Air Change
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The Digital Scroll Compressor - Improved Capacity Control But Is There a Downside?
The digital scroll compressor is a form of scroll compressor commonly used in commercial air conditioners. It uses an unloading mechanism to provide a form of capacity control.
In this video we will cover the digital scroll compressor and its pros and cons. In the next video of this series, we will cover the inverter scroll compressor for comparison.
The aim of these videos is to help HVAC engineers make more informed decisions when choosing air conditioning equipment.
Links to academic studies that plotted the efficiency of the digital scroll compressor:
docs.lib.purdue.edu/cgi/viewcontent.cgi?article=2671&context=icec
docplayer.net/15274978-Development-and-testing-of-a-multi-type-air-conditioner-without-using-ac-inverters.html
zhlédnutí: 14 742

Video

The Scroll Compressor - Basics & The Fixed Speed Type
zhlédnutí 28KPřed 3 lety
Scroll compressors are the most common type of compressor used in commercial air conditioners. But there are sub types of the scroll compressor which can make things a bit confusing. In this video we will cover the basic operating principle of the scroll compressor and the pros and cons of the fixed speed type. In the next two videos we will discuss the digital scroll compressor and the inverte...
Return Air Bypass Mode For ERV & HRV Units - Demand Controlled Ventilation
zhlédnutí 4KPřed 3 lety
Return Air Bypass is another ERV or HRV unit mode that involves a form of heat exchanger bypass. Its function is quite different to economy cycle mode though, so it is important to understand the difference. In this video we explain Return Air Bypass Mode and how it can further miminise energy consumption by matching ventilation rates with demand.
Economy Cycle Mode for ERV & HRV Units
zhlédnutí 2,8KPřed 3 lety
At Air Change we often get asked how economy cycle mode works with Energy Recovery Ventilators or Heat Recovery Ventilators units. So in this video we will explain it! In our previous video, we covered how ERV & HRV units minimise an outside air load by transferring heat, or energy, between air being exhausted outside and fresh air being supplied inside. Despite saving large amounts of energy s...
ERV & HRV Units Explained
zhlédnutí 121KPřed 3 lety
Energy Recovery Ventilators & Heat Recovery Ventilators explained - what they are used for and how they work. Buildings need fresh air for indoor air quality. But introducing fresh air comes with an energy penalty. This is where ERV & HRV units help.
Low Dew Point Refrigeration Systems for Dehumidification
zhlédnutí 1,4KPřed 3 lety
Air Change ACDHUM and Precise Control Units can incorporate Low Dew Point DX Refrigeration Systems for dehumidifying air to particularly low moisture contents. In this video we explain how Low Dew Point DX systems work, and how they provide a simple solution for humidity sensitive HVAC projects.
Hybrid CHW & DX Cooling Systems Part 2: Improving Chiller Operating Efficiency
zhlédnutí 2,9KPřed 3 lety
Air Change Precise Control Units can incorporate chilled water coils alongside DX refrigeration to form a hybrid cooling system. In this video, Part 2 of Hybrid Chilled Water and DX Cooling Systems, we will cover how hybrid PCUs can save energy by improving the efficiency of chillers, particularly those that are operating in humid climates. If you haven't seen the Part 1 video, make sure you ch...
Combined Pool Water Heating & Air Handling for Large Energy Savings!
zhlédnutí 3,5KPřed 3 lety
Indoor pools are great fun. And the provide us with a means of exercise contributing to our health and wellbeing. But to say indoor pools are energy demanding is an understatement. The pool water heating, the indoor air temperature control, and the high ventilation rates all consume large amounts of energy! The Air Change Poolpac has long been regarded as the go to solution for delivering effic...
Hybrid CHW & DX Cooling Systems Part 1
zhlédnutí 6KPřed 3 lety
Air Change Precise Control Units can incorporate chilled water coils alongside DX refrigeration systems to form a hybrid cooling system. In this video, part 1 of hybrid cooling systems, we will go over the basic operating principle of hybrid Precise Control Units and how they can help CHW cooling systems perform better in humid climates. Learn more about our PCU ranger here: www.airchange.com.a...
Dehumidification & Humidification Combined
zhlédnutí 4,2KPřed 3 lety
Air Change DOAS & Dehumidification units can incorporate humidifiers for complete indoor humidity control. Humidification in HVAC design is likely to grow in importance, as numerous health studies have found that low humidity levels seem to increase the transmission of viruses. Air Change combined humidification units simplify site installation as separate pieces of equipment are not needed for...
The Art of the Chart, Part 1 - A Guide to the Psychrometric Chart
zhlédnutí 696Před 3 lety
The Art of the Chart, Part 1 - A Guide to the Psychrometric Chart and how it Makes the Invisible Visible. Dry bulb temperature, wet bulb temperature, relative humidity and humidity ratio are covered in this video. Some HVAC engineers may find the psychrometric chart to be a bit daunting or confusing. Or maybe they have a good understanding of it but see it as a non-essential tool. Well, in this...
Split Make-Up Air (SMA) Explainer Video
zhlédnutí 1,3KPřed 4 lety
Air Change SMA units supply dehumidified make-up air in an energy efficient manner. SMA units can also help VRF systems perform better in humid climates. Learn more about our SMA range here: www.airchange.com.au/cms/?product=split-make-up-unit
Precise Control Unit (PCU) Explainer Video
zhlédnutí 2,5KPřed 4 lety
Designing effective HVAC systems for humidity control can be challenging. Because of this, Air Change developed the Precise Control Unit range of dehumidifiers to help HVAC engineers implement the simplest and most reliable solution for humidity control. Air Change PCU - precise temperature and humidity control for any application. Learn more about our PCU range here: www.airchange.com.au/cms/?...

