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Why knowing the superheat and subcooling are very useful in HVAC or AC system?

Ideal superheat and subcooling affects the operational performance of AC /Chiller units.

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Question added by Tom Escosa , HVAC Engineer , ADNOC
Date Posted: 2015/02/18
Fikry Abdul Wahid
by Fikry Abdul Wahid , Mechanical Engineer , YKK

The purpose is to know the enthalphy for each process i.e in condenser, compressor and evaporator. By knowing this, you can choose a suitable design for the three components.

Jawwad  Shah Shah
by Jawwad Shah Shah , Sr. Electrician , Imtiaz Super Market DHA Branch

The right anwer because we prefer AC system, because easily convert into DC.

Ahmed Gahlan
by Ahmed Gahlan , Senior Technical Engineer , Saudi Binladin Group. (Public Buildings & Airports Division)

Super heat and sub cooling are related to refrigeration status, both have impact on performance of refrigeration cycle, and on the Qadd in the evaporator and   Qrej from the condenser, the more sub cooled/super heated the water entering and leaving evaporator the more Qadd in the evaporator which maximize the performance and efficiency but on the other hand it also maximize the Qrej required to be removed in the condenser and thus maximize the condenser size and related fans or pumping power

ANAS AHMED MUSTHAFA
by ANAS AHMED MUSTHAFA , Facility Engineer , TDGISERV SERVICES

HVAC IS Better than AC .and HVAC is not affect human body but AC some people affect in skin allergy.

Muhammad Siddique
by Muhammad Siddique , General Manager Operation , Opera Textile Mills LTD.

Measuring superheat and sub cooling will tell us about the HVAC system performance and also we can find where is the gas in evaporator or in condenser side.

GAUTAM MODI
by GAUTAM MODI , Quality Assurance , Absolute Completion Technoliges

Due to following reasons, AC systems are preferred over DC systems: a. It is easy to maintain and change the voltage of AC electricity for transmission and distribution. Plant cost for AC transmission (circuit breakers, transformers etc) is much lower than the equivalent DC transmission c.

RISHAD  CH
by RISHAD CH , MEP MAINTENANCE ENGINEER , ST GREGOROUS INTERNATIONAL CANCER CARE CENTER UNDER QUADRANT TECHNOLOGIES

AC is more safe than DC because the current is moving 60 times per second

Ismael Hamad
by Ismael Hamad , Trainer , ANTONOIL DMCC , Lukoil project, WQ2

 superheat and subcooling it's very useful in HVAC or AC system to account the final temperature at the end of compression will depend on the working limits and the refrigerant. Taking these many factors into account, the refrigerating effect (A1 – D1 Evaporation) and the compressor energy (B1 – A1Compression) may be read off directly in terms of enthalpy of the fluid. 

To make proper sizing of compressor and condenser

jamal waziri
by jamal waziri , technical supervisor , ports and rail equipments

superheat and subcooling it's very useful in HVAC or AC system to account the final temperature at the end of compression will depend on the working limits and the refrigerant

Ahmed Tawfeek
by Ahmed Tawfeek , Software Engineer at AADC Control cneter (DMS) division , Al Ain Distribution Company

ac property of raising/lowering voltage using transformers . and 3 phase cpabilities of transfering more power

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