(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

In a solar water heater, energy from the Sun is gathered by water that circulates through tubes in a rooftop collector. The solar radiation enters the collector through a transparent cover and warms the water in the tubes; this water is pumped into a holding tank. Assume that the efficiency of the overall system is 14.0% (that is, 86% of the incident solar energy is lost from the system). What collector area is necessary to raise the temperature of 250 L of water in the tank from 21°C to 46°C in 1.6 h when the intensity of incident sunlight is 650 W/m2? The specific heat of water is 4186 J/kg·K. The density of water is 1.00 g/cm3.

2. Relevant equations

equations that i used or tried to use were the energy equation where

E=Q-W

and Q=cmT

and W=pdv

3. The attempt at a solution

i dont know what the pressure of the object is....unless my method is wrong

i also tried the equation with 0.14E because its 14% of the energy

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# Homework Help: Solar Energy problem

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