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PPORTUNITY |
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Welcome to PPORTUNITY, a monthly newsletter provided by Jacco & Associates. Jacco’s focus on engineering and design concepts will improve your HVAC system while significantly reducing design time, making you more productive for your clients. |
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Question: To provide 70º air at 50% RH in a reheat system, what is the required coil discharge temperature (DB/WB)? a.) 65/65 b.) 60/60 c.) 55/55 d.) 50/50
Prize: Ping Putter!
Respond by September 10th with the correct answer to be entered in the raffle for this month’s prize! |
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61 Milford Dr. Hudson, OH 44236 Phone:(330) 463-0100 Fax:(330) 463-0101 |
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The most common way to dehumidify a space is to condense moisture on a cold surface. We often see this accomplished in mechanical equipment with cooling coils. One side affect is overcooling the space to achieve the desired humidity levels. In order to combat this, reheat coils are installed to eliminate over-cooling while still dehumidifying the air. With a typical on-off compressor and reheat coil both your temperature and humidity levels will fluctuate as the system cycles on and off. See Figure 1 below. To maintain temperature control in the space, add a modulating hot gas reheat coil. This allows you to cool and dehumidify the air, then reheat it to the necessary temperature. As you can see in Figure 2 the temperature line has now stabilized, but the humidity still fluctuates as the compressors turn on and off. For complete control of the temperature and humidity of the space add a modulating compressor with a modulating reheat coil. This will continually dehumidify the air to a proper level, and then reheat it to the desired leaving air temperature. You can see in Figure 3 that both lines have now stabilized and control of the space has been accomplished. At the same time that you gain control of your space, you also have a more efficient system. The EER’s of the unit increases with the use of a modulating compressor (see Figure 4), especially at part load which represents the majority of time the system will run. This provides a win-win situation for everyone. Complete control of your space, with a more efficient system. |
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Dehumidification With Modulating Compressors and Reheat Coils |
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Question: Aaon’s standard paint surpasses the 2,500 hour salt spray test. How many hours has the polymer e-coating surpassed? Answer: 6000. Congratulation to Dan Stecklow for winning a Taylor Made R7 Draw Hybrid Rescue Driver! |
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Be sure to mark your calendars for Jacco’s Hospital and Healthcare Seminar on October 20th! Details to follow. |
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FIGURE 1 |
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FIGURE 2 |
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FIGURE 3 |
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FIGURE 4 |