1. I want to test your products before place an order. Could you provide samples and how could I get them?
We can provide charged samples; We don't offer free samples to our customers at the first transaction. The sample will be sent out only when we received your payment by T/T. As to the samples prices and their Express freight charges. Please contact us in detail or calculate by yourself.
2 About price: could I get your pricelist?
Yes, please tell us the product's name(with its Item number)and quantity you are interested in, then we will offer the corresponding price information by e-mail.
3 About the shipment: what kind of shipment will you use?
For small products sample order or trial order, We usually send the products by air. If for bulk order, we suggest you ship by sea.
By Air: Small Solar Products without glass tubes, becuase it is easily broken
By Sea: For Vacuum Tube Solar Series, we pack them by Iron and Wooden Boxes.
4 About payment: what terms of payment do you use?
We accept T/T for sample order and trial order , L/C at sight for big order(More than USD100000) or 50% deposit and balance on/before delivery.
5 About warranty: how long for warranty? Do you have the service center to repair when broken or damaged?
Usually 1 year for the Solar Power System, 3 years for solar water system of the main part, 1 year for electric part of all system. It depends on different products. We can replace unqualified products/defective products with new good ones on following order after receiving buyer's unqualified products.
You can go to our agent service center to make any replacement or repair work. You can replace the broken part there.
We are searching agent worldwide, if you want to be our agent, please contact us.
6 About OEM: could we place order by OEM style to produce our own brand products in China?
Of course, you are welcome to place order with us this style.For solar power lights,it is 1000pieces. For solar water system, it is more than 50 sets. You can contact us if you have such request.
7 I am very interested in other products produced in China. Can you help me to search them?
Yes. It's our pleasure to help you to search for the products you wished. Just tell us the detailed information of the products. The rest work will be finished by our staff at shortest time. Inquiry to any product is welcomed.
|
8. What is a solar water heater?
|
A solar water heater is a technical device which uses the energy from the sun for heating water. The amount of energy normally necessary for heating water is reduced, thus the emission of green house gasses is reduced. By using a solar water heater, the environment is spared.
Although different types of solar water heater exist, they all are based on the same basic principle. A black body absorbs the daylight and passes the absorbed heat on a liquid (in a storage tank).
Solar water heaters—also called solar domestic hot water systems—can be a cost-effective way to generate hot water for your home. They can be used in any climate, and the fuel they use—sunshine—is free.
|
| 9. For which application can I use a Solar Water Heater? |
Solar Water Heaters can be used to provide hot water for domestic or other uses, like pool heating and large industrial applications or space heating in cold climates with sunny days and district heating.
|
| 10. What are the different types of solar water heaters? |
Although local conditions and traditions influence the market, it is possible to identify common types of solar water heaters.
In most places where the weather is good, people use vucuum tube Solar Water Heaters. A vacuum tube solar water system has a tank mounted above the collector (normally on the roof) to provide a natural gravity flow of water. Hot water rises through piping in the collector, heavier cold water sinks to the lowest point in the system (the collector), displacing the lighter hot water which rises to the tank.
In the places which have cold winter, people use heat pipe domestic Solar Water Heaters which consist of a collector (area 3-6 m2), a storage tank (volume 100-300 litres), circulating pump and automatic controller, a pressurised collector loop, in some regions freeze-protected with glycol in the heat pipe to match daily hot water consumption. Most of them also connect solar water heating system with other auxiliary heating system such as electric heater, gas heater or a stove.
Both systems circulate water through one or more collectors and exchange heat with water in a tank. The solar collector is the main component of the solar system. It is usually several all glass vacuum coated tubes mounted in a metal frame, that collects solar radiation and heats the water. The circulating pump is regulated by an electronic controller.
If the water in the solar tank is not warm enough, an auxiliary heater will heat the water to the required level.
|
| 11.How do a solar water heating system work? |
Solar water heating systems include storage tanks and solar collectors. There are two types of solar water heating systems: active, which have circulating pumps and controls, and passive, which don't.
