Tag Archives: evacuated tubes

Did not see the contract is put a solar water heater owners eat Yaba Kui

\"This is the developer of the mandatory installation of solar water heaters, want me to dig more than 6000 dollars, it is quite unreasonable for it.\" Mr. Han said he previously bought solar water heater, or three thousand dollars is enough.

Bought a new house, the developer also installed a solar water heater uniform, sounds like a good thing, but Mr. Han, who lives Jiubao Kim Nga Court, but it is full of complaints.

\"This is the developer of the mandatory installation of solar water heaters, want me to dig more than 6000 dollars, it is quite unreasonable for it.\" Mr. Han said he previously bought solar water heater, or three thousand dollars is enough.

When submitted to a water heater more developers received 6,000 yuan

Golden Villas is an affordable housing, the delivery end of December 2010. Mr. Han\\ s new home in Room 901, 7 a unit.

\"Submitted, I discovered how much a home on the balcony of a solar water heater, began to think that the developer sent, quite happy.\" Mr. Han said.

But I did not expect, then the developer said the price of solar water heaters is 6703 yuan, 4,000 yuan also returned to Mr. Han.

Mr. Han This think of it, his signing the purchase contract, that there is a clause: \"This contract involves the price of solar water heaters to the actual price when submitted to settlement, Duotuishaobu.\" Mr. Han was no care, signed the contract, but also to pay 10,000 yuan of book section.

\"At the time, developers, and we say that the water heater is not how much money, did not say money is the water heater money order, now we have more than 6000 pieces is how ah?\" Mr. Han a little excited, \"Besides, our previous as long as more than 2,000 pieces, this how expensive? \"He felt very unreasonable.

A total of 124 residential households install a solar water heater

Mr. Han lived in a total of seven two units, a total of 15 layers. Unit 1 started up from the fourth floor, the balcony of each household are united on the solar water heater installed, but only 4 people Unit 2, installed solar water heaters. District where the total installed 124 solar water heaters.

This is different from the one seen in the solar water heater , but the metal plate solar water heater, water tank installed in the balcony wall, the metal plate about 2 meters in length, mounted on the balcony railing.

Residential property management at Huatai Director Xu said that the developer originally planned to allow more households install solar water heater panel, but there may be some owners do not want to, so much left now.

\"For the solar water heater problems, reflecting the large one of the owners.\" Director Xu said, often have to find the property owners, reflecting the quality of solar energy and installation location problems.

Energy saving pilot project is below market prices

Owners of solar water heaters for the question, the reporter contacted the real estate developer Golden Harvest Zhang Gong. King Nga Court, as the project leader, said Zhang Gong, King Nga Court, a government pilot project to promote energy conservation, so the combination of solar energy and high-rise buildings.

This district, in part, low-income families purchase Yaohao, some of it is a special space, developers plan low-income families do not have the original installation, special space is to be installed. But when many households are the owners of buildings of special opposition, did not sign a specific contract, so in the end there is no mandatory installation of solar water heaters.

However, Mr. Han, Unit 1, where the 7, 8 and 10 in the contract, the provision is included regarding the installation of solar water heater, it must be installed in accordance with the contract.

Said Zhang Gong, are also generated through public tender, according to comparative tests, including lighting and safety performance, and finally chose one, count the total 6703 yuan installation fee. \"Because we are more the number, so the cheaper the price has been considered.\" Zhang Gong said.

Correspondent online survey after a moment, the market price of such metal plate heater 8000 yuan to 10,000 yuan in between, do vacuum tube solar water heater than a lot more expensive.

Do not see the terms of a contract are free to license to each other

For the case of Mr. Han, the reporter also consulted the law firm of Zhejiang Wang Jianjun Lv Xiaojun lawyer. He said, because the purchase contract on which a provision of solar water heaters, water heaters, so Mr. Han is now unable to return, only recognized, legal channels also could not walk.

\"Because the terms of the contract is open, both sides should be for the details of the terms are very clear, once the buyer signed, to authorize the developer to install, even if it took more than 20,000 yuan have to accept.\" Lu lawyers advise In signing the purchase contract, the buyer can not be easily delegated to the seller, have to restrict the rights of the seller, the price is the major licensed content. If there is another facility with the two sides must be expressly agreed price range.

\"Contract negotiations between the two sides settle down, so the terms for each item, the buyer should look at, certainly if he can accept, not groggy.\" Lu said the lawyer.

Zhang Gong said, in fact, affordable housing provision is generally not applied, but in the acquisition of real estate will often happen, for example, can be integrated installation floor, air-conditioning, washing machine or TV set eventually to contract about the main Therefore, the purchase contract, the owner must look at the signature of each money order, so as not to damage their own interests.
 

All-glass features

    A vacuum tube introduced

    (1) vacuum structure: all-glass vacuum tube solar collector is the core component is the engine of the entire solar system, its performance determines the merits of the whole system was thermal performance and longevity.

