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Design, Thermodynamic and Economic Evaluation of a Solar Assisted Air Conditioning System for Energy and Carbon Saving

Heidari, Amir Reza | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50358 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Roshandel, Ramin; Vakiloroaya, Vahid
  7. Abstract:
  8. Evaporative cooling systems are of most common cooling systems which their electricity consumption is much lower than vapor compression cooling systems. Enhancement of these system’s performance could help to propagate these systems and also decrease the electricity consumption and corresponding emissions in large scale. In this thesis, first a modified cycle is proposed for evaporative cooling. Then, in order to use evaporative cooling in humid climates, a desiccant wheel is implemented in this modified evaporative cooler. As using evaporative cooling will cause high water consumption, a novel cycle is proposed for desiccant based evaporative cooling which is able to cover system water consumption by producing water of air’s moisture. Two different designs of this hybrid system is proposed, one of them is for humid subtropical climate and the other is for humid tropical climate. For evaluation of these systems, a dynamic hourly simulation is performed by linking TRNSYS and EES software programs. As one of the common applications of evaporative cooling systems is greenhouse cooling, dynamic hourly simulation is performed in addition to nominal simulation. Also, for evaluation of desiccant based evaporative cooling systems, they are simulated for a typical building. Based on the results, modified evaporative cooler is able to supply air with lower temperatures. Hence, for producing same cooling capacity, this system will results in 20% energy saving compared to simple evaporative cooler. Also, using this modified evaporative cooler in greenhouse, will cause to lower water consumption as well as lower air temperatures. Hybrid desiccant cooling system designed for humid subtropical climate, is able to cover all of the system water consumption by using air moisture condensation, so it is a water conservative system. Also using these systems will results in 41% energy saving during a month and 37% lower CO2 emissions. System payback time is calculated to be 2 years. The proposed system for humid tropical climate has 3.6% higher energy consumption during a month, which is because of higher natural gas consumption of the boiler compared to the conventional system, But the electricity consumption of the system is much lower than the conventional system. Using this system will cause 18% saving of CO2 emissions during a month. The water production of this system is 1.97 times more than water consumption. So this system could be used for water and cooling cogeneration. The investment cost of this system will return within the first 6 years of operation, but the cash flow will become negative at the tenth and eleventh years by purchasing a new desiccant wheel, and will become positive again at the twelfth year
  9. Keywords:
  10. Energy Storage ; Energy Consumption Reduction ; Water Conservation ; Mitigation ; Carbon Dioxide ; Desiccant Cooling System ; Evaporative Air Conditioning ; Modified Evaporative Cooling System ; Water and Cooling Cogeneration

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