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Indicate which component responsible for the production of cold in the cycle of a refrigerating unit or a chiller? evaporator or expansion valve?

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تم إضافة السؤال من قبل Omar ABDELHEDI , Energy Consultant , FLUENCO
تاريخ النشر: 2016/03/14
Muhammad Arsalan Siddiqui
من قبل Muhammad Arsalan Siddiqui , Associate Director (MEP) , JLL

cooling is achieved by expansion valve due to its throttling affect. If there is no expansion valve the evaporator will not work

 

Hamid K. Saberi
من قبل Hamid K. Saberi , Owner , HKS Engineering

The question probably needs a little bit  more explanation. In my opinion each component of  the 3 system  of cooling cycle as explained below are somehow  involved in the cooling process,  and the system cannot  achieve its purpose (cooling ) without  proper operation of each of the related  components.  Basically, the refrigeration of chiller has consisted of three different cycles which are completely separate systems.

1. chilled water system - The chilled water out of the evaporator circulates through the FCU (load and heat exchanger) and cold air blown out via fan. The temperature of the water as the median exchanger increases. The  water with higher temperature is pumps back to the evaporator via chillers' pump(s) .

2. Refrigerant system- The refrigerant system has low pressure and high pressure zone. The low pressure zone after expansion device, the refrigerant gas passes through evaporator and absorbs the heat of the chilled water (through shell and tube heat exchanger). Then heated refrigerant compressed through the compressor and now in high pressure zone(after compressor), enters condenser (the second heat exchanger). 

3. Condenser system- The high pressure hot gas changes its heat through the condenser heat exchanget to the other median (water or air) depending to the chiller, air or water cooled system. The hot compressed gas after passing the condenser changes the phase to the liquid. Liquid refrigerant passes through the expansion device and changes the phase to gas which can absorb heat. The cycles repeats again and again.

 

Sherif Mohammed Ibrahim
من قبل Sherif Mohammed Ibrahim , Senior Mechanical Technical engineer , Al-Latifia Trading & Contracting Company

Condenser responsible for condensing refrigerant ------ latent heat removal

Expansion valve responsible for decrease refrigerant temperature -------- sensible heat removal

Evaporator responsible for evaporate refrigerant ----------- latent heat gain

ahmed wali
من قبل ahmed wali , مهندس موقع , شركة المقاولات الكهروميكانيكية م/ أحمد والي

Evaporator Is resposible for cooling

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