A solar air cooler works on solar energy. As the name suggests, it uses solar power to meet its energy requirements. Its operational mechanism is different from conventional evaporative air cooler and it better than solar air conditioner. The solar energy from sun is converted into chemical energy and stored in a battery. This battery then acts as the source of power supply for the cooler. Its simple mechanism and economical operation render it as obvious choice for almost everyone. It’s extremely useful for rural areas where there will be no electric supply.
1. Solar Air Cooler’s Working Principle
A solar air cooler makes use of the evaporative cooling mechanism. This is the most cost effective Eco-friendly and efficient cooling method. To understand the basic principle, imagine yourself coming out of the pool in peak summer. When the hot wind touches your body, the water droplets on your skin evaporate. This evaporation leads to reduction of surrounding temperature, thereby making you feel cool and comfortable.
When the cooler’s fan starts operating, outside hot air is sucked inside through the wet curtains (cooling medium). This hot air evaporates the water from the wet pads. The water evaporation reduces the temperature of the air by using up the heat. Therefore, the air blown out by the fan is fresh and cool.
Our in-house produced powerful cooling fans find great utility in several fields like industries, workshops etc. The solar cooler has gained lot of popularity due to its rugged, economical and environment friendly design. It has got an ever increasing demand in the USA, China, Europe, Africa, Middle East, Asia etc.
2 . Solar Cooler VS Air conditioner
In order to compare solar cooler with an air conditioner, we should understand their basic principles. The following sub-paragraphs bring out the working principles and other relevant aspects for these appliances :
Solar evaporative coolers also called Solar swamp coolers are not as widespread as the vapor compression (refrigerant) ACs. But they are a great alternative in hot and dry areas with frequent power hick-ups. The hot and arid air is drawn in by the cooler’s fan. The air passes through the cooling pads which are continuously kept wet with the help of a pump. The hot air evaporates water and thus becomes colder. This colder air then gets circulated in the room by the powerful industrial grade fan. The phenomenon is the same as experienced when you come out of a swimming pool. Even the hot air feels cool as the water droplets on your body evaporate. They can reduce the temperatures of your house or workplace by about 30 degrees.
(b) Heat Pump and Central ACs
Heat pumps and Central ACs are designed for cooling the complete hotel, office establishment or house. In both the types of appliances, there’s a compressor that’s placed outside. While this outdoor component drives the system, the indoor unit having refrigerant filled coil cools down the air. The cold air then passes through ducts to reach various parts of the building. The Central AC can only cool the air, whereas a Heat pump is capable of reversing the cycle. This makes it more versatile as it can be used to heat the air during winters.
(c) Room ACs
The wall mounted or window AC units combine the compressor and the coil inside a single body. While fixing, the compressor is still placed outside while the air handling unit (AHU) comes inside. The operating mechanism is the same as that of a Central AC system. They’re smaller in size with power to cool a single room. Hence, a number of such units are needed for the whole house.
(d) Ductless Mini-Split ACs
The mini-split ACs are popular in many countries and are a good alternative for retrofit cases and duct-less houses. They have the same basic principle as that of a Central AC. The mini-split AC has a single outdoor compressor and may have a number of indoor AHUs. These independent AHUs may be mounted on walls or ceiling and are connected to compressor through conduits. Unlike a Central AC system, each zone or room will need a separate AHU.
While AC seemingly provides fast and effective cooling, it consumes more power and is not good for environment. The evaporative cooling system not only provides comparable cooling, but is much less power hungry. When you combine these advantages with benefits of solar power, the resulting system is a true winner.
3 .What is the solar cooler Advantage and Disadvantages
- It uses solar energy and has minimal running cost.
- It saves electricity and has no carbon footprint, which makes it highly Eco-friendly.
- It’s easy to use and handle with simple design.
- With simple and cheap components, it has very less maintenance expenses.
- It’s initial cost is quite low.
