Air conditioner Definition and 61 Threads

I've got this 300 square foot sunroom off the back of my house. It was hastily and amateurishly assembled by the previous owner. It's got a clear, corrugated panel roof, and large windows on the south and west walls. There are lowered panels that block much of the roof light (which probably just...

Hello, The technician installed a new AC split without a vacuum pump. (Gree 24000 BTU Inverter) Should we drain the refrigerant, do vacuum, and refill the refrigerant? It is written in the AC manual that we should vacuum during installation. I read that air and humidity are harmful for the...

Hello, I bought an air conditioner 24000 btu Inverter. ( for home). The indoor unit makes strange noises/sounds at night. The pattern is as follows: First, wind blowing and cooling are reduced to 80%. (Similar to fan mode) After some minutes(About 3-4 minutes), Then the sound (sound in the...

What approximate portion of generated heat from being active on the treadmill, both the person on it as well as the machines themselves would be compensated/cooled if the treadmill resistances would be disabled/removed and instead 1/2 end cylinders would be connected to an air conditioner...

The other day I read on a website that a lower evaporator airflow causes lower low pressure side saturation temperatures and higher delta T on an air-conditioner. Now I think I know why a lower evaporator airflow would cause a high delta T. If there is less air moving over the evaporator, the...

https://slate.com/technology/2022/07/inflation-reduction-act-climate-bill-manchin-heat-pump-solar-panels-electric-cars.html First, this text makes no sense as it seems to say that the problem with A/C can be solved by "shift[ing] hot air in". But then it also seems to say that a "heat pump" -...

1. In this system the sun boils Freon in a solar panel. 2. Freon vapor is sent to a turbine or piston motor. 3. Freon discharge from the motor is sent to condenser coils submerged underwater. 4. The cooled, low-pressure Freon is sent back to the solar panel inlet. 5. The Freon-powered motor...

Hi, A Korean friend owns me money and plans to pay partial with his airconditioner. But the aircon model came from Korea. I just want to know if an air conditioner like Carrier of a specific model made in different countries have the same design, or do they have separate say Korean design, or...

I have an air condition that is 9.000 BTU and it states at the external unit that its Power is 1.2KW. However because I know that an air condition has inductive loads (motors) its power factor is not 1 so I am not sure 1.2KW is the real power consumed. I am thinking to calculate the power...

Hi, If you have dirty window type airconditioner in a room and it hasn't been washed or cleaned for say 3 years since installed, can the dusts, molds, etc. inside the airconditioner got into your lungs and become sort of like streaky infiltrates? Or does it simply circulate the existing dusts...

Hello everybody! I was wondering today if physically, it'd be possible for the world to develop an air conditioner without an outdoor heat unit? I know this seems to violate the second law of thermodynamics, but the known version of the second law thermodynamics only consider this is impossible...

I read before that room air conditioner is not supposed to suck in air or particulates/dusts from outside but my air quality monitor can detect some increase in pm2.5 particulates when the aircon is opened. Is it because its sucking those particulates from outside or the fan of the air...

I know heat is a form of energy, and that’s conserved, so usually an air conditioner will emit heat on one side, cooling on the other, probably increasing the overall heat in total. What’s not clear to me is if it always must do this, specifically if the air conditioner produces another form...

Hi guys I am not certified engineer but I watched many videos to make home based mini air conditioners using Peltier module. So I decided to try this as experiment. My plan is if this small test project works well then I will proper mini a/c (for my small 10x10 feet office or at least for my...

I have a problem with my air conditioner fan not starting. As seen from the schematic below, when I test for voltage between the brown and black wires, I get 0 V (this is the problem). The indoor unit isn't sending the control signal to turn the fan on. The compressor powers on fine though. When...

I still confuse about COP of refrigerator. When i read some journal, it is said that COP of VCRS can be greater than 1 (usually 2 - 4). But, why the COP other than VCRS usally lower than 1? like vortex tube, vapour absorption refrigeration system, etc. Actually, now i am doing a research about...

