using R-22 for example...what my question means is that to design a refrigeration cycle u select the pieces according to capacity, but what makes sure they wil operate at a certain condensing temp and evap and not another?
Suppose ur designing a refrigeration cycle. if u go to the market to choose parts for an 18000BTU/h circuit. The compressor has different ratings according to the entering temp and exit temp, then u have the thermal expansion valve which is also rated in BTU/hr depending on entry and...
about the 10 tons, the performance of the heat exchanger lies in tubing, and gases flowing, and so and so...i felt its wierd that they rates the compressor as if it was the only defining principle in the heat exchanger. but i guess ur right.
yeah, but u always have to see that ur input heat compensates for the loss of heat from the surface of the pool. like if evaporation causes 10kW loss, and ur heater only compensates for 8kW..so ur water is gonna become cooler gradually
Well i'm not sure about that, i think they are kind of experimental cause they are measured relative to one external air temperature. Besides newton's law of cooling doesn't allow us to measure the convection constants of air neither the radiation constants.
yeah i found this website too:) thnx anyway.
what i meant in temp leaving the pool is that after steady state is reached and my pool is heated, i need to maintain that heat. so when i have to reheat the water i'm taking it that this water leaves the pool to be reheated at 23 Celsius, do u think...
thats a big difference between this value and the value given on the website !! and yes the pool is inside and heated (at least the first one)..my research is to design a heat exchanger for it.
i have another question in that matter, if i want to calculate the temperature of the pool water...
I found values for heat transfer from a pool on the following website:
can someone please tell me how reliable is this information?
especially that they didn't mention free natural convection, or is it...
i'd worry about backfire, uneven flow through the valve. just because some technology has advanced far doesn't mean its too late to try new ways. but i'm worried about backfire and even distribution inside the cylinder, cause theres no spraying control in such valves.
first of all it varies if u start from 45 or from 26..what i would do if it was a rotational repetitive cycle is to start from 45, and calculate heat loss according to the chosen increments. after each increment u can calculate the temperature the water has reached. then u start again. of course...
usually most engineers are paid the same. according to my observations engineers who get into business or management will get paid higher and will go further in modern day corporations. (my observations are limited to the middle east though)
r u sure about that? i mean i know that the engine operates by varying its polarity on 1 side, and keeping it the same on the other. would be difficult to do that using AC, unless you r using a permanent magnet system ? what do u think?
The battery probably won't hold not for any backup time u need like 10 of those batteries to have decent backup.
An electric motor is usually DC driven cause from the way it works, if u put AC current on it, it will move back and forth thus staying in the same place and we don't want that to...