“ENERGY AND EXERGY ANALYSIS OF MAISOTSENKO CYCLE FOR EVAPORATIVE COOLING”

PREPARED BY

HARDIK M. PATEL

THERMAL ENGINEERING(M.E.-STUDENT)

GUIDED BY

ASSO.PROF. V.K. MATAWALA

DEPARTMENT OF MECHANICAL ENGINEERING

SHREE S’AD VIDHYA MANDAL OF INSTITUTE OF TECHANOLOGY AND ENGINEERING

BHARUCH-393002

2012-2013International Conference on Innovations in Automation and

Mechatronics Engineering 2013 (ICIAME2013), 21-23 February 2013

G H Patel College of Engineering & Technology, Vallabh Vidyanagar - 388120, State: Gujarat, INDIA

INTRODUCTION The conventional evaporative cooling system

used in the dry and hot regions. This type of system gives the sufficient cooling. but the increased humidity of the air gives the

feeling

of discomfort The other way to overcome the problem of increased

humidity is use of indirect evaporative cooling system.

This system though handles the humidity properly. but the cooling obtained with the said system is less. On the other hand, vapor compression refrigeration

systems consume more electricity. some of the systems carry the potential to pollute

the environment. Also cost of such systems high.

CONTINUE….

In this context, a new system which uses the advantageous aspect of both the evaporative cooling system and minimizes the drawbacks has been put forward by Valeriy Maisotsenko.

He developed a new thermodynamic cycle known as “Maisotsenko Cycle”, It is also called as the “M-cycle”

which uses the simple cross flow heat exchanger and indirect evaporative coolers, but with a much different airflow

STEPS TO UNDERSTANDING THE MAISOTSENKO CYCLE

1. Review evaporative cooling. 2. Review the indirect evaporative

process. 3. Learn the Maisotsenko Cycle.

DIRECT EVAPORATIVE COOLING Evaporative coolers have

been used to lower the temperature of air by using the latent heat of evaporation, changing water to vapor

In this process, the energy in the air does not change. Warm dry air is changed to cool moist air

Heat in the air is used to evaporate water; no heat is added or removed making it an adiabatic process

INDIRECT EVAPORATIVE AIR COOLING Thermodynamically an

indirect evaporative air cooler passes primary or product air over the dry side of a plate and secondary or working air over the opposite wet side of a plate.

The wet side absorbs heat from the dry side by evaporating water and therefore cooling the dry side with the latent heat of vaporizing water into the air.

WHAT IS MAISOTSENKO CYCLE...? The Maisotsenko Cycle uses the same wet

side and dry side of a plate as described in the above indirect evaporative cooler but with a much different airflow creating a new thermodynamic cycle.

This cycle allows the product air to be cooled below the wet bulb and toward the dew point temperature of the incoming working air.

The Maisotsenko Cycle utilizes the psychrometric energy (or the potential energy) available from the latent heat of water evaporating into the air.

The Maisotsenko Cycle was realized in a uniquely designed plate wetting and channel system, which achieved optimum cooling temperatures and saturated working air with the highest enthalpy possible for the exhausted working air temperatures obtained.

HOW THE MAISOTSENKO CYCLE WORKS THERMODYNAMICALLYo incoming air I passes over

the dry side of the plates and then turns as the air II passes over the wet side of the plates and then exhausted out as air III

o As the air passes over the dry side of the plate, it is cooled by the water evaporating on the wet side or the latent heat of vaporization absorbs the heat form the plate

o The air stream in the dry channels is cooled by the same air stream in the wet channels reducing its wet bulb temperature

ACTUAL WORKING

WHY MAISOTSENKO CYCLE…? A fresh air is the only available healthy air as it is

not contaminated with certain hazardous impurities.

Refrigerated air conditioning works by recycling the same air over and over and progressively reduces its temperature. The space which is to be air-conditioned requires being a sealed system for recirculation. The air becomes stale and it can be carried from one place to another.

The Maisotsenko Cycle air conditioning constantly delivers fresh, cool air into the room. There is no recycling or recirculation of stale. Also, there is no need to shut the windows and doors or to restrict people movements to trap air.

Reason 1: Energy efficient Reason 2: CFC-free cooling Reason 3: Water savings Reason 4: Competitive initial cost

CONTINUE…

ENERGY SAVING APPLICATION

evaporative cooling, desiccant cooling, cooling pads concludes that M-cycle cools down the product air without any rise in humidity. This principle of M-cycle can find a very vital role in many applications of cooling. It may be directly or indirectly.

This includes air conditioning, water cooler, some turbines, heat exchangers, etc.

