Gravity heatsink 2 to 3 collectors or 2.5 m2. Removes excess heat generated for sun snergy.

 

 

 

Gravity heatsink 2 to 3 collectors or 2.5 m2. Removes excess heat generated.

 

The heat sinks are gravity protection systems without electrical components that eliminate excess heat generated by the solar thermal systems, both as flat panels with vacuum tubes.

Comply with total reliability, technical requirements of the building code, section 3.2.2.3.1 HE4, the RITE, Barcelona Solar Ordinance Inspection Guide OST, V 2.0.-July 11, 2007, the UNE EN 12828 for limit the outlet temperature of the solar collectors at 105 ° C and all other ordinances applied in the Spanish territory.

The heat sinks by gravity prolong the life of the facility and eliminate corrective maintenance interventions as they avoid problems:

• - Corrosion and scale on the inside of the air intake manifold by
• - Cavitation of electric
• - Degradation selective surfaces of the manifolds
• - Fluid Degradation calorportante
• - Higher pressures and fluid losses calorportante
• - Installation Aging
• - Installation Heat stress (avoiding big jumps in temperature between room temperature and manifold)
• - By far the maintenance of the installation itself is performed by static dissipation.

DESCRIPTION OF THE OPERATION OF THE GRAVITY HEAT SINKS:

The temperature of 90 ° C has been considered as the limit conditions for operation of a solar thermal energy system with flat collectors. The system is composed of: 4-way thermostatic valve with cyclonic air separator and by-pass tube, finned copper heat exchanger in 3- and 6-tube coils, check valve. It allows three different possibilities of operation:

Normal functioning:

• The heat-carrying fluid passes exclusively through the collector field. The check valve prevents circulation through the heat exchanger. At temperatures below 90 ° C the valve opens the passage of water to the installation and keeps the path to the heat exchanger closed.

Partial dissipation with pump (low energy demand):

• In times of high solar input and low heat demand, a typical summer situation, and when the collector outlet temperature is around 90 ° C, the valve starts to open the path to the heatsink and occurs fluid cooling. From this moment on, the valve will pass more or less towards the heatsink, depending on the outlet temperature. The by-pass tube plays the return role of the heat exchanger. The higher the temperature, the larger the outlet section to the exchanger and the smaller the passage to the installation, and vice versa. The double plunger of the valve will position itself automatically, maintaining the set temperature limit of 90 ° C at all times.

Dissipation by gravity (pump stop):

• When the electric pump set is disconnected (failure, power supply interruption, absence due to school holidays, etc.) quickly, the fluid in the collectors reaches the maximum setpoint temperature, 90 ° C. The check valve, which is always open when the pump stops working, automatically establishes the circulation by gravity, THERMOSIPHON, between the collector flow, the by-pass pipe and the collector return. The water circulates through the by-pass pipe in the opposite direction and transmits the highest temperature of the fluid to the valve sensor. The valve opens the way to the exchanger and it will cool its entire surface. As in the previous case, the valve will position itself automatically limiting the approximate thermal jump of 60 ° C between the fluid in the collectors and the ambient temperature. The cold return water from the exchanger, with a higher specific weight than the hot water from the collectors, generates enough pressure to establish the circulation of the fluid, so that dissipation is regulated without more energy than that due to gravity.