SOLAR PANEL DIRECT ABSORPTION

   INSTALLATION AND USE MANUAL

 

 

 

A - vertical legs for fixing on a flat surface

B - counterfeit vertical legs

C - inclined supports for fixing the solar panel

D - solar panel collector 

E - bar supports tubes

F - reinforcement of inclined supports

G - vertical leg countersinks (mount at the rear)

H - condensing expansion vessel pressurized at low pressure

I - caps for fixing the tubes

J - reinforced perforated corner fixing solar panel (recommended for all types of roof)

 

Fixing on a sloping roof: 

In the case of installing the solar panel with direct absorption on the roof, taking into account its weight between 80 and 120 kg, we recommend the use of the following fasteners:

1. Reinforced perforated corner (recommended for all types of roof)

2. Solar panel mounting flange (not recommended for direct absorption panels)

3. Perforated strip (recommended only for certain sheet metal or bituminous shingles)

When mounting the reinforced perforated corner, a tile slit will be cut with a flex through which the corner will pass and then it will be insulated with UV-resistant silicone or other similar materials. It will be fixed preferably on one of the beams (horns) of the roof or on a piece of board fixed between two beams (horns).

When using the clamps for fixing the solar panel or the perforated strip to the ceramic or concrete tile roofs, there is a risk of cracking the tile due to the weight of the solar panel with direct absorption.

Fixing the connection pipe between the boiler and the solar panel:

- The piping must be fixed in such a way that no loops form in the air.

- It is recommended that the distance between the panel and the boiler be as small as possible to reduce energy losses.

 

Condensing expansion vessel:

- The condensing expansion vessel is mounted at the 3/4 connection in the middle of the solar panel and two 3/4 bends are used at 90 ° with which we can tilt so that the expansion vessel has a vertical position (see images above up) .

- If the solar panel is located below the boiler, then the expansion vessel will be installed on the boiler flow, ie at the top of the coil.

- At the top of the collector there are 2 connections of 1/2 (they will be closed with a cover of 1/2) and a connection of 3/4 (the condensing expansion vessel will be attached with the help of the two elbows of 3 / 4 at 90 ° as in the figure above).

 

Recirculation pump:

The recirculation pump will be installed on the return (at the bottom of the boiler coil, see image below) and the venting will be done by opening or closing the central screw repeatedly with both the pump on and the pump off, until it no longer exists. air bubbles in the installation.

 

Safety solenoid valve:

- The safety solenoid valve is mounted on the hot water outlet of the boiler and has the role of maintaining the glycol temperature below 70 ° C by controlling the water temperature in the boiler.

- At the outlet of the solenoid valve, a silicone tube or similar is mounted, which is connected to the sewer, thus ensuring the evacuation of excess hot water if necessary.

- The electrical connections will be made by an authorized person and will be insulated accordingly.

 

Fixing the solar panel tubes:

- Prepare a solution of water and liquid soap, which is applied to the end of the tube before inserting it into the solar panel.

- Carefully insert the tube into the solar panel and then lower it into the covers at the base of the holder.

- Tubes with a CPC insulated mirror layer can be rotated as needed, ie with the mirror positioned behind the tube (normally) or with the mirror positioned towards the solar radiation (if the power of the solar panel is to be reduced)

Determining the angle of inclination of solar panel:

When mounting the solar panel at an angle of less than 45 degrees, it increases its efficiency during the summer, decreases the efficiency of the solar panel in October-March and becomes more sensitive to hail.

When mounting the solar panel at an angle greater than 45 degrees, it decreases its efficiency during the summer, increases the efficiency of the solar panel in October-March and becomes more resistant to hail.

Antifreeze / glycol loading:

- Charging with antifreeze is performed through a charging valve mounted in the technical chamber on the glycol circuit until the glycol flows from the expansion vessel mounted above the solar panel.

- Antifreeze loading can also be done through the condensing expansion vessel until the glycol level reaches the height of the expansion vessel.

- The concentrated glycol will be diluted to 1 liter of antifreeze with 5 liters of water.

- ATTENTION !!! when loading with antifreeze or water, make sure that the tubes of the solar panel have been previously covered with a blanket at least two hours before. Solar panel tubes, if exposed to the sun, can reach up to 200 ° C and in contact with cold liquid (20-30 ° C) they can crack.

 

                SOLAR PANEL CONNECTION SCHEME WITH DIRECT ABSORPTION

 

 

1) Solar panel, 2) Condensation expansion vessel, 3) Solar panel sensor, 4) Automation, 5) Solenoid valve, 6) Hot water connection, 7) Boiler sensor, 8) Boiler, 9) Recirculation pump, 10) Filling valve, 11) Cold water connection

 

THERMAL POWER PLANT ASSEMBLY SCHEME WITH PUFFER, BOILER AND SOLAR PANEL (with intermediate heat exchanger)

5) central heating, 6) recirculation pump, 7) 3-way solenoid valve Termocasa (2PCS), 8) hot water boiler outlet, 9) domestic hot water boiler, 10) cold water boiler inlet, 11) storage tank (buffer), 12) building heating circuits, 13) directional damper, 14) recirculation pump, 15 ) solar panel with direct absorption, 16) heat exchanger, 17) recirculation pump, 18) recirculation pump.

