Questions tagged [cooling]

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2 answers
46 views

Kitchen fridge thermal power and COP

In general, a kitchen refrigerator is essentially a heat pump. The vapor compression cycle creates a temperature difference, and the insulated compartment stays cold. But how can I determine the heat ...
0 votes
1 answer
77 views

Lubricant fluid and Rubber compatibility

I have a portable band saw, which I plan to add lubricant fluid to (this is getting ahead of myself, as I haven't even constructed a portable band saw stand). The main problem with this and the reason ...
1 vote
1 answer
36 views

Heat transfer: does the heat generated in a cable get transferred to the electrical components?

I have a 1000 V, 50 sq mm, double insulated (XLPE) copper conductor cable. This cable is being connected to a power electronic component. The current flowing through it is 230 Amps DC. The cable ...
1 vote
0 answers
58 views

Can pyrolytic graphite sheets effectively be used as a thermal gap-fill interface?

Pyrolytic graphite sheets are used as a high-performance thermal interface in applications with high power density because they can have a very high conductivity of 1000+ W/mK, but only in the ...
0 votes
0 answers
59 views

How to vary, according to a given sinusoidal profile, the water temperature in a tank, independently of the temperature of the environment?

The water tank in Fig. 1, that is placed in a closed space, has a heat source inside (an experimental device) that liberates 20 to 50 kW of heat. However, the water temperature in the tank has to be ...
1 vote
2 answers
95 views

Can I weld a copper pipe into a CPU heat sink for better cooling?

I have an old laptop which I revived with the addition of a SSD. The problem now with this laptop is that it gets very hot causing thermal shutdowns in the middle of work. I thought of a lot of ...
1 vote
1 answer
68 views

What materials to use indoors to absorb sunlight and store it as heat?

This is a very practical question; the underlying principles are, I imagine, extremely well-known. I'm buying a new place in the northern hemisphere (49° N) with lots of southern (or rather SES) ...
0 votes
1 answer
208 views

Energy required to liquify gaseous oxygen?

Does anyone know where I can find some documentation of a real-world liquification process, and the energy costs? I can calculate the heat that must be removed from O2 gas to get to liquid, but how ...
0 votes
2 answers
33 views

Is it possible to remove a split unit's head, and replace it by a false-ceiling head?

Normal split unit: Ducted split unit: I have: Outdoor split unit that compresses gas. Compressed gas moves down to some room where it connects to some wall-mounted indoor split unit. The indoor ...
2 votes
2 answers
1k views

Heat transfer Calculation, for Cooling for an aluminium box

To go into more detail, I basically have a controller and its housing is basically an aluminium box that I need to add heat sinks to. But first I need to calculate how much heat is being dissipated by ...
3 votes
1 answer
151 views

High Fan Speed Not Cooling As Expected (PWM, Arduino)

We have a system involving a fan blowing air through a box which contains a small (but constant) heat source and a temperature sensor. The fan speed is controlled with PWM. As PWM (and hence fan speed)...
0 votes
0 answers
33 views

Compressor ratio and addition of battery cooling loop (chiller) in the existing HVAC circuit

Imagine if i want to change my IC car to an electric vehcile, with the obvious addition of battery, how can i use existing HVAC loop to cool the battery using a chiller. HVAC was obviouly desinged ...
0 votes
0 answers
21 views

Minimum cooling flow without an outlet temperature

I want to calculate the minimum cooling flow rate $\dot{m}$ for a stirred batch process. The stirrer heats up the reactor's content quite intensively, so first I calculate the temperature of after ...
-1 votes
1 answer
59 views

Is this HVAC design incorrect?

Pic for reference - any HVAC pros around? https://imgur.com/e9JfLFO The return duct matches the supply duct width, but the intake drop looks so small in comparison. Do I need to get this fixed with a ...
0 votes
1 answer
61 views

Water dynamics in aluminum pipeline for dummies

This topic is totally alien to me, so I may be asking something very obvious. I am designing a cooling system. In the bulk of aluminum, I drill 3mm holes and then I connect them one to another to ...
0 votes
2 answers
117 views

How to compute wall heat flux q with just wall temperature

I am doing some simulation for natural circulation loop and have a heat rate q in the heating leg and a fixed temperature for the cooling leg. I know the heat rate for the heating section (128 W) and ...
1 vote
0 answers
58 views

Ideal height for placing indoor split AC unit?

