Abstract
One of the most attractive reserves of enhancing the energetic efficiency of air conditioning systems (ACS) is to provide operation of compressors in closed to nominal modes by choosing the rational design refrigeration capacities and their distribution according to current thermal loading to provide closed to maximum annual refrigeration energy generation. Generally, the overall thermal load band of any ACS comprises the unstable load range, corresponding to ambient air precooling with significant load fluctuations, and a comparatively stable load part for further air conditioning from a threshold temperature to a target value. The stable thermal load range can be covered by operation of conventional compressor in closed to nominal mode, meantime ambient air precooling needs load modulation by applying a variable speed compressor. A proposed ACS enables a wide range of refrigerant flow variation without heat flux drop in air coolers and can be considered as advanced alternative to variable refrigerant flow systems.
Highlights
The efficiency of ambient air conditioning systems (ACS) performance depends on their loading and a duration of operation all the year round
The unstable thermal load range should be covered through refrigeration capacity regulation, the stable range – by operation of the refrigeration compressor practically in nominal mode
The annual refrigeration energy generated by refrigeration machine (RM) in response to current air conditioning duties is considered as a primary criterion for the choice of a rational design refrigeration capacity of ACS
Summary
The efficiency of ambient air conditioning systems (ACS) performance depends on their loading and a duration of operation all the year round. The higher loading and longer duration of ACS operation during a year, the larger annual refrigeration energy production according to conditioning duties. The rational design refrigeration capacity of ACS has to cover current thermal loads in response to actual ambient air parameters and to provide closed to maximum annual refrigeration production avoiding refrigeration machine (RM) and the whole ACS oversizing. In addition the method of ACS designing should provide rational refrigeration capacity distribution within ambient air processing. Issuing from this the overall thermal load of ACS can be divided into unstable load range, corresponding to ambient air precooling with significant load fluctuations, and a comparatively stable load part for further air conditioning to the target temperature. The unstable thermal load range should be covered through refrigeration capacity regulation, the stable range – by operation of the refrigeration compressor practically in nominal mode
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