Questions tagged [refrigeration]
The refrigeration tag has no usage guidance.
19
questions with no upvoted or accepted answers
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Why is there limited use of Y (Wye) fittings in a refrigeration system?
I'm a Mechanical Engineering intern currently working in HVAC and Refrigeration for grocery stores.
I'm looking into ways, with lower energy losses, to encourage equal flow distribution at liquid pipe ...
2
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2
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150
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Copper pipe for brine water block ice system
I am looking to replace copper pipes from a brine water block ice system .
The pipes needed are 5/8 but wonder what wall thickness it should be.
They should be thick enought to withstand 60 psi ...
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2
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42
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How does an expansion valve cool fluid?
How does fluid loose temperature after leaving an expansion valve in a refrigeration cycle? Where does this heat go?
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1
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What is the behaviour of water at a pressure reducing valve (PRV)?
Suppose I pass water through a pressure reducing valve, which can lower the pressure enough for the water to boil, will the water fully boil? If so, what would happen if that vapour passed to a tube, ...
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Working principle of Ranque–Hilsch Vortex Tube
I am not able to understand the reason for temperature separation and flow reversal in a counter-flow vortex tube refrigeration system.
As per some sources, "Compressed air is passed through the ...
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How does compressor ensure that rfgnt exiting the compressor exits at sufficient pressure such as its condensation tmp is always > otsd air temp?
I have very basic knowledge of the refrigerant cycle. I am talking about a Split system Home AC with an air cooled condenser. Assume a basic AC reciprocating or scroll compressor (i.e NOT a variable ...
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0
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63
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Can any Air rotameter be used for refrigerant gas by using equation conversion?
Currently, I am trying to find rotameter calibrated for R134A gas flow. However, most companies only sell rotameter or variable area flowmeter for water/Air/Nitrogen flow. Is it possible to use any ...
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79
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DC Inverter motor AC utilization category
I am looking at specs of an air conditioner unit. It uses DC inverter technology and maximum current listed as 21.5A
So are DC inverter motors considered resistive or inductive? What utilization ...
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274
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Adjusting the pressure of the condenser and the evaporator
The picture below shows a refrigeration unit
I was reading the operation manual of this unit. It is written that the pressure of the condenser is controlled by the water flow rate. Reducing water ...
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The Volumetric Flowrate Under Suction Condition
For a National Board Exam Review:
An air conditioning plant with a capacity of $400$ $kW$ of refrigeration
has an evaporating and condensing temperature of $3$ $^oC$ and $37$ $^oC$
respectively....
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1
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55
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What's the lowest ambient temperature a refrigerator will work in?
Assuming a standard domestic refrigerator that uses R134a, I can see only two reasons a vapor-compression cycle wouldn't work. Either the ambient temperature is so low that the R134a freezes in the ...
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Suggestions for estimating Heat Load (watts) in an evaporator (antifreeze - hot fluid, R744 - cold fluid)
I am working on simulating an evaporator for an R744 refrigeration cycle.
Here, I have inlet conditions of R744 with low pressure (around 30 bar) and low temperature(-8°C) and that of antifreeze (35% ...
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42
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Home freeze drying
I want to make a freeze dryer to preserve fruits/foods.
I can get a vacuum chamber here: https://www.aliexpress.com/item/1005002865276963.html
and i can put that into a chest freezer.
I had a look at ...
0
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1
answer
258
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Why should a refrigerant have low melting point?
I have been reading about refrigerants lately. I understand that a refrigerant should have a low boiling point; however, I don't understand why it should have a low melting point. My instinct was ...
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Why air cannot be used as a cooling medium in CO2 refrigeration system?
Can anyone please explain the reason for above question?
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139
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Does pressure/temperature drop in a funnel or nozzle with a gas being pumped through it by a fan
So, I was thinking about trying to build some kind of body cooling suit and started looking into the wonderful world of refrigeration systems. I've managed to get myself side-tracked pretty badly ...
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What if ammonia is used as a refrigerant for a refrigerator?
I have a refrigerator whose compressor configuration is:
power- 10hp
compression ratio- 10:1
I do not have expertise in this field, but I am curious if I use ammonia as a refrigerant instead of HFC-...
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Dimension of an evaporator coil
I need to cool 3 galons of water from 77 to 32°F to form an ice bank that I will use to cool beer (it is a noble effort, you see).
I figured I need to install a cooling capacity of 0.34 kw to lower ...
0
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1
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46
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How to compute the performance of a refrigerant?
As I understand it, there are 5 key factors that determine the performance potential of a refrigerant gas:
Vapor density
Enthalpy of vaporization
Thermal Conductivity
Critical temperature
Specific ...