Are you wondering what the 6.26 daily useful heat quantity of the solar water heater means? The solar water heater can provide 6.26 joules of heat per day. This value is based on the fact that one square meter of solar water heater can produce approximately 6 kilojoules of heat per day, which is then converted to joules. The design of the solar water heater can improve the efficiency of the water heater, allowing it to use solar energy more efficiently, thereby increasing its efficiency in heat production, reaching 6 kilojoules of heat per day.
Which is more cost-effective, solar heating or photovoltaic heating?
The vacuum tube of the solar water heater can generate 2.42 kWh of heat in one hour. For a 58mm x 1800mm vacuum tube, when the thickness of the collector insulation layer is 5cm, the illumination area is about 0.093 square meters. When the thickness of the collar insulation layerreader is 10cm, the illumination area is about 0.090 square meters. To say, when the collector insulation layer is 10cm, the lighting area is about 0.090 square meters. When the thickness of the insulation layer of the casing is 10cm, the heat collected amount of a single 58mm x 1800mm vacuum tube is only 96.77% when the thickness is of 96.77%. of the insulation layer of the header is 5 cm. Assuming that the amount of solar radiation per square meter is 1 kWh and the heat collection efficiency of vacuum tubes is 52%, a collector with 50 tubes can absorb 2.42 kWh of heat in 1 hour when the thickness of the collector insulation layer is 5 cm. it measures 10 cm, it can absorb 2.34 kWh of heat in 1 hour, which represents a total difference of 0.08 kWh.
Why is the thermal efficiency of solar water heaters low?
Solar heating and heatinge photovoltaics are profitable.
1. The efficiency of photovoltaics is around 16 to 20%. The only efficient way to generate electricity and heat hot water is to use a heat pump, based on the average heat pump heating efficiency. about 2.6, the actual efficiency is 42%-52%.
2. If solar energy directly heats hot water, the efficiency can reach more than 80%. The initial investment in solar panels + heat pump is basically exorbitant.
3. In terms of energy conversion, solar water heaters are more efficient. Photovoltaic power generation and reheating first converts solar energy into electrical energy, and then the electrical energy is converted into thermal energy. With each conversion, energy is lost.
How long does it take for home solar water heater to heat up to 55℃
Thermal efficiency
Uniquement in relation to
solar energy
Thermal collection
Glass tubes
It is important
If you have already purchased solar power, you have no choice. The way to improve it is to clean the glass tube, inside and out, and wash it in passing.
Water tank
Scale
Severely affecting
Insulation effect
If you haven't purchased it yet, you should pay attention to Tainereng heat collecting glass tubes . Both major brands of glass tubes are good. The first is produced by. the Sino-German joint venture of the Shandong Linuo Group.
Sun Rain
,
Four SeasonsPastoral
uses all its glass tubes, and the second is
Tsinghua Sunshine
special glass tubes, Shaile glass tubes, the quality of glass tubes It cannot be identified by naked eye, so you can only choose the brand
The standard
is thee
degree of vacuum
, and
The positive degree of the thermos bottle
means the same thing. There are also people in the market called Three Executives and Zijin Guan who are suspected of speculation. The most important point is that solar panels with reflectors have been eliminated from the market.
It's really hard to say because we don't know the initial water temperature, heating power and water storage capacity. I can give you a formula:
Heating time (seconds) = (reached water temperature ℃ - initial water temperature ℃) × water storage capacity L × 4.8 /heating power (kW)/efficiency
For example: The initial water temperature is 10°C, the water storage capacity is 100 L, the heating power is of 1.5 kW and the efficiency is 80% (the efficiency of electric auxiliary heating of solar water heaters is generalweak). The time to heat to 55°C is:
(55-10)×100×4.8/1.5/0.8=18,000 seconds or 5 hours.