The air conditioner is set up to put the temperature at 72F. Which I hate because that's cold, but whatever. The air conditioner turns on and works for about 6 minutes when it automatically turns off because the temperature reached 72F. It stays off for 10 minutes and then it turns on again...

Hello everyone! Summer is coming and instead of buying a $200-$400 air conditioner, I'd figure I could try a DIY version. I came up with a schematic (attached below) and how I think it would work. I feel like I'm missing something blatantly obvious that will make it not feasible. Wondering if...

What do you think about conditioning the outdoor air? Is it impossible? Is it useless? Is there any research about it?

Hi Air conditioner vs evaporative cooler: ratio of (BTUs/hr) / electrical watts I know evaporative coolers do not state BTUs/hr. I do not know why. Did anyone try them and record time taken to cool. I found this example, but I do not know if it is practically relevant...

Hi Air conditioners power should vary with thermostat and fan/Airflow rate levels. Is there data on Power vs BTU? Is it directly proportional? Thanks

am trying to simulate air conditioner in open modelica and matlab.. is there any library like hvac so that i can do the simulation in mush easier way...

hi guys... am working on a variable refrigerant flow (VRF) type air conditioner. my aim is to change the capacity of the compressor based on load change. i can vary compressor capacity by using inverter...now my doubt is on what basis i should change compressor speed for muti evaporator...

Really quick question, what exactly does the fan of the outside part of my split ac do? That fan seems to just make wind for no clear reason. I'm curious to know what it actually does.

I am currently doing a research on energy consumption of Room Air conditioners based on BEE rating. Are there any available industry benchmarks for energy consumption of Air conditioners by rating of the AC? For instance, for the given scenario (defined constants) below, any inputs on how to...

I bought a new home AC (split; 1.5 ton) and the tech the company sent to install it didn't seem to have neither a vacuum pump nor a N2 cylinder in his kit. I am leery. Is it really possible to install an AC without these items? Can he do a reasonable job evacuating the lines & leak testing any...

The ad says: "5 Years Warranty on Compressor, 1 Year Warranty on Main Unit" Nice so far. Next the ad says: "Not Covered in Warranty Plastic and Rubber Parts, Lamp, Interconnecting Cable, Rubber Pads for Remote Control, Interconnecting Copper Tube, Aesthetic Parts, Condenser Coil, Evaporator...

Preface- I am anoob scum who doesn't know much How and why does an air conditioner gas cool when it evaporates. Exactly how does the gas's molecular kinetic energy lessen, and more specifically how does the kinetic engery from the room and pipe that holds the gas, get transferred to the...

Hi; As we know that flooded lead acid battery needs to be top-up (watering) after passage of some time and it is recommended to use distilled water. Many people say that water condensed by Air Conditioner is also very good to top-up the battery. Is it true?

Hey Guys, I'm not a physics student, not a physics lover but so admire those people that know physics! Well that's why i come here for this question: what kind of air conditioner can help my room exchange fresh air? Does the Fan mode in every air conditioner intake fresh air or not? Here is...

Homework Statement I have access to a test facility for window type air conditioners that has a small room that is used to simulate the outdoors. I need to use the facility to test the effect of temperature on the performance of one of our window type AC units. The performance must e done as a...

I am always looking for the right combination of cooling products to keep my system frosty and in my digital travels I have encountered a wide variety of fans, heat sinks and liquid cooling units. Now perhaps I have just overlooked them but why has no manufacturer ever come out with a micro air...

I have heard from not very educated 'technicians' who installed my air conditioner, that I must first switch off the compressor of the AC by switching it to fan mode, and after some time, switch it off, to avoid some kind of collection of cold air inside it. I kind of followed it for the time...

