Central air-conditioning system

Warehouses, machine rooms and working areas, where large amounts of heat transfer are needed, are air-conditioned with a central system. For cooling these spaces either direct refrigerant gas, or with cool-water produced with refrigerant gas compressor or, absorbtion unit, is used (Figure.13). The hot water or steam, required for heating in central system, is obtained from the heat recovery boiler (Figure.14).   

Source of heat transfer for cooling

One of the tasks of the air conditioning system is to adjust the temperature of the place it supplies by applying the most appropriate ventilation method. In order to reduce the ambient temperature to the set value, the water temperature is reduced to 5-12 °C by cooling system. Until the temperature of the air achieve to the set value the chilled water continues to pass through the cooling coil in the air handling unit. Marine Engineer is responsible to ensure the efficient and effective operation of all system elements that take place in producing chilled water between 5-7 °C and circulating in the cooling coils. He/she must set the correct operating values, make necessary adjustments, calibrate all sensors, monitor, analyze and define the operating values, make decision for correction and apply whenever necessary. A typical air-conditioning system, consists of main components and the connections made to the air handling units (AHU) for revitalization of the circulated air, is represented with the image below.

Figure.13 Cool water production system with refrigerant gas compressor