As we all know, solar collectors pay attention to efficiency. We offer high performance solar collectors that generate heat at temperatures up to 302dF with outstanding performance. We can design solutions for large hot water users. We offer OEMs, this is a very interesting product, our goal is to sell high quality products and services only at reasonable prices.

Flat panel collectors are the most common solar thermal technology. They include an outer casing containing a dark absorbing plate with fluid circulation channels, and a transparent cover to allow solar energy to be transferred into the outer casing. The sides and back of the enclosure are typically insulated to reduce heat loss from outside air. The fluid circulates through the fluid passage of the absorber to remove heat from the solar collector.

solar thermal colector rooftop
solar thermal colector rooftop

How does the solar thermal collector work?

Passive Active Difference
Passive solar space heating occurs when the sun shines through the windows of buildings and warms the room. Building designs that optimize passive solar heating usually have south-facing windows that allow the sun to shine on solar heat-absorbing walls or floors in winter. Solar energy heats buildings through natural radiation and convection. In summer, windows hang or block the sun from entering windows to keep buildings cool.
Active solar heating systems use collectors and fluids that absorb solar radiation. Fans or pumps circulate air or endothermic liquids through collectors and then transfer the heated fluids directly to the room or heat storage system. Active solar hot water systems usually have tanks for storing solar hot water.

Solar collectors can be either passive or active. By definition, passive systems do not depend on external energy to function, but use natural convection to transfer heat, which occurs at different temperatures in the fluid.
More realistically, this means that hot water rises as sunlight is collected and heat is absorbed. We now have natural movement or water flow.
Other common uses of passive solar systems include geysers or foam pumps, space heating, solar cookers and solar chimneys. There are two types of passive solar collectors on the market:
As you can guess, active solar technology does use external energy to operate, usually pumps and valves that handle heat transfer.
Solar collectors are usually divided into low, medium or high temperatures.

Solar water heater or solar collector type

Spoiler Cryogenic glazed collector

The collector is mainly used for heating the swimming pool. It consists of a black mat or a tube made of rubber or plastic materials through which the pool water circulates. Under warm sunshine, the panels can heat large amounts of water with a small temperature rise (suitable for swimming pools). In hot sunny areas, such panels are also used for domestic hot water supply.
Because this type of collector is not insulated, it cannot be operated effectively under colder conditions or when hot water (shower temperature) is required.

Spoiler Flat plate collector

Flat plate collectors are the most common and widely used solar water heaters.
A collector for domestic hot water applications. The design is very simple. It is an insulating box. Its absorption plate is welded on the copper tube, and the heat transfer liquid circulates through it.
Although the basic design concepts are quite consistent among manufacturers, there are differences in design, which can improve performance, make the panel lighter, easier to install and adapt to different installation forms, and ultimately affect cost, efficiency and service life.
Flat plate collectors perform well in warm climates and at operating temperatures of basic domestic hot water (<60 o C/140 o F). The absence of insulation above the absorber is an inherent defect of the design and leads to high heat loss. This loss of heat means that the plate can not provide heat effectively at high temperature (> 70 o C/160 o F), and its performance will be greatly reduced in cold weather.

Spoiler Concentrating Collectors

In steam production, concentrator is usually used.
Concentrator collectors use mirrors to concentrate sunlight on absorption tubes or panels, allowing for higher temperatures. Such collectors usually require 1 or 2-axis tracking to track the sun and ensure optimal reflection angles. Because of the size and complexity of these systems, they are mainly used for large-scale projects.

Spoiler Vacuum tube collector

Vacuum tubes consist of a series of single-wall or double-wall glass tubes, which have vacuum and can provide excellent thermal insulation. The design is very similar to a glass thermos bottle used to keep hot water.
Single-wall vacuum tubes usually have fins with absorbing coatings, similar to those used in flat collectors.
The double-wall vacuum tube has an absorbing coating on the inner tube, and the space between the two tubes is “evacuated” to form a vacuum.

Spoiler Flat Box Heat Absorber

Flat box heat absorbing plate is formed by pressing two metal plates separately and then welding them into one to form a heat absorbing plate. The material of heat absorbing plate can be stainless steel, aluminium alloy, galvanized steel, etc.
Defects of flat box heat absorber plate: difficult welding process, easy to penetrate or improper welding; poor pressure resistance, weld joint can not withstand higher pressure; poor dynamic characteristics, large cross section of flow channel, large heat capacity of heat absorber plate; sometimes water quality is not easy to guarantee, aluminum alloy and galvanized steel will be corroded.

How does a solar thermal collector work?

The main source of heat is the solar panels installed on the roof, which are used with boilers, collectors or immersion heaters. The solar collector will use solar light to heat the transfer fluid, usually a mixture of water and ethylene glycol (antifreeze), which prevents water freezing.

What is the function of solar collector?

Solar collectors heat air. Simple solar air collectors consist of absorbing materials, sometimes with selective surfaces, to capture radiation from the sun and transmit the heat to the air through conductive heat transfer.

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