  The 3-way valve (7) on the green circuit and the recirculation pump (18) will be powered by the solar panel automation (12-solar panel controller-see below).

 

 

 ASSEMBLY SCHEME OF HEAT PUMP WITH PUFFER, BOILER AND SOLAR PANEL 

1) central heating, 2) DHW (domestic hot water) boiler, 3) recirculation pump, 4) 3-way solenoid valve, 5) recirculation pump, 6) gravity damper, 7) solar panel, 8) recirculation pump, 9) building heating circuits, 10) storage tank (buffer) ...   The 3-way solenoid valve (4) from the green circuit and the recirculation pump (5) will be supplied from the automation of the solar panel.

 

 

1 - thermostat indicator on

2- Solenoid valve / house recirculation pump operation indicator

3- Solar panel pump operation indicator

4- Button +

5- Menu button

6- Button-

7- Alarm

8- Display

9- Solar panel sensor

10- Boiler sensor

11- Solar panel pump supply

12- Supply solenoid valve / house recirculation pump

13- Food automation 230v

 

Operating principles of the solar panel controller:

It can be used to control the solar panel pump and to control the safety solenoid valve or the recirculation pump in the home heating system. The solar panel pump will work on the principle of temperature difference. The controller starts the pump when ΔT between the water temperature in the solar panel and the temperature in the boiler is higher than H-10 degrees. The pump will run until the temperature detected in the solar panel is lower than in the boiler, set by hysteresis H. Stopping the pump is dependent on the set hysteresis.

Onset hysteresis is always 10 ° C lower than stop hysteresis. If the start hysteresis is set to 20 ° C, the stop hysteresis is automatically 10 ° C. If you set the hysteresis to 10 ° C, the pump will run until a balance is reached between the temperature of the solar panel and the boiler. The recirculation pump will operate when the temperature in the boiler exceeds the set one and stops when the temperature in the boiler is lower than the set one.

 

Continuous control function:

   By pressing the square buttons and the up arrow, the controller will enter the continuous control mode. The safety solenoid valve or the house recirculation pump will run until the square buttons and the up arrow are pressed again. By pressing the square and down arrow buttons, the controller will enter continuous control mode, the solar system recirculation pump will run until the square and down arrow buttons are pressed again. To view the temperature in the boiler, press the down arrow button, for a few seconds the temperature in the boiler will be displayed. The controller also benefits from the anti-freeze function. This function activates the pumpa for continuous operation, if the detected temperature drops below 5 ° C.

 

Controller operation:

To enter the controller control menu, press the square key. The C, U, H icons should appear on the display, and at this point you can change the settings using the up arrow and down arrow buttons. After a few seconds the thermostat will return to normal operation and display the temperature in the solar panel.

 

Hysteresis (difference at start-up)

   This is the difference between the temperature at which the thermostat starts the pump and the temperature at which it stops. The thermostat has a fixed hysteresis. For example, if the set temperature is 50 ° C, the pump will start when the temperature detected by the sensor exceeds the set temperature, and will stop when the detected temperature drops below 48 ° C.

 

Thermostat functions 

U - Maximum temperature in solar collector (recommended 80 degrees)

H - Solar panel pump hysteresis (recommended 10 degrees)

C - Temperature at which the safety valve opens (recommended 57 degrees)

 

Controller mounting:

The controller must be installed by an authorized person!

The hot water sensor must be mounted in a sheath in the middle of the boiler and the sensor from the solar panel will be fixed on the panel flow (at the glycol outlet) by means of a clamp and isolated from external factors by insulating tape (sensor is not immersible in liquids).

The pump power cord must be connected as follows:

-Blue and brown - 230 V ·

-yellow / green - grounding

If "240" appears on the LCD screen - the temperature sensor is defective or the sensor connection is broken.

 If there are occasional power outages, we recommend using a UPS (minimum 350w) with pure sinusoid to avoid overheating the glycol and evaporating it.

 

 SOLAR PANELS - DIRECT ABSORPTION (ABSOLUTE NEW ON THE ROMANIAN MARKET)

 

   Solar panels equipped with new direct absorption technology produce thermal energy needed for the production of domestic hot water and for the preparation of the heating agent used to heat homes, public institutions, companies and pool heating.

   The main advantage of the new solar panels with direct absorption is the fact that the glycol comes into direct contact with the glass tubes and the heat transfer is maximum, compared to the heat pipe panels where the heat transfer is done through several heat exchangers (heat pipe). glass gives off heat to the aluminum fins which in turn give off heat to the heat pipe and then the heat is given off to the collector in which the glycol is).

