Solutions to Low Air Pressure on Air Conditioner?

Clean or change the filter. 95% of the time when I see a complaint like this, that's the problem. Do that first. If it's already clean, come back and describe the problem in greater detail. [edit] I am always gratified to see the asker is willing to actually enter into a conversation. It helps with the diagnosis. Air filter is new, good. That means the problem is an actual mechanical problem, not just a lack of maintenance. It sounds to me like your HVAC unit is failing to run at its correct speed. And by the description, for some reason it feels to me like yours is a Package Terminal Air Conditioner (or Heat Pump), called a PTAC or PTHP in the industry. That just means that everything is there in that one box, no ducting or pipes or anything like that. Window air conditioners are small PTAC units. You might have a problem with the switch or with the fan motor. Some of these machines are hard to work on, some are easy. Look around on it and find the make and model number, supply us with those. Next, operate the fan switch at all different speeds. From OFF to LO you are going to hear a change - that is, something vs. nothing, but at some point I reckon you do not hear a change. Is there a speed setting on the dial where it fails to ramp up? Get a thermometer and put that over the air outlet inside. Leave it for a minimum of fifteen minutes with the machine running at its hardest setting. You should see a temp between 45-55 degrees. If it's there, good. When we know the model number, we can determine how many CFM you should be seeing out of the outlet. That wo not help us a lot here since we can not measure how many CFM you are actually getting, but it will be good to know. Here's a thought: take the filter loose and see if you can see the cold coils inside the machine. Are the covered with frost or ice? If so, call maintenance back straight away, your machine is icing up. That could be low refrigerant, a faulty expansion valve, a failing fan motor or a few other things. Check those things, come back with more info. We are getting somewhere.

1. Why high air speed at flat surface don't always produce low pressure?

Speed does not produce low pressure, increasing it does!Bernoulli's equation says that for a fluid flow, in absence of elements doing work on the stream or having work done on them by the stream, $p frac12

ho v^2$ stays constant. But it does not tell us what constant. You can have flows with any combination of $p$ and $v$, and all will still satisfy the Bernoulli's equation.The blowers increase the energy of the air inside the hose. The energy can manifest as either static pressure, $p$, or dynamic pressure, $frac12

ho v^2$. How it chooses? Well, if the static pressure $p$ inside the hose is higher than outside, the pressure gradient accelerates the air out, converting the static pressure to dynamic, and if the static pressure in the hose is lower, the gradient decelerates the air. So the flow will quickly stabilize so that the static pressure matches the ambient, and the added energy determines the velocity. Therefore there is the same static pressure everywhere and the box between the two nozzles has no reason to move.The other experiments in the first video are not explainable by Bernoulli's equation alone, but instead effects of inertia and viscosity have to be taken into account. As the air flows around the curvature:Last, the experiment in the second video relies on the fact that the air is expanding in multiple directions, so the cross-section available to it increases. According to the above, the velocity on the outer edge will be such that the static pressure matches ambient. But before it gets there, it has to squeeze through the still much smaller area near where the hose is connected. Since the same volume of air needs to get through both per second (due to conservation of mass), and to do that, it must move faster. And since it moves faster, its static pressure is lower, and this creates the pressure differential that pulls the plate towards the nozzle.This is the only of the experiments that is actually demonstrating Bernoulli's principle.You see some of the cases are governed by one and some by the other. Fluid dynamics is extremely complex and difficult to calculate - the "easy solvability" or Navier-Stokes equations (that describe fluid dynamics; Bernoulli's equation is included in the set) is famous.Generally, the curvature works in most situations, but watch out for aerodynamic stall (when the angle is too steep for viscosity to keep the fluid flowing 'orderly'), while velocity only works when you have control over it, which is generally just in closed pipes. Bernoulli's equation simply expresses the internal energy of a fluid. If you do work on it you are adding energy, so that energy has to be added in the equation. Potential energy term omitted for brevity. Dynamics of jet and rocket nozzles is much more complicated, but at the low velocities involved it holds pretty well. It is counter-intuitive because it looks like the air has to move through less space, but since there is no opposite wall, it is free to expand as it suits it. This is counter-intuitive because it looks like the air needs to expand to more space, but again there is no other wall, so it can pull more air from far and wide to fill that space. I am not completely sure this case does not involve some additional effects. Actually the same mass, and to be accurate we should include the adiabatic expansion of air, but for the speeds involved air can be approximated as incompressible

2. Will there ever be a day in which we eliminate air turbulence? Or at least make it so that the passengers within the plane do not feel it?

You can do that today by tranquilizing every passenger.But it is not likely we can eliminate turbulence below 60,000 feet, or the feeling of turbulence hitting the plane. If we fly higher, we can eliminate it since air is the thing that is turbulent and the less air there is, the less turbulence.

3. Is it possible to run an engine on atmospheric gases gathered during flight or driving? Would it be possible to use an air intake and a series of chemical reactions to run, say, a hydrogen fuelled engine?

Yes, that's how most engines work. Car engines draw in atmospheric oxygen by creating a vacuum with their pistons, add gasoline or diesel, and burn the mixture. Modified car engines have also burned hydrogen, natural gas, propane, and plenty of other clean burning fuels.Jet engines are gigantic air pumps that spritz some fuel into the air rammed into the engine by the compressor stages. Steam engines draw air into their boilers to burn the fuel.About the only engines that do not use external atmospheric gases are rocket engines, which bring along their own oxidizer and fuel. However, there have been studies into Air-augmented rockets and Liquid air cycle engines.

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