Hot Gas Reheat vs. Hot Gas Bypass - What's The Difference?
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- Опубликовано: 15 фев 2020
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In this video, we discuss the difference between Hot Gas Bypass and Hot Gas Reheat. Two HVAC industry terms that are commonly misunderstood.
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Video Description:
HOT GAS REHEAT uses the high pressure, high temperature, compressor discharge gas to reheat the air leaving the evaporator coil. This is achieved by running the gas through a hot gas reheat coil using hot gas reheat valves. Hot gas reheat is typically used in dehumidification modes to meet the desired space sensible temperature set point.
Modulating hot gas reheat, the more advanced form of reheat, allows us to precisely control the HVAC system leaving air temperature. As opposed to the older style electric reheat, which works well but wastes a lot of energy. Advances in HVAC controls and technology in HVAC systems over the years have made hot gas reheat very popular.
HOT GAS BYPASS provides an artificial load on the evaporator by introducing a portion of high pressure, high-temperature gas to the evaporator/suction side of the system. An inexpensive and simple way to keep the HVAC system running without freezing the coil but a huge energy waster. The hot gas bypass valve is old technology used on a limited basis today quickly being replaces by modulating compressors or variable capacity compressors.
Thank you for watching and please let me know if you have any questions!
This was greatly explained! I was expecting to go through at least 3 videos. This did the job.
Thank you for your presentation
Installed a 3-5 bosch heat pump on a pharmaceutical place and since it was mt first time working at a commercial building, i was stumped on why none of the rooms would get below 72, thought about it for like 3 hours and found that reheat coils were cuasing this, the rooms eventually got really cold but gotta go out and learn to adjust these coils. Residential installer for 1.5 years and service tech for 2 months
Thanks for commenting!!
Great job, Tony.
Hey Tony, great presentation. Do you ever recommend hot gas reheat on multi-zone VAV RTUs? I can't quite understand how these two control sequences would work together in harmony.
Thanks for the comment. To answer your question, it depends. I have provided hot gas reheat only a few times on multizone VAV systems. Typically when there are only a few zones and lots of OA. Other than that rarely needed for mutlizone VAV in my opinion. thanks!
Thanks Tony , can you refer me to reheat controller ?
Would you say that both systems presented can control Humidity?