Nptel video lecture topic list created by linuxpert. The chilled water system is also called central air conditioning system. It is the simplest form of an air conditioning system and is mounted on windows or walls. Design of central air conditioning system for a multy. The comfort chart see figure 88 is an empirically determined effective temperature index that has been published by the ashrae since 1950 the purpose of the comfort chart is to indicate the percentage of people feeling comfortable at various effective temperatures in the winter and summer.
At a lower temperature, molecular motion slows down and the growth of bacteria that causes food spoilage also retards. Special university course for future engineers lecture notes. Ac system employs the refrigeration cycle to achieve cooling or heating and ods is about the type of refrigerants used in the refrigeration cycle. Since the procedure is similar for winter air conditioning system, the winter air conditioning systems are not discussed here. It is a single unit that is assembled in a casing where all the components are located. What are some good books for refrigeration and airconditioning. As we know that there are three types of comfort air conditioning.
This warming and cooling of the air is usually referred to as winter and summer air conditioning. Refrigeration and airconditioning is the subject which deals with the. Feasibility study of solar air conditioning system article pdf available in heating, piping, and air conditioning 11. What are the different types of air conditioning systems. Hence, in order to maintain required comfort conditions in the occupied space an air conditioning system is required which can offset the sensible and latent heat losses from the building. Ocean engineering n p t e l national programme on technology.
There are several choices for the type of air conditioning systems, each satisfying the hvac objectives with different degrees of success. Load calculations, energy efficiency, and selection of technology are all explained in the context of air conditioning as a system, helping the reader fully consider the implications of design decisions. This is because the chilled water system can be networked to have multiple cooling coils distributed through out a large or distributed buildings with the refrigeration equipment chiller placed at one base central location. This system takes cool air and circulates it through a. The design con ditions are important because they form the basis for heating, ventilating and airconditioning hvac system design and energy estimation for buildings. Apr 09, 2011 essentials of air conditioning system temperature control effective temp 200c to 230c in summer effective temp 180c to 220c in winter for indian conditions 250c with 60% relative humidity to 300c with 45 % relative humidity, with air velocity not exceeding 10 mmin. Referring to figure 21, air at state point 1 65c dry bulb temperature and 57c wet bulb temperature experiences a temperature drop of 3c as it passes through the 1. Centralized vs decentralized air conditioning systems. Refrigeration and air conditioning notes free download as word doc. The central air conditioning system is comprised of a huge compressor that has the capacity to produce hundreds of tons of air conditioning.
Central airconditioning system the central air conditioning plants or the systems are used when large buildings, hotels, theaters, airports, shopping malls etc. Infiltration and iaq 29th lecture infiltration o infiltration and ventilation o infiltration due to stack effect, temperature difference and wind velocity o air change and crack length methods for estimating infiltration. John gorrie, gave up his medical practice to engage in time. We are here to provides you best study notes from best coachings like made easy, ace academy etc and from best institutions like mit open course, iit nptel, unep etc. Central air conditioning system this is the most important type of air conditioning system, which is. If the whole building is to be air conditioned, hvac engineers find that putting individual units in each of the rooms is very expensive making this a. Evaluate the applicability of evaporative cooling systems based on climatic conditions. Objectives after studying this unit, you should be able to know what is refrigeration and air conditioning. Aug 07, 2018 red dot air conditioning units uncategorized august 7, 2018 sante blog 0 70 r6101 mastercoolparts com 70 r9727 mastercoolparts com 70 r9777 mastercoolparts com reddot rear cargo hvac for sprinterpics of. Winter wind direction summer cooling in summer heating in winter only for heat unit dehumidifying in rainy or humid season in hot summer, air conditioner can cool down theroom air by transferring heat out. Know later, that refrigeration is an integral component of airconditioning. The air conditioning system is designed as per the latest american society of heating, air conditioning and refrigeration engineers standards. Based on the data furnished in the design basis, the air conditioning area works out to about2, 40,000 sft as such, a centralized air conditioning system is planned with a water.
Refrigeration and air conditioning is the subject which deals with the techniques to control the environments of the living and nonliving subjects and thus provide them comforts to enable them to perform better and have longer lives. Evaporative, winter and all year air conditioning systems. Design and analysis of air conditioning systems involves selection of suitable. However, designers often find it difficult to understand and to assess the precise effect these conditions may have upon the design and loadenergy performance of buildings. Cfm ot corrected total outdoor air quantity, cfm st total system airflow i. It is a unit, which consists of cooling and dehumidifying processes for summer air conditioning or heating and humidification processes for winter air conditioning. Winter air conditioning system authorstream air conditioning system nptel air conditioning system winter in air conditioning system winter in.
