Sensible Heating of the Air through a constant area duct. Sensible heating is a process in which the temperature of air is increased without changing in its specific humidity. During this process, the temperature of the air is increased due to the heating coil heated the area of the duct. This process of sensible heating can be represented on the psychrometric chart, as shown by a horizontal line 1-2 from left to right. The line starts from the initial DB temperature of air and ends at the final temperature extending towards the right. (Refer to the figure below). In addition, during this process the sensible heat, Dry Bulb and Wet Bulb temperature of the air increases while latent of air, and the Dew Point temperature of the air remains constant. Sensible heating of the air is an important process when the air conditioner applications such as the heat pump to heat the air. In the heat pump the air is heated by passing it over the condenser coil or the heating coil that carry the high temperature refrigerant. In some cases the heating of air is commonly done to suit different industrial and comfort air-conditioning applications where large air conditioning system are used. https://www.brighthubengineering.com/hvac/41436-psychrometric-processes-sensible-cooling-andsensible-heating-of-air/ In this experiment it is basically demonstrate the flow of forced convective air element through a constant area duct. The fluid of air is being pumped through the duct and then it is heat across as it passes the heat of coils generated from the operating machine. In case we have to apply the amount of heater which set in 2 kilowatt and 4 kilowatt. The measure values for the td1 and td2 are recorded from the air conditioner reading. This is the air condition unit where we can locate and the temperature which we have to measure by adjusting the variable and control system of the conditioner. This is the control system of the air conditioner. Here we can switch on the heater power and adjust the variable switch to make constant air flow. It is also on this control system where we read the amount of the increase temperatures td1 and td2.