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Questions tagged [hvac]

Questions about air heating, ventilation, and conditioning, including indoor air quality (IAQ).

131 questions
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Why home Air Conditioning AC compressor insulated

Compressor is hot due to gas compression, and the gas then cooled in condenser. AC installed in tropical climate. Why compressor have insulation barrier?
RainerJ
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1 answer

Nitrogen purging via outdoor unit: Gas not going thru?

I'm installing a new Daikin 4MXL (36K BTU) outdoor compressor, with 24K and 9K indoor unit (I previously installed a smaller dual zone Daikin) One of new indoor unit's lineset will be behind drywall, so I cut off flare joints and to solder on…
clearlight
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Air handling unit design

I am currently developing an AHU for all weather conditions. I need the design process for calculating coil capacity and air discharge rate. Issue is that, while plotting the process on psychrometric chart, you can give only 1 outside air…
SohamD
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What would be the disadvantage if any to placing evaporator casement beneath furnace for central forced air HVAC sustem?

I have only been in the HVAC business for 3 years and I have already encountered 2 cases of leaking air conditioning evaporators. In both cases the evaporators were located above the central furnace in an up-flow forced air system. My diagnosis is…
0tyranny0poverty
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How much additional heat does sunlight add to a building? (estimate)

I'm adding air conditioning units the the second floor (UK) of a manor house, and estimating the output needed for AC units. I know the heat gain from walls, window, and roof, as I know the U-values of these surfaces, comparing the temp inside and…
Asher Benter
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Air conditioner efficiency?

So I've been learning a lot about latent heat, and how the refrigerant is actually based on this concept. Just like dissolving water into air converts sensible heat into latent heat, spitting out liquid refringent into vacuum, converts sensible heat…
user2656801
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How to measure velocity of hot gas ( temperature range: 100 - 450 ºC)?

I want to measure the velocity of hot gas coming out from an incinerator. The temperature can easily shoot upto 400-500ºC. I've checked online for hot-wire anemometers, even they claim to work in the range of 0-50 ºC or 0-70ºC. Moreover they are…
megamindx
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Static Pressure of non-ducted fan

Is 0.0 the appropriate external static pressure to use when sizing a high flow exhaust fan that is not ducted on either the inlet or outlet? I can't find any specific guidance on this practice, yet I'm reluctant to assume 0.0 due to friction…
Secundus
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