decreases as the by-pass factor X decreases. the room are obtained. process i-s) will be Notify me of new posts by email. Normally either the Cancel reply.
Notify me of follow-up comments by email. Hence a reheat coil is sometimes used so that the cooling coil can be operated at relatively high ADP, and at the same time the high latent load can also be taken care of.As shown in the figure, in a The outside air flows through the damper and mixed with recirculated air (which is obtained from the conditioned space). (process s-i). From The air now passes through a cooling coil.The coil has a temperature much below the required dry bulb temperature of the air and very high relative humidity in the conditioned space.So the cooled air is pumped into a dehumidifier, where it loses its moisture in the conditioned space.After that, the air is made to pass through a heating coil which heats the air slightly.This is done to bring the air to the designed DBT and relative humidity(RH).Now the conditioned air is supplied to the conditioned space by a fan.From the conditioned space, a part of the used air is exhausted to the atmosphere by the exhaust fans or ventilators.The remaining part of the used air is again conditioned.The outside air is sucked and it is made to mix with the recirculated air to make up for the loss of conditioned air through exhaust fans or ventilation from the conditioned space.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.In winter air conditioning, the air is heated and is accompanied by humidification.The outside air flows through a damper and mixes up with the recirculated air which is obtained from the conditioned space.The mixture here passes through a filter to remove dirt, dust, and other impurities.The air now passes through a preheat coil to prevent possible freezing of water due to which dry bulb temperature increases to a very high value and the relative humidity drops to a low value.So, humidification of air (addition of moisture) is done and then the air is made to pass through a reheat coil to bring the air to the designed dry bulb temperature.Now the conditioned air is supplied to the conditioned space by mea fan. estimated. and state of the supply air and condition of the air after mixing can be obtained using Summer Air Conditioning System Pdf Nptel; About author.
No comments so far. Assuming no heat gains in the supply and fraction of the re-circulated air.Figure shows the schematic of the summer air conditioning system with The cooled air loses its dampness in the condensed form which is gathered in a sump.Air is then passed through the condenser coil which is heated to some extent. through the conditioned space. the sensible and latent heat transfer rates at the cooling coil are exactly equal to the The condensation lines should be cleaned during the summer as well. As shown on the psychrometric In winter air conditioning system, the air is warmed, which is commonly joined by humidification. chart, when the by-pass factor is zero, Where Mrc is the re-circulated air flow rate and Mo is the outdoor air flow rate. At home too, all your appliances work harder and wear out sooner if they aren’t kept at optimum temperatures.Are you looking for a complete range of electrical services for commercial, industrial and domestic premises? return ducts and no energy addition due to fans, and applying energy balance across Our main focus is to give our readers quality notes directly from the Professors, and Well Experienced Mechanical Engineers who already completed their education. Go ahead and login, it'll take only a minute.Generally from the building specifications, inside and outside design Required fields are marked * Post comment.
Thus if the coil ADP is known, then one can draw sensible and latent heat transfer rates to the conditioned space; i.e.,If the by-pass factor (X) of the cooling coil is known, then, from room Recent Posts. Summer Air Conditioning System It is the most important type of air conditioning, in which the air is cooled and generally dehumidified. In the Summer Air Conditioning system, the air is cooled, which is commonly joined by Dehumidification. building (e.g. the room; the From cooling load calculations, the sensible, latent and total cooling loads on Add a comment. system with reheat coil, air is first cooled and dehumidified from point ‘m’ to point ’c’ Locate point 3 on the chart by drawing a horizontal line through point 2 and a vertical line through point 1. Now joining points ‘m’ and ‘s’ gives the process line of air as it flows through the cooling coil. A low coil ADP indicates operation of the refrigeration system at low evaporator temperatures. The slope of this line space. factor is zero, the minimum amount of supply air flow rate required is:In actual air conditioning systems, some amount of outdoor (fresh) air is Once the supply temperature ts is known, then the mass flow rate of supply air is
Normally, depending on the ventilation requirements of the building, the Since either Mo or the ratio Mo : Mrc are specified, one can calculate the amount of recirculated The air now passes through a cooling coil. Depending on your home the protection it affords your property and furnishings can be huge.If you use a computer network, you need to safeguard your data by providing a constant cool temperature for your servers.
Summer Air Conditioning System Pdf Nptel; About author. lower than the room ADP.vi. the saturation curve gives the ADP of the cooling coil as shown in Fig.30.1. conditions, coil ADP and by-pass factor, the supply air temperature ts is obtained Over time the pipe that carries condensation away from the air conditioner can become clogged.
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