Cooling Definition and 628 Threads

Homework Statement An ideal monatomic gas has an initial pressure of 3 atm, an initial volume of 1 L, and is at an initial temperature of 90 degrees Celsius. It first expands isothermically to 2 L and is then cooled isobarically to a point where it is adiabatically compressed to its initial...

I have a question about fans and airflow, specifically related to processor cooling. I have a large heatpipe/radiator on my processor which came with one fan installed that blows air across the fins (a push fan). The assembly is set up to be able to add a second fan on the opposite side to...

Hi! I am trying to design a water cooling system that could cool down my computer from 100C to about 40C, with 600W of energy being provided by the components. Could a system that moves 0.2l of water at 0.1kg/s from a water tank to the computer components to a radiator and from there back to...

An object is taken out of the oven that is set at a temperature of 370 F and taken to a room that is at a temperature70 F. After 5 minutes, the temperature of the object is250 F. a) Use the Newton’s law of cooling to write a differential equation for this situation. I started with...

How does temperature fluctuate from the outer layer of the sun outwards to space? Is there any data or equations modeling this?(I'm not an astronomy or physics student, just interested)

Hi everyone, I have a general question on fluid speed for air. What would be a reasonable design limit velocity for air? Assuming that it does not pass the speed of sound which can bring an whole set of other problems 1116 ft/s = 761 mph at sea level. Would 900ft/s be a reasonable...

Hello everybody, I have been here before, with different username and cause i didn't log into long time ago, the username doesn't work for m now, so here i am with the new user. Just as a respect for the forum rules, to not post a topic once i register. i am doing cooling load...

I am looking to cool my air supply before applying it to an application in a temperature chamber. The chamber will be at cold the air supply from outside the chamber will be ambient temperature. I want my supply air to be cooled to match the chamber before it enters my application, so pressure...

I live in Dubai, and the water for my whole house is stored in a water tank on my roof. This is a problem as during the summer months the temperatures reach up to and a bit beyond 50 degrees in the day, this heats up the water in the tank a lot so we don't have any cold water during the later...

I know how Nuclear Power works so this will help you move a little faster with helping me. Whenever I see a Specs on how they Colldown a Reactor they show you a big Pump going into the Core and turns and goes back out. In this big Pump is Cold Watter and because it is going throu the water...

An environmentalist friend of mine wants to cool a building on his property (something like a shed or workshop) not with AC, but by blowing air from outside into a pipe underground, running it underground for a distance, and then blowing that air straight up into the building. I need to find...

I was interested in liquid cooling system for my computer tower and had a few (?)s 1. How can i make my own liquid cooling system? 2. Is it cheaper than fans? 3. can i make a liquid cooling system cheaply? 4. Does it look cooler than fans? 5. If i can make my own liquid cooling system can i...

1. A problem that I need to solve for class is asking me to solve Newton's Law of Cooling for a 4-layered system. The system is a cube with three layers (also cubic) around it. The inside cube and the three layers all start at the same temperature that is lower than the ambient temperature...

Homework Statement Newton's Law of Cooling states that the temperature of an object changes at a rate proportional to the difference between the temperature of the object itself and the temperature of its environment. Suppose the ambient air temperature is 70*F and that the rate constant...

Gas turbine fuel/air ratio & cooling, help please! Hello Dear Colleagues, I am doing a gas turbine project and I wonder why we use cooling air instead of decreasing the fuel/air ratio after getting the following results from my gas turbine thermodynamic model. I have a mechanism in my model...

Newton's Law of Cooling basically states (I believe): TObj = (TInital-TEnv)ekt + TEnv where k is a property of the material. In the equation: Q=mCΔT Specific heat capacity, C, is also a material property. So here's my question: Is there a relation between Newton's Law's k and the...

I know that Newtons law of cooling is useful when a solid is transferring heat to a fluid. And conduction equation is used in solids. My question is: 1) Can Newtons law of cooling be applied in case of solids (apart from Heat conduction equation)? 2) Can Newtons law of cooling be applied in...

Hello PF. I thought this would be a good place to ask around for information pertaining to "where we are at" in controlled creation of ultra-cold environments for atoms; for example, how cold an environment can we actually make today, etc.? I am especially interested in the BEC phenomena. When I...

Homework Statement The problem states that you discovered the body at 1pm Thursday in a freezer where the temperature was 10F. Temperature of the corpse at discovery was 40F. I have to find how many hours ago the victim died. Homework Equations You are given the formula T = Ta + (98.6 -...

Homework Statement please i need help as have been trying to solve this question: A body cools from 70°C to 50°C in 6mins when the temp of the surrounding is 30°C. what wil be the tempt of the body after another 12mins if the cooling obeys Newtons law of cooling equation: dq/dt =...

Homework Statement after a very unpleasant valentine's Day, a dead body was found in a downtown warehouse that had no heating or air conditioning. it was February in Florida and we know that the daily temperature in the warehouse fluctuates according to the function T(t)= 63-12sin(∏t/12)...

Homework Statement The temperature of an object has been lying at rest and cooling for sometime had been found to be 31oC. An hour later, the same object was found to be 30oC. The room was also What was the initial temperature of the object, assume Newton's law of cooling applies...

The SABRE engine, currently being developed by a company in Oxfordshire, England, is a single stage to orbit, experimental hybrid air-breathing/LOX rocket engine with a rather fascinating heat exchanger that pre-cools the air before entering the combustor. What fascinated me the most about this...

Hi guys, not sure if this is in the correct section but I'll go ahead anyway. I'm working on an automotive design project. The car that I'm designing has twin micro jet turbines, like the Jaguar CX-75, to charge and power the electric motors propelling the car. The problem that I'm trying...

the Dyson bladless fan relies on forcing air out along one side of the rim of a ring, so drawing air from the other side of the ring to create more airflow the household implementation of the fan uses an ordinary air compressor at the base to pump the air into the ring, and this creates a...

