Questions tagged [refrigeration]

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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 ...
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2answers
43 views

How to increase temperature of the condenser part in a refrigeration cycle?

I have made a refrigeration system at my home. I am using r134a as the refrigerant. I want to achieve a temperature of about 70-degree Celcius in the condenser part and 0-degree Celcius in the ...
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21 views

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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26 views

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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0answers
108 views

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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30 views

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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20 views

Where to connect the tubes on the refrigerator compressor to operate by using hand?

I am trying to operate the compressor of a refrigerator using my hand. I have opened the case of the refrigerator compressor and removed the part responsible for the compression. I have made a gearbox ...
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0answers
31 views

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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81 views

d40cy1 refrigerator compressor speed control resistor values

I have a bar fridge with a d40cy1 compressor in it. I can't find an manual for it. I would like to bypass the thermostat and speed control and force it to run continuously at its lowest speed. I ...
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5 views

How do I size a condensing unit for a commercial refrigerator having the following info:

McCall reach-in M# 4-4070C; S# M713863; 70 cu.ft. (very little info on this frig.) Operating temp range 35F-43F. Evaporator temp range probably is 20F-25F Currently set-up to operate with R22. I ...
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57 views

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 ...
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1answer
40 views

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 ...