Thermoeconomic evaluation of air conditioning system with chilled water storage

Hu, Lin; Li, Xinhong; Cheng, Peng; Xu, Bugong

doi:10.1016/j.enconman.2014.05.079

Cited by 15 publications

(5 citation statements)

References 10 publications

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“…Cold storage air conditioning technology has become a popular method for peak regulation. At present, water and ice are the most commonly used media for cold storage. However, the capacity of water cold storage is relatively low.…”

Section: Introductionmentioning

confidence: 99%

Effects of 2,5-Dihydrofuran on Hydrate Equilibrium Dissociation Conditions of CO₂

Zhang,

Sun

2023

J. Chem. Eng. Data

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Hydrate has advantages in the field of CO2 capture and sequestration, cold storage, etc. But CO2 hydrate formation needs very strict conditions, such as high pressure or low temperature conditions. 2,5-Dihydrofuran is used as a thermodynamic promoter to improve CO2 hydrate equilibrium conditions. At any temperature, the experimental results show that the equilibrium pressure of CO2 + 2,5-dihydrofuran + H2O is much lower than that of CO2 in pure water. The CO2 + 2,5-dihydrofuran + H2O system forms a structure II hydrate, while CO2 forms a structure I hydrate in pure water. With more addition of 2,5-dihydrofuran (>10 wt %), the reduction of hydrate formation pressure decreases at any experimental temperatures. At lower pressures, 2,5-dihydrofuran exhibits the properties of a water-soluble thermodynamic promoter, while at higher pressures, it shows the properties of an insoluble thermodynamic promoter.

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Section: Introductionmentioning

confidence: 99%

Effects of 2,5-Dihydrofuran on Hydrate Equilibrium Dissociation Conditions of CO₂

Zhang,

Sun

2023

J. Chem. Eng. Data

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“…They concluded that the addition of an ice thermal storage system into an existing CWES system significantly reduced the design day operating cost. Lin et al [11] presented a methodology to evaluate the thermoeconomic performance of a CWES system in which the return cool water (i.e., from the load side) was mixed with the supplied chilled water (i.e., from the chiller side). Operation cost and exergy consumption were cut down by 15% for the above system compared with the CWES system, which directly utilized chilled water at 5°C.…”

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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“…44 A case study performed in the subtropical climate of Australia reported that the TES, either as a partial storage or a full storage system, is techno-economically feasible and can be used for reducing the total electricity cost. 45 Lin et al 46 conducted an experimental analysis incorporating new operating strategies for an HVAC system integrated with chilledwater storage and reported that the technology can be implemented for energy savings simultaneously with power-cost savings. Zheng et al 47 proposed a new thermal storage operating strategy for a combined cooling, heating, and power system; they observed that the implementation of new strategy increases the maximum rate of total cost savings by 20.22%, whereas the minimum increase rate in total cost saving was observed 3.79%.…”

Section: Introductionmentioning

confidence: 99%

Analysis of different operating strategies of thermal energy storage with radiant cooling system

Singh

Mathur

Bhandari

2020

Intl J of Energy Research

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Thermal energy storage systems in building cooling applications have been explored extensively as a peak load-shifting technology. Thermal energy storage performance has been recognized and studied from an energy cost-savings point of view because of peak-valley price differences, but not many studies have been conducted from an energy savings viewpoint. This study experimentally investigates the performance of the energy storage-retrofitted to a ceilingtype radiant cooling system. To study the performance, a water-based storage system was designed and developed for an academic office building equipped with a radiant cooling system. The water in the storage tank was cooled to a certain storage temperature in the nighttime, and the same water was used during the daytime for meeting the cooling load. Different combinations of charging and discharging schedules were analyzed. The key objective of the study was to achieve energy savings and energy-cost savings simultaneously. This objective was accomplished by identifying the major factors contributing to the energy consumption of the storage-retrofitted cooling system and devising novel operating strategies, leading to an enhanced energy savings potential. Two operating strategies comprising 24 operating scenarios were compared and the storage was used to dispatch the load for 3 hours of the day as a full storage unit. Results showed that in hot and dry climate conditions, using the storage with the radiant cooling system offered energy savings of 3% to 14%. The energy-cost analysis was also performed using a time-of-day electricity tariff plan. The energy-cost savings varied from 17.5% to 22.4% for these operating scenarios.

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Thermoeconomic evaluation of air conditioning system with chilled water storage

Cited by 15 publications

References 10 publications

Effects of 2,5-Dihydrofuran on Hydrate Equilibrium Dissociation Conditions of CO₂

Effects of 2,5-Dihydrofuran on Hydrate Equilibrium Dissociation Conditions of CO₂

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

Analysis of different operating strategies of thermal energy storage with radiant cooling system

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Thermoeconomic evaluation of air conditioning system with chilled water storage

Cited by 15 publications

References 10 publications

Effects of 2,5-Dihydrofuran on Hydrate Equilibrium Dissociation Conditions of CO2

Effects of 2,5-Dihydrofuran on Hydrate Equilibrium Dissociation Conditions of CO2

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

Analysis of different operating strategies of thermal energy storage with radiant cooling system

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Product

Resources

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Effects of 2,5-Dihydrofuran on Hydrate Equilibrium Dissociation Conditions of CO₂

Effects of 2,5-Dihydrofuran on Hydrate Equilibrium Dissociation Conditions of CO₂