Search results for "Direct expansion coil"

showing 3 items of 3 documents

On Thermoeconomic Diagnosis of a Fouled Direct Expansion Coil: Effects of Induced Malfunctions on Quantitative Performance of the Diagnostic Technique

2017

Thermoeconomic diagnosis represents a promising technique for the detection of common faults in refrigeration systems, which are responsible of degradation in their energetic performance. Recently, the authors have carried out a sensitivity analysis of the performance of this method to the thermodynamic conditions of inlet air and to the geometry of the direct expansion coil, in case of degradation induced by evaporator fouling. The analysis showed that the method is able to detect this fault, but sometimes its quantitative assessments are not satisfactory. In order to understand more in-depth the origin of such results and identify margins for refinement of the technique, this paper is aim…

EngineeringEngineering drawingThermoeconomic diagnosis;Evaporator fouling;Direct expansion coil;Exergy;Malfunction cost;Fuel impact;Induced malfunction;Intrinsic malfunction020209 energyEnergy Engineering and Power TechnologyMechanical engineering02 engineering and technologyEnvironmental Science (miscellaneous)lcsh:Technologylcsh:HD72-88lcsh:Economic growth development planningFuel impactThermoeconomic diagnosisThermoeconomic diagnosis Evaporator fouling Direct expansion coil Exergy Malfunction cost Fuel impact Induced malfunction Intrinsic malfunctionSettore ING-IND/10 - Fisica Tecnica Industriale0202 electrical engineering electronic engineering information engineeringInduced malfunctionExergyWater Science and TechnologyRenewable Energy Sustainability and the Environmentbusiness.industryDirect expansion coillcsh:TIntrinsic malfunction.Electromagnetic coilEvaporator foulingMalfunction costbusinessJournal of Sustainable Development of Energy, Water and Environment Systems
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Performance maps for an air-cooled air conditioning system as a preliminary instrument for the diagnosis of evaporator fouling

2018

During the past few decades, there has been increased interest in the development of automated approaches for detecting and diagnosing faults in air conditioning systems. One diagnostic approach involves the use of exergy analysis. As a first step towards understanding the application of exergy analysis to diagnostics, this work is focused on the thermodynamic and exergy analysis of a direct expansion air conditioning system used in small commercial building applications. The analysis was carried out by means of experimental activities on a 17.5 kW rooftop unit installed at the Herrick Laboratories, Purdue University, Indiana (USA). The system under investigation was equipped with a variabl…

Settore ING-IND/10 - Fisica Tecnica IndustrialeDirect expansion coil thermoeconomic diagnosis exergy performance map evaporator fouling
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Thermoeconomic diagnosis of air conditioning systems: experimental assessment of performance for improved reliability

2018

Thermoeconomic diagnosis is an exergy-based fault detection and diagnosis technique which has been recently extended to air conditioning systems. So far, developments of this technique have relied only on simulation data without being evaluated using real data. For the first time, this work aims at assessing the performance of thermoeconomic diagnosis using experimental data obtained from a five-ton packaged rooftop air conditioning unit (RTU) installed at Herrick Laboratories, Purdue University. The RTU was tested in psychrometric chambers under a wide range of operating conditions and fault levels. The following faults were investigated: (i) evaporator fouling, (ii) condenser fouling and …

Thermoeconomic Diagnosis exergy direct expansion coil evaporator fouling condenser fouling multiple faultsSettore ING-IND/10 - Fisica Tecnica Industriale
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