Round the clock cooling of an apartment
To calculate the capacity of the air conditioning plant required for round the clock cooling of an apartment, we need to consider the load of 300 MJ/day.

Calculating the cooling load
The cooling load can be calculated using the formula:
Cooling Load = Sensible Load + Latent Load

Sensible Load
The sensible load is the heat that needs to be removed to maintain the desired temperature. It can be calculated using the formula:
Sensible Load = Heat Gain from Conduction + Heat Gain from Infiltration + Heat Gain from Ventilation + Heat Gain from Solar Radiation + Heat Gain from Occupancy

Heat Gain from Conduction
Heat gain from conduction is the heat transferred through the walls, roof, and windows of the apartment. It can be calculated based on the thermal conductivity of the materials used and the temperature difference between the inside and outside.
Assuming proper insulation, the heat gain from conduction can be considered negligible.

Heat Gain from Infiltration
Heat gain from infiltration is the heat transferred through cracks, gaps, and openings in the apartment. It can be calculated based on the air leakage rate and the temperature difference between the inside and outside.
Assuming a well-sealed apartment, the heat gain from infiltration can be considered negligible.

Heat Gain from Ventilation
Heat gain from ventilation is the heat transferred due to the exchange of air between the apartment and the outside. It can be calculated based on the airflow rate and the enthalpy difference between the inside and outside air.
Assuming minimal ventilation requirements, the heat gain from ventilation can be considered negligible.

Heat Gain from Solar Radiation
Heat gain from solar radiation is the heat transferred through windows and other transparent surfaces due to sunlight. It can be calculated based on the solar heat gain coefficient of the windows and the solar radiation intensity.
Assuming proper shading and insulation, the heat gain from solar radiation can be considered negligible.

Heat Gain from Occupancy
Heat gain from occupancy is the heat generated by the occupants of the apartment. It can be calculated based on the number of occupants and the heat dissipation rate per person.
Assuming an average occupancy and heat dissipation rate, the heat gain from occupancy can be considered negligible.

Latent Load
The latent load is the moisture that needs to be removed to maintain the desired humidity level. It can be calculated based on the moisture content of the air and the airflow rate.
Assuming a dry climate or the use of a separate dehumidification system, the latent load can be considered negligible.

Calculating the cooling capacity
Since the sensible load and latent load can be considered negligible, the cooling load for round the clock cooling of the apartment is primarily determined by the sensible load.
A 1-ton air conditioning plant has a cooling capacity of approximately 12,000 BTU/h (or 3,516 watts).
Considering the low cooling load, a 1-ton air conditioning plant with a capacity of approximately 3,516 watts would be sufficient to meet the cooling requirements of the apartment.