Patent Application
20090308378
Applicants claim priority under 35 U.S.C. §119 of German Application No. 20 2008 007 796.6 filed Jun. 11, 2008.
The invention relates to a solar heat powered system comprising at least one solar collector, to which lines for a solar fluid are connected
Solar heat powered systems are used to heat secondary heat carriers (heating circuit water, potable water, cooling brine). A solar fluid is heated for this purpose in thermal solar collectors. The heated solar fluid is brought into operative heat-transferring connection with the secondary heat carrier via lines in heat exchangers so as to heat the secondary heat carrier.
Due to the increasing costs for primary energy, solar collector fields are designed to be increasingly larger. Solar collector surfaces leading to a large volume of solar fluid, which is heated in midsummer, is available in particular for industrial users. To be able to process these large volumes of solar fluid, accordingly large heat exchangers are required within or outside of accordingly dimensioned accumulators. The size can lead to space problems. Components, such as pumps and the like, which are required, in the heat exchangers or in the area of accumulators, must furthermore likewise be embodied to be increasingly larger.
The invention is based on the object of specifying a solar heat powered system of the afore-mentioned species, which can also be used for expanded solar collector fields using justifiable efforts and costs.
This object is solved according to the invention in that the feed line for the solar fluid leading away from the solar collector is divided into at least two partial lines in sections and in that at least one heat exchanger is arranged in each partial line.
With the solar heat powered system according to the invention, provision is not made for a heat exchanger, which would have to be embodied in each case to be larger in response to a larger volume of solar fluid, but a division into a plurality of heat exchangers takes place. The plurality of heat exchangers is arranged in partial lines, which are different from one another and which are designed like a cascade. The partial lines run parallel to one another so that the solar fluid is in each case only guided through one heat exchanger. The heat exchangers can thereby be arranged within an accumulator or can also be arranged outside of an accumulator. A secondary heat carrier is then supplied to said heat exchangers from the accumulator via corresponding lines.
By dividing the feed line for the solar fluid, the plurality of heat exchangers can each be embodied to be more compact. Standard heat exchangers, which are arranged in a modular manner depending on the requirements, can be used. Standard heat exchangers are available quickly; advantageously, a respective special custom production for a certain solar heat powered system is not necessary. The same parts provide for a minimized storage.
According to a first development of the invention, provision is made for the line lengths from the division point of the feed line to each heat exchanger to be approximately the same. In so doing, a piping according to “Tichelmann” takes place, which provides for an equal energetic yield of the solar fluid, which is fed to the heat exchangers.
The solar heat powered system according to the invention can be used for a potable water network, a heating water network or for a combination of these two networks. When the heat exchangers are removed from the accumulators and when they are arranged in so-called transfer stations, in which control units are still present, an inexpensive mass storage can then be used for the respective secondary heat carrier.
Pumps comprising alert outlets are inserted into the lines for the solar fluid according to a development of the invention, preferably in the area of the transfer stations. High-efficiency pumps are preferably used. If these pumps have an alert outlet, they can display an occurring malfunction. When a flow is made possible in a partial line, for example, through functional pumps, this flow of the solar fluid through a defective pump can have come to a standstill in a parallel partial line. The solar fluid would then stagnate in this partial line. A pump is regularly used for the solar fluid and a pump is used for the secondary heat carrier in response to an external heat exchanger. Both pumps preferably encompass alert outlets so that the functionally reliable operation of the solar heat powered system can also be monitored remotely.
Preferably, the heat exchangers are arranged in a vertical orientation of their media flow ducts. This arrangement has proven to be advantageous for an optimal transfer of the heat.
An exemplary embodiment of the invention, which results in further inventive features, is illustrated in the drawing.
The solar heat powered system in
The solar heat powered system furthermore encompasses an accumulator 6. A secondary heat carrier is guided out of this accumulator 6 to the heat transfer stations 3 via lines 7 and is likewise guided through the heat exchanger 4 by means of pumps 8.
Provision is made according to the invention for the line 2 from the solar collectors 1 to the heat exchangers 4 to be divided into two partial lines 9. Both heat exchangers 4 are arranged parallel to one another; standardized heat transfer stations 3 can be used thereby. The line 7 for the industrial water is necessarily also divided into partial lines 10.
The heat transfer stations 3 are once again illustrated in
| Number | Date | Country | Kind |
|---|---|---|---|
| 20 2008 007 796.6 | Jun 2008 | DE | national |
