Tag: solar water heater in nepal

Osmo solar water heater

Osmo solar water heater

Evacuated Tube Collector Solar Water Heaters in Nepal

Osmo solar water heater in Nepal Kathmandu

Working Principle of Evacuated Tube Collector (ETC) System provided by HK Traders :

HK Traders Solar Water Heater, the brand name called osmo solar water heater works on a simple principle.

Solar water heating systems using vacuum tubes made of borosilicate 3.3 which is very good for absorption of heat with special coating to absorb the solar energy are called as Evacuated Tube Collector system. And it is 2.0kg weight. The size of the Tube is 58*1800mm.

Inner glass tube is coated with the world best magnetron sputtering HI- tech layer of CU/SS-ALN with AL base.

Vacuum tube, as shown in the sketch, is the main component, which absorbs solar energy. The vacuum tube is an assembly of two concentric, borosilicate glass tubes.

Air between the gap of two glass tubes is evacuated. It results in high level of vacuum, which acts as the best insulation to minimize the heat loss from inner tube. The black coating on the inner tube absorbs the solar energy and transfers it to the water. The water on upper side of Vacuum Tube becomes hot and get lighter, so it starts moving upwards in the tank. At the same time cold water, which is heavy, comes downward from the tank and is stored at the bottom. The phenomenon is called as natural Thermo syphon circulation, which occurs in every tube.

Thermosyphon Systems : In this type water flows through the system and when water gets warm it rises as cooler water sinks. The collector is installed below the storage tank so that warm water will rise into the tank. These systems do not involve any pump and are more reliable.

HK Traders Evacuated Tube Collector Solar Water Heater in Nepal

Features:

  • High quality tubes made from borosilicate glass
  • No clogging/choking
  • Long lasting
  • Better performance in winter and cloudy days
  • Inner glass tube is coated with the world best magnetron sputtering Hi-Tech, layers of CU/SS-ALN with AL base
  • Heats water to a very high temperature
  • Makes hot water available even on partially cloudy days
  • High quality PUF insulation for maintaining high temperature of water inside the tank
  • Compact
  • Easy to install, operate and maintain
  • Works efficiently with hard water
  • 6 mm ss tank thickness for hot water storage
  • 1.2 mm stainless steel stand
  • Safe and environment friendly

Specifications of Evacuated Glass Tubes:

Material of Glass Borosilicate Glass
Length 1800 mm
Outer diameter 58 mm
Thickness of Glass Tube Outer tube thickness: 1.8 mm, inner tube thickness: 1.6 mm
Selective coating type CU/SS-ALN with AL base

How does solar water heater works

Solar water heaters perform three basic operations before the hot water comes out of your tap:

solar water heater in nepal

1. Energy Collection: Sunlight is collected and converted to heat energy.Solar Water Heater is an environmentally friendly device to absorb free renewable solar energy to produce hot water economically

The solar collector is mounted on or near your home facing south. As the sunlight passes through the collector’s glazing, it strikes an absorbing material. This material converts the sunlight into heat, and the glazing prevents the heat from escaping in a similar manner to leaving a car parked in the sun with its windows rolled up. The temperature inside a glazed solar collector on your roof can easily reach 150°C when there is no heat transfer fluid flowing through it.

The two most common types of solar collectors used in solar water heaters are glazed flat plate and evacuated tube collectors. A glazed flat plate collector consists of a shallow rectangular box with a transparent glass “window” covering a flat black plate. The black plate is attached to a series of parallel tubes or one serpentine tube through which air, water, or other heat transfer fluids pass.

An evacuated tube collector consists of several individual glass tubes, each containing a black metal pipe through which the heat transfer fluid passes. The space between the pipe and the glass tube is “evacuated,” so the air is removed.

Although uncommon, unglazed plastic collectors can be used as a seasonal solar water heating system. However, they are used mostly for pool heating. Each collector has its advantages, and each can perform well if matched with the proper, well-designed, storage unit.

solar water heater in nepal

solar water heater in nepal

2. Energy Transfer: Circulating fluids transfer the collected energy in the form of heat to a storage tank.

Heat energy is transferred from the collector to the water storage tank. In some water heaters, hot fluid is pumped from the collector to the storage tank. The pump is powered by electricity that either comes from an electrical wall outlet or a small photovoltaic module located beside the collector.

In other types of solar water heaters, the sun heats the storage tank directly, so the fluid in the collector is heated and rises naturally to a storage tank above the collector. This type of solar water heater is often referred to as a thermosiphon system. It does not require an electric pump. Passive solar and solar photovoltaic-powered systems will continue to operate even if there is a power outage. The products that require electricity from a wall outlet will not operate during a power outage.

3. Energy Storage

Solar-heated water is stored in an insulated tank until you need it. Hot water is drawn off the tank when tap water is used, and cold make-up water enters at the bottom of the tank.

Solar water heaters tend to have a slightly larger hot water storage capacity than conventional water heaters. This is because solar heat is available only during the day and sufficient hot water must be collected to meet evening and morning requirements.