4. Where is the solar cooler application
It can be used in the rural areas where power cut is a problem.
5.What is solar cooler Features
There are numerous benefits of the PMDC motor over its DC counterpart. Five of the major advantages are as under :
- Higher efficiency. Unlike a DC motor, in which electricity is used to maintain a magnetic field, there are no losses in a PM motor. This means that the PMDC motor has a higher efficiency.
- PMDC motor has higher torque power density.
- The motor has more predictable characteristics because of linear torque speed.
- PMDC motor has higher magnetic flux density in the air gap due to its permanent magnet. This enables it to have better dynamic performance.
- Simple design of PMDC makes it easy to maintain.
6.How much do the solar evaporative cooler lower the temperature
Being a solar powered cooler, it’s generally good for all as it saves electricity and is Eco-friendly. However, an evaporative cooling system works best in areas having low relative humidity. It’s known to lower the temperatures to around 20 degrees Celsius. It’s cooling efficiency goes down with increasing relative humidity. You must therefore check the relative humidity of your area during summers before buying it. As a thumb rule, if the air produced is cooler than 70 degrees Fahrenheit, the cooler will be useful. If the air produced is hotter than 75 degree Fahrenheit, it won’t be of much use. 70-75 degrees Fahrenheit is the range in which some people will feel comfortable, whereas, the others may not.
7. What factors affect solar powered cooler temperature
Dry Bulb Temperature (DBT)
Wet Bulb Temperature (WBT)
What is the different between Dry Bulb Temperature and Wet Bulb Temperature?
8.How to Calculate solar air cooler running time
Here our cooler load voltage is 12V and the total wattage is 120.
Battery capacity is 12V, 100Ah
Solar panel is 18V,200 W
Solar cooler running time = Battery current(A)/ Solar panel current(A)
Solar panel current(A) =watt / volt
Time need to charge only by solar=100/(200÷18) = 9 hours
So the solar air cooler running time is 9 hours
Note: Combination of external sources and solar panel will reduce the charging time. (All assumptions are made neglecting all losses)
9.How to Calculate the Payback for solar cooler
Payback is defined as the amount of time in which our product becomes free
Let’s suppose that:
The full set of solar cooler including solar accessories is USD400, We will use 8 hours per day and use 120 days per year,The electricity charge is USD0.15/Kw-hour
If we use air conditioner to cool the space, it will take us 8*120*1*0.15=USD144 per year
We use solar air cooler instead, we will get the money back in 2.78 years (400/144)
It means that after 2 years and 284 days,you will get all your money back and you own the solar air coolers for free after that. Moreover,it will keep saving electricity bills for you after that time.
Note: If we use air conditioner to cool the space instead of solar air cooler,we might need 1 Kw/h electricity
10.Top tips to choose the right solar air cooler brand
Low price, minimal operating costs and cheap maintenance make solar cooler an affordable choice for all. It’s excellent for rural and backward areas where electric supply is not there. It’s a favorite in schools, houses, offices and workplaces in areas of frequent power cuts. It cools down the room temperature to a comfortable 20-25 degrees Celsius with relative humidity of 60%.
For any dealer wishing to buy the coolers in bulk, choosing a manufacturer with the most competitive prices is recommended. Vankool is a superb choice for those in the wholesale business. It is the preferred OEM dealer for Honeywell for the past 12 years.
Vankool who can meet such requirements and will be a good choice when you consider to choose a window swamp coolers manufacture in China. Here 6 more reasons that why Vankool could be a good choice for you:
– Over 12 years experience in the field of evaporative air coolers
– Vankool OEM supplier for Honeywell for more than 12 years.
– Over 5 new air coolers will be designed for customers by ODM service
– With full range of evaporative air cooler products like portable air coolers (residential and commercial), window air cooler, industrial air cooler
– ISO 9000 QC standard will be applied for each order
– Short delivery time for sample order (1-2 days) and bulk order (15-25 days)