Category: Refrigeration And Air Conditioning

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… Continue reading Difference Between Split and Window ACs

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… Continue reading Split 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:

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… Continue reading HUMAN COMFORT CONDITIONS

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.… Continue reading AIR WASHERS

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… Continue reading Mixing of Air Streams

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… Continue reading Heating and Dehumidification

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… Continue reading Cooling and Humidification

During winter it is essential to heat and humidify the room air for comfort. As shown in Figure 8.11, this is normally done by first sensibly heating the air and then adding water vapour to the air stream through steam nozzles as shown in the figure. Figure 8.11 Heating and Humidification Process Mass balance of water vapour for… Continue reading Heating and Humidification

It is defined as the ratio of sensible to total heat transfer rate (Qt), i.e.,   SHF = Qs/ Qt = Qs/(Qs + Q1)   From the above equation, we can observe that a SHF of 1.0 corresponds to no latent heat transfer and a SHF of 0 corresponds to no sensible heat transfer. A SHF of 0.75−0.80 is quite common in… Continue reading Sensible Heat Factor (SHF)