refrigeration formula(btu=>hp,etc)

jort · 30th December 2004, 23:33

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)

http://metal.co.kr/zhlee/05_living_01_05.htm

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

Sidney · 6th January 2005, 03:19

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

6th January 2005, 19:06

THANK YOU VERY MUCH

jort · 6th January 2005, 19:18

no tnx

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

6th January 2005, 22:18

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

6th January 2005, 23:22

http://www.xtremeresources.com/forum...ad.php?t=33255

6th January 2005, 23:24

http://www.phase-change.com/phpBB2/viewtopic.php?t=1206

jort · 6th January 2005, 23:36

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

[Bonbon] · 6th January 2005, 23:40

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

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

jort · 6th January 2005, 23:42

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

6th January 2005, 03:19	#2
Sidney Member Join Date: Mar 2004 Posts: 15,738	I've had done with Physics and thermal dynamics many moons ago ..... don't remind me. Time for you guys to pass whatever exams. __________________ lazyman Opteron 165 (2) @2.85 1.42 vcore AMD Stock HSF + Chill Vent II

6th January 2005, 19:18	#4
jort Member Join Date: Jun 2004 Location: mechelen(belgium) Posts: 2,037	no tnx i'll put a guide of how-to choose the right size of insulation somewhere @ monday, tuesday __________________ watercooling, chilled water,direct phase change, cascade, custom modding

6th January 2005, 23:40	#9
[Bonbon] Member Join Date: Jun 2002 Posts: 692	if you use another frigen i guess ( frigen -> coolingliquid) a) For R404A/R507 ... b) Then for R22/R290 ... __________________ intelD820 (2*2.8), 1gb ram , 6600gt , lots of hdd

6th January 2005, 23:42	#10
jort Member Join Date: Jun 2004 Location: mechelen(belgium) Posts: 2,037	why make 2 example's then, if it is the same :grum: __________________ watercooling, chilled water,direct phase change, cascade, custom modding

6th January 2005, 19:06	#3
Da_Priest Posts: n/a	THANK YOU VERY MUCH

6th January 2005, 22:18	#5
Da_Priest Posts: n/a	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

6th January 2005, 23:22	#6
kristos Posts: n/a	http://www.xtremeresources.com/forum...ad.php?t=33255

6th January 2005, 23:24	#7
wutske Posts: n/a	http://www.phase-change.com/phpBB2/viewtopic.php?t=1206