Dew point evaporative cooling system | |
| Author | Phyo Khaw |
| Call Number | AIT Rspr no.ET-17-07 |
| Subject(s) | Cooling Evaporation control |
| Note | A research study submitted in partial fulfillment of the requirements for the Degree of Master of Engineering in Energy |
| Publisher | Asian Institute of Technology |
| Series Statement | |
| Abstract | Conventional vapor-compression cooling technologies dominate the air-conditioning market. They consume high quality (electricity) energy and use refrigerants that could be harmful to the environment. To address climate change, cheap, efficient use of energy and environmental friendly technologies for cooling are needed. This study was aimed to study the alternative method to produce cooling, namely the evaporative cooling system. Desiccant evaporative cooling has the high energy saving potential and is environmental friendly. To achieve comfort condition, desiccant materials are used to reduce humidity and evaporative coolers to cool the air. In the cooling technologies, dew-point evaporative cooling with liquid desiccant dehumidification system and thermoelastic cooling has highest energy saving potential. In evaporative coolers, dew-point evaporative cooling is better than direct and indirect evaporative cooling because it can reduce the air temperature to reach its dew point temperature. Dew-point evaporative coolers using M cycle with multi-stage cooling has the highest performance and wet-bulb effectiveness. Dew-point evaporative coolers has wet- bulb effectiveness of 80-120%. There are many design of dew-point evaporative coolers. Flow types are cross-flow and counter-flow. Exchanger structure types are plate-type and tube-type. Polyethylene is used as water-proof membrane. Wet-bulb effective is most important factor for evaporative coolers. Coolerado cooler is commercial type dew-point evaporative cooler. Its operational cost is much lower than conventional vapor-compression coolers but installation cost is quite the same. The performance of dew-point evaporative coolers depends on the inlet air conditions (mainly humidity). They save huge amount of energy but have fresh-water consumption of 2.5 gal/ton.h. Desiccant dehumidification systems are used to reduce humidity of the inlet ambient air of evaporative coolers. Liquid dehumidification is better than solid dehumidification due to energy saving. Capturing back the water from the exhaust saturated air of evaporative cooler of new system has some advantages. No water is need for evaporative cooling process. The performance of system will be higher because there is no need to rely on the weather due to the water and working air recycling in the system. However, this system has huge disadvantages. Evaporative coolers get the cooling load from latent heat of evaporation of water to the ambient air. New system will not get energy from ambient but from dehumidification process like solar, heat and electricity. The efficiency of this system will be higher than vapor- compression system because of no mechanical parts like compressor. Many further researches should be done on capturing water from saturated air. |
| Year | 2017 |
| Corresponding Series Added Entry | |
| Type | Research Study Project Report (RSPR) |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Energy and Climate Change (Former title: Department of Energy, Environment, and Climate Change (DEECC)) |
| Academic Program/FoS | Energy Technology (ET) |
| Chairperson(s) | Kumar, Sivanappan |
| Examination Committee(s) | Salam, P. Abdul;Singh, Jai Govind |
| Scholarship Donor(s) | Greater Mekong Subregion (GMS) Scholarship |
| Degree | Research Studies Project Report (M. Eng.) - Asian Institute of Technology, 2017 |