Most solar water heaters require a well-insulated storage tank. Solar storage tanks have an additional outlet and inlet connected to and from the collector. In two-tank systems, the solar water heater preheats water before it enters the conventional water heater. In one-tank systems, the back-up heater is combined with the solar storage in one tank.
|
| 12. Heat pipe tube solar collectors |
They feature parallel rows of transparent glass tubes. Each tube contains a glass outer tube and metal absorber tube attached to a fin. The fin's coating absorbs solar energy but inhibits radiative heat loss.
|
| 13. Active solar water heating systems |
Direct circulation systems
Pumps circulate household water through the collectors and into the home. They work well in climates where it rarely freezes.
Indirect circulation systems
Pumps circulate a non-freezing, heat-transfer fluid through the collectors and a heat exchanger. This heats the water that then flows into the home. They are popular in climates prone to freezing temperatures.
|
| 14. Passive solar water heating systems |
Passive solar water heating systems are typically less expensive than active systems, but they're usually not as efficient. However, passive systems can be more reliable and may last longer. There are two basic types of passive systems:
Integral collector-storage passive systems
These work best in areas where temperatures rarely fall below freezing. They also work well in households with significant daytime and evening hot-water needs.
Thermosyphon systems
Water flows through the system when warm water rises as cooler water sinks. The collector must be installed below the storage tank so that warm water will rise into the tank. These systems are reliable, but contractors must pay careful attention to the roof design because of the heavy storage tank. They are usually more expensive than integral collector-storage passive systems.
|
| 15. How to work in cloudy days?—back up system connected |
Solar water heating systems almost always require a backup system for cloudy days and times of increased demand. Conventional storage water heaters usually provide backup and may already be part of the solar system package. A backup system may also be part of the solar collector, such as rooftop tanks with thermosyphon systems. Since an integral-collector storage system already stores hot water in addition to collecting solar heat, it may be packaged with a demand (tankless or instantaneous) water heater for backup.
To provide hot water on cloudy days or when demand exceeds supply, most solar water heaters come with a gas or electric booster.
|
|
|
16. Is Solar Hot Water System a good investment for me?
The potential savings on water heating bills are affected the most by the type of fuel you are using to heat that water and the number of people in your home. If you are heating hot water for two or more people and you heat water with electricity or with natural gas, then you owe it to yourself to look at solar water system, it could be a great investment for you.
17. What about the pay-back period of the investment on Solar Water System?
When you purchase a more efficient refrigerator, the decision to buy comes not from how long the savings generated will pay you back for your initial investment, but it comes from getting better service for a lower operating cost with a better rate of return. Solar water systems do just that. They provide quality hot water at a lower cost than heating with electricity or Natural gas.
It is important to remember that hot water is a constant daily expense; other large household appliances, like air conditioners and heaters, are seasonal expenses. Depending on you location (solar activity) and current hot water usage the annual electricity or gas saving will differ. However in a normal household that spends 20% to 30% of its electricity bill on hot water heating. Roughly speaking, a four person household needs 2 to 3 m2 solar collector to meet the hot water requirement, and 1 m2 aperture area of the solar collector will help save electricity 600 kWh and natural gas 80 m3 annually, with your electricity and natural gas cost per unit annual savings from solar water system can be worked out. In Beijing, the full cost of the purchase a Solar Water System may be recovered as quickly as 5 years. A solar collector should provide reliable operation for at least 15 years, and then you will definitely make considerable savings during the life of the solar hot water heater.
18. Is a Solar Water System safe?
Yes. The majority of solar collector's components are stainless steel, aluminum, polyurethane and free from electricity, so evacuated tube solar collectors are therefore eliminated fire risk and dangers related to electricity.
19. Can Solar Water System be installed anywhere?
Yes, SWH and SWH-C series can be installed on flat and sloped roof, VTSC, UPSC and HPSC series (solar water system with seperated storage tank) can be installed on flat and sloped roof, facade, and open ground.
