Tag Archive | "hot water"

Thermosiphon Solar Water Heating System

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Thermosiphon systems work on convective mode of heat transfer. The heating of water on large scale is the need of domestic as well as many industrial users. Different kinds of geyser and other devices are available in the market to accomplish this purpose. They use different kinds of energies like electrical, mechanical, chemical etc. and convert it in to thermal energy.

With the evolution of the concept of renewable energy and the development in solar technology, thermosiphon solar geysers are becoming common.

Modes of heat transfer

Generally, there are three modes of heat transfer.

  • Conduction
  • Convection
  • Radiation

 Conduction takes place in metals and convection is the phenomenon occurring in fluids. Radiation has something to do with heat transfer through waves. This is the way through which heat of the sun reaches the earth.

Convection in thermosiphon systems

The main working principle of a thermosiphon water heating system is convection. Convection is responsible for uniformly heating any liquid. Here the fluid of our interest is water.

 As you know, fluid when heated rises up. The same thing happens in thermosiphon water heating systems. Hot water rises up and the cold water comes down. In this way the whole water is heated uniformly.

The top layers of hot water are then passed to the places where they are desired to be used. The lower colder layers are further heated.

Gravity in thermosiphon systems

Gravity is the second most important factor that plays a vital role in the functioning of a thermosiphon solar water heating system.

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Flat-Plate Solar Collectors

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Initiation of every solar thermal heating process takes place with thermal collectors. These collectors are used to trap the solar radiations and draw heat from these radiations. These radiations pass through the liquid or air enclosed in the tube. These tube transfers the solar-heated to the system installed in the house.

Circulation systems in the collectors

Circulation systems in the collectors

There are two heat circulation systems open and closed loop system. In the open loop system the indoor air is heated by directly passing it through the thermal collector and in the closed loop system the heat exchanger transfers its heat to the inner parts of the home.  Flat-plate collectors are most commonly type of collectors used these days. These collectors are either liquid or air-based. Evacuated tube collectors can provide the most efficient of gathering solar heat. Flat-plate collectors are inexpensive and are mostly used at residential place or in any small scale application.

Flat plate Liquid Solar Collectors

Flat-plate collectors consist of metal box that is insulated and covered by a gazing. Read the full story

Important Things about Integral Collector Storage

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Passive solar heating is a great way to cut down on the maintenance cost of the free utility power and to save money on it. Passive solar heating systems harness sun power energy without using any type of mechanical or electrical tool. Passive solar heating systems are divided into three main types, one of which is integral collector storage (ICS).

Working of Integral Controller Storage Units

Working of Integral Controller Storage Units

The other types of passive solar heating system like flat plate or evaporated tube collectors utilize absorbent metal plates for heat transfer. On the other hand, integral collector storage units utilize only water. In simpler word, these systems rely on water that acts as collector itself. Water is stored in a storage tank. That tank is painted black and installed in an insulated box that is glazed on its one side. When the sunlight shines through the glazing on one side and strikes the black tank that is located on the other side, water that is contained in that tank become hot. Water is usually drawn from the top.

Do-it-Yourself ICS Units

Homeowners that are looking to heat small amount of hot water can build integral collector storage units by themselves without nay external help. In such cases, hot water becomes cool overnight and it remains available only during the day in the presence of sufficient amount of full and direct sunlight.

Advanced Integral Collector Storage Units

In more advanced or sophisticated integral collector storage units, cold water is available on demand from the house. Read the full story

Making a Solar Heater With Car Radiator

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Radiator is a tool placed in the vehicle engine to protect the engine from overheating. The radiator keeps the engine cool and prevents it from getting damaged. Not only this but the there are several other uses of a car radiator. If you are thinking to buy a water heater, and possess a radiator you can save money and get your hot water. We will tell you how to make a solar heater from a car radiator. Radiators can be used to make cheap and strong water heaters.

 Solar kits

Simple Technique and Simple Tools

You don’t need to be an expert in auto mechanics or electronics. Any average person without any knowledge of engineering can make a solar heater with a car radiator. All you need is a car radiator, a screwdriver, tack hammer, black spray paint, two rubber radiator pipes and two pipe fasteners. Once you have collected all the tools and gadgets you are ready to start your project.Radiator is the main component of your project therefore it is necessary for you to check it properly. Before you start make sure if it has been repaired, and does not leak. The radiator you will be using should also be properly flushed and pressurized. An unchecked or leaking radiator might not work properly and can cause problems later on.

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How Does Geothermal Energy Work

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Geothermal energy is the heat available from the earth. Now this heat can come from two main sources. One, the heat coming from the sun and the other is heat coming from the center of the earth itself.Theoretically speaking the geothermal energy is enough to meet all the energy demands of humans. But this whole heating potential is not extractable.

Geothermal Energy Due to Sun

The top surface of the earth is baked by the sun during the day. The earth conducts this heat underneath the surface. The effect of this is more pronounced during the winters – when the temperatures a few meters underground are 10-15 degrees Celsius.

Geothermal Energy from the Earth’s Core

Geothermal Energy from the Earth’s Core

The other source of geothermal energy is the hot center of our earth. The center of the earth has very high temperature of up to 6000 Celsius. Places which are more prone to volcanic eruption are mostly suitable for extracting geothermal energy. The hot pools and geysers are other apparent forms of geothermal energy at our disposal. The geothermal energy from the center of earth can be extracted by digging for deep pipelines which will require more cost.

Comparison of the Two Sources

The geothermal energy due to absorption of heat from sun rays is more uniform and can be used anywhere. This heat is mostly used to warm up the homes in cold countries.

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