Schematic diagram of the all-glass vacuum tube

    All-glass vacuum tube one end of the opening, the inner tube and outer tube of the nozzle to melt sealing ring; the other side were closed into hemispherical head, inside the glass tube with a spring support bracket on the outside glass to buffer thermal expansion shrinkage caused by stress. Including glass and laminated between the outer glass tube into a high vacuum pumping. The end of the outer tube to protect the general bonding a metal cap to protect the vacuum after the closure of the exhaust nozzle. The appearance of glass topcoat selective absorbing coating. Spring bracket is equipped with a cool down agent, it is used in evapotranspiration after the vacuum tube to absorb the gas generated at run time, to keep the tube from the vacuum effect.

    (2) Tube Material requirements: 3.3 borosilicate glass vacuum tube used (iron oxide content of below 5%; thermal stability; low coefficient of thermal expansion, as 3.3 × 10-6 / ?; thermal shock resistance, heat resistance temperature is greater than 200 ?; have high mechanical strength; good resistance to chemical corrosion; has good optical properties, transmittance ≥ 0.89).

    (3) vacuum tube technology requirements:

    ? material is borosilicate glass, 3.3;

    ? air drying performance parameters y ≥ 175m2 ? / kW (when the solar irradiance G ≥ 800W / m2, the ambient temperature t at between 8 ~ 30 ?)

    ? nausea drying temperature increased to 35 ? required amount of solar radiation exposure ≤ 3.8MJ / m2 (when the solar irradiance G ≥ 800W / m2, the ambient temperature t at between 8 ? ~ 30 ?)

    ? average heat loss coefficient ≤ 0.9W / m2 · ?

    ? vacuum ≤ 5 × 10-2Pa;

    ? should be able to withstand the thermal shock of cold water below 25 ? and 90 ? above the impact of hot water alternately repeated 3 times without damage;

    ? pressure should be able to withstand the impact of the pressure of 0.6MPa;

    ? hail requirements should be not more than 25mm in the radial size of the hail damage is not under attack.

    (4) vacuum tube specifications.

    Second, the vacuum

    Solar water heaters is the use of the greenhouse theory, the solar energy into heat energy, in order to achieve the purpose of heating the entire package of water, usually by the solar collectors, storage tanks, brackets, a combination of controllers and other accessories, if necessary, to increase aid heat source.

    (1) how it works:

    Solar hot water heater is a light converter, different from the traditional use of nature, such as drying, lighting. Vacuum tube solar water heater is the core of his elongated structure as a thermos bottle lamps, a vacuum between the inner and outer layers. On the surface, including glass coated with a special process using spectral selective absorbing coating, to maximize absorption of solar radiation. By sunlight, photon hits the coating, solar energy into heat energy, water absorbs heat from the outside coating, water temperature, density decreases, the upward movement of hot water, while the proportion of cold water down. Hot water is always located in the upper part of the tank. Also hot water heating solar water heater in case the temperature has little to do with the outside world, depending on the light. When you open a kitchen or bathroom faucet any time, the hot water heater will depend on the natural fall out, the greater the gap, the higher the water pressure.

    (2) solar water heater structure

    (3) solar hot water system plans

    Third, all-glass vacuum tube solar collector

    (1) all-glass vacuum tube solar collector operating principle

    (2) all-glass vacuum tube collectors, the basic structure

    Number of branch tubes are arranged according to certain rules of the union of vacuum tube arrays with the tube (or Header), tail bracket and reflectors and other components together to form a vacuum tube collectors.

    All-glass vacuum tube collectors are generally associated box round and square, the use of stainless steel production, collector piping joints welded at both ends in the United box. Side or both sides of the joint box according to the design of the vacuum space hole, directly into the open end of tube joint box, tube and between the United box sealed by silicon rubber seals.

    In order to improve the performance of vacuum tube collectors, some of the manufacturers of products in the back of the addition of vacuum tube array reflector, mostly flat diffuser, generally aluminum or painted flat white paint is made. Because the reflector long-term exposure to air, easy to accumulate dust and dirt, require frequent cleaning, or reflections will be affected, and the collector reflector increases drag and affect the stability of collector installed, so the sand relatively large areas should not be installed with a reflector plate collector.
  

All-glass vacuum tube solar collector structure diagram
   

    According to the different vacuum tube installation, all-glass vacuum tube collectors can be divided into vertical alignment (north-south) and horizontally (east-west) two order forms, of which there are arranged horizontally level of single-row and two kinds of double standards the form.

    (A) vertical arrangement of all-glass vacuum tube solar collector

    (A) levels arranged in all-glass vacuum tube collector (double)

    All-glass vacuum tube solar collector arrangement diagram
   

    (3) application

    As the vacuum tube collector has a simple structure, excellent performance, advanced production technology and reliable, especially for large-scale mass production characteristics, so since its inception, in just a few years it has been considerable development. However, due to pipe the water to go in the running if a damaged, the entire system will stop working; and a larger heat capacity of the vacuum tube, vacuum tube solar water should be heated to the output of hot water, and the evening, vacuum tube the hot water will not be fully utilized, resulting in a certain amount of heat loss. Vacuum tube collector can not be used in pressure systems, generally open only for centralized s. Products can not be used for the balcony wall.