troubles that could occur due to interactions between process solutions and membranes. 9. Probability of combining membrane processes with other separation process (hybrid system). 10. Easy scale-up with no requirements of additives. The main disadvantage of MD process is [Teoh and Chung, 2009, Alcheikhhamdon et al., 2015](4): 1. Low permeate flow rate. 2. Membrane fouling and membrane pore wetting 3. Long term performance. 4. Uncertain economics and energy costs. 5. Mass transfer resistance due
savings (Saving Electricity). It uses 298 kWh per month and costs $48 if used 24 hours a day, while a medium window unit AC uses 670 kWh per month and costs $107 if used 24 hours a day (Learn How Much It Costs to Install an AC Unit). Another important advantage of evaporative coolers is that it does not use chlorofluorocarbon(CFC) and hydrochlorofluorocarbon, so no greenhouse gases is
INTRODUCTION As the country’s population growth rate increase they need to develop their economy in this power world. Energy is one of the basic ingredients required to elevate poverty and socio economic development and energy is an important development of country .today a country can only finish its economy by its power equipment’s and machineries which are working safely if the power continuity is widely available. Pakistan has been facing an unprecedent energy crisis since the last several years
harvested when main crops starts growing. Component crops should have similar agronomic practices. Erect growing crops must be intercropped with cover crops like pulses. These will check the weeds and reduce soil erosion. The losses of water due to evaporation are also will be reduced. The component crops should have different root depths for minimize competition for nutrients, water and root respiration. The most common goal of intercropping is to produce a greater yield on a given piece of land by making
a diode ?D?. The major advantage of the circuit is its simplicity, however the output voltage has high ripple. The capacitor is charged during the negative half cycles to the peak a.c. input voltage. The output is the summation of the input a.c. waveform ?v? and the d.c. voltage of the capacitor. The transformer ?T? in the diagram can be used to step up the input voltage. Consequently, the d.c value of the circuit is shifted above. The peak-to-peak ripple is the disadvantage of this circuit and cannot