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This section will first let you download an Excel calculator. Then, we'll quickly brief through what is RTS and how's the RTS procedure. A few key elements of the RTS method will be pointed out to give you an overview of the calculation process.
In this section, we'll calculate how much solar energy is present at a specific design month and time. With that, we can calculate the solar energy actually hitting on these surfaces. Then, we'll follow the RTS method to apply the appropriate CTS and RTS factors to calculate the cooling load from these surfaces.
Windows and doors have a different calculation than walls and roofs. So, in this section, we'll calculate three solar heat gains and then convert them into cooling load. We'll take into account any blinds and overhang shades that might reduce the cooling load.
In this section, we'll calculate the cooling load due to internal heat gains. We'll break them into sensible and latent load. The usage profile and diversity factor will be demonstrated here and for equipment, we'll also account the heat gains from appliances in standby mode. The heat gain of various types of equipment will also be provided.
In this section, you'll know how to use the Excel calculator and add more tabs to account for more surfaces. As a summary/conclusion, I'll show you an example of how to plot a 24 hours load profile and identify the peak cooling load for equipment sizing.
"Very good course, explanations were very good and matched the excel calculator spreadsheet."
"As a young mechanical engineer in HVAC, I can say that this course was very thorough and straight to the point. The Excel Calculator is easy to use and goes into a lot of detail. After completing this course, I now have better understanding of the RTS method, and I am now more familiar with ASHRAE data and how to use it effectively. I will surely utilize this calculator and Mr. Yu's teachings in future design projects."
More and more buildings are heading towards a greener and more energy efficient design. Thus, the traditional rule of thumb method (btu/hr/sqft) is getting unacceptable as it simply can't provide enough information for us to analyze and optimize the cooling load in the effort to save energy and cost. That's why I think being able to perform proper cooling load calculations is important as it'll put us in a better position for job opportunity, career advancement and professional development. If you're into design, I definitely recommend you learn this skill as soon as possible.
or join the Pro Plan at $20/mo or $220/yr.
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