1. Pay attention to thermal performance indicators
The higher the “average daily efficiency” the better, and the lower the “average heat loss coefficient” the better. If you need to set up an electric heater, you should choose a product with an electrical safety design.
Be careful when purchasing other related accessories, such as automatic water supply devices, water temperature and level indicators, solenoid valves, etc., and inquire you clearly about the lifespan and warranty period. Some functions may seem advanced. , but they have too many components, reliability is not high, and problems may arise over time.
2. The key part is the vacuum tube
The key part of the domestic solar water heater is the vacuum tube When purchasing, you should carefully observe the coating on the v-tubewanders. inside the vacuum tube. A good quality coating is uniform in color, has no scratches, peeling or peeling on the film, and there are no pebbles or knots on the glass. The brackets supporting the inner glass tube are placed correctly and are not loose.
At the same time, it should also be noted that the center distance between the two vacuum tubes should be approximately 70 mm. Currently, there are different forms of reflectors for domestic solar water heaters on the market. When purchasing, you should check whether the reflector design can make full use of the heat-absorbing surface of the vacuum tube and whether vacuum is present. The tube can receive maximum light.
3. The design of the bracket should be reasonable
For solar water heaters, the design of the bracket should be reasonable and should have sufficient strength and rigidity. In certain areas subject to windsstrong daily life, especially coastal areas, you should also pay attention to whether the product is designed with wind resistance.
4. Pay attention to the brand
Buy products with original standard accessories and pipelines as much as possible, and be careful when purchasing "semi-finished" solar water heaters. Try your best to choose brand products with good reputation, guaranteed product quality and after-sales service, and do not buy "three no's" products made by small workshops.
Detailed information
There are four major safety risks in solar water heaters
1. Lack of mandatory installation and fixing standards, solar water heaters fall and injure people.
Although the “Technical Conditions for Domestic Solar Water Heating Systems” does not have clear requirements regardingt specific levels of wind resistance, GB/T19141 only states that “the supports of the domestic solar water heating system shall have sufficient strength, rigidity and toughness. certain corrosion resistance."
However, there are no clear requirements for the specific selection of materials and surface anti-corrosion treatment of the support, and there is a lack of mandatory standards installation and fixing
2. The lack of mandatory standards for the material and installation of electric heating tapes has caused electricity leaks and fires in solar water heaters.
Due to the lack of mandatory standards for the material of electric heating tapes, the quality of electric heating tapes does not meet standards. At the same time, due to the lack of standards. installation and fixing for electric heating ribbons,The wiring of the electric heating tapes was improperly installed during installation and fires occurred during use.
3. There is a lack of mandatory standards for materials and installation of electric heating, and leaks from solar water heaters can harm people.
From the point of view of relevant standards for electric heating, there are no regulations on materials for electric heating. Material selection specifications. Missing. There are no standards regarding the service life of electric heating tubes made from different materials, nor regulations on relevant measures to be taken for electric heating tubes that have exceeded their safe service life.
4. There are no mandatory standards for inner tank material, process, pipe material and installation. Solar water heaters cannt escape and injure people and damage homes.
Due to the absence of mandatory standards for the selection of solar water heater pipe materials, the quality of the pipes is not up to par. Some use pipes that are not resistant to high temperatures and are prone to high temperatures. breakage and leakage after long-term use. At the same time, there is a lack of standards for the installation of solar water heater pipelines, resulting in inadequate installation of water supply and drainage pipelines. For example, in the northern regions there are no anti-freeze protection measures in winter and pipes are prone. to freeze cracks and leaks.
People's Daily Online - The success rate of domestic solar water heaters is 86%. You should pay attention to three aspects when purchasing.
The DailyPeople's Online - National standards for big four Safety risks of solar water heaters should be eliminated as soon as possible
How to install the upper and lower water pipes of heaters -solar water systems
"Technical specifications for the design, installation and technical acceptance of solar hot water systems" GB/T 18713—2002
" Selection and installation of solar water heaters" 06J908-6 "Technical specifications for the design, installation and technical acceptance of solar hot water systems" GB/T 18713-2002
"Specifications techniques for the installation, operation and maintenance of domestic solar hot water systems" 》NY/T 651—2002
《 On-site inspection and operational verification of domestic solar water heating systems 》ASTM E 1160—1987
《Domestic solar hot water for one- and two-family homes Installation and maintenanceequipment》ASTM E 1056-1985 “Test method for thermal performance of solar collectors” GB/T 4271—2007
“Flat solar collectors” GB/T 6424—2007
p >"Solar Thermal Terminology Use" GB/T 12936—2007
"Calibration methods for working pyranometers" GB/T 14890—1994
"Houses passive solar collectors" Thermal technical conditions and test methods》GB/T 15405—2006
“All-glass vacuum solar collectors” GB/T 17049—2005
“Passive solar collectors" vacuum tubes” GB/T 17581—2007
1. When laying pipes and installing valves, first look at the gas interface and water inlet and outlet interface at the installation location, and install the water valve cold water and the hot water valve directly. and cold on the right. When installing, be careful not to close the main water inlet valve and air inlet valve of your house. Only in this way can you avoid the phenoleads “with water flooding the golden mountain”.
2. Unpack the water heater packaging. Regardless of which channel you purchased the water heater from, you need to unpack it first to see if the accessories inside are complete. Of course, if you don't know much. regarding this, it is best to request an inspection by professional personnel. Additionally, you can also follow the accessories manufacturer's instructions. Books to count. Typically, there is an expansion coil, flue, elbow, and shower head. However, the configurations of different manufacturers may be different, so it is best to ask clearly.
3. Installation of the smoke evacuation pipe. This step consists of installing the smoke evacuation pipe. You should pay attention to it, otherwise it will pose a security threat for future use. Generally, the smoke extraction port is designed par the developer and the location is reserved. If there is none, then you must make an inclined opening yourself, high towards the inside and low towards the outside. In order to facilitate the adjustment of the water heater after hanging it on the wall, you must first install the flue pipe. You also need to pay attention to the metal material between the exhaust pipe and the wall, due to the temperature of the exhaust. The pipe is high when the water heater is used, and the plastic cover will be burned and even cause other hidden dangers.
4. Installing the gas valve. This step requires connecting the air inlet hose to the gas meter. Be sure to close the main air inlet valve before installation. Generally speaking, house gas should be supplied to both the stove and the water heater, so a three-way valve should be connected to the gas outlet of the gas meter. However, like the vanIf the angle valve is difficult to use, it is recommended to use a ball valve. Particular attention should be paid to the connecting pipes. Place rubber seals to prevent air leaks.
5. Preparing to drill the water heater before installing it on the wall. Measure the installation position of the water heater according to the position of the flue pipe and make a recording on the wall. drill to make the hole and press the plastic expansion tube and screws. Install the gas water heater on the wall and connect the pipes. Hang the hot water device on the wall and seal the flue pipe with aluminum foil. Then connect the water inlet pipe, water outlet pipe and gas pipe. prevent air and water leaks.
6. Test and inspect. After installation, check whether it can be used normally. The way to check for air leaks is to apply soapy water tothe connection.