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two different terminology with different legal explanation.

the first highlight the reduction of equivalent CO2 impact of a specific refrigerant, but never reach Zero.

phase out, volume...

manufacturer could discuss that, but it will not stop any water carry over (A or V coils), as long the system is down flow.
portion of the coils will still be extended beyond the coil boundaries and...

never come with such kit. it would be interesting to know how it will stop water carry over in down flow air flow system.

any video?

with the benifits of V-shaped evaporator coil, compact size.
but still the serious problem of water dripping out of the drain pan is not solved. (for Down flow machines)

seen it in many...

true,

projects usually do have design review, standard compliance verification, load calculation, system upgrade analysis, ... etc. all can be done in office.

but for existing projects...

All great ideas,

I think HVAC engineer can provide consultation and design review, or analysis report study…

Sometimes also operation optimization to insure energy and cost efficiency when...

changing to an A2L refrigerant require using an A2L rated and complying electrical component (breaker, contactors, ...)

what logos or symbols identifies such A2L compliance component?

hi

with today online activity became more common. in all fields and aspect almost. what could be related to our HVAC industry?

what services an HVAC technician can provide online?
what...

for the new alternative refrigerant. some asked me wither their will be a capacity lose with the new refrigerant?

its not easy simple answer like what used to be in the past alternatives scenarios...

recommend it for all beginners and juniors in refrigeration and air conditioning

can be found all in bellow e-learning link

https://hvacr.elearn.network/

interesting idea to study.. thanks

i have an idea for water dispensers

but looking for open drive rotary compressor small size.

any suggestions where can i find such compressor?

i am a mfg
screw with vfd, i have done it once. the cost of chiller like 15% more. for no big reason.

the sliding valve will save energy if compressor start unloading and work in partial...

which design would be more helpful for energy saving in chiller operation?

a chiller with screw compressor using sliding valve to modulate the flow rate according to real load, (unloading the...

dont forget to check the electrical components if still fit or need to oversize also.
the oversized compressor will consume more power and ampere.. make sure the installed...

How much oversized?

It can be fine, but you need to observe the system reading and some extra refrigerant is needed.

Power consumption will be increased, also delivered capacity will increase....

Hi

To help the new comers to HVAC business, I think they we can help them by introducing them to market required certifications and license.

Professional folks; your feedbacks. If license...

What exactly the issues you have so we can help?

hermetic compressors usually coming with oil sight glass. (very small capacity for few and fractional horse power dont).
for small sized compressor no worries about the oil immigrating in the...

plug fan can be for high static application if constructed with heavy thick steel. . i saw it with twin city plug fan.
and other plug fan are made of plastic used for low and medium static...

yah, thanks... there was my mistake.
i didn't notice he is using this method for resistive load only (electric resistive heater).

thanks

hi.
i have seen a YouTube video about how to find out the actual CFM of a unit installed and running. at the beginning it was showing nice a great calculation formulas. but then i get confused when...

Hi everyone.

retrofitting from refrigerant to another is very demanding in the last few years. but questions arises from users and maintenance guy's about capacity loose and the new working...

i thought lowering CFM will only change on the off-coil temperature and will be more close to the coil ADP temperature.(and the evaporator temp will remain unchanged).

but now it turn out that my...

a question:
considering we have a two HVAC units (same model) working on the same conditions (the same ambient temperature/same on-coil temperature).

with only one difference, the CFM not same...

hey all.

first excuse my language (not native English speaker).

i an learning about the HVAC and i am now understanding the principles behind "suction temperature" and "discharge temperature"...

Hi

usually when we talk about the indoor unit (AHU or FCU), it have two main components, the evaporator coil and the supply fan.

what the effect on off-coil temperature (dry-bulb , humidity...

dears
just wondering if there is any instant chanting application like the old yahoo messenger app. it was a greet and useful application.

thanks

dears

hope your help in understanding the difference between the ideal and real cooling curve on psychrometric chart.

what the reason behind their difference?
why the dehumidification start...

thanks knave

this is something new for me. thanks for the info. this is called the evaporator approach, right?

why 35F lower than the return air temp?
what will happen if higher or lower...

thanks

in the refrigerant to air approach temperature, it should be the off-coil air temperature.. right?

and the same concept applies here, the closer saturated refrigerant temperature to air...

dears, i am new in HVAC and trying to practice it.

am reading about condenser and evaporator temperature approach.

is it only terms used for chillers? or for rooftop package units also?
how to...

i am new in the field and practicing the HVAC system.

the evaporator approach temperature, is it only a term used for Chillers?

in case of package roof top units, can we say evaporator approach...

thanks to all

i am practicing the HVAC and trying to master it.

can you advise me for some topics to read it about the dry/wet coils?

also the evaporator coil, is it related to indoor load...

dears

wet/dry coils.. is this also something related to over/under sizing the evaporator coil?

what impact of having bigger or smaller coil for the same compressor and condenser size outdoor...

some real life example, find bellow:

ambient: 125F
supply fan air flow rate: 9575 CFM
Entering dry bulb temperature: 80.20F
entering wet bulb temperature: 63.70F
ent. enthalpy: 28.91 Btu/lb...

thanks my friend

sure my formula in first method only about sensible heat cooling capacity . while the formula in the second method for total cooling capacity.

so by sense, the final result...

hi everybody,

i am trying to practice the roof top unit (RTU) cooling output calculation (to master it). using two methods

first method:
- first i am finding the temperature change across the...

thanks you all for your perfect contribution you add, its all of greet help to me.

what i had in mind for condensing temperature is how much higher should i keep it from the ambient temperature...

hi friends.

i am studying the HVAC system and trying to completely visualize the working condition for refrigerant throw out all process

in the condenser coil the gas will condense at the...