Solar air-conditioning (SAC) - Guilt-Free Comfort for Summers
Early summer usually bring a welcome relief from the bone chilling winters, but come April and May, will begin in the summer heat took its toll, both physically and mentally. And if it is a tropical climate, may, as in many parts of India, the hottest days are stressful all at once. The energy levels of the individual to fall and so their productivity.
This is when the modern air-conditioning comes as a godsend. A very large number of offices, laboratories, hotels, publicThe buildings are equipped with air conditioning. Central air conditioners provide cooling in every corner of the workspace.
While these all sound good, it is not. Air conditioning is synonymous with big heavy power consumption (and waste) not only heavy bills, but also the frequent power outages feared. The next step is - of course - set DG to achieve the desired comfort at home while blowing clouds of black smoketo bear the sound terribly high to the outside world and the environment.
In the middle to save us from the fury of nature, we inadvertently attack the nature more and more that are still angry every now and then return. One of the major points of concern is therefore the danger of increasing global temperatures (global warming!). What must we do to survive and survive with comfort?
Do not forget we have aimmense source of energy in the sun itself, that we shield. One answer is to generate electricity with solar energy. And 'free and for now we can safely assume unlimited. Yes, that solar energy can light our homes and cook our food. But it can also cool our homes? The answer is still yes. Solar air-conditioning, a revolutionary technology provides the answer and future.
Solar Air conditioningrefers does not use air conditioning (cooling), solar energy. A liquidor a gaseous substance collected on the surface of a solid, porous material (adsorption) or is acquired by a liquid or solid material (absorption to provide the necessary cooling). In some processes, the air is directly related, that is treated in terms of temperature and humidity
These heat and air conditioning cooling process is the heart of every solar cooling system. The principle of assisted absorption air conditioning is shown in the graph.Solar energy is used to dehumidify the absorbent.
This is a 9-step process. In phase 1, 2, sorptive dehumidification of outside air increases, while the rise in temperature by the heat released by adsorption. Then the air in counterflow heat recovery of exhaust air from the rotor (point 2 to 3) is cooled. The air cools further (phase 3 to 4) with evaporative humidification; Thus, the air supply, as the building has a lower temperature and less water vaporoutdoor air. Warming of 4-5 air is, and if required the addition of water vapor. Then, during the second phase, the construction of 6 exhaust temperature is lowered by evaporative cooling in the humidifier. The air is heated (level 6-7) in countercurrent to the air intake for the heat recovery rotor. The air is heated further (stage 7-8) from external heat sources (eg solar system). Finally, the point is regenerated 8-9 Absorptiondesorption from water related.
Open and Closed Loop Cooling System:
Open cycle are lower rates of air exchange in buildings with high humidity and high loads. The installation of pipes for the supply air and exhaust air and heat recovery is not necessary. Here is the outside air is dehumidified by absorption and is then raised to the desired temperature with heat recovery and direct and indirect evaporative cooling.Normally in a dehumidifying desiccant rotor with silica gel or lithium chloride reaches, but also increasingly liquid desiccant (drying agent: lithium chloride) are being tested. In these systems, solar heat for the regeneration of absorption / adsorption device is required.
A closed-cycle desiccant evaporative cooling systems are on the adsorption process (based on a solid desiccant such as silica gel or zeolites, using water as coolant), or the absorption of(Where are the liquid desiccant. Desiccant material like a pair of lithium bromide and water as a coolant or water as a drying agent and ammonia as a refrigerant, where temperatures below freezing may be required).
Be used for cooling and the acclimatization of buildings, only solar energy-based processes.
In practice, the solar collectors for solar radiation into heat, which then convert comes with a thermally driven refrigeration or air conditioning in a direct process. Particularlyin special applications such as cooling for drugs in remote areas that are not connected to the network, is transformed by a photovoltaic generator of solar radiation, solar energy, which then activates a refrigeration process - usually in the form of a cooling machine compression.
There have been significant developments in the field of solar heating and cooling assistance, and the whole world, this technology is quickly brought to justice and accepted.
Solar thermal World magazine recently reported that in Indialast and probably the largest solar thermal air conditioning continued Muni Seva Ashram-based (MSA) in goraj in Vadodara district of Gujarat state in western India operation is. A total of 100 satellite dishes (Scheffler-type) of the Indian society Gadhia Solar Energy Systems (GSES) - each 12.5 m2 in size - now provide the existing 100-ton air conditioner of the 160-bed hospital to Muni Seva Ashram. [I]
Performance of Solar Air Conditioning
DuringSAC and the design of a system for assessing his performance the most important points to consider are the load profiles, outside temperature and humidity.
The decision of whether it is useful to all solar cooling is strongly influenced by the load profile. Sunlight and cooling requirements must be related, since the use of fossil fuels for operation of the chiller from a negative view of primary energy and should be avoided.
To achieve the highest possible level ofUse should also be applications that require heat for hot water or heating of the hot season for outdoor exploring. YOUR ACCOMMODATION smaller offices and buildings are more suitable. If cooling is required during the year (process cooling, server room) of solar cooling systems can be used for conventional air conditioning only as fuel savers. In this case, directly through the free cooling chiller could be an option in cooler seasons.
HeatRejection rate affects the performance and efficiency of the chiller. In most systems, the heat is released into the environment by cooling towers, dry cooling or wet. The former are in temperate zones, the only time suitable for high temperatures (> 30 ° C). Wet cooling towers have the advantage that the cooling water temperatures can be reached below the ambient temperature. But it works only when the relative humidity can be used for cooling by evaporation. InThe regions with a shortage of water is not suitable. In addition, some countries have strict health requirements of wet cooling towers, which make the operation economically imposed by small plants unprofitable.
It 'important to be aware that conditions other than nominal conditions could have a negative impact on the performance of the chiller. If the system is not designed for the nominal operating point, relevant operational data of the requestManufacturer. Then, for example, a chiller dry cycle inversion are used in hot climates, when the solar system will be adjusted accordingly.
The efficient use of brushless DC in the set SAC helps to reduce energy consumption. To further reduce energy consumption, they should be regulated according to operating conditions and cooling requirements. Depending on the specific local conditions of heat can be rejected in other ways, such as drilling, swimmingPools or groundwater. Ideally, the heat can be used in other places.
The benefits of solar air-conditioning
Compared to conventional compression technology to drive electric cooling, solar cooling has not. Benefits. These systems are particularly useful when the sun shines most - in the summer. The machines usually use the environmentally friendly refrigerant, which results in lower emissions of greenhouse gases. In most cases, water is used in the comparison of refrigerantrefrigeration equipment used in compression, it has a global warming potential. Significant energy savings can be made that these systems require only the power supply for operation of pumps, heat dissipation, etc., when systems are properly designed lead. In addition to cooling, solar energy and thermal energy for heating water and space heating, which leads to a further reduction of emissions. SAC is also ideal for hotels, supermarkets, schools,Factories and large offices, etc. noise emissions are significantly lower than the machines that work without compressors.
Solar systems based on AC may therefore provide a viable alternative to conventional ACs. In addition to drastically reduced or even eliminated the current air conditioning bills, in many regions, you can get a huge discount in cash and a tax credit to transform its air conditioning with air conditioners, solar energy. With immediate effect, the capitalThe investments are high, but the system can justify its value over the long term. It 'just a matter of time that this technology could be mass produced, making the costs to levels affordable for the common man And then, days, maximum cooling demands on the same day in which the maximum energy from the sun could be recovered, while pocketing all the benefits that flow from it. The choice is really our being!
