Questions tagged [cooling]
The cooling tag has no usage guidance.
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Understanding chiller performance curves
Recently I was tasked with some chiller-related tasks and I need to understand the performance model. More specifically, I am interested in the EIR EnergyPlus chiller model.
The chiller's performance ...
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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 ...
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Choosing sides of a shell and tube heat exchanger for oil cooling
I recently took a quiz from POWER magazine that asked the following question:
In a typical cooling system for lubricant oil in a gas turbine, which configuration is preferred to prevent leaks and ...
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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 ...
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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 ...
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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 ...
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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
...
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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 ...
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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, ...
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Ventilation requirements of a closed housing of a video wall
Our company builds rather large video walls that are driven by computers next to them. In one of our current project the size of the installation is 21 55" displays side by side in portrait mode and 4 ...
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How to estimate cooling time of pipe due to inner flow (instationary heat transfer)
I have to determine the cooling time of a pipe from its initial temperature $\vartheta_{\text{wall,}1}=500 \text{ °C}$ to the temperature $\vartheta_{\text{wall,}2}=150 \text{ °C}$. The cooling ...
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Calculating heat transfer in a cooling loop
Imagine a closed pipe like below, filled with a liquid. The pipe is copper. Then imagine a small point heat source of X watts applied to the outside of the pipe in the position shown. Heat warms the ...
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Best way to cool a tank of milk
I am not sure if I can ask this here - if not let me know which stack would be appropriate. I am currently in the process of making a robot that can make a cup of tea. However, I am having trouble ...
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Should I put the peltier module at the bottom of the aluminum block?
I'm new to this project. We have an ice chest with a cooling and warming system attached on its lid. The switches etc. were corroded because the lid is very old. It has been sitting around for years ...
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Temporary moving of Cooling Towers from roof
I am working on the replacement of 2 air cooled cooling towers at a hospital. the cooling towers are located on the roof, whilst the water-cooled chillers are located in a plantroom in the basement. ...
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Material suited for fixing leakage in liquid nitrogen dewar
I need to fix a leak on the inside of a liquid nitrogen dewar which acts as the coolant tank for a spectroscopy CCD camera. Due to the design of the camera, I unfortunately can only access the inside ...
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Does 'Jet Impingement Cooling' always cool?
I understand that by using jet impingement cooling, we can achieve a high convective heat transfer rate, but there is also a stagnation region where the kinetic energy of the jet will be converted to ...
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The application of a Fluid (air) cooler on 20mm product, equations for temperature, moisture content and relative humidity (maybe modelling)
I currently have a fluid bed cooler which is cooling fine powder (around 20mm) product which enters upto 80 °C (minimum 40 °C) and leaves at a maximum of 25 °C. The mass flow rate is about 1200 kg/h. ...
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Is this proposed addition possible for an evaporative cooler?
Check the image attached below. This is a typical evaporative air cooler design. My proposed addition to this design is to retrieve the water back. What if we guide the evaporated water through a tube....
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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How to achieve successful Peltier cooling
I'm using a TEC12706 Peltier module for making a cooling setup. The hot side rejects heat to a Cooler Master Hyper 410R cooler and the cold side fin gets cold enough to form water condensate on itself....
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Developing a model of rate of cooling of steel tube in air
I am trying to develop an equation to determine the cooling rate of a steel tube in air. I'm using Fourier's Law, Stefan-Boltzman Law, Newton's Law as well as the specific heat capacity equation. The ...
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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 ...
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Why is there a MIN and MAX marking on a car coolant bottle?
This question was initially posted in physics stack exchange, then the mechanics stack exchange but I think it's more appropriate for engineering section instead.
I've always thought the minimum and ...
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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 ...
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