   Due to the lack of elements that can be damaged, the direct absorption panels benefit from a 25-year guarantee that can be extended depending on the policy of each distributor.

   The efficiency of direct absorption solar panels is up to 30% higher than for heat pipe panels and up to 50% higher than for flat panels.

    Extremely simple installation allows the installation of direct absorption panels by any installer.

   The expansion vessel ensures the condensation of the superheated glycol and its reintroduction into the circuit eliminating the risk of evaporation.

   These types of solar panels together with a solar boiler and an automation station, create a complex solar system that works all year round (regardless of the temperature of the external environment). The solar system can be connected to any type of heating system that exists in the building.

The constructive variants are:

 18 tubes, product code TMC18

 25 tubes, product code TMC25

The solar panel is composed of:

 Vacuum glass tubes;

 Horizontal heat exchanger;

 Dural aluminum / stainless steel mounting bracket;

 Expansion tank ;

 Fasteners, accessories, screws, nuts, silicone gasket and rubber, sa

The glass tubes have a construction with double walls, of thermos type, having the vacuum level between the glass walls of 5 × 10-3 bar.

The outer tube has a diameter of 58 mm and a length of 1800 mm.

The glass tube inside is covered with two selective layers, one layer is of the Al-N-Al type which has the role of increasing the level of absorption of infrared radiation from the visible range of solar radiation up to 95%. The second layer has the role of refracting the thermal radiation inside the tube to be taken over by the thermal agent.

The glass used for the manufacture of the tubes is of borisilicate type 3.3 being resistant to hail.

Glass tubes have a very important role in the operation of the solar panel, they perform the following functions:

 they absorb infrared radiation from the visible range of sunlight

 refract the thermal radiation inside the glass tube until it is taken up by the thermal agent

 insulates very well the thermal system of absorption of infrared radiation from the external environment

  Inside the glass tubes, the thermal agent that takes the solar thermal radiation and transforms it into thermal energy even if the sky is covered by clouds.

  The position of the vacuum glass tubes on the support of the solar panels is always inclined, which gives it a high resistance to impact with hail and on the other hand the thermal agent with the highest temperature to be continuously at the top due the phenomenon of radiator heating the heat agent in the heat exchanger.

   The heat exchanger is made of stainless steel and has the role of taking over the thermal energy made by the tubes of the solar panel. The exchanger housing is 2 mm thick and is made of stainless steel resistant to harsh conditions imposed by the external environment. The thermal insulation of the heat exchanger is made of high density polyurethane with a thickness of 50-60 mm, insulation which in addition to having the lowest heat transfer coefficient with the outside also has the role of increasing the mechanical strength of the equipment.

   Due to the large capacity of the heat collector, direct absorption panel systems have very small hydraulic losses so they can be dimensioned in groups of up to 200 pipes / installation and are not limited to 120 pipes / installation as in the case of heat pipe panels.

   The inlet and outlet of the heat exchanger is made of pipe with a diameter of 22/28 mm. The connection with the external equipment is made by means of a removable elastic connector, it takes over the expansion and displacement due to the expansion.

   The support of the solar panel is made of duralumin / stainless steel U-type profiles that give it mechanical strength and corrosion resistance. The thickness of the profile, shape, structure, the way of fixing gives the solar panel stability in difficult atmospheric conditions (strong wind, deposition of a thick layer of snow, etc.)

   The angle of inclination of the support can be 20 ° - 90 °.

   The solar panel works all year round, regardless of the temperature of the outside environment. There is no danger of frost during operation because glycol is used in the circuit of the solar system, which withstands up to - 40 ° C. To reduce heat loss on the connecting pipes, it is insulated with high temperature resistant materials.
   Solar panels comply with all requirements imposed by national and international law and the conditions imposed by environmental standards. Using the panels son each building, reduce fuel consumption and do not eliminate significant amounts of emissions of pollutants into the atmosphere, andn especially CO².

 

List of authorized installers:

  

- Merca Constantin tel: 0745200004

(coverage of the counties: Bihor, Satu Mare, Arad, Timiș, Albă, Sălaj, Hunedoara, Maramureș, Bistrița Năsăud)

 

  - Varga Daniel tel: 0771346985

 (national coverage - Romania)

 

- Bârlea Marcel tel: 0784080000   

 (coverage of the counties: Bihor, Satu Mare, Arad, Timiș, Albă, Sălaj, Hunedoara, Maramureș, Bistrița Năsăud)

 

 - Andrei Borz tel .: 0740345209  

 

(coverage of counties: Satu Mare, Maramures, Bihor, Salaj)

 

 - Butuc Iosif tel .: 0741146358   

(coverage of counties: Constanta, Tulcea, Braila, Galati, Ialomita, Calarasi, Bucharest, Ilfov)