abstract
The ETS-10/water pair was explored for the first time for cyclic adsorption heating purposes, with modelling and simulation studies. Measurements of water adsorption equilibrium properties were carried out, and, for the first time, the effective thermal conductivity and specific heat capacity of ETS-10 were measured. The experimental results were used for the modelling and simulation of an adsorption heating unit A model was developed, which contemplates adsorption equilibrium, one-dimensional heat and mass transfer in the bed, heat transfer in the external film, and intraparticle mass transport. From the numerical simulations, the coefficient of performance (COP) and specific heating power (SHP) were calculated, which allowed evaluating the heating performance Of the adsorption unit. The bed thickness, adsorbent regeneration temperature, and heating thermal fluid temperature influence considerably the cycle time and cyclic adsorption loading swing, thus impacting on COP and SHP. For three simulated cycles differing in bed thickness, COP values in the range 1.36-1.39 were obtained, which are close to the estimated ideal value of 1.41; the corresponding SHP ranged from 934 to 249 W kg(s)(-1). Based on sensitivity studies, a good compromise is required between the bed thickness, regeneration temperature, and the heating fluid temperature in order to meet superior performances of the system. (C) 2015 Elsevier Ltd. All rights reserved.
keywords
THERMAL-CONDUCTIVITY; PUMP; ZEOLITE; REFRIGERATION; TECHNOLOGIES; MODEL; TIO2
subject category
Thermodynamics; Energy & Fuels; Engineering; Mechanics
authors
Pinheiro, JM; Valente, AA; Salustio, S; Ferreira, N; Rocha, J; Silva, CM
our authors
Anabela Tavares Aguiar Valente
Principal Researcher
Carlos Manuel Silva
Associate Professor
Joana Marcelino Pinheiro
PhD Student
João Rocha
Full Professoracknowledgements
The authors are grateful to Bosch Thermotechnology for a research grant to Joana M. Pinheiro. This work was developed in the scope of the project CICECO-Aveiro Institute of Materials (Ref. FCT UID/CTM/50011/2013), financed by national funds through the FCT/MEC and when applicable co-financed by FEDER under the PT2020 Partnership Agreement. The thermophysical characterisation of ETS-10 was supported through the project