot water facilities.
Residential -Premier National Incentive Database at http://www.dsireusa.org , click on your state to see incentives available at State, County and local levels for many different types of renewable energy.
A Federal Tax Credit of 30% is available, as well as up to $1,500 State of Oregon Tax Credit (DHW) and a space heating Tax Credit of $1,500 and Utility incentive up to $1,500.
Commercial -Commercial federal tax Credits of 30% and accelerated Depreciation are available. Detailed system design and review by controlling jurisdiction will determine tax credits and incentives granted the project.
Residential-Standard Residential systems up to 5 collectors can be easily modeled using Polysun Software.
Commercial-Detail models using Polysun can be developed to determine the number of collectors, size and number of storage tanks to meet the desired energy needs to be provided by solar hot water.
Solar Hot Water can provide a significant amount of energy to meet domestic hot water and home heating needs. This is especially true for new homes and those specifically designed to take advantage of active and passive solar. Combined with Solar Electric (PV), Wind Energy and geothermal heat pumps you can get you close to a Net Zero Energy home or facility.
We carry Apricus Evacuated Tube Collectors and Solar Hot Flat Plate Collectors with related pump stations, heat exchangers, controls and Marathon Lifetime warranty tanks.
Independent installers/dealers will meet with you to perform onsite solar analysis using equipment like the Solar Pathfinder to determine the suitability of your location for solar. This analysis helps determine acceptability of the site to meet government/utility requirements for tax credits/incentives.
Residential-Systems are sized with 1-2 collectors to provide for domestic hot water and generally 4-6 collectors for hydronic heating.
Commercial -Preliminary commercial system designs are sized based on required BTU’s of energy or % of building requirements based on an analysis by the owner/developer. Sizing is performed using Polysun modeling software.