Tag: solar water heater

solar water heater

Solar Water Heater.

How Does The Non- Pressure System Work

The non pressure gravity feed complete system consists of vacuum glass tube collector, and insulated storage tank, feeder tank, and a stand. the evacuated glass tuve are filled with water and exposed to the sun. Thus heating up the water in the glass tubes. as the specific gravity of cold water is heavier than hot water, the hot water in the glass tubes starts to rise in the insulated water tank and the cold water in the tank sinks in to the glass tubes. As this cycle is repeated, water in the solar water heater gets heated. this process in known as the thermosyphon and is based on natueral convection.

TECHNICAL DATA of Osmo Solar water heater

Tube length                                    : 1899mm

Outertube diameter                    :58mm

inner tube diameter                            :47mm

Galss thickness                                :1.6mm

Thermal expansion                              :3.3*10-6°c

Absorptivity                                   :93%

Coating                                        :AL- N- AL

Inner Tank                                     :SUS 304 -2B with 0.5 mm

Outer Tank                                     :Stainless steel with 0.4mm

Frame                                          :Stainless steel with 1.5 mm/1.2 mm

Insulation                                     :50mm of high density polyurethane foam

SAFETY PRECAUTION

  1. Solar water heater/collector should always be kept and placed out of reach of infants and children.
  2. do not touch or put cold water inside the vacuum tubers if the tuves have been exposed to sun twith out water inside.
  3. the water temperature of the solar water heater can be very high, so please adjust the mixing valve to a suitable positon carefuly anbd test water before bathing. Hot water above 50°c can cause scalding.

MAINTENANCE  SOLAR WATER HEATER

  1. Regualary inspect the solar water heater rtank to make sure its not damaged.

Also check for any rusting in the plumbing lines. Do necessary repairs using the authorized service provider.

  1. Blockage or damage to the vent pipes can created severe damage to the solar water heater. once this situation happen , colse the cold water inlet and hot water outlet valves immediately and call the authorized service provider for rectification of the problem.
  2. Do not connect any type of pressure relief device to the vent pipe of this water heater.

Compact Solar Water Heater (Osmo solar water heater)

This is ideal for homes, apartments and residential buildings. Used for supplying domestic hot water with non-pressurized systems.

 

solar water heaterosmo solar water heater

Products Code Osmo 240LTR Osmo 280LTR Osmo 360LTR
Number of People 3-6 6-8 8 and above
Number of Tubes 20 24 30
Solar Capacity 240 L 280 L 360 L
Dimensions (cm)
(Width-Length-Height)		 157-155-170 194-155-170 242-155-170
Weight (kg) 83 100 119
Price 44,000 52,000 64,000

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.