Question

Draw a hybrid solar water heating system.

Answer 1

Block diagram of hybrid water heating system is as shown below:

EQUIPMENTS:

1. Solar flat plate collector

2. Gas geyser

3. Electrical heater coil

4. Digital temperature indicator

Solar flat plate collector(SFPC)

The liquid flat plate collector is the most widely used solar collector because it is simple in design, has no moving part

and requires little maintenance.

The basic parts that make up a conventional liquid flat plate collector are

1. The absorber plate

2. The tubes fixed to the absorber plate

3. The transparent cover

4. The collector box

The main advantage of a flat plate collector is that it utilizes both the beam and diffuse components of the solar

radiation. In addition, because of its simple stationary design, it requires little maintenance. The liquid heated is

generally water. However, sometimes mixtures of water and ethylene glycol are used if ambient temperature is below

0 ? C are likely to be encountered

Gas geyser

The Gas geyser here we are using is tank less gas geyser. Tankless gas geyser also called instantaneous, continuous

flow, inline, flash, on-demand, or instant-on water heaters are gaining in popularity. These high-power water heaters

instantly heat water as it flows through the device, and do not retain any water internally except for what is in the heat

exchanger coil. Copper heat exchangers are preferred in these units because of their high thermal conductivity and ease of fabrication.

Working principle

The over head tank is placed at the top most level that is on the roof of any building .the cold water are stored in the

over head tank .the water from the tank is made to flow through the pipe and get collected in the storage tank of the

solar flat plate collector. The water is drawn into the collector tubes. The collector tubes are usually made of copper.

The radiations are directly made to fall on to the absorber plate. The absorber plate absorbs the radiation from the sun

and then transfers the heat to the collector tubes. By the process of convection the water gets heated up and tends to

move upwards. The above working is due to the thermosyphon principle