This is an indoor air conditioner unit of split-unit type. It has the compressor outside (usually on the roof), and the indoor looks like this: The question: How to determine the ideal height of ...
0 votes
2 answers
187 views

Window mounted split air conditioner

I was wondering if there are any window mounted split air conditioners in US market or anywhere else - One in which compressor and radiator hang out of the window and only evaporator is inside the ...
0 votes
0 answers
38 views

Air-to-Water Heat Exchanger - Car radiator

I'm looking for a way to keep a liquid under 50°C. This liquid has a thermal conductivity of .1396 and a specific heat of 2.054 both at 40°C. and a constant energy source submerged in it ranging from ...
-1 votes
2 answers
84 views

How to calculate the volume of air that will cool steel?

The task is to cool steel pieces in boxes with indoor air using a fan. The number of boxes is 6 pcs, each weighs about 15 kg. It is required to cool them from 90°C to 30°C with using 30°C air in 9 min....
1 vote
1 answer
55 views

Can peltier modules be more efficiant with a medium other than air?

Peltier modules are said to be less efficient than conventional air conditioners. Can a medium like moving cold water over the heat sink increase the efficiency of a peltier module? By how much? ...
1 vote
0 answers
47 views

Can a semi-conductor cooler be powerful enough for a room? [duplicate]

I see semiconductors used for small fridges. I cannot find one large enough to cool a room (in place of a conventional Freon based, window air-conditioner). What engineering problems might a up scaled ...
3 votes
1 answer
89 views

Does adding cold water to evaporative air coolers actually produce colder air?

Or should it be the other way around, because hotter water evaporates easier than cold water? I know this sounds stupid, so just hear me out. I use an evaporative cooler and add normal room ...
3 votes
2 answers
2k views

Why do a swamp cooler and dehumidifier effectively cool a room when paired together in an enclosed space?

I've read in more than one place (e.g., here and here) that a swamp cooler (a.k.a., evaporative cooler) can be effectively paired with a dehumidifier to cool an enclosed space, but this makes no sense ...
1 vote
0 answers
29 views

Air Conditioner for an Acrobat Plane

What kind of Freon air conditioner would work upside down? Or somehow make it cut off and start working again when upright? I have a small cabin so it can be electrically driven. I know they have an ...
21 votes
10 answers
9k views

Why not put servers in a refrigerator?

Recently I was thinking about home improvement, and one idea that is haunting me is that I could use some kind of refrigerator for gaming consoles and laptops. The obvious benefit is that it maintains ...
2 votes
2 answers
3k views

Is a metal Prince Rupert's drop possible?

Can a Prince Rupert's drop be made of metal instead of glass?
3 votes
2 answers
163 views

Cooling tower for nuclear power plants

Cooling towers for nuclear power plants often have the shape of a hyperboloid. At first glance, I thought that an obvious reason for this would be the smaller sectional area, meaning the tower would ...
5 votes
3 answers
3k views

Do heat pipes work in any orientation?

I think I understand how heat pipes work, and thus the following one has me flummoxed:- It's from a typical bulk order Chinese web site, but I've seem many similarly contorted arrangements. They are ...
1 vote
1 answer
80 views

Absorbing heat from a surface

I have a cold body of constant temperature A and a hot surface several times it's area. What is the best way I can absorb the heat from that surface using A. Will sheets of metal like alluminium or ...
0 votes
1 answer
91 views

Cooling system design of a heavy duty truck

I'm looking for information pertaining to the design of an engine cooling system in a heavy duty truck -- one that's used for long haul shipping. I've found some resources that provide details on the ...
0 votes
1 answer
79 views

How is heat transfer calculated for an aqueous salt solution?

I am familiar with using $\dot{Q}=c_p\cdot\dot{m}\cdot\Delta T$ to calculate the heat transfer rate of a fluid given a singular value for specific heat capacity (such as with water), but how do I go ...
-1 votes
1 answer
273 views

Liquid cooling system for Emrax 208 motor

I am on a student design team planning to build an electric motorcycle and we are planning to use an EMRAX 208 motor. We want to have liquid cooling for the motor but I cannot find any resources on ...
1 vote
0 answers
42 views

Motor part winding start

I have a BITZER compressor type 4GE-23Y-40P, with a part winding start option Nennspannung = nominal voltage = 380-420 Frequ = frequency = 50 Betr. strom = maximal operating current = 43.9 ...
1 vote
1 answer
46 views

If you have a small fan that blows hot air, and a larger fan that blows cold air against it, what happens to the hot air?

