Refrigeration

Yes, it's possible.

absortion chiller

thanks for your suggestion, actually i thought to remove the use of compressor and inspite of a compressor i suppose to use a pump. which will make only flow of refrigerent, and the remaining work of compressor is suppose to be done by external heating element.

Yes to the first sentence; not really to the second. The refrigerant coming from the evaporator to the compressor/absorber/whatever is already vapor.

i think this will clear your confusion about what i am discussing about:

in case of VCRS:

evaporator>compressor>condenser>expansion valve/ throttle>evaporator

i want to remove the use of compressor by introducing the use of a pump.

in this way:

evaporator>pump>heating>condenser>expansion valve/throttle>evaporator.

Just whose confusion do you think you are clearing?

...now I'm confused

I didn't expect you to be confused ;-)

I think the OP doesn't know much about refrigeration, but imagines that since the condenser normally takes a hot gas and cools it, he can somehow do better (save energy) by using a pump (presumably pumping at a low pressure--thus using less energy), and then helping the refrigeration cycle by making the gas good and hot with an external source of heat before going into the condenser.

Maybe he's even thinking it makes it a little bit like an absorption refrigerator.

I probably can't explain it to him very well--yes compressing the gas with a compressor does make the gas hotter, but I'm pretty sure that using a low pressure pump followed by a heater will not make a more efficient refrigeration cycle.

But, I'm not really a refrigeration guy.

I was kind of joking . I AM a refrigeration guy. We get some pretty wacko ideas in here. I tend to think Mr Tornado can hold his own on the topic. I doubt the op can school him.

Re: I doubt the op can school him.

I agree, what I would hope to see happen is that the OP gets (gently) schooled.

The purpose of the condenser is to remove heat from the vapor phase and return it to liquid phase. Why would you add heat immediately before you remove heat?

You obviously have not the slightest basics about refrigeration.

Anyway, here it goes: The compression is necessary to get the vapour back to liquid state, after which it has to be cooled to get rid of the heat that it carried, after which the liquid can vapourise again to absorb new heat, and the cycle repeats.

"The compression is necessary to get the vapour back to liquid state"

Ya learn something new everyday. Here all these years I thought a compressor took a low pressure low temperature vapor and compressed it to a high pressure high temperature vapor. What does the condenser do?

Thanks for enlightening me

http://en.wikipedia.org/wiki/Absorption_refrigerator. Try this for information. All the cottages had these type of refrigerators when I was young. They are still used in many RV's

There are many ways to produce refrigeration effect. Vapor compression is one among them and mostly used . few other type where compressor is not required are stem jet refrigeration system, adsorption system, absorption system, thermo cooling by politer effect etc.

Peltier or Seebeck effect: http://www.mhtlab.uwaterloo.ca/TEC_master.html

A compressor IS a pump; a pump IS a compressor. What change are you proposing?

Concerning your speculation about omitting the refrigeration compressor in the cooling cycle and "condensing the heated vapor" nudges the borders of the absorption cycle which has been used commercially for over 60 years.

The motive power has been low pressure steam, high temperature/high pressure hot water, gas fired and waste heat from various processes and other sources.

Lou Bindner

Evaporation imparts cooling. A well-run cooling tower causes the water temperature to approach the wet-bulb temperature of the air flowing through it. So does that fit the bill?

Why Do you want to provide more heat from external Source, any benefits?