Komentáře

  • @user-kp6ee6wv1b
    @user-kp6ee6wv1b Před 6 dny

    What about in a commercial situation where tons of humidity is created indoors that needs removed/exhausted. but also the area needs climatized.

  • @chetmyers7041
    @chetmyers7041 Před 17 dny

    Please delete background music in future videos. I will turn on my radio if I desire background distractions.

  • @bryananderson3787
    @bryananderson3787 Před 26 dny

    What would be the result/symptom if the solenoid were to get stuck in the open(unloading) position?

  • @IvoPavlik
    @IvoPavlik Před 28 dny

    Came because of info Ran away because of music

  • @user-sv8fi4kn4h
    @user-sv8fi4kn4h Před měsícem

    waiting for part 2

  • @Sunxfan
    @Sunxfan Před 2 měsíci

    GOOD,IS IT USE EC CENTRIFUGAL FAN ?

  • @sighpocket5
    @sighpocket5 Před 2 měsíci

    Nice!!!!!!

  • @RavarsenBlogspot
    @RavarsenBlogspot Před 3 měsíci

    Why is this not more commonly known

  • @TinaWavelet
    @TinaWavelet Před 3 měsíci

    Thanks god captions exist, i had to turn the volume down coz of background music

  • @TinaWavelet
    @TinaWavelet Před 3 měsíci

    When will people learn not to use any background music in educational videos?

  • @shepherdboy9692
    @shepherdboy9692 Před 5 měsíci

    QUESTION: I am designing a house to build in Canada, so heating and cooling are necessary. I know an ERV is code and also good for air/humidity quality and health. If I were to choose a forced air furnace, would that be a completely separate set of duct work than the ERV? That would be a lot of duct work. With installing an ERV, what is the best whole-home cooling option? I'd be happy with hydronic radiant in-floor heating... but I also want whole-home AC and my design is not conducive to mini-split wall mounted heat pumps. So if I do a ducted forced-air heat pump... will that be a separate set of duct work from the ERV?

  • @GaddarKerim1
    @GaddarKerim1 Před 5 měsíci

    How does ERV remove moisture?

  • @malludxb2019
    @malludxb2019 Před 6 měsíci

    So what is the diffrence compre with FAHU

  • @ernestoc36921
    @ernestoc36921 Před 6 měsíci

    Could you please turn up the music? I can still hear the narrator

  • @DrLachlanFetterplace
    @DrLachlanFetterplace Před 7 měsíci

    Great video. Really clear explanation. One question: So with the ERV - is there some air exchange or how does the humidity get exchanged? If there is air exchange how to you clean exhaust air before (or after) it mixes, as it will have high co2 and airbourne virus particles etc? With a HEPA filter or similar for virus's? That won't scrub the co2 though will it?

    • @DragonsWrath886
      @DragonsWrath886 Před 7 měsíci

      This other video explains it better ( czcams.com/video/QOSelUK6dpQ/video.html ) but the material in the exchanger will be different. in an HRV where only heat is exchanged, the material will be metal, while an ERV may have a a cloth-like material (or silica?) that will wick away humidity from one air stream and will be picked up by the other. For the other question - filters. CO2 shouldn't be a concern since you're only exchanging heat. The exhaust air is still exhausted, unless you're using a system that returns some portion of the exhaust air, in which case you'd limit that return air accordingly.

  • @minitrekjatim
    @minitrekjatim Před 7 měsíci

    Saya kesini setelah lihat komen om joy di chanel sebelah, masih terkait matic...mantep tips2nya, terutama pas nyimak alasan kenapa jangan sering pindah dari D N DN😊

  • @f.osborn1579
    @f.osborn1579 Před rokem

    Thanks!

  • @baijopaul
    @baijopaul Před rokem

    Any option to use in Church ? What about the cost factors ?

  • @zeeshanshah1573
    @zeeshanshah1573 Před rokem

    Is there a 4000 cfm of fresh air i can get in with this

    • @hottubking1229
      @hottubking1229 Před 5 měsíci

      Yikes, are you trying to ventilate an apartment block?

  • @boatnoy
    @boatnoy Před rokem

    Such a great content. Underrated

  • @vikican
    @vikican Před rokem

    Annoying music, gave up watching this shit.

  • @nuvo-gq9iu
    @nuvo-gq9iu Před rokem

    If I'm in a house and I find a unit how can I tell if it is an HRV or an ERV by looking at it? I looked up the model number but the model comes in both HRV and ERV versions and I couldn't find any labeling that stated one or the other.

    • @CJZ964
      @CJZ964 Před měsícem

      Usually the HRV has a metal core. ERV has a plastic/ceramic core (unsure of the composition 100%)

  • @networkedperson
    @networkedperson Před rokem

    this video's background music isn't loud and annoying enough

  • @toyinorodare4072
    @toyinorodare4072 Před rokem

    I want to be your dealer promoting your products in Nigeria markets. Let us work together

  • @fuzzypickle5307
    @fuzzypickle5307 Před rokem

    Curious about the actual energy usage difference between the two, ive seen other sources go a little more in depth and state that the energy usage is nearly as efficient as a modulating compressor. We have to take into account LRA with the on/off cycle.

  • @mohamadrifai3580
    @mohamadrifai3580 Před rokem

    I am in Togo Africa and i need to install units but its very large its around 7152 square meter factory, and if i install this type how do i know the temperature inside the factory with 3ACH(air change per hour around 151000cfm) because i think if i change the air more, then i will arrive to more equal temperature with the outside air.

  • @jonwiersig5800
    @jonwiersig5800 Před 2 lety

    My swimming pool pump has an energy efficient two speed motor. When operating at the slower half speed, by the affinity laws, the flow drops in half (proportional to the speed change), but the power drop drops by a factor of eight (proportional to the speed change cubed). Why not use a two speed motor on the scroll compressor rather than the unloader?

  • @goetzfrank4090
    @goetzfrank4090 Před 2 lety

    Next video please without music. What you think might be uplifting and fun might just be bothering and annoying for the next person. This is about information. Thanks. Good info.

  • @TheOneTrueMaNicXs
    @TheOneTrueMaNicXs Před 2 lety

    Can the units run without exchanging heat? I'm form Texas where we have big temperature changes. Can I for example exchange heat during the day when it 95°F(35°C) and just exchange air not heat when it's night and 60°F(15.5°C)?

    • @aliyehya5521
      @aliyehya5521 Před měsícem

      By Exchanging air you mean rejecting the exhaust air and have 100% outfoor air, this is called Economy Cycle and it’s part of AHU design using motorized dampers connect to BMS system or HVAC controller. Erv and HRV are strictly for exchanging heat and humidity

  • @jaysheat631
    @jaysheat631 Před 2 lety

    I'm an HVAC contractor...this is BS

    • @Burritosarebetterthantacos
      @Burritosarebetterthantacos Před 2 lety

      Id love to know how you arrived at this conclusion.

    • @jaysheat631
      @jaysheat631 Před 2 lety

      @@Burritosarebetterthantacos are an HVAC contractor also? I'd definitely love to explain

    • @Burritosarebetterthantacos
      @Burritosarebetterthantacos Před 2 lety

      @@jaysheat631 Shoot. Ive done hvac for almost 20 years.

    • @jaysheat631
      @jaysheat631 Před 2 lety

      @@Burritosarebetterthantacos oh so it not a contractor...no sweat, u should still understand what a micron is ...look up what the size of the coronavirus is in micron's and compare that to the filtration of this device

    • @frankly2677
      @frankly2677 Před 2 lety

      @@jaysheat631 this unit is built to exchange air not purify it. For that you would need whats called an “air purifier” lmao.

  • @mark33545
    @mark33545 Před 2 lety

    what do you use in North east where its very cold but also very humid in the summer?

  • @tjalerkon3680
    @tjalerkon3680 Před 2 lety

    I don't know why the heck people play background music in such learning videos!!

  • @chantim02
    @chantim02 Před 2 lety

    Lower chilled water supply temperature may result lower chilled water flow rate and lower pump power consumption. However the calculation of energy saving excluded the power consumption of the pump.

  • @johnsakamoto3970
    @johnsakamoto3970 Před 2 lety

    Hello I’m Juan

  • @phillichillin1716
    @phillichillin1716 Před 2 lety

    Thanks for this, finally getting my head around it

  • @lehatuyentuyen3317
    @lehatuyentuyen3317 Před 2 lety

    CovidImages need to be invested more than half19

  • @sam2097
    @sam2097 Před 2 lety

    Informative video but the background music is way too loud. Thanks anyway.

