Dynamic performance assessment of a micro-trigeneration system with a desiccant-based air handling unit in Southern Italy climatic conditions

Angrisani, Giovanni; Roselli, Carlo; Sasso, Maurizio; Tariello, Francesco

doi:10.1016/j.enconman.2014.01.028

Cited by 57 publications

(36 citation statements)

References 19 publications

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“…The dimensions and thermal insulation characteristics of opaque and transparent components of the simulated building envelope can be found in [11]. Furthermore, all year long, solar collectors provide thermal energy for DHW production, to a nearby user (a multifamily house).…”

Section: The Usermentioning

confidence: 99%

“…Thermal energy to regenerate the silica-gel rotor in the desiccant-based air-handling unit is provided by a natural gas boiler (measured thermal efficiency equal to 82.8% [11]), directly interacting with the HC in the regeneration path of the AHU (Figure 4), to heat up the regeneration air (1)(2)(3)(4)(5). This is then used to regenerate the DW (5-6).…”

Section: Scenario D (Natural Gas Boiler)mentioning

confidence: 99%

“…Furthermore, all year long, solar collectors provide thermal energy for DHW production, to a nearby user (a multifamily house). A tool to generate realistic DHW load profiles was used [11]. Each profile consists of a value of water flow rate for each time step.…”

Section: The Usermentioning

confidence: 99%

“…• η is the average energy performance factor of Italian reference system for electricity supply, including transmission and distribution losses (ratio of electric energy output to primary energy input), assumed equal to 42.0% [11]; • η is thermal efficiency of the boiler (equal to 82.8%, average value derived from experimental tests); • α is the specific equivalent CO2 emission factor of electricity drawn from the grid (0.573 kg/kWhel [11]); • β is the specific equivalent CO2 emission factor for primary energy related to natural gas consumption (0.207 kg/kWhp [11]); • Lower Heating Value (LHV) of natural gas equal to 9.52 kWh/Nm Furthermore, the Italian legislation recently introduced a mechanism to incentivize the use of renewable energy-based technologies to produce thermal energy [18]. In the case of solar collectors, the annual incentive can be evaluated as:…”

Section: Mathematical Models and Thermo-economic Performance Assessmentmentioning

confidence: 99%

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Assessment of Energy, Environmental and Economic Performance of a Solar Desiccant Cooling System with Different Collector Types

et al. 2014

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Desiccant-based air handling units can achieve reductions in greenhouse gas emissions and energy savings with respect to conventional air conditioning systems. Benefits are maximized when they interact with renewable energy technologies, such as solar collectors. In this work, experimental tests and data derived from scientific and technical literature are used to implement a model of a solar desiccant cooling system, considering three different collector technologies (air, flat-plate and evacuated collectors). Simulations were then performed to compare the energy, environmental and economic performance of the system with those of a desiccant-based unit where regeneration thermal energy is supplied by a natural gas boiler, and with those of a conventional air-handling unit. The only solution that allows achieving the economic feasibility of the solar desiccant cooling unit consists of 16 m 2 of evacuated solar collectors. This is able to obtain, with respect to the reference system, a reduction of primary energy consumption and of the equivalent CO2 emissions of 50.2% and 49.8%, respectively, but with a payback time of 20 years. OPEN ACCESSEnergies 2014, 7 6742

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Section: The Usermentioning

confidence: 99%

Section: Scenario D (Natural Gas Boiler)mentioning

confidence: 99%

Section: The Usermentioning

confidence: 99%

Section: Mathematical Models and Thermo-economic Performance Assessmentmentioning

confidence: 99%

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Assessment of Energy, Environmental and Economic Performance of a Solar Desiccant Cooling System with Different Collector Types

et al. 2014

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“…simple pay-back time of the additional investment was 5.47 years. There are also papers dealing with micro-trigeneration system such as Angrisani et al [10], where a trigeneration system on a small-scale is assessed. Nevertheless, Kilkis ß [11] developed a model for the net-zero exergy district development for a city in Sweden, which among other units includes a CHP plant with district heating and cooling system.…”

Section: Introductionmentioning

confidence: 99%

A hybrid optimization model of biomass trigeneration system combined with pit thermal energy storage

Dominković

Ćosić

Medić

et al. 2015

Energy Conversion and Management

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a b s t r a c tThis paper provides a solution for managing excess heat production in trigeneration and thus, increases the power plant yearly efficiency. An optimization model for combining biomass trigeneration energy system and pit thermal energy storage has been developed. Furthermore, double piping district heating and cooling network in the residential area without industry consumers was assumed, thus allowing simultaneous flow of the heating and cooling energy. As a consequence, the model is easy to adopt in different regions. Degree-hour method was used for calculation of hourly heating and cooling energy demand. The system covers all the yearly heating and cooling energy needs, while it is assumed that all the electricity can be transferred to the grid due to its renewable origin. The system was modeled in MatlabÓ on hourly basis and hybrid optimization model was used to maximize the net present value (NPV), which was the objective function of the optimization. Economic figures become favorable if the economy-of-scale of both power plant and pit thermal energy storage can be utilized. The results show that the pit thermal energy storage was an excellent option for storing energy and shaving peaks in energy demand. Finally, possible switch from feed-in tariffs to feed-in premiums was assessed and possible subsidy savings have been calculated. The savings are potentially large and can be used for supporting other renewable energy projects.

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Partitioning of MCHP-TES system run time to incorporate transient system behaviour: a comprehensive exergy-based analysis using simulation