Hi! I really want to know how evaporator is made. i mean it is impossible to made by casting process, but i also not sure. anyboby who involve in this industry can please help me

Hello, I am confused about air conditioner Btu specs. When I try to match the power input in watts, to power out in Btu/hr, the numbers don't come out even close. Example: This 6000 Btu window unit has the following specs: Volts 115 Amps 5.4 So the power input in watts is: 115 x 5.4 = 621w...

I am making homemade ac. I am using an ice box for it. I found the link on the internet http://www.instructables.com/id/Cheap-DIY-Air-Conditioner/ I want to ask is 1. The fan which is used must get heated by the operation 2. This will produce a lot of heat 3. This will melt the ice or take...

Homework Statement If a room is at 27C and the surroundings at 42C, and the heat into the room is 2,000 Cal s-1. What is the minimum work the air conditioner must do to keep the room at 27C?Homework Equations COP = Tc/(Th-Tc) Win = Qout/(1+COP) The Attempt at a Solution COP =...

I haven't been able to find a satisfactory answer. What would save the most electricity? One of my roomates and some of the neighbors below us think that it is better to leave the air conditioner on all day. Normally, for just one house with one air conditioner, I would be very skeptical: I...

I have a 2600 sq' home in Arizona. I have a 13 seer a/c system with two units. I havea second story of my house which is only a loft. Is is more beneficial for me to leave the thermostat off upstairs to conserve energy during the peak hours that my electric provider has from noon-7pm? Or is it...

I have two questions/ideas about the efficiency of A/C's that I'd like to bounce off you guys. I couldn't find anything on Google about either of these items being discussed before. 1) Precooling The first thought I was wondering was whether it was more efficient to pre-cool your house in...

Q: A Carnot air conditioner operates between an indoor temp of 20C and an outdoor temp of 39C, how much ENERGY does it need to remove 2000 J of heat from the interior of the house? A: 130J i got 121J O.o?

A Carnot air conditioner takes energy from the thermal energy of a room at 76°F and transfers it as heat to the outdoors, which is at 96°F. For each joule of electric energy required to operate the air conditioner, how many joules are removed from the room? Attempt at problem 76 + 273 = 349 96...

Hi friends, My air conditioner is a split one (it has 2 parts: one inside the house and the other outside). It has 4 modes of operation: cool, fan, and 2 other modes. My question is that what does the machine really do in the fan mode? I wonder whether it just serves as a normal fan...

Homework Statement A Carnot air conditioner takes energy from the thermal energy of a room at 70 degrees F and transfers it to the outdoors, which is at 96 degrees F. For each joule of electric energy required to operate the air conditioner, how many joules are removed from the room? Homework...

In some threads in the past I hinted vaguely that one feedback mechanism in climate is not really mentioned extensively, that's the latent heat energy transport, from evaporation at the Earth surface to condensation in the higher levels, forming clouds and altering the dynamic radiation balance...

I can't seem to find a straight answer so I thought asking here might come up with a credible response. Everyone I know tells me that it wastes more electricity to turn off your air conditioner because of the amount of energy it takes to cool the house those extra degrees when you turn it on...

Homework Statement The thermal efficiency of a refrigerator is determined by the coefficient of performance , which is defined as the ratio of the amount of heat removed to the input of mechanical work needed for operation, or K=Q_c/W_in An air conditioner operates exactly as a...

Folks This is my first post to Physics Forum. I've started a project to put air conditioning into my '86 Westfalia van. The stock AC never worked and was ill-designed with huge long runs of tubing back and forth in the van, so I've removed it. I located the smallest possible 115 V AC window...

hello everybody, in fact,im asking for a help in a matter confused me alot,its about how can i select the right (split,mini split,portable,window,etc) air conditioner,which is not central air conditioner. im working now in a company and they size the air conditioner for the customer according...

Homework Statement Air conditioners operate on the same principle as refrigerators. Consider an air conditioner that has 7.00 kg of refrigerant flowing through its circuit each cycle. The refrigerant enters the evaporator coils in phase equilibrium, with 54.0 % of its mass as liquid and the...