M-CYCLE APPLICATION

M-CYCLE

PRODUCING COLD

PRODUCING POWER

PRODUCING DRINKING WATER

HEAT RECOVERY

SOLAR SYSTEM

HAKAN CALISKAN, ET AL [1], “THERMODYNAMIC PERFORMANCE ASSESSMENT OF A NOVEL AIR COOLING CYCLE: MAISOTSENKO CYCLE”[2011]

thermodynamics assessment of the novel evaporative air cooling system based on Maisotsenko cycle which allows the product fluid to be cooled in to a dew point temperature of the incoming air.

Maisotsenko cycle’s wet-bulb and dew point effectiveness calculated

LITERATURE SURVEY

CHANDRAKANT WANI , ET AL, [2] A REVIEW ON POTENTIAL OF MAISOTSENKO CYCLE IN ENERGY SAVING APPLICATIONS USING EVAPORATIVE COOLING[2012] Regarding the Maisotsenko Cycle, evaporative

cooling, desiccant cooling, cooling pads concludes that M-cycle cools down the product air without any rise in humidity.

This principle of M-cycle can find a very vital role in many applications of cooling. This includes air conditioning, water cooler, some turbines, heat exchangers, etc.

CHANGHONG ZHAN, [3]“NUMERICAL STUDY OF A M-CYCLE CROSS-FLOW HEAT EXCHANGER FOR INDIRECT EVAPORATIVE COOLING”[2011] concludes that the effectiveness of a cross-

flow heat exchanger goes up by 16.7% if it is operated by using M-cycle for indirect evaporative cooler

ENERGY ANALYSIS IN ENGINEERING EQUATION SOLVER(EES)

EXERGY ANALYSIS IN ENGINEERING EQUATION SOLVER(EES)

RESULTSENERGY ANALYSIS

RESULTSEXERGY ANALYSIS

EXERGY INPUT RATE OF M CYCLE AT DIFFERENT REFERENCE TEMPERATURES

EXERGY LOSS RATE OF M CYCLE AT DIFFERENT REFERENCE TEMPERATURES

EXERGY OUT RATE OF CYCLE AT DIFFERENT REFERENCE TEMPERATURES

EXERGY DESTRUCTION RATE OF M-CYCLE AT DIFFERENT REFERENCE TEMPERATURES

EXERGY EFFICIENCY OF M-CYCLE AT DIFFERENT REFERENCE TEMPERATURE

ENTROPY GENERATION OF M-CYCLE AT DIFFERENT REFERENCE TEMPERATURES

VARIATIONS OF EXERGETIC COP OF M-CYCLE FOR DIFFERENT REFERENCE TEMPERATURES

CONCLUSION

Energetic COP of the cycle is higher than exergetic COP. Energetic COP of the cycle is calculated to be 2.78, while, maximum and minimum exergetic COPs of the cycle are obtained to be 0.3737 and 0 for reference temperatures of 0˚C and 23.88˚C, respectively.

Maximum and minimum exergy input rates of dry air are found to be 0.8434 kW and 0.78kW for reference temperatures of 0˚C and 23.88˚C, respectively, while maximum and minimum exergy input rates of water are calculated to be 0.004394 kW and 0.000813kW for reference temperatures of 0˚C and 23.88˚C, respectively.

REFERENCES

[1] Hakan Caliskan, et.al., “Thermodynamic performance assessment of a novel air cooling cycle: Maisotsenko cycle ”in International Journal of Refrigeration xxx (2011) 1-11 .

[2] Chandrakant Wani , Satyashree Ghodke, Chaitanya Shrivastava “A Review on Potential of Maisotsenko Cycle in Energy Saving Applications Using Evaporative Cooling.

[3] Changhong Zhan, et. Al., “Numerical study of a M-cycle cross-flow heat exchanger for indirect evaporative cooling”, Building and Environment 46 (2011) 657-668.

[4] B. Riangvilaikul, et. al., “An experimental study of a novel dew point evaporative cooling system” in “Energy and Buildings” 42 (2010) 637–644.

[5] Refrigeration and air conditioning, Version 1, ME, IIT, Kharagpur, chapter-31, Evaporative air condition system, (2008) pages 608-616.

ling”[2012].

REFERENCES

[6] An article: Four Timely Benefits of Indirect-Direct Evaporative Cooling.[7] “Maisotsenko-Cycle Enhanced Cooling Towers” an article by Gas Technology Institute.[8] http://www.idalex.com/technology/ how_it_works__engineering_perspective.htm[9] http://www.coolerado.com/news/life-below-the-wet-bulb maisotsenko-cycle[10] A. Bejan, Entropy generation minimization, crc press, NY[11] Arora C.P., refrigeration and air conditioning, 3rd edition, Evaporative cooling, (2010) ,chapter-19, pages 651-653.

THANK YOU!