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Views: 12 Author: Site Editor Publish Time: 2019-10-21 Origin: Site
Whether you are obsessed with how to choose a residential solar water heater and see this article, I would like to say that it is absolutely correct to choose a residential solar water heater, because solar energy can be said to be the most energy-saving. According to surveys, residential residential solar water heaters can save $500 a year. Understanding the knowledge of solar energy can be said to be the first step in choosing solar energy. This article aims to explain the knowledge and choices about residential residential solar water heaters.
This article contains the following points:
How does a residential residential solar water heater work
Dimension of residential residential solar water heater
Tips for selecting a residential residential solar water heater
The most basic residential solar water heaters are just ferrous metal containers, such as buckets or barrels, placed in the sun. The water fills them, absorbs the heat of the sun, and then travels through the pipes to the home's hot water system.
Modern solar water heaters use the same basic principles, but include complex pump systems, storage vessels, and collection devices to maximize the use of solar energy to transfer water, hot water, and retained energy. Almost all of the circulating hot water enters the existing conventional tank-type water heater, which has a secondary heat source that reduces the energy load required to maintain hot water. Traditional water heaters support residential solar water heaters during cloudy weather and increased demand.
One of the most important steps in buying a residential solar water heater is to make sure it is sized to fit your hot water needs. If it is too big, you will waste a system that requires more hot water than you need. If it is too small, you can use a spare heater powered by natural gas, electricity or propane to save extra money. The right size and number of collectors, tank sizes and overall system types for your hot water needs will result in smaller, more resource-efficient and cost-effective systems.
Plate collectors range in size from 20 to 48 square feet and weigh up to 80 to 150 pounds. Sizes range from 3 x 6 feet to 4 x 10 feet and are 3 inches thick. The size of the vacuum tube collector depends on the number of tubes used. A 20-tube collector (about 6 x 7 feet in size) provides enough hot water for one to three people. They weigh more than the flat collector.
For fast residential system estimates, the general rule of thumb is that your south-facing roof/surface requires at least 20 square feet of collection area for the first two people in the home. For each additional person using hot water, add at least 12 to 14 square feet. Using these guidelines, the collector requires a 52 square foot south facing roof or other surface area that provides 100% hot water for three people. Water conservation and the installation of water-saving devices and equipment can reduce the size of the collector and the entire system required.
Some companies sell single-tank solar water heating systems (storage tanks store solar-heated water and use it as a backup), but most building owners use existing water heaters as backup power sources and purchase new solar hot water storage tanks.
The rule of thumb for tank size is based on an average of 20 gallons of hot water per person per day.
1. Determine if your site is suitable. Most solar hot water systems are installed on the roof. For the best results, your roof should:
Direct sunlight is available between 10am and 4pm throughout the year.
South (within 15°)
The body is strong and the slats are in good condition.
If your roof is not suitable for residential solar water heaters, but you have suitable unshaded land next to your house, you may want to consider a ground-mounted system instead.
2. Decide which type of system will meet your needs and lifestyle. The solar water heater contractor will help you determine which type and size of system is best for your needs. Take the following steps to have an informed discussion with the contractor during the procurement process:
Use the product list to find qualified models for consideration.
Understanding how solar water heaters work So you can discuss which collector type and circulation system is most meaningful to you.
Prevent freezing in cold climates. Some solar systems are suitable for cold climates, while others are not. In general, if the temperature drops to a temperature below 42 degrees Fahrenheit, choose a closed loop system with antifreeze as the heat transfer fluid, or a system that automatically discharges when the temperature drops too low to be comfortable. If you live in a climate with a distinct winter, don't use a batch system. Learn more about cryoprotection.
Estimate the capacity you need. Take the gallon capacity of your current water heater as a starting point. You can find the capacity or volume of the current water heater on its nameplate or on the yellow energy guide label. This will help you discuss the size of your solar system with the contractor. If you have recently added or plan to add more occupants to your home or a new shower, tap, dishwasher or washing machine will be used frequently, take this into account in your discussion.
3. Contact the solar contractor or manufacturer. Ideally, you'll find a local contractor who can evaluate your site, provide advice, install the system, and then perform regular maintenance. Installing a residential solar water heater in an existing home requires careful installation, which usually involves running the pipe through the wall. Use by the North American Energy Practitioners Accreditation Board (NABCEP) (links are external) if possible. When selecting a contractor, you should also:
The cost estimate is requested in writing.
Ask the referee.
Check the company with a better local business bureau.
Whether the company will obtain a local permit and understand the local residential building code and other regulations if necessary.
4. Don't forget to maintain. After installing the solar system, regular maintenance must be performed to ensure efficient operation. In addition to hiring qualified contractors for annual maintenance inspections, you should also check the following regularly:
On the roof or on the ground, depending on the installation:
The collector is clean and has no shadows.
The collector sounds good, sealing and glazing without cracking or yellowing.
The fasteners that connect the collector to the roof are strong.
The pipes and wires are well connected, and the insulation is good and there is no damage.
The roof penetration is sealed.
at home:
Pressure relief valve not fully open or closed
When the sun shines, the pump (in the active system) starts.
The pipeline has no mineral deposits.
If you live in an area with hard water, you may need to add detergent to the water every few years. For example, you can run a vinegar solution once every three to five years through a collector or hot water cycle.
Choosing a residential residential solar water heater is not a random matter. After all, this is related to the feeling of use in the future. If you choose more before choosing, the choice will be closer to your own needs, and you will have a better experience when you use it.
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