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In this paper the results of testing thermal parameters of the rock environment and measurement of borehole temperature profiles of the newly constructed experimental underground heat storage (BTES (Borehole Thermal Energy Storage)) in Paskov (Czech Republic) obtained with the TRT (thermal response method) and temperature measurement on boreholes at selected depth levels are summarised. The TRT measurement...
Integrating TES (thermal energy storage) in a CSP (concentrating solar power) plant allows for continuous operation even during times when solar irradiation is not available, thus providing a reliable output to the grid. In the present study, the cost and performance models of an EPCM-TES (encapsulated phase change material thermal energy storage) system and HP-TES (latent thermal storage system with...
Energy and exergy performance of adsorption storage system was studied experimentally for residential application. A fin-coated heat exchanger was adopted for a sorption bed to quicken the charging process. When the regeneration temperature was 70 °C, ambient temperature was 30 °C, HTF (heat transfer fluid) inlet temperature for the adsorption bed was 30 °C, results showed that the heat ESD (energy...
This work focuses on the transient numerical modeling of multi-pass shell-and-tube heat exchangers that apply single-phase fluids. A one-dimensional modeling approach is used for the heat exchanger ducts. The governing partial differential equations are solved numerically by applying the finite volume method. In particular, the commonly applied cell-method is used, which is presented in a flexible,...
This paper presents a novel application of a sensible TES (thermal energy storage) system for simultaneous energy conservation and water desalination in power plants. First, the TES mitigates negative effects of high ambient temperatures on the performance of ACC (air-cooled condenser) that cools a 500 MW CCPP (combined cycle power plant); next, the same TES satisfies the cooling requirements in a...
In recent years, sorption processes are increasingly gaining attention in the field of TES (thermal energy storage), owing to their advantages of high storage density and no significant heat loss during storage process. In this paper, a novel three-phase sorption cycle is proposed and evaluated for TES, to provide cold storage in summer and heat storage in winter. The uniqueness of the cycle is that...
The performance of a regenerative solid TES (thermal energy storage) system with enhancement heat transfer structures is analyzed. Thermal energy is transferred from a hot heat transfer fluid to the storage unit core elements during charge, and from the core elements to the cold heat transfer fluid during discharge. Herein, concrete as the solid storage material, nitrate solar salt as the heat transfer...
The melting thermal performances of MEPCM (microencapsulated phase-change material) composite plates were investigated experimentally. The effects of MEPCM particle fraction in the plate, PCM core fraction in a single MEPCM particle, volume fraction of high thermal conductivity additives on the temperature of heated and back surfaces, the temperature difference between both surfaces, and the melting...
The present study aims to investigate the solidification characteristics of water based NFPCM (nanofluid phase change material). The NFPCM was prepared by dispersing copper oxide nanoparticles and a nucleating agent in the base PCM (phase change material). The experiments were conducted at various bath temperatures and the NFPCM exhibited a significant reduction in solidification time of about 35%...
PCMs (Phase change materials) are used to enhance the thermal storage capacity of building walls, decrease indoor air temperature fluctuations, and shift peak heat transfer rates to off-peak times. PCM location within building walls is recognized to be critical for the optimum performance of the system. One possible integration of the PCM into a wall could be via a PCM-layer or “shield,” herein referred...
Kaolinite is one of the most naturally occurring industrial minerals, which has inherent advantages such as low cost, flame retardant, porous lamellar structure. In this paper, a novel FSPCM (form-stable phase change material) for thermal energy storage is prepared by absorbing LA (lauric acid) into the pores of IKL (intercalated kaolinite). Analysis techniques such as XRD (X-ray diffraction), FT-IR,...
The thermal energy storage characteristics of Cu–H2O nanofluids as a new PCM (phase change material) for cooling systems was investigated. The influence of the nanoparticle agent on supercooling of water PCMs was experimentally studied. The temperature distribution and the ice shape of the cold storage process were observed on line by using an Infrared Heat Camera and a High Speed Color Digital Camera...
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