Kuzeysan Enerji Grubu

TECHNICAL INFORMATION

COMPARING EVACUATED VACUUM TUBE COLLECTORS WITH FLAT PLATE    COLLECTORS

Evacuated tube collectors are superior to flat plate collectors in a number of ways.


Due to the cylindrical shape of the evacuated tube, the sun is perpendicular to the surface of the glass for most of the day.

Flat plate collectors have the disadvantage that the sun is only perpendicular to the collector at noon and thus a proportion of the sunlight striking the surface of the collector is likely to be reflected.


As the name suggests, air is evacuated from the evacuated tube to form a vacuum. This greatly reduces conductive and convective heat loss from the interior of the tube. As a result wind and cold temperatures have minimal effect on the efficiency of the evacuated tube collector.

Flat plate collectors does not efficient subzero temperature


kuzeySAN evacuated tube collectors can often be used in subzero temperatures without the system sustaining damage.

Flat plate systems often require expensive and complicated "antifreeze" systems to be installed.

Due to the high efficiency absorption of solar radiation even during overcast conditions, combined with excellent insulative properties of the tube, evacuated tube collectors will heat water all year round (backup required for particularly overcast or rainy weather.)This type collectors can be used four season.

Flat plate systems can not be used four season.Especially in winter efficiently will be bad.

Due to the various advantages of evacuated tube collector over flat plate collectors, a smaller collector can be used to provide the same heating performance. For example, a standard household of 4-5 people would usually require a 150 water storage tank. Depending on your location, only 2 square metres of evacuated tube surface area would be required to efficiently heat this volume of water.

Flate plate solar collector can produce similar heat output to evacauted tube collector, but generally only during warm, still, sunny conditions. When averaged over an entire year, evacuated tube collector heat output per net m2 of collector area, is superior to flat plate.

kuzeySAN THERMOSIPHON SOLAR COLLECTORS HAVE GOT OTHER ADVANTAGES;

  • Low Cost Solar Water Heating
  • Easy to Install
  • No Electricity Required
  • Gravity Pressure Hot Water
  • High Quality Evacuated Tubes
  • All Parts Stainless Steel
  • 100L to 200L capacity
  • 6 Year Warranty

       COMPARING VACUUM TUBE COLLECTOR WITH FLAT COLLECTOR

                

 

MONTH VACUUM TUBE COLLECTOR   (MJ/M2) FLAT  COLLECTOR   (MJ/M2) RATE 
JANUARY 53 13 4.08
FEBRUARY 123 54 2.28
MARCH 223 116 1.92
APRIL 310 180 1.72
MAY 387 232 1.67
JUNE 393 243 1.62
JULY 437 267 1.64
AUGUST 357 223 1.60
SEPTEMBER 240 143 1.68
OCTOBER 163 84 1.94
NOVEMBER 67 23 2.91
DECEMBER 47 10 4.70

The inorganic heat pipe evacuated tube consists of the glass evacuated tube described above. In addition a copper heat pipe is installed within the tube. The copper heat pipe transfers from within the evacuated tube to its tip (condenser) which is plugged into the header pipe contained in the manifold. As water runs through the header pipe, heat is transferred from the copper heat pipe to the water.The diagram to the left shows the glass evacuated tube, copper heat pipe, and contoured aluminium heat transfer fins. The heat pipe is simply inserted into the glass tube, sandwiched between the two aluminium fins. The fins are molded to maximize contact area with both the heat pipe and the inside surface of the evacuated tube. This fin design greatly improves heat transfer to the copper heat pipe, and ultimately the water in the manifold.The heat pipe transfers heat to the manifold by a very simple method. The copper heat pipe is hollow and contains a patented inorganic non-toxic heat-transfer liquid. The hollow centre of the heat pipe is a vacuum, so that at even at temperatures of around 25-30oC the compound will vaporize.

 

When heated the vapor rises to the tip (condenser) of the heat pipe where the heat is transferred to the water flowing through the manifold. The loss of heat causes the vapor to condense and flow back down the heat pipe where the process is once again repeated. Heat pipes using inorganic heat transfer compounds exhibit heat transfer performance that is up to 3,000 times that of silver

Using inorganic heat pipes, heat is very efficiently transferred from the glass evacuated tube to the water. Heat pipes are widely used in many applications including air conditioning and computers (CPU cooling), as they provide reliable long term performance.

kuzeySAN uses heat pipes from a reputable manufacturer using a US patented inorganic heat transfer compound. This compound is nontoxic if ingested and does not irritate either eyes or skin. Even so, during normal use, the heat pipe is never in direct contact with the liquid circulating through the header pipe.

Inorganic heat pipes have a vacuum level of 4 x 10-6 Pa, which allows the heat transfer compound to vapourise at low temperatures of 20-25oC.