The impact of using chilled water storage systems on the performance of air cooled chillers in Kuwait

Sebzali, M.; Rubini, Philip A.

doi:10.1016/j.enbuild.2006.11.004

Cited by 34 publications

(8 citation statements)

References 8 publications

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“…During the charging period, from 02:00 to 04:00, the chiller operates at full capacity to charge the storage tank. This system design is effective where the peak cooling load is much higher than the average load and also the lowest initial cost compared to other operating strategies [9,10].…”

Section: Chiller Cooling Ratementioning

confidence: 99%

Study of the Performance of Air Conditioning System Incorporating Chilled Water Storage

Ali

Ismail

Ahmed

2011

JES. Journal of Engineering Sciences

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In the present study, an air conditioning system with a storage tank was constructed and tested. Along the 24 hrs, eight tank-charge cycles were performed to evaluate the effect of variation local ambient temperature on the system performance. A significant variation in the values of COP due to variation in local ambient temperature in Sohag city was recorded. There are two modes of chilled water storage, full-storage and partialstorage. This study deals with partial-storage mode. In this study, a comparison has been carried out between air conditioning system without chilled water storage and that with storage. Configuration of storage tank has a significant effect on system performance. Two storage tanks with aspect ratio of 1.1 and 2.2 were tested. A COP of 1.63 was achieved for the adopted system for no-storage mode. In partial-storage mode, the COP achieved was 1.73 in case of storage tank with aspect ratio 1.1, and 1.79 with aspect ratio 2.2. NOMENCLATURE C p Water specific heat, kJ/kg˚C Q s Stored cooling capacity, kJ COP Coefficient of performance W Energy consumption, kWh m Mass of water layer in storage tank, Kg ∆t Temperature difference taking place in the layer, C Q Cooling energy, kWh ρ w Water density, kg/m 3

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Section: Chiller Cooling Ratementioning

confidence: 99%

Study of the Performance of Air Conditioning System Incorporating Chilled Water Storage

Ali

Ismail

Ahmed

2011

JES. Journal of Engineering Sciences

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“…They also concluded that the nighttime operation of the mechanical chiller could increase the COP of the cooling chiller. Sebzali and Rubini [9] studied the effect of integrating the CWES system with air-cooled chillers and its impact on the energy performance for the Kuwaiti climate. They showed that the results for the peak design day, chillers operating with demand limiting, and load-leveling partial storage strategies resulted in 4% higher energy consumption than a conventional system.…”

Section: Introductionmentioning

confidence: 99%

Thermal Performance Study on a Sensible Cool Thermal Energy Storage System for Building Air-Conditioning Applications

Muthaiyan

Lakshmanan

Raj

et al. 2021

International Journal of Photoenergy

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In most developed and developing nations, nearly 40% of the energy generated is utilized in the building sector, in which nearly 50% of the energy is consumed by building cooling/heating systems. However, the energy requirement for building cooling/heating varies continuously with respect to time. Hence, in hot countries, if the cooling system is integrated with a storage system, the cooling system need not be designed for the peak load requirement. Further, this kind of storage system is very useful and economically beneficial in the scenario of dynamic electricity tariff, being introduced in many countries in the emerging renewable energy scenario to solve the grid stability issues. Further, it is very useful to promote microgrid with distributed renewable power generation. Considering the above, the major objective of the present research is to demonstrate the integration of the air-conditioning system with a sensible heat storage unit for residential applications. An experimental setup is constructed, and experiments were conducted to evaluate the heat exchange behavior during the charging and discharging process by varying the inlet temperature and the mass flow rate of the heat exchange fluid through the circuit. It is observed that the set temperature of the cool storage tank is to be maintained above +5°C to achieve better efficiency during the charging process. During the discharging process, the room could be maintained at the required comfort condition for a duration of 285 min with 29 cycles of operations between the set point temperature limits of 25°C to 28°C. When the inlet brine temperature of the cooling unit reached 20°C, in the next cycle, bringing down the room temperature again to 25°C could not be achieved. The results shown in this work are beneficial for efficiently operating the cooling system and useful in promoting renewable energy in the near future in the building sector. Also, the low-temperature sensible heat storage system is capable of maintaining the storage temperature at approximately +4°C, instead of -4°C normally employed in the case of latent heat-based storage system that allows higher performance in the sensible heat storage system.

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“…Results were used to probe some design guidelines regarding life-cycle cost and payback period under chiller priority and ice priority control strategies. The impact of using chilled water storage systems on the performance of air cooled chillers in Kuwait was studied by [3]. It was found that, demonstrate that chilled water storage systems can reduce the peak electrical load of a chiller in an air cooled air conditioning system by up to 100% and reduce the nominal chiller size by up to 33% depending upon the operating strategy adopted.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study for Using Ice in Air Conditioning to Reduce Peak Loads

Eid

Omara

Omar

2013

Port-Said Engineering Research Journal

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This paper provides an experimental debate about using ice in air cooling to reduce peak loads resulting from air conditioning. Three copper helical coils having the same surface area were used in the present work. The coils diameters are 5, 7 and 10 mm, coils lengths are 4.50, 3.22 and 2.26 m respectively. The three coils are have the same pitch circle diameter and different number of turns. Warm air have a temperature ranging from 40°C to 60°C was fed inside the coils immersed in slurry ice hours. The air flow rate was changed from 0.0008 to 0.0065 kg/s. The effects of Reynolds number and coil diameter on heat transfer characteristics were investigated. The results provided that Nusselt number, Nu, increases with the increase of Reynolds number for small tube diameter coil. Empirical correlations were found for both heat transfer and pressure drop as dimensionless groups in the range of experimental investigation.

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The impact of using chilled water storage systems on the performance of air cooled chillers in Kuwait

Cited by 34 publications

References 8 publications

Study of the Performance of Air Conditioning System Incorporating Chilled Water Storage

Study of the Performance of Air Conditioning System Incorporating Chilled Water Storage

Thermal Performance Study on a Sensible Cool Thermal Energy Storage System for Building Air-Conditioning Applications

Experimental Study for Using Ice in Air Conditioning to Reduce Peak Loads

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