221 lines
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221 lines
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mhoush: Pounds of Water Removed
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<h1>
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Pounds of Water Removed
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</h1>
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<div class="-mt-6">
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<div class="text-gray gray-links text-sm">
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<span class="border-r border-gray pr-2 mr-2">September 08, 2023</span>381 words, posted in <a href="/articles/tag/hvac/">HVAC</a>, <a href="/articles/tag/formulas/">formulas</a>, <a href="/articles/tag/psychrometric-chart/">psychrometric-chart</a>, <a href="/articles/tag/psychrometrics/">psychrometrics</a> and <a href="/articles/tag/tech-tip/">tech-tip</a>
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<img alt="banner" src="http://localhost:3000/articles/images/2023-09-08-pounds-of-water-removed.png"/>
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<p>This is an article that shows how to calculate the pounds of water removed from an air stream, given the entering conditions (return air
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stream) and the outlet conditions (supply air stream).</p>
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<p>This is useful in the field when you want to calculate the amount of moisture removed from an air-conditioner or a dehumidifier. This
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article assumes that you have knowledge of a psychrometric chart. If you do not have basic knowledge of the psychrometric chart, then here
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are a couple articles to familiarize yourself.</p>
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<h2>Articles</h2>
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<ul>
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<li><a href="https://hvacrschool.com/understand-dew-point-absolute-moisture-right-side-psych-chart/">Understand Dew-Point</a></li>
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<li><a href="https://hvacrschool.com/the-impact-of-adding-or-removing-water-from-air/">Impact of Adding or Removing Water from Air</a></li>
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</ul>
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<h2>Scenario</h2>
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<p>Let’s imagine that we have an air-conditioner that has the following measurements taken:</p>
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<ul>
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<li>Return Air: 75° / 50% RH</li>
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<li>Supply Air: 55° / 81% RH</li>
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</ul>
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<p>We plot the two values on the psychrometric chart (black line represents the return air conditions and blue line represents the supply air
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conditions).</p>
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<p><img src="/articles/images/2023-09-08-pounds-of-water-removed.png" alt="chart" /></p>
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<p>We start by finding the corresponding dry-bulb temperature at the bottom of the chart and draw a straight line up to where it intersects the
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relative humidity curve. After that we draw a straight line to the right side of the psychrometric chart to find the grains of moisture per
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pound of air.</p>
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<p>This gives us the following values:</p>
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<ul>
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<li>Return Air: 66 gr/lb</li>
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<li>Supply Air: 52 gr/lb</li>
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</ul>
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<p>We can then use the following formula to calculate the pounds of water removed.</p>
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<p><img src="/articles/images/2023-09-08-formula.png" alt="formula" /></p>
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<table>
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<thead>
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<tr>
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<th><strong>Where</strong></th>
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<th></th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td><strong>W</strong></td>
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<td><em>Weight of water in pounds per hour</em></td>
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</tr>
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<tr>
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<td><strong>4.5</strong></td>
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<td><em>Constant based on density / specific heat of moist air</em></td>
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</tr>
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<tr>
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<td><strong>CFM</strong></td>
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<td><em>Airflow in cubic feet per minute</em></td>
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</tr>
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<tr>
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<td><strong>∆G</strong></td>
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<td><em>Difference in grains of moisture</em></td>
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</tr>
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<tr>
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<td><strong>7000</strong></td>
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<td><em>Constant based on grains of moisture in saturated air</em></td>
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</tr>
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</tbody>
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</table>
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<h2>Solution</h2>
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<p>First, we solve for the difference in grains between the two air streams.</p>
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<p>∆G = 66 - 52 = 14</p>
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<p>Next, we’ve measured our airflow and have determined to have <strong>797 CFM</strong> of airflow across the evaporator coil, so we can substitute our
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values into the formula.</p>
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<p><img src="/articles/images/2023-09-08-solution.png" alt="solution" /></p>
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<p>So, we are removing about 7 pounds of water per hour at these conditions.</p>
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<p>Another thing to note is that 1 pound of water is approximately 1 pint of water, which can be useful when working with dehumidifiers that
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can often be rated in pints per day.</p>
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<p>I hope you’ve found this article helpful, thanks for reading!</p>
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</article>
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<h2 class="text-4xl font-extrabold mb-8">
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Written by
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<div class="prose">
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<h3 class="!m-0">
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Michael Housh
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</h3>
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<p class="text-gray">
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HVAC business owner with over 27 years of experience. Writes articles about HVAC,
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Programming, Home-Performance, and Building Science
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</p>
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</div>
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</div>
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<div class="mt-16">
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<h2 class="text-4xl font-extrabold mb-8">
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More articles
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<h2 class="text-2xl font-bold mb-2">
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<a class="[&:hover]:border-b border-orange" href="/articles/2025/vapor-htmx-todo-app/">Vapor + HTMX</a>
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</h2>
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<div class="text-gray gray-links text-sm mb-4">
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<span class="border-r border-gray pr-2 mr-2">January 05, 2025</span><a href="/articles/tag/general/">general</a>, <a href="/articles/tag/programming/">programming</a> and <a href="/articles/tag/software/">software</a>
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</div>
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<p>
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<a href="/articles/2025/vapor-htmx-todo-app/"><div>
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Build an example application using Vapor and HTMX.
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</div></a>
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</p>
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</section>
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<section>
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<h2 class="text-2xl font-bold mb-2">
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<a class="[&:hover]:border-b border-orange" href="/articles/2024/free-as-in-freedom/">Free As In Freedom</a>
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</h2>
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<div class="text-gray gray-links text-sm mb-4">
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<span class="border-r border-gray pr-2 mr-2">April 09, 2024</span><a href="/articles/tag/general/">general</a>, <a href="/articles/tag/open-source/">open-source</a> and <a href="/articles/tag/software/">software</a>
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</div>
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<p>
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<a href="/articles/2024/free-as-in-freedom/"><div>
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Salute to open-source software engineers
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</div></a>
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<a href="/articles/">› See all articles</a>
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