For context, I have a laptop that has a fan that sucks in cold air from the top on the left side (for cooling the cpu), and a fan that blows hot air out the bottom on the right side (for cooling the ...
2 votes
2 answers
144 views

Do the tubes of an automotive radiator flow in parallel or series?

The radiator in my car is damaged. One tube has a severe gash in it. I need to drive the car about 100 km before I can get a replacement radiator installed and coolant drains too fast to reasonably ...
-2 votes
3 answers
358 views

Are there differences between Ice Packs?

My girlfriend will get a refrigerator from the landlord, but right now she hasn't one. But she has a freezer. So we will get ice packs (images: 1, 2, 3) and use a cooling box for the time. Now I was ...
1 vote
1 answer
25 views

Has anyone built a heat powered vapor compression cooler?

I've had this idea in my head for a refrigeration cycle which is powered by heat, uses only one fluid, and whose only moving part is the fluid. I would like to know if my idea is new, or if it's ...
1 vote
1 answer
24 views

Efficiency loss for a cooling element for cooling parts smaller than the cold plate

I would like to cool a small device, with a size of 45x45 mm² and a thermal load of ~40 W. Currently, I have a cooling system available, capable of cooling a thermal load of 52 W, and a cold plate ...
1 vote
1 answer
2k views

Is evaporative cooling for a pool effective?

Hot humid east TX; Large subdivision pool is warm ,92F. A plan is being make to cool it with evaportive spray . One data point is : dry bulb= 82.0 , wet bulb = 79.7 F. This is likely typical average ...
6 votes
1 answer
599 views

What happens to silicone gaskets (siloxane rubber) in presence of ethylene glycol?

Normal sealings and gaskets are made from NBR for use in conjunction with aqueous solutions of ethylene glycol which are common coolants for various purposes. However to keep sulphur out of a ...
1 vote
1 answer
216 views

How can Geothermal heat a home using the ~55 degree heat source of underground to a more usual 72 degree inside temperature?

It has bugged me for a while. If the earth is a constant 50-60-odd degrees several tens of feet beneath ground, and houses (I assume; ours at least does) don't drop down to lower than those ...
1 vote
0 answers
36 views

BLDC Motor underwater ; weird behaviour

I recently was riding my e-bike (with a bldc hub motor) and decided to cool the motor (it -the stator- was approx 100-150 celcius I think) in the river. The controller is on the top of the bike and ...
1 vote
0 answers
457 views

How does the Xbox Series X "Heat-sink chassis" work?

I understand what a heatsink does, but I cannot wrap my head around how the newly announced Xbox Series X's heat-sink chassis works. From Xbox: Heat-sink chassis A heat sink is a non-electronic, ...
0 votes
1 answer
46 views

Building a cooling system for a kneading machine?

I wanted to modify my kneading machine. In fact it can work for at maximum 5 minutes, and then I have to let it cool for 20 minutes (it is a very cheap model), and it is a problem for me. So I was ...
2 votes
2 answers
100 views

Can I oversize my air conditioner if I use a two speed compressor?

The upper floor of my house has a split A/C, three-ton. When the temperature gets up above about 95 Fahrenheit, the unit can't ...
2 votes
0 answers
25 views

Energy/Efficiency Calculations for Large Multi-stage Package HVAC

I frequently use the Equivalent Full Load Hour (EFLH) estimation method to calculate the expected energy usage for commercial HVAC equipment. While not ideal, it works well enough to given an order ...
0 votes
0 answers
21 views

Estimating rate of drying by comparing identical process with different ambient humidity

We have a drying process where we take a thin bread product and cool it in a room at 11 C and 90% relative humidity. The product comes in at 80 C and comes out at 22 C. There is air blowing across the ...
0 votes
3 answers
60 views

How to dump moist air without heat backflow in evaporative cooling system?

I'm looking to design or purchase an evaporative cooling system for a small 70ft^2 California dorm room without air conditioning. This room has a single window and door to a large common space with a ...
1 vote
2 answers
87 views

Cooling Down Fridge Encased in wooden box

I'm currently working on a project which involves a small fridge encased in a wooden box. It's designed for hotels and the boxes vary slightly, but one common trait is that the box has an open vent ...