There should be:
- No shading;
- South orientation of the collectors;
- Collector Tilt = Latitude of your location + 10°;
20. Does Solar Water System generate hot water all seasons of the year?
It generates hot water on: -Clear sunny day (Max.), - Partially cloudy day: Moderate, - Rainy or heavily overcast day -Nil;
Average 300 days in a year you will get hot water from you soar water system.
21. What about the rest bad solar radiation days?
For SWH and SWH-C series solar water heater, auxiliary electric heater is available;
For VTSC and HPSC series solar water heater, the back-up heating system is up to you, it can be electric heater or the boilers run on oil, gas, wood or even coal. No matter what is your choice, it must be well combined with the solar storage tank.
22. Can SolarSolutions Solar Water System operates in frozen areas?
Yes. SWH-C series solar water heater can be used in areas with temperature as low as -30℃; in continuous cloudy days, electric heater should be used to keep the water hot/warm. HPSC series with heat pipes and UPSC series with U tubes operate normally in -40℃.
23. Does Solar Water System generate high temperature water?
Yes, the system can be designed to give you an average output temperature as high as 60-85℃. If you consider that when having a shower the water temperature is usually around 32-43℃, and scalding can occur at 54℃, this temperature output is more than sufficient. In fact in some countries you may have to fit a thermostatic tempering valve to your house plumbing to conform to government health and safety regulations. This valve will temper water down to between 43 and 50℃.
24. How much money shall be spent on maintenance?
Maintenance is minimal for the system. Only Periodic glass tubes cleaning and the check for leakages and valve functioning are necessary. If one of the tubes is broken, it is also fairly inexpensive and easy to be replaced. Turn to your local distributor he will stock spare tubes. HPSC series and UPSC series solar water system can operate with several broken tubes, but the efficiency will be negatively affected, so it is recommended that broken tubes be replaced immediately.
25. Can SolarSolutions Solar Water System be used for a large-scale hot water production?
Yes. Solar collectors can be connected in series or parallel to provide large scale hot water production for commercial settings such as a school, hotel, office building etc. There is really no limit to the size of the system! For large scale hot water production, SolarSolutions VTSC series is recommended for its cost-effectiveness.
26. Are all-glass evacuated tubular collectors more efficient than flat plate collectors?
On average, yes. Evacuated tubular collectors are superior to flat plate collectors in a number of ways:
1. Due to the cylindrical shape of the evacuated tube, the sun is perpendicular to the surface of the glass for most of the day. Flat plate collectors have the disadvantage that the sun is only perpendicular to the collector at noon and thus a proportion of the sunlight striking the surface of the collector is likely to be reflected.
2. As the name suggests, air is evacuated from the evacuated tube to form a vacuum. This greatly reduces conductive and convective heat loss from the interior of the tube. As a result wind and cold temperatures have minimal effect on the efficiency of the evacuated tubular collector.
3. All-glass evacuated tubular collectors can be used in subzero temperatures without the system sustaining damage. Flat plate systems often require expensive and complicated "antifreeze" systems to be installed.
4. Evacuated Tubes are strong, long lasting, and should one be broken, inexpensive and easy to replace.
5. Due to the high efficiency absorption of solar radiation even during overcast conditions, combined with excellent insulation properties of the tube, evacuated tube collectors will heat water all year round (back-up heating system required for particularly overcast or rainy weather).
6. Due to the various advantages of evacuated tube collector over flat plate collectors, a smaller collector can be used to provide the same heating performance. For example, a standard household of 4-5 people would usually require a 200-250L water storage tank. Depending on your location, only 2-3 m2 of aperture area would be required to efficiently heat this volume of water.
7. Flat plate solar collector can produce similar heat output to evacuated tubular collector, but generally only during warm, still, sunny conditions. When averaged over an entire year, evacuated tube collector heat output per net m2 of collector area, is superior to flat plate.
|
