Water harvesting for young trees using Peltier modules powered by photovoltaic solar energy
Young trees transplanted from nursery into open field require a minimum amount of soil moisture to successfully root in their new location, especially in dry-climate areas. One possibility is to obtain the required water from air moisture. This can be achieved by reducing the temperature of a surface below the air dew point temperature, inducing water vapor condensation on the surface. The temperature of a surface can be reduced by applying the thermoelectric effect, with Peltier modules powered by electricity. Here, we present a system that generates electricity with a solar photovoltaic module, stores it in a battery, and finally, uses the electricity at the moment in which air humidity and temperature are optimal to maximize water condensation while minimizing energy consumption. Also, a method to reduce the evaporation of the condensed water is proposed. The objective of the system is to sustain young plants in drier periods, rather than exclusively irrigating young plants to boost their growth.
daqb data acquisition board emf electromotive force etc crop evapotranspiration spv solar photovoltaic spvm solar photovoltaic module tdp dew point temperature ts condensing surface temperature hr relative humidity td temperature difference (difference between air temperature and condensing surface temperature) ta air temperature