Solar apparatus with at least two solar collectors with different exposure

Abstract

A solar heating system and a method for controlling the system, the system including at least two solar collectors with different exposure, a load, a main supply line which branches into individual supply lines to the solar collectors, and a main return line into which lead individual return lines from the solar collectors, a distribution valve which is arranged at the branch-off of the main supply line to the individual supply lines or at the branch-off of the main return line to the individual return lines, and a pump for conveying a heat transfer medium.

1 . A solar heating system, comprising:
 at least two solar collectors with different exposure,   a load,   a main supply line which branches into individual supply lines to the solar collectors,   a main return line into which lead individual return lines from the solar collectors,   a distribution valve which is arranged at a branch-off of the main supply line to the individual supply lines or at the branch-off of the main return line to the individual return lines, and   a pump for conveying a heat transfer medium,   wherein said distribution valve is arranged as a mixing valve.   
     
     
         2 . A solar heating system according to  claim 1 , wherein the distribution valve is arranged at the branch-off of the main supply line to the individual supply lines in the direct vicinity of the solar collectors. 
     
     
         3 . A solar heating system according to  claim 1  wherein first temperature sensors are respectively arranged in the individual return lines. 
     
     
         4 . A solar heating system according to  claim 3 , wherein a further temperature sensor is arranged in the main return line. 
     
     
         5 . A solar heating system according to  claim 4 , wherein the further temperature sensor is arranged directly close to the load. 
     
     
         6 . A solar heating system according to  claim 1 , wherein the distribution valve has a continuously variable control range of 0% to 100% for each of the branch lines. 
     
     
         7 . A solar heating system according to  claim 1 , wherein the pump is arranged as a speed-controlled pump which is disposed in the main supply line. 
     
     
         8 . A solar heating system according to  claim 1 , wherein the solar collectors are oriented in different directions of the sky. 
     
     
         9 . A solar heating system according to  claim 1 , wherein the solar collectors have different inclinations. 
     
     
         10 . A solar heating system according to  claim 1 , wherein the distribution valve is arranged as a continuously controlled valve. 
     
     
         11 . A method for controlling a solar heating system with at least two solar collectors of different exposure which are supplied via a common pump with a heat transfer medium, wherein the temperature of the heat transfer medium is controlled downstream of the solar collectors by dividing the volume flow of the heat transfer medium to a uniform value. 
     
     
         12 . A method according to  claim 11 , wherein first controller triggers a mixing valve which divides the through-flow of the heat transfer medium through the solar collectors in order to keep the temperature difference downstream of the solar collectors as low as possible. 
     
     
         13 . A method according to  claim 11 , wherein a further control of the pump occurs independently of the control of the temperature difference, which further control is configured for maximizing the thermal yield and/or for minimizing power consumption. 
     
     
         14 . A method according to  claim 13 , wherein the further control is performed by setting a speed of the pump.