Category: Advance Concept Mechanical Eng
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PROPERTIES OF FLUIDS
The study of properties of fluids is a base for basic understanding of flow or static condition of fluids. Some important properties of fluids are density, viscosity, surface tension, bulk modulus, vapour pressure, etc. Viscosity causes resistance to flow between two adjacent layers of fluid. Surface tension leads to capillary effects. Bulk modulus is involved…
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INTRODUCTION
Mechanics can be divided into three parts, such as mechanics of rigid body, mechanics of solids and mechanics of fluids. In mechanics of rigid body, it is assumed that there is no internal deformation in the body and we study about the static and dynamic position of the body subjected to external forces. In mechanics…
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Difference Between Split and Window ACs
The working principle of both window AC and split AC is same, but as they have different capacities, so both are used for different places. Split AC, being divided into two parts, has large capacity, so it is ideal for use in large offices and big rooms in the house. On the other hand, window…
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Split Air Conditioner
The split air conditioner comprises of two parts: the outdoor unit and the indoor unit. The outdoor unit consists of components like the compressor, condenser, and expansion valve fitted outside the room and the indoor unit consists of the evaporator or cooling coil and the cooling fan fitted inside the room. Split units have aesthetic…
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ROOM AIR CONDITIONER
Generally, two main types of room air conditioners used are window and split air conditioner. The details of working of these air conditioners are discussed below:
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HUMAN COMFORT CONDITIONS
Air conditioning is the process whereby the condition of air, as defined by its temperature and moisture content, is changed as per requirement. In practice other factors should also be taken into account especially cleanliness, odour, velocity, and distribution pattern. Comfort is a very subjective matter. The engineer aims to ensure comfort for most people…
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AIR WASHERS
An air washer is a device for conditioning air. In an air washer air comes in direct contact with a spray of water and there will be an exchange of heat and mass (water vapour) between air and water. The outlet condition of air depends upon the temperature of water sprayed in the air washer.…
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Mixing of Air Streams
Mixing of air streams at different states is commonly encountered in many processes, including in air conditioning. Depending upon the state of the individual streams, the mixing process can take place with or without condensation of moisture. Mixing Without Condensation: Figure 8.14 shows an adiabatic mixing of two moist air streams during which no condensation of moisture…
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Heating and Dehumidification
This process can be achieved by using a hygroscopic material, which absorbs or adsorbs the water vapour from the moisture. If this process is thermally isolated, then the enthalpy of air remains constant, as a result the temperature of air increases as its moisture content decreases as shown in Figure 8.13. This hygroscopic material can be a…
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Cooling and Humidification
As the name implies, during this process, the air temperature drops and its humidity increases. This process is shown in Figure 8.12. As shown in the figure, this can be achieved by spraying cool water in the air stream. The temperature of water should be lower than the DBT of air but higher than its DPT to…