Modeling of adsorption heat pump system based on experimental estimation of heat and mass transfer coefficients

Seol, Sung-Hoon; Nagano, Katsunori; Togawa, Junya

doi:10.1016/j.applthermaleng.2020.115089

Cited by 20 publications

(8 citation statements)

References 61 publications

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“…(6) Both the ORC and HP sub-systems are operated in subcritical region. (7) Isentropic efficiencies of the pump, expander and compressor are assumed to be 0.8. (8) The pinch point temperature difference of all heat exchangers is set to be 5 °C.…”

Section: Conditions and Assumptionsmentioning

confidence: 99%

“…Boman et al [6] developed thermodynamic and heat transfer models for initial screening of working pairs used in adsorption HPs, indicating that AX-21+ammonia was the best option for heating and further research was recommended on MOF+alcohol working pairs. Seol et al [7] presented models to predict performance of adsorption HPs with Atype silica gel and Wakkanai siliceous shale (WSS) as adsorbents, with results revealing that the COP could be improved by 6-17% when WSS was used relative to the system using A-type silica gel. Taslimi Taleghani et al…”

Section: Introductionmentioning

confidence: 99%

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Integrated organic Rankine cycle (ORC) and heat pump (HP) systems for domestic heating

Song

Olympios

Mersch

et al. 2022

34th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems (ECOS 20

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Space and water heating represent a significant share of the overall energy consumption in the domestic sector. Decarbonising heat, though challenging, is acknowledged as having a key role to play (as exemplified by the Domestic Renewable Heat Incentive launched in 2014 in the UK, amongst other) in achieving emissions reduction targets and alleviating problems related to energy shortage and environmental deterioration. Novel, highly efficient heating technologies have attracted increasing interest in this context, in particular in regions with colder climates and higher heating demands. Specifically, thermally-driven heat-pumping technologies are a promising solution to meeting energy-efficiency targets by increasing the effective heat-to-fuel ratio (HFR) of heating systems. In this paper, thermally-driven integrated organic Rankine cycle (ORC) and heat pump (HP) systems are proposed for domestic heating applications, in which the ORC system is driven by heat from fuel (e.g., gas) combustion and generates power to drive an air-source vapour-compression HP system. A heattransfer fluid is heated in the condensers of the two sub-systems to the required temperature for heat provision. Two system configurations with reversed heat-transfer fluid flow directions are presented and compared. Suitable, low global-warming-potential (GWP) working fluids for both the ORC and HP systems are considered and parametric optimisation is performed to determine optimal thermodynamic performance and system layouts. In a configuration in which the heat-transfer fluid flows first through the HP condenser and then through the ORC condenser in series, the HFR reaches values of 1.26-2.04 for air-source temperatures ranging from -15 to 15 °C and for heat provision temperatures from 35 °C to 60 °C. A performance enhancement up to 8-19% relative to the configuration with the heat-transfer fluid flowing in the reverse direction, i.e., through the ORC condenser and then the HP condenser in series, can be achieved. The specific investment costs of both configurations under typical conditions are around 600 £/kWth, which indicates that the proposed systems are slightly higher but still economically competitive with existing HP products available on the market, thus demonstrating the potential of exploiting such novel systems for domestic heating in practical applications.

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Section: Conditions and Assumptionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Integrated organic Rankine cycle (ORC) and heat pump (HP) systems for domestic heating

Song

Olympios

Mersch

et al. 2022

34th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems (ECOS 20

View full text Add to dashboard Cite

show abstract

“…Analysing the data in Table 3 [35][36][37][38][39][40][41], it should be noted that SGs are characterised by a surface development in the range of 650-1000 m 2 /g and a pore volume in the range of 0.3-0.5 cm 3 /g. Additionally, the silicas listed in Table 3 have pores with an average size of 0.9-3.2 nm.…”

Section: Silica Gelsmentioning

confidence: 99%

Adsorbents, Working Pairs and Coated Beds for Natural Refrigerants in Adsorption Chillers—State of the Art

et al. 2021

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Adsorption refrigeration systems are promising, sustainable solutions for many cooling applications. The operating range and the performance of an adsorption cooling cycle are strongly dependent on the properties of adsorbents, adsorbates, and bed coatings. Therefore, further research and analysis may lead to improved performance of adsorption coolers. In this paper, studies on working pairs using natural refrigerants and the properties of adsorbent coatings were reviewed. The selected working pairs were then thermodynamically characterised and ranked in terms of refrigerant evaporation temperature values. This was found to be a key parameter affecting the applicability of a given adsorbent/adsorbate pair and the value of SCP (Specific Cooling Power), COP (Coefficient of Performance) parameters, which are now commonly used comparison criteria of adsorption chillers. In the analysis of the coating studies, the focus was on the effect of individual parameters on the performance of the cooling system and the effect of using coated beds compared to packed beds. It was found that a fundamental problem in comparing the performance of different cooling systems is the use of different operating conditions during the tests. Therefore, the analysis compares the performance of the systems along with the most important thermodynamic cycle parameters for the latest studies.

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“…Overall, many studies on these systems focus on improving heat and mass transfer in the adsorber proving that the intensification of heat and mass transfer properties on the bed adsorber can be effectively obtained by preparing thin thickness adsorber bed [4] and using new [5] or highly conductive materials [6] such as carbon fibers [7] as well as consolidated composite adsorbents [8] [9]. The technique for preparing consolidated composite adsorbents consists of adding material with greater thermal conductivity [10] to the powder of the classic solid adsorbent. These techniques make it possible to design cooling units with improved power densities, [11] [12].…”

Section: Introductionmentioning

confidence: 99%

Study of Habitat’s Thermal Performance Equipped with an Adsorption Cooling Unit by Geothermal Heat Pump

El-Maktoume¹,

Chesneau²,

Diallo³

et al. 2021

JPEE

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This work concerns a modeling of habitat equipped with an adsorption cooling unit powered by a geothermal heat pump in the context of the climate of the Comoros Islands. Cooling unit is a simple system consisting of an adsorber, condenser and evaporator. The modeling of the habitat-air conditioning system was based on a description of heat and mass transfers. The first law of thermodynamics on the energy conservation using the analogies between heat and electrical transfers is used to establish the equations of the model. Zeolite-methanol pair and Dubinin-Astakhov adsorption model are used to describe the amount of adsorbed mass. The finite difference method applied to a point of the considered exchange surface is used to discretize equations and resolve them. The coupling of the system takes place through a convective transfer between the air inside habitat and the evaporator's surface. This article presents results for typical November days in Comoros. Different temperatures of habitat with and without a cooling unit show that using the adsorption cooling unit can help lower internal temperatures. We observe a temperature difference of 2.14 K in particular at 2 p.m., if the air conditioning starts at 8 a.m. The influence of the input parameters on the air inside the habitat makes it possible to assess the impact on indoor comfort. The COP th can reach 0.46. However, we can get a high performance if we optimize temperature thresholds. These show that this type of cooling unit can help improve the habitat thermal comfort in a tropical and dry climate.

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Modeling of adsorption heat pump system based on experimental estimation of heat and mass transfer coefficients

Cited by 20 publications

References 61 publications

Integrated organic Rankine cycle (ORC) and heat pump (HP) systems for domestic heating

Integrated organic Rankine cycle (ORC) and heat pump (HP) systems for domestic heating

Adsorbents, Working Pairs and Coated Beds for Natural Refrigerants in Adsorption Chillers—State of the Art

Study of Habitat’s Thermal Performance Equipped with an Adsorption Cooling Unit by Geothermal Heat Pump

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