What is the minimum desired return water temperature for a noncondensing boiler?
Select one:
A. At least 100°F returning to the boiler
B. At least 180°F returning to the boiler
C. At least 140°F returning to the boiler
D. At least 80°F returning to the boiler
Answer (2)
The question requires identifying the minimum return water temperature for a noncondensing boiler.
The minimum desired return water temperature to prevent condensation and corrosion is 140°F.
Option C, 'At least 140°F returning to the boiler', is the correct answer.
Therefore, the minimum desired return water temperature for a noncondensing boiler is \boxed{At\ least\ 140°F}.
Explanation
Understanding the Question The question asks about the minimum desired return water temperature for a noncondensing boiler. We need to select the correct temperature from the given options.
Determining the Correct Temperature The minimum desired return water temperature for a noncondensing boiler is typically at least 140°F. This is to prevent condensation of flue gases within the boiler, which can lead to corrosion and reduced efficiency.
Selecting the Correct Option Comparing the options with the determined temperature, we find that option C, 'At least 140°F returning to the boiler', matches the minimum desired return water temperature.
Final Answer Therefore, the minimum desired return water temperature for a noncondensing boiler is at least 140°F.
Examples
Understanding the minimum return water temperature for a noncondensing boiler is crucial in HVAC system design and maintenance. For example, if a boiler system consistently operates with return water temperatures below 140°F, it can lead to condensation of acidic flue gases. This condensation can corrode the boiler's heat exchanger, reducing its lifespan and efficiency. Regular monitoring and adjustments to maintain the correct return water temperature can prevent costly repairs and ensure optimal boiler performance, saving energy and resources.
The minimum desired return water temperature for a noncondensing boiler is at least 140°F. This temperature helps prevent condensation and related corrosion issues within the boiler. Therefore, the correct answer is option C, 'At least 140°F returning to the boiler'.
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