Stoves and furnaces – Solar heat collector – With control means energized in response to actuator...
Patent
1998-09-10
2000-04-11
Lazarus, Ira S.
Stoves and furnaces
Solar heat collector
With control means energized in response to actuator...
126714, F24J 240
Patent
active
060476966
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention concerns a method for the use of the thermal accumulator of a solar power installation. The heat accumulator of a thermal solar power installation is usually charged by a two point regulator having hysteresis. As soon as the temperature of the solar power collector exceeds that of the heat accumulator by a particular amount, a pump is switched on which pumps a heat carrier from the solar collector into the heat accumulator. The heat carrier releases a portion of its heat at this location and flows back into the solar power collector via a return conduit. When the temperature difference between the collector and the heat accumulator reduces during pump operation to below a particular predetermined value, the pump is switched-off. This simple regulation has the disadvantage that the heat losses at the beginning of the pumping procedure as well as the efficiency of the solar collector are not taken into account. Also known in the art is a regulation device having a conduit adjustment for solar power thermal installations (G 92 07 743.9) with which one attempts to optimize the energy input of the solar collector into the heat accumulator by evaluating the time gradient of the collector temperature and the time gradient of the temperature difference between the heat carrier entering into the heat accumulator and exiting out of the heat accumulator. These methods have the common feature of regulating the flow of the heat carrier through the collector and heat accumulator in a temperature dependent fashion.
SUMMARY OF THE INVENTION
The invention has, in contrast thereto, the advantage that the transport device is only switched on when the internal energy of the heat accumulator is thereby increased. The solar installation is regulated using the internal energy thereof and of its components also taking into consideration installation specific quantities resulting from physical characteristics of the solar installation such as volumes and temperatures and e.g. can be input as an additive term in the minimum collector temperature, to facilitate a condition adapted operation of the solar installation. The avoidance of unnecessary switching-on minimizes the energy requirements of the transport device.
In an additional advantageous configuration of the method, the transport device is only switched-on when the switch-on condition in accordance with specific method steps is satisfied and when the second derivative with respect to time of the difference between the internal energy of the heat carrier located in the energy collector (1) and in the connection conduit (4) and the internal energy extracted from the heat accumulator (2) in accordance with certain method steps is less than zero (<0) so that the heat input is maximized while simultaneously minimizing the energy requirements for transporting the heat carrier.
The invention having the characterizing features claimed has, in contrast thereto, the advantage that the heat supply of the energy collector to the heat user is improved and the efficiency of the energy collector is increased and the heat losses in the connecting conduits are minimized since the transport device can already be switched-on as soon as the temperature of the heat carrier exceeds the temperature of the heat user.
In accordance with an additional advantageous configuration of a device for carrying out the method according to the invention, the transport device is a pump so that the heat carrier is circulated independent of the flow resistance of the solar collector, the connecting conduits and the heat exchanger.
In accordance with an additional advantageous configuration of a device for carrying out the method according to the invention, the transport device and the check valve are replaced by a regulated flow-through valve so that the energy requirements of the installation are minimized by taking advantage of the natural convection of the heat carrier to transport the heat collected in the energy collector into the heat accumulator.
In accordan
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patent: 5601075 (1997-02-01), Lai
Clarke Sara
Lazarus Ira S.
Vincent Dr. Paul
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