Shivam Yadav

Refrigeration and air conditioning-
here we will cover the syllabus of GATE,IES examination. 
Topic - Basic concepts related to RAC
2. VCRS (Vapour Compression and Refrigeration System)
3.VARS (Vapour Absorption Refrigeration System)
4.Refrigerant-theory
5.Air conditioning 
6.Psychrometry
and also covered the Previous year question of IES GATE SSC JE AND DMRC,and other PSUs

GATE (Graduate Aptitude Test in Engineering) 2020 & 2021 complete preparation with best educators. Know about the detailed syllabus, best books, exam pattern and dates, previous year question papers a

GATE & ESE

Hindi

(Hindi) Refrigeration and Air Conditioning (RAC)

Basic Thermodynamic Concepts

Thermodynamics

Mechanical Engineering

GATE & ESE - ME & CH

GATE, ESE and IIT-JAM

Ace the toughest competitive and government exams in India 

Test Preparation

Refrigeration effect, Refrigerant,COP, Reversed Carnot COP,Some Important point to remember

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Basic Concepts of RAC - Refrigerator, Heat Pump, Reversed Carnot COP, COP (in Hindi)

Overview of Refrigeration and air conditioning.Important topic for IES,GATE,SSC JE AND DMRC AND OTHER PSUs

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Overview of Refrigeration and Air-conditioning (RAC) (in Hindi)

Numerical problems of COP and Work input , reversed Carnot cycle

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Numerical Problems of Previously covered Topics of RAC (in Hindi)

Some more important numerical problems of previously covered topics of RAC ( Refrigeration and air conditioning)

Some Important points of Refrigeration and Air Conditioning (in Hindi)

VCRS, Compressor, Condenser, Throttling device, Evaporator,P-V,T-S,H-S diagram,COP calculation,

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VCRS: Vapour Compression Refrigeration System (in Hindi)

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Numerical problems of VCRS ,GATE Previous year question

Most important numerical problems of VCRS, Previous year question of IES,GATE

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Problems of Gate ,IES Previous year question on VCRS (VAPOUR COMPRESSION REFRIGERATION SYSTEM)

Reciprocating compressor-Volumetric efficiency , Compressor work required with clearance volume and without clearance volume

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Reciprocating compressor-Volumetric efficiency and work input required with clearance and without

Numerical problems of IES/ESE mains Previous year question related to reciprocating compressor with VCRS cycle

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Numerical problems of Reciprocating compressor in VCRS cycle,IES Previous year question

Actual COP calculation , Adiabatic efficiency,relative COP, superheating and sub-cooling - PREVIOUS YEAR QUESTION OF IES MAINS

Numerical problems of IES Mains Previous year question of VCRS cycle

Effect on thePerformance of vapour compression refrigeration system with variation of evaporator pressure, condenser pressure, superheating, subcooling ,also discussed wet compression over dry compression ,T-s diagram and P-h diagram

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Effect on Performance of VCRS,Dry Compression and wet Compression

Flash chamber in VCRS CYCLE, Heat exchanger in VCRS CYCLE,T-S and P- h diagram of sub-cooling in VCRS CYCLE

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Use of Flash Chamber and Heat exchanger in VCRS

Numerical problems of VCRS CYCLE WITH heat exchanger condition , GATE Previous Question

Numerical problems on VCRS CYCLE with heat exchanger , Important for ESE MAINS

Reversed Brayton Cycle/Bell Coleman Cycle/Ideal gas  refrigeration cycle- 
Why expander used instead of throttle valve ?
COP calculation of Reversed Brayton Cycle ,P-h,T-s,p-V diagram

Ideal Gas Refrigeration cycle/Reversed Brayton Cycle/Bell Coleman Cycle

Numerical problems of Reversed Brayton Cycle/ Bell Coleman Cycle/ Ideal refrigeration cycle, Previous year question of IES mains and GATE

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Numerical problems of Bell Coleman Cycle and also Previous year question of GATE AND IES

Refrigerant
Types of refrigerant
Designation of refrigerant 
(Saturated Hydrocarbons , unsaturated Hydrocarbons
Inorganic compounds

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Designation of Refrigerant (Saturated Hydrocarbons, Unsaturated Hydrocarbons, Inorganic Compound)

Desirable properties of Refrigerant (Selection of Refrigerant)
Thermodynamic properties-
Critical Temperature
Specific heat
Enthalpy of vaporization
Conductivity
Evaporator and Compressor Pressure
Freezing point
 Chemical properties
Physical properties
Refrigerant leak detection test

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Desirable properties of Refrigerant (Selection of Refrigerant)-Thermodynamic, Chemical, Physical

Vapour Absorption Refrigeration System (VARS)

VARS-Vapour Absorption Refrigeration System

Important Questions on Refrigerant and VARS SYSTEM

IES Previous year question on Refrigerant and VARS

Basics of air-conditioning- Psychrometric properties
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Air conditioning- Psychrometric properties

Psychometric properties
Dry bulb temperature
Saturated pressure of water vapour
Dew Point temperature
Relative humidity
Specific humidity
Degree of saturation

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Psychometric properties-Part 2 DBT,Psat,DPT, specific humidity,RH,%humidity,WBT

Psychrometric properties
1.Enthalpy of moist air
2. specific volume
Psychrometric Chart

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Psychrometric properties-part 3-Enthalpy & specific volume & Psychrometric chart

Important Numerical problems on pschrometric properties & also GATE Questions

Numerical problems on Pschrometric properties & Also GATE Questions

Psychrometric Chart
1.Constant DBT lines
2.Constant specific humidity lines
3.Constant dew point temperature line
4.Constant relative humidity curve
5.Constant specific enthalpy lines,WBT lines and Constant specific volume lines

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DBT lines, humidity ratio lines,DPT lines,RH lines, Enthalpy, specific volume & WBT lines

Psychrometric Processes
1.Sensible heating
2.Sensible cooling
3.Humidification
4.Dehumidification
5.Combination of Two 
6.Adiabatic or Chemical humidification
7.Adiabatic or chemical dehumidification
8.Adiabatic Saturation

Psychrometric Processes- Sensible heating/cooling, Humidification/Dehumidification, Chemical HU/DH,

Apparatus Dew Point
By pass factor
1.By pass factor of a heating coil
2.By pass factor of a cooling coil 
3.By pass factor of combined coil
Sensible heat factor
Value of Sensible heat factor for different conditions

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By Pass factor & Adiabatic Dew Point & Sensible heat factor

Important points 
Previous year question of IES/ESE on Psychrometric properties & processes

ESE Question on Psychrometric processes & Important point to remember

Analysis of Summer Air conditioning
Case1-Air passing through a cooling and dehumidification coil with no by pass factor (BPF=0)
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Analysis of Summer Air conditioning - air passing through cooling & dehumidification coil with 0 BPF

GATE PREVIOUS YEAR QUESTIONS on Air conditioning

Previous year Question of GATE on Air conditioning

Important questions on Air conditioning

Analysis of Summer Air conditioning – moist air passing through a 
1.Cooling and dehumidification coil having non-zero bypass factor
2.Coil having some given value of Apparatus Dew Point with zero bypass factor
3.Coil having some given value of Apparatus Dew Point with non-zero bypass factor

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Analysis of Summer air conditioning -cooling & DH coil with Non-Zero BPF & ADP with 0/non zero BPF

Numerical problems on air-conditioning (ESE mains)

Important problems on Air conditioning

Practice problems on Air conditioning-for GATE & IES

Practice problems on Air-conditioning

Practice problems on Refrigeration and air conditioning

Practice problems on Refrigeration and air conditioning (RAC)

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