So, i just opened a soda can that hadn't been refrigerated and upon drinking it, the soda felt much colder than i would have expected from where it was stored. i realize that the cans are pressurized from the CO2 and that on opening they lose this pressure. to my understanding the when a...

A solid steel sphere is heated to 150 deg F and allowed to cool in a room at 60 deg F. During cooling, the sphere is wrapped in insulation which is at room temperature before used. Will the surface of the metal sphere warm or will only the rate of cooling change? Don't laugh, I've seen...

I figure that it is possible for temperature to decline in a fixed volume system that is thermally insulated. The reason why is that, from what I understand, is that random kinetic energy may have angular momentum. If we were to subject a volume of such energy to a rotating force (torque), then...

Hello mates, anyone here ever studied or used the method of rapid cooling called "Splat Cooling" ? I will use this method for the processing of two types of alloys. Ti-Fe and Ti-Fe-Sn. Then I will compare its phases, microstructure, etc and properties like nanohardness. I would really...

Homework Statement The first part of this question deals with interstellar gas collisions at a certain velocity, and the resultant temperature of the cloud is obtained. Then this question: The main coolant has the following radiative loss rate \Lambda=n_H10^{-28}T_{gas} \text{erg...

Is there a well-established theory for temperature and cooling processes of neutron stars as a function of time?

Homework Statement Using a data logger, I have collected data for two cooling cups: the temperature (c) at 1 second intervals. My task was to model this data using two methods. "METHOD 1: Use EXCEL or the regression analysis capability of your graphic calculator" "METHOD 2: Find the...

input heat, output cooled air Homework Statement As the title says, I am looking to produce cool air with heat. Homework Equations The Attempt at a Solution

There are two sphere of same radius but one is solid and other is hollow. Both are heated to same temperature(greater than room temperature). which will cool at faster rate? I think both the spheres will cool at same rate since hollow sphere can't loose it's heat inside it (because internal...

Oh you who are wise in the ways of Physics, I beg a moment of your time. I've poked around wikipedia and found my way to PV=nRT and Thermal Mass and some other basics, and Googled "compressed air" "ice" "expansion" and similar, but can't quite find anything that helps me answer my question...

I want to use 2 radiators instead of a single radiator for cooling a maruti suzuki 800cc engine. The reason? we are participating in SUPRASAE 2012 and our space for the radiator is limited(we can't accommodate the 300*335 mm radiators but we can accommodate two radiators within 200*300 mm). Can...

Your dorm room has a temperature of 72 °F, and you have two six packs of beer that you want to get ready to a drinking temperature of 61 °F for dinner. Your fridge has a temperature of 44 °F, and experience has shown that a room-temperature six pack, placed in the fridge, will be at drinking...

Since they are closed systems, and do not contain water, why do they use a dryer? And how does that dryer works? It uses a dissecant? If so does it need to be changed?

An engine switched off and left to cool naturally will obey Newtons law of cooling. A particular engine is switched off at 105°C when the ambient temperature is 0°C. Its temperature falls according to the equation T=105e-0.025t °C. Where t=time in minutes. c) use calculus to determine the...

Homework Statement When you turn on an electric heater, such as "burner" on a stove, its temperature increases rapidly at first, then more slowly, and finally approaches a constant high temperature. As the burner warms up, heat supplied by the electricity goes to two places. i.) Storage in...

Hi, I'm trying to model a compensation device in a hydraulic system. Basically, I have a closed pipe that contains a body of liquid (water glycol) and as time elapses this fluid is subject to a cooling effect. This results in contraction and hence a pressure decrease which is subsequently...

Hi! So this is the scenario. I have 27 litres of water at 100 degrees Celsius. I have to cool the water to 20 degrees Celsius within 5 minutes. Since the heater power required is too high, I thought this could be done by adding in water at 20 degrees Celsius while draining out the water...

I did this problem a few times now and double checked my procedure but I don't see what I did wrong. The answer should be 6.07 minutes according to the back of the book, but I get 3.63. Homework Statement Newton's law of cooling states that the temperature of an object changes at a rate...

Do any of you know if the backup water pumps have been upgraded at the Byron NGS? Also, is the plant currently using the main cooling pumps, or the backup pumps? Last year after the Fukushima triple meltdown, the NRC told the Exelon that the backup cooling pumps at Byron were too small...

I don't understand Newtons law of cooling dT/dt = k(a - b) were a is the object and b is the surroundings that the object is placed in... Is this correct or is there suppose to be a negative sign like so dT/dt = -k(a - b) also does Newton's law of cooling apply to putting a cold object...

Homework Statement dT/dt = -k(T - T_m) T is the temperature of the body, T_m is the temperature of the surroundings, -k is some contant and t is ofcourse time Homework Equations no idea The Attempt at a Solution I tried solving this using first order linear ODE...

Hi everyone I am looking for someone who could possibly help me with my calculations regarding injection moulding. Basically I have four different inserts (from four different materials). Into these inserts the molten plastic is injected, where stays for about 22 seconds and then is ejected...

Hi yes i have an Intel Pentium D 2.8GHz processor and i have 1 92mm case fan on the back pulling hot air out and another fan pulling aisr in and my CPU fan is pulling air into the heatsink and my computer runs at between 50c and 70c...i was wondering if i have a problem cause i put new thermal...

Can someone please explain to me why a liquid cools down when it evaporates:-D

I am doing a zainy experiment at home. I need to devise a way of applying a cooling intensity factor (CIF) of around 70 mW/cm2. I need to cool material that is roughly 30 degrees Celsius down to around 2 degrees Celsius. The cooling has to last for a period of one hour or more. The surface...