Abstract
Despite of the fact that Earth’s atmosphere has abundant freshwater inform of moisture, water scarcity is one of the crucial problems especially in humid, hot, and drought prone regions. The conventional systems which extracts atmospheric water are very bulky, incompatible with the existing system, energy intensive, impractical, low water yield and expensive. These adverse effects hinder their deployment for large scale applications. In this manuscript, a water harvesting device is deigned and fabricated for extracting water from moist air. The device uses vertical copper pipes entrenched in horizontal Al fins as the condensing surfaces. All the components of the device functions on solar powered energy. The proposed device is environment friendly, compact, lightweight, low manufacturing, and maintenance cost. The device generate water with turbidity of 40 PPM. Results shows that condensation rates strongly depend on the relative humidity, saturation temperature of the moist air, and degree of subcooling. In this device, the cost of water is estimated as Rs. 10 per liter. This device is efficient for providing drinkable water in hot and humid, water scare regions globally.
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Abbreviations
- A :
-
Cross-sectional area of rectangular duct (mm2)
- \(\bar{C}\) :
-
Cost of solar energy in India (Rs.)
- C :
-
Cost of producing 1Â L of water from the proposed device (Rs.)
- C p :
-
Specific heat capacity (J/kg K)
- dp:
-
Total pressure increased in the fan (N/m2)
- ΔT:
-
Degree of subcooling (℃)
- E total :
-
Total energy requirements of the device (kWh)
- m :
-
Condensation rate (l/h)
- m cond :
-
Amount of condensed water collected during the experiment (l)
- \(\dot{m}\) :
-
Mass flow rate of water-cooling unit (kg/s)
- M a :
-
Mass of air (28.963Â kg/Kmol),
- M v :
-
Mass of water vapor (18.02Â kg/Kmol),
- N max :
-
RPM of the fan at maximum speed
- N req :
-
RPM of the fan at required speed
- P 0 :
-
Total atmospheric pressure (bar)
- P fan :
-
Power requirement of fan modules (kW)
- P sat :
-
Pressure corresponding to saturation temperature (bar)
- P total :
-
Total energy requirement of the water harvesting device (kW)
- P WC :
-
Power requirement of water-cooling unit (kW)
- Q N :
-
Flow rate of moist air at the required speed (m3/s)
- Q max :
-
Flow rate of moist air at the maximum speed (m3/s)
- RH:
-
Relative humidity (%)
- t :
-
Total time of condensation experiment (hours)
- T :
-
Moist air temperature (℃)
- V max :
-
Maximum speed (m/s)
- a:
-
Properties of dry air
- m:
-
Properties of moist air
- v:
-
Properties of water vapor
- w:
-
Properties of water
- CFM:
-
Cubic feet per minute
- PPM:
-
Parts per million
- RPM:
-
Revolutions per minute
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Acknowledgements
The authors acknowledge the financial support from Science and Engineering Research Board (SERB), Department of Science and Technology (DST), Govt. of India (Project No. ECR/2016/000020).
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Baghel, V., Sikarwar, B.S. (2021). Performance Investigation of Atmospheric Water Generating Device for Hot and Humid Conditions. In: Sikarwar, B.S., Sundén, B., Wang, Q. (eds) Advances in Fluid and Thermal Engineering. Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-16-0159-0_4
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