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generally mass flow rate (mass dot) = density x volume flow rate but ive just read in a book that: massflow rate = volume flow rate x pressure ! ....this must be wrong it shows a "p" instead of the density symbol ...just wanted confirmation thanks

we've got an industrial chillar system supplying coolers in a room full of servers. We wanted to cool the room further so we added another cooler in the room to pump out more cool air. but the tempreture dint really change. So then we lowered the tempreture of the chilled water being supplied to the coolers by about 1.5 degree celcius. the room tempreture then droped by about 4 degrees celcius. Why has there been such a big decrease in temp ? or is that normal?

thanks you^^^

im doing a presentation on chiller systems. I wanna convey to my audience the meaning of 1500 kW of cooling. Can some one tell me what for example 1500 kW of cooling could be compared to ...something like "this amount of cooling energy could be used to make this many ice cubes in this amount of time" ...or something along those lines ....doesnt have to be ice cubes Any help or links to useful sites would be appreciated

hello ...i have a question, (im a bit of a newbie to this theory stuff!) in a basic refrigereation cycle there are 4 basic components: evaporater, compressor, condensor and expander. and a working fluid (wf) or refrigerant flowing through the whole sytem - so the in the evaporater, the wf absorbs the heat from heat source. - next the wf goes through compressor which compresses it and raises temp. - next wf goes through condensor and releases heat to the heat sink, hence ruducing wf temp. - wf then passes through expander which expands the wf, cooling further the temp. - cycle repeats. so my question, which is probably a silly one, is why is there a need for a compressor to raise the temp?, why not just directly go to the condensor and release the heat? help in understanding will be appreciated.