Getting introduced to the air conditioning industry is a major issue, since air conditioning industry interacts in almost every application in our life. Window air conditioner is sometimes referred to as room air conditioner as well. If the whole building is to be air conditioned, hvac engineers find that putting individual units in each of the rooms is very expensive making this a better option. Air conditioning seminar report pdf download we see that the air condition unit can be used to demonstrate a number of important principles in the control of the environment for human comfort industrial and other purposes. Summer air conditioning systems winter air conditioning systems all year air conditioning systems module. Central air conditioning system this is the most important type of air conditioning system, which is adopted, when the cooling capacity required is 25 tr or more. First, i cant see what country you are from but if you are in the u. Describe a typical air conditioning system and discuss the need for fixing suitable. Describe various air cycle refrigeration systems section 9. The mixed air passes through a filter to remove dirt, dust and other impurities. The total corrected outdoor air requirement for central systems supplying spaces with different ratios of outdoorairtosupplyair is determined from the following. Chapter 7 heating, ventilation, and air conditioning 127 figure 73 air conditioning with the vapor compression cycle the exterior, air cooled condensing unit should be kept free from plants and debris that might block the flow of air through the coil or damage the thin fins of the coil.
Both power generation and refrigeration are usually accomplished by a system that. This is because the refrigerant actually carries the oil that lubricates the system and most importantly the compressor. Which is basically a large heat exchanger, by rejecting heat to a cooling. Know later, that refrigeration is an integral component of air conditioning. Central air conditioning is used for cooling big buildings, houses, offices, entire hotels, gyms, movie theaters, factories etc. These refrigeration and air conditioning rac study notes will help you to get conceptual deeply knowledge about it. A guide of heating and cooling load estimation, pdh online course m196 4pdh. Sep 23, 2018 winter air conditioning system authorstream air conditioning system nptel air conditioning system winter in air conditioning system winter in. Evaporative, winter and all year air conditioning systems nptel. When 1 pound of ice melts, it absorbs 144 btu, as latent energy.
What are some good books for refrigeration and air. Air conditioner year round system is the combination of heating and cooling. Outdoor design conditions for hvac system design and. Jul 20, 2016 40 videos play all refrigeration and air conditioning hussain saheb shaik 2 fundamentals of hvac basics of hvac duration. Essentials of air conditioning system temperature control effective temp 200c to 230c in summer effective temp 180c to 220c in winter for indian conditions 250c with 60% relative humidity to 300c with 45 % relative humidity, with air. Broadly the air conditioning system can be classified in two broad categories.
Summer air conditioning system pdf nptel sante blog. Society of heating, refrigerating and airconditioning engineers, u. Determine the properties of the air at state point 2 and compare them with those at state point 1. Air supplied to the conditioned space is heated and humidified in the winter air conditioning system to the required level of temperature and moisture content depending. Pdf feasibility study of solar air conditioning system. Refrigeration and air conditioning is the subject which deals with the.
Apr 19, 2016 central air conditioning system the central air conditioning plants or the systems are used when large buildings, hotels, theaters, airports, shopping malls etc. Working of winter air conditioning system the outside air flows through a damper and mixes up with the recirculated air which is obtained by the conditioned space. Mechanical refrigeration and airconditioning youtube. In the past, this was done by collecting ice in the winter and using its specific heat to cool as the ice melted. In a simplistic view, a heat pump is an air conditioner capable of running in reverse.
By winter air conditioner, i assume you mean one that heats the interior of a home. Thus from sensible heat balance equation, at balanced condition. This unit is used primarily to cool big buildings, houses, offices, entire hotels, factories, etc. Describe winter air conditioning systems and perform psychrometric. Nptel video lecture topic list created by linuxpert systems. Cooling and heating system is used for separate season summer and winter. In winter ac system, the inlet is heated by the heater, and in winter season due to less present in the air, we also need to add the moisture particle to the air, generally, a humidification system is added to maintain the moisture quantity. Chapter 7 heating, ventilation, and air conditioning. Below are the most common types of air conditioning systems and the process by which they operate. Mechanical engineering refrigeration and air conditioning nptel.
The window and split air conditioners are used for single rooms or small office spaces. This refrigeration unit has a double shaft fan motor with fans mounted on both sides of. Ramgopal department of mechanical engineering iit kharagpur. Cfm ot corrected total outdoor air quantity, cfm st total system. Selection criteria for air conditioning systems section 36. The control may be manual or automatic, in which case, a room thermostat. With ambient conditions showing high rh and the refrigerant unit in operation, the air passing through the system can be cooled to below its dew point temperature to precipitate some of its moisture onto the fins of the evaporator. Applied thermodynamics for marine systems online course.
Air conditioning system winter air conditioning system. The total corrected outdoor air requirement for central systems supplying spaces with different ratios of outdoor air tosupply air is determined from the following. If this is the case, one would call this equipment a heat pump. Chapter 7 heating, ventilation, and air conditioning 127 figure 73 air conditioning with the vapor compression cycle the exterior, aircooled condensing unit should be kept free from plants and debris that might block the flow of air through the coil or damage the thin fins of the coil. Nptel video lectures, iit video lectures online, nptel youtube lectures, free video lectures, nptel online courses, youtube iit videos nptel courses. If we run the air conditioning in the winter it will help to keep the system well lubricated and leak tight. It works winter and summer season so it called year round air conditioner.
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