  • @Commodore_heavywave
    @Commodore_heavywave Před 2 lety

    Pump down is not recommended.

  • @ItIsGonnaGetWayWorse
    @ItIsGonnaGetWayWorse Před 2 lety

    Random question: There is this random light switch-looking thing in one of my house closets labeled "CRV". Anyone know what its for?

    • @mike02454
      @mike02454 Před 2 lety

      Corpse Removal Vehicle. Don't flip that switch with your closet door closed.

  • @asaminguyen4002
    @asaminguyen4002 Před 2 lety

    CovidImages need to be invested more than half19

  • @artistuncle3949
    @artistuncle3949 Před 2 lety

    Nice msg

  • @beckysmith7517
    @beckysmith7517 Před 2 lety

    Hey I have a question? I have a 200 square foot tiny house with closed foam insulation and because I also use it as a greenhouse in the winter time and of course because of transpiration of the plants and evaporation of the soil after a watering… on top of two adult people breathing, I am getting a lot of humidity in the winter time. I also live in the SW Virginia area so we have pretty humid summers here too. Which system would work best for this application and HRV or ERV? I know both clean the air Im just more concerned with excessive humidity. I see a lot of people in tiny houses using HRV but what do you think I should do. Also I am looking for a very small unit… any ideas there because its again only 200 sq ft?

    • @airchange255
      @airchange255 Před 2 lety

      Hello, in this case removing indoor humidity during cold conditions should probably be your priority. This is because indoor humidity will condense when coming in contact with cold surfaces (walls and windows etc.). Condensation on surfaces can result in mold growth and building damage. Therefore a HRV will be best for you. It will ensure the humidity that is generated inside gets exhausted outside. Whereas, an ERV will recirculate some of the indoor humidity. We don't deal much with small residential units. But, you'd probably need a unit that does an airflow of approx. 50 CFM

  • @erwinarief4567
    @erwinarief4567 Před 2 lety

    inverter scroll compressor video please...

    • @airchange255
      @airchange255 Před 2 lety

      Yep, just been busy with other things lately. Will hopefully be able to get the inverter video up in the coming weeks

    • @mattlaporte9999
      @mattlaporte9999 Před 2 lety

      Hi, were you ever able to upload the inverter video? This one was so well done, I was hopeful for the Inverter one.

  • @LinNaingYan
    @LinNaingYan Před 2 lety

    My dad was watching ur video and it helps him understand about how this machine works. He has one that not working well cuz of the noise, so he cut it open and see if there’s dirt in it. He clean some dirt and assemble it back. When he close it back and run it again, the machine is not producing pressure anymore. He asked me to ask you if you have any tips and suggestions for it? He has done to other machine by cutting it open, clean the dirt, put it back and it’s running well now. He’s having problem with this one. Thank you.

    • @taiwanluthiers
      @taiwanluthiers Před 11 měsíci

      I think there's a clearance between the two scrolls required, and they are quite close. Close enough for the scroll to not seize up but not so far that there's no compression. I suspect what happened is you created a leak and now the scroll spins without any pressure difference. Also these compressors are hermetically sealed, and so only way to put it back together is weld it back together. These should be done by remanufacturing facility who can ensure the proper clearance.

  • @ancestorsreigning4186

    informative

  • @TAHIRHUSSAINMEPINDUSTRY

    Dear sir, can we reduce humidity level upto 35% for pharma requirements

  • @DISTRIBUTOR-MESIN
    @DISTRIBUTOR-MESIN Před 3 lety

    For detail specifications the machine & PRICE Machine Dehumidifier-Humidifier Please Contact VALTEKINDO Thank you

  • @islam56898
    @islam56898 Před 3 lety

    Good explanation, loud music

    • @hottubking1229
      @hottubking1229 Před 5 měsíci

      Yup, turned it off after 30 secs of watching. Too bad, looked interesting.

  • @joey2658
    @joey2658 Před 3 lety

    Hi, how much did it usually cost for add the bypass function, thx

  • @Jacob-uy8ox
    @Jacob-uy8ox Před 3 lety

    How do you do the actual energy calculations according to the temperature difference and volume rate of air?

    • @airchange255
      @airchange255 Před 3 lety

      We have a program that calculates this sort of thing for us. In this case it takes the change in enthalpy (kj/kg) between the outside and inside condition and multiplies it by the mass flow rate (kg/s). So we have (34.8 - 18.6) x 1.26 = 20.4 kW

    • @zacharyrollis8455
      @zacharyrollis8455 Před 2 lety

      @@airchange255 These numbers aren't in the video

    • @airchange255
      @airchange255 Před 2 lety

      @@zacharyrollis8455 Yeah, we didn't want to include enthalpy numbers as it might just confuse people. Calculations like this probably deserves its own video