CN203148065U - High-efficiency micro-channel flat-plate solar thermal collector - Google Patents

Abstract

The utility model is a high-efficiency micro-channel flat solar heat collector. Including glass cover plate, heat absorbing plate, frame, heat insulation layer, inlet and outlet pipes, bottom plate, glass cover plate is on the surface of the collector, heat absorbing plate is under the glass cover plate, and heat insulating layer is inside the collector frame , the bottom plate of the heat insulation layer is at the bottom, and it is characterized in that a microchannel heat exchanger is arranged between the bottom plate of the heat insulation layer and the glass cover plate, and the microchannel heat exchanger is connected to the water inlet and outlet pipes. The utility model has high light-to-heat conversion efficiency, good integrity, light weight, compact structure and convenient installation and maintenance; Thermally functional roof panel engineering. At the same time, since the area of the unit heat collector plate is greatly reduced, there is a higher degree of flexibility in the installation of the heat collector plate array.

Description

A high-efficiency microchannel flat solar collector

technical field

The utility model relates to a solar energy device, in particular to a high-efficiency micro-channel flat solar heat collector.

Background technique

The current solar collectors mainly use two methods, one is a flat plate solar collector, and the other is a vacuum tube solar collector. Flat plate collectors are generally used for solar water heaters and the like. Although the solar collector is not a terminal product directly facing consumers, the solar collector is a key component of various solar heat utilization systems.

Flat-plate solar collectors are mainly composed of heat-absorbing plates, transparent cover plates, heat-insulating layers, and shells. A water heater composed of a flat-plate solar collector is a flat-plate solar water heater. Flat-plate solar collector is one of the most basic types of solar collectors. It has the characteristics of simple structure, reliable operation, reasonable cost, strong pressure bearing capacity, and large heat absorption area. It is the best combination of solar energy and buildings. Select one of the collector types.

Existing flat solar heat collectors include several parts such as a cover plate, a heat absorbing plate, a frame, a heat insulation layer, and a bottom plate. The overall area of the heat collecting plate is large, nearly 2 square meters, and the weight is large, nearly 30kg. The area is large. With the increasing number of high-rise residential buildings today, the roof area is difficult to meet the solar energy demand of all residents in a building; it is used for balcony wall hanging, and the weight is heavy, which is extremely inconvenient for installation and maintenance.

Contents of the invention

The purpose of this utility model is to provide a high-efficiency micro-channel flat solar collector with high heat exchange efficiency and greatly reduced weight and area.

The high-efficiency micro-channel flat solar collector of the utility model includes a glass cover plate, a heat absorbing plate, a frame, a heat insulation layer, an inlet and an outlet pipe, and a bottom plate of the heat insulation layer. The glass cover plate is on the surface of the heat collector, and the glass cover The heat absorbing plate is under the plate, and the heat insulation layer is inside the collector frame, and the bottom plate of the heat insulation layer is at the bottom. Connect the water inlet and outlet pipes.

The parallel flow tube and the blue film plate of the microchannel heat exchanger of the high-efficiency microchannel flat solar heat collector of the utility model adopt an integrated welding method, and the low temperature welding is completed at one time, and the combination becomes the core heat collecting plate of the heat collector. the

The microchannel heat exchanger is a heat exchanger with a channel equivalent diameter of 1-1000 μm. There are dozens of fine flow channels in the flat tube of this heat exchanger, and the two ends of the flat tube are connected with the circular header.

The high-efficiency micro-channel flat solar heat collector of the utility model adopts the micro-channel heat exchanger, the overall heat exchange efficiency is improved, the weight and area of the heat exchanger are greatly reduced, the amount of metal materials is reduced, and the entire The area occupied by the collector. Under the premise of lightweight and miniaturized structure, the microchannel collector can meet pressure resistance, durability and system safety at the same time. Microchannels have the advantages of energy saving and outstanding heat transfer performance. Compared with conventional heat exchangers, microchannel heat exchangers are not only small in size but high in heat transfer coefficient and high in heat transfer efficiency, and can meet higher energy efficiency standards. The 0.8㎡ high-efficiency micro-channel flat-panel solar collector can produce about 90kg of hot water a day (based on the standard of 50 degrees Celsius, 60-90kg in winter and 90-120kg in summer), basically reaching the level of the current 2㎡ flat collector plate Excellent heat collection effect, small area, high thermal efficiency, light weight, easy installation and maintenance, suitable for installation in various locations such as floors, walls, balconies, etc. Since the area of the unit heat collector plate is greatly reduced, there is a higher degree of flexibility in the installation of the heat collector plate array. It meets the requirements of the era of building integration at this stage.

Description of drawings

Fig. 1 is a structural schematic diagram of a high-efficiency micro-channel flat solar heat collector of the present invention.

In the figure: 1 - glass cover plate, 2 - heat absorbing plate, 3 - microchannel heat exchanger, 4 - frame, 5 - heat insulation layer, 6 - water pipe, 7 - heat insulation layer bottom plate. the

Detailed ways

As shown in Figure 1, the high-efficiency microchannel flat solar collector of the present invention includes a glass cover plate 1, a heat absorbing plate 2, a frame 4, a heat insulation layer 5, an inlet and an outlet pipe 6, a heat insulation layer bottom plate 7, a glass The cover plate is on the surface of the collector, the heat absorbing plate is under the glass cover plate, the heat insulation layer is inside the collector frame, the bottom plate of the heat insulation layer is at the bottom, and there is a micro channel between the bottom plate of the heat insulation layer and the glass cover plate Heat exchanger, the micro-channel heat exchanger is connected to the water inlet and outlet pipes. The microchannel heat exchanger has a support plate with the insulation floor.

The microchannel heat exchanger is a heat exchanger with a channel equivalent diameter of 1-1000 μm. There are dozens of fine flow channels in the flat tube of this heat exchanger, and the two ends of the flat tube are connected with the circular header. The available materials for micro-microchannel heat exchangers are: polymethyl methacrylate, nickel, copper, stainless steel, ceramics, silicon, Si3N4 and aluminum.

The parallel flow tubes of the microchannel heat exchanger and the blue membrane plate (multilayer coating selectively absorbs the blue titanium membrane plate) adopt an integrated welding method, which is completed in one low-temperature welding and combined to become the core heat collecting plate of the overall collector. The joint area between the tube and the plate is increased, which improves the thermal energy conversion of light and heat in the heat medium in the branch tube. After the integrated welding of the microchannel and the blue membrane plate is adopted, its structure is similar to that of a flat box-type flat collector. This type of collector eliminates the heat conduction resistance of the fins, and the thermal efficiency is greatly improved. Compared with the tube-plate heat collector The device is about 30% higher. At the same time, the application of micro-channel parallel flow tubes also greatly improves the heat exchange efficiency. The heat exchange efficiency of micro-channel parallel flow tubes is 15%-30% higher than that of ordinary round tubes.

The collector glass cover is made of low-iron toughened glass, and the light transmittance can reach 92%. The heat insulation layer is a component in the heat collector that inhibits the heat-absorbing plate core from dissipating heat to the surrounding environment through conduction. The materials used for the heat insulation layer are: rock wool, mineral wool, polyurethane, polystyrene, etc. The material of the frame includes aluminum alloy, stainless steel, carbon steel, plastic, glass steel, etc., and can be molded by aluminum alloy plate at one time. The bottom plate of the heat insulation layer is the part that supports the bottom heat insulation layer in the collector. The main materials are galvanized steel plate, aluminum plate and so on. All accessories can be purchased in the market, and the connection between the collector and the water tank adopts the traditional method.

Claims (2)

1. A high-efficiency microchannel flat solar collector, comprising a glass cover plate, a heat absorbing plate, a frame, a thermal insulation layer, an inlet and an outlet pipe, and a bottom plate, the glass cover plate is on the surface of the heat collector, and the glass cover plate is below the The heat-absorbing plate has a heat-insulating layer inside the frame of the heat collector, and the bottom plate of the heat-insulating layer is at the bottom. , Outlet pipe. 2. The high-efficiency micro-channel flat solar collector according to claim 1 is characterized in that the parallel flow tube and the blue film plate of the micro-channel heat exchanger are integrated welding, and are combined into the core heat collecting plate of the integral heat collector .

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