Retrofit scheme of air conditioning systems for overtime period in an office building

The project adds the air conditioning system for the overtime period on the basis of the original system to maintain the integrity of the original equipment and system as far as possible under the premise of independent operation of the air conditioning system, and does not affect the air conditioning system of the whole park. Three kinds of design schemes are proposed, and the modular air-source heat pump unit is selected in accordance with the principles of using the old as much as possible, cost control, energy saving and environmental protection. The air conditioning load, installation location and operation mode of the air conditioning system are presented. The selection of the air-source heat pump unit is elaborated, and its static recovery period is calculated. The scheme can meet the demand for air conditioning during overtime, and the static payback period is only 2.39 years.