R & Ac Machines detail TNDTE Diploma syllabus for Mechanical Engineering (Refrigeration And Ac) (RA), M scheme is extracted from TNDTE official website and presented for diploma students. The course code (32454), and for exam duration, Teaching Hr/week, Practical Hr/week, Total Marks, internal marks, theory marks, duration and credits do visit complete sem subjects post given below. The syllabus PDFs can be downloaded from official website.
For all other ref & ac 5th sem syllabus for diploma m scheme tndte you can visit Ref & AC 5th Sem Syllabus for Diploma M Scheme TNDTE Subjects. The detail syllabus for r & ac machines is as follows.
Rationale:
To learn about basic functions of different component of machines used in Refrigeration and Air conditioning with design considerations.
Objectives:
- To learn about functions, types, working, design consideration of Compressor
- To learn about functions, types, working, design consideration of Condenser and cooling towers
- To learn about functions, types, working, design consideration of Evaporator and expansion devices
- To learn about functions, types, working, design consideration of fans and blowers and learn about wiring diagram of R & A/C
- To learn about functions, types, working of filters, humidifiers and dehumidifiers.
Unit 1
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Unit 2
Condensers & Cooling Towers
(A) Condenser – functions of condensers, condensing or cooling mediums. Types of condensers – air-cooled, water – cooled, evaporative condensers. Fins – types – Condenser load – heat absorbed and heat of compression, heat rejection, sensible heat rejection or de-superheating, latent heat rejection, sub cooling -representation in p-h chart, condenser load calculation using Heat rejection factor (HRF) and compressor capacity, use of THR, total heat rejection specified by compressor manufactures, fundamental heat transfer equation of condenser capacity, quantity and temperature rise of condensing medium, Temperature distribution or profile, Liquid receiver Air cooled condensers – relationship between face area, air quantity and air velocity, effect of air velocity on heat transfer co-efficient and pressure drop, power requirements of fan or blower, range of air velocities in commercial condensers, construction & working of natural convention air -cooled condensers, types of forced convection aircooled condensers, Chasis mounted and remote air – cooled condensers, Water – cooled condensers – waste water system, recirculated water system, water circuit connected for series flow, water circuit connected for parallel flow, fouling rates, factors influencing fouling rates. Construction working & applications of double tube or tube- in-tube, shell-and -coil, and shell-and-tube coater – cooled condensers. Simple problems – involving calculation of condenser capacity, quantity of air, quantity of water, velocity of cooling medium, temp. rise of cooling medium- installation procedure – Evaporative condenser – cooling mediums, construction and working.
(B) Cooling towers Cooling towers – functions of a cooling tower, basic principle involved in cooling of water, factors affecting rate of evaporation of water in a cooling tower, minimum possible temperature to which water can be cooled in a cooling tower, tower range, approach, efficiency, condenser by pass – relationship between tower flow rate, tower range, condenser flow rate and temp. rise in condenser. Types of cooling towers -construction & working of Natural draft of atmospheric spray tower, types of Mechanical draft cooling towers – construction, efficiency and working of forced, draft cooling tower & induced draft cooling tower. Simple problems in range, approach & efficiency.
Unit 3
Evaporators & Expansion Devices
(A) Evaporators Evaporators – Main functions. Types of construction – bane -tube, plate, surface, advantage of fins, finned, internal fin and external fins, criteria for selecting internal fins, external fins or bane tubes, plate type evaporators, brazed plate evaporator Liquid Chiller tube Construction & working of shell and tube evaporator, shell and coil evaporator, tube-in-tube flooded evaporator. Natural convection evaporators and forced convection evaporators, direct expansion evaporators – simple problems – accumulators
(B) Expansion devices Functions – dry hand expansion valve expansion evaporator controls -Automatic Expansion valve, Thermostatic expansion valve, electronic expansion valve – construction, pressures equilibrium method of control working and operating characteristics – when cooling load increases, when cooling load decreases, when compressor is switched on and when compressor is switched off. TEV with external quality – necessity of TEV with external equalizer, construction and working. Capillary tube – construction, working and operating characteristic. Flooded evaporator control – Construction and working of Low prefloat control and high pressure float control valve.
Unit 4
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Unit 5
Filters, Humidifiers & Dehumidifiers
(A) Filters : Function of filters, impurities in air – dust, fumes, smoke, fogs, pollens, bacteria. Effects of dust on health. Methods of cleaning air – air filtration, sterilization, lonigation odour suppression. Air-filters – Dry filters, viscous filters, wet filters, electric filters, centrifugal dust collectors.
(B) Humidifiers : by steam injection – steam injection type and electric steam generator. By Atomizing the coater – Atomization type, impact type, hydraulic separation type, mechanical separation. By Evaporating the water – pan & coil type, Heated Water type heated air type By air washing – spray type air washer humidifier.
(C) Dehumidifiers : Dehumidification – by reducing air temp. below DPT, spray type dehumidifier.
Text Books:
- Refrigeration and Air-conditioning by Arora & Domkundwar Danpat Rai & Sons Publications
Reference Books:
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For detail syllabus of all other subjects of BE Ref & Ac, M scheme do visit Ref & Ac 5th Sem syllabus for M scheme.
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