Madshrimps Forum Madness - refrigeration formula(btu=>hp,etc)

Madshrimps Forum Madness (https://www.madshrimps.be/vbulletin/)

- Hardware Overclocking and Case Modding (https://www.madshrimps.be/vbulletin/f10/)

- - refrigeration formula(btu=>hp,etc) (https://www.madshrimps.be/vbulletin/f10/refrigeration-formula-btu-hp-etc-11365/)

refrigeration questions and answers (reply guaranteed)

for all the guys that has a compresor standing there or wanne make a phase change and dunno what that all means.
i'll try to make it very simple.

Btu =>

Quote:

British Thermal Unit—A measure of heat energy; the amount needed to raise the temperature of one pound of water by one degree Fahrenheit.

hp=>

Quote:

The work done per unit of time. 1 horsepower equals 33,000 foot-pounds of work per minute or approximately 746 watts.
Motors for pumps are rated in horsepower.

kWh=>

Quote:

A kilowatt hour is a unit of energy. It is equal to 1000 watts being used for one hour.
This would be equivalent to having ten 100-watt light bulbs on for one hour or one 100-watt light bulb on for ten hours.

kcal=>

Quote:

A kilogram-calorie is the amount of heat needed to raise the temperature of one kilogram of water (1 liter) by 1 degree Celsius.

Psi=>

Quote:

"pounds_per_square_inch"
a unit of pressure(mutch used in UK)

1 hp h = 0,7457 kWh
1 Btu = 0.293 W
1 kWh = 3,412 Btu
1 kcal = 3,9683 Btu
1 psi = 0.0689476 Bar

example:
1/8 hp is 0.7457 kW / 8= 0,09321 KW =>93W

usefull link (don't freak out when you see all those numbers) :^D
http://metal.co.kr/zhlee/05_living_01_05.htm

i'll update when i've got some more info

I've had done with Physics and thermal dynamics many moons ago ..... don't remind me. Time for you guys to pass whatever exams.;)

THANK YOU VERY MUCH :super:

no tnx ;)

i'll put a guide of how-to choose the right size of insulation
somewhere @ monday, tuesday

maybe some calculationsmethods voor lenght of captubes?
if you have some
my major concern...
wanna build a phase change unit this summer
ma mom is scared if i talk about rippin' a compressor from an old freezer or somethin and she wants me to buy a new one, and she even wanted to pay it, so she'll prolly help me buy that :)
don't know where to get captube yet, but I'll ask the same person... ( sell's and fixed householdstuff, so he'll prolly be able to help me...)
got a friend at my mom's work that wants to make me a evap to
daddy needs somethin' to braze his "tandem" with, so I'll buy that together with him to...
did I overlook somethin'?

grtz

Quote:

For R404A/R507:

Using a center point of 150 watts load I would guestimate 10 feet (3 M) of .028 inch (.7 mm) cap tube.

For each increase of 15 watts, I would shorten the cap tube by 1 foot (30 cm).

For each decrease of 15 watts, I would lengthen the cap tube by 1 foot (30 cm).

Then for R22/R290 (propane) shorten 1 foot (30 cm).

For .026 cap tube, multiply by .7.

For .031 cap tube, multiply by 1.6.

where is that line reffering too

if you use another frigen i guess ( frigen -> coolingliquid)

a) For R404A/R507
...
b) Then for R22/R290
...

why make 2 example's then, if it is the same :grum: