physics


This refers to passive solar collector, where solar radiation is used to heat water. It is therefore not on the solar cells.

What characteristics should solar collectors have, to function in an optimal way?
Why should these properties be fulfilled?

If there is a water flow of 500 g / minute to a solar panel on one m2, how much water is heated up under optimal conditions during the passage of the collector? Expect that the collector is in Gothenburg and the calculation is done for one day in mid-June (noon)

asked by bark
  1. It makes no sense to use the noon position of the sun to predict the full-day solar energy received by a collector. The middle of June is very close to summer solstice time in the northern hemisphere. The latitude of Gothenburg is 58 degrees N. At noon on the solstice, the sun will be 90-58+23 = 55 degrees above the horizon. For optimum collection at that time, the solar panels should be tilted to the south by about 35 degrees. Then the sun's rays will be perpendicular to the panels at noon.

    That will not be the optimum panel tilt angle for all times of day and days of the year, however.

    There is a good discussion of this subject at
    http://www.macslab.com/optsolar.html

    For a single tilt that will not be changed during the year, the best angle is the latitude, times 0.75, plus 3 degrees. That would be about 46 degrees in Gothenburg

    posted by drwls
  2. how should i consider the flow of water
    500 g / minute and the area of the collector

    posted by bark
  3. 500 g/minute is a very high flow rate for a home solar water heater. How much do you need to heat the water in a single pass?

    For a single pass through the solar collector,

    (mass flow rate)*(specific heat of water)*(delta T) = (Solar heating per area)*(collector area) - convection losses.

    Convetion losses become high when you try to heat the water more than 10 degrees C above the ambient temperature.

    The solar heating per area will be about 1000 W/m^2 times a cosine factor, if the sun is out.

    posted by drwls

Respond to this Question

First Name

Your Response

Similar Questions

  1. physics

    This refers to passive solar collector, where solar radiation is used to heat water. It is therefore not on the solar cells. What characteristics should solar collectors have, to function in an optimal way? Why should these
  2. physics

    This refers to passive solar collector, where solar radiation is used to heat water. It is therefore not on the solar cells. What characteristics should solar collectors have, to function in an optimal way? Why should these
  3. Phyics

    In a solar water heater, energy from the Sun is gathered by water that circulates through tubes in a rooftop collector. The solar radiation enters the collector through a transparent cover and warms the water in the tubes; this
  4. physics

    In a solar water heater, energy from the Sun is gathered by water that circulates through tubes in a rooftop collector. The solar radiation enters the collector through a transparent cover and warms the water in the tubes; this
  5. physics

    In a solar water heater, energy from the Sun is gathered by water that circulates through tubes in a rooftop collector. The solar radiation enters the collector through a transparent cover and warms the water in the tubes; this
  6. physics

    In a solar water heater, energy from the Sun is gathered by water that circulates through tubes in a rooftop collector. The solar radiation enters the collector through a transparent cover and warms the water in the tubes; this
  7. Maths

    A solar heater with a collector area of 58.0 m2 is required to heat 2560 kg of water. Under the same conditions, how much water can be heated by a rectangular solar collector 9.50 m by 8.75 m?
  8. physics

    A solar collector is placed in direct sunlight where it absorbs energy at the rate of 780 J/s for each square meter of its surface. The emissivity of the solar collector is e = 0.76. What equilibrium temperature does the collector
  9. Physics

    Solar heating takes advantage of solar collectors such as the type shown in the figure . During daylight hours, the average intensity of solar radiation at the top of the atmosphere is about 1400 W/m^2. About 50% of this radiation
  10. physics

    (a) A solar collector is 12.0% efficient in gathering solar energy and converting it to heat. If the average intensity of sunlight on one day is 700 W/m2, what area(m^2) should your collector have to gather energy at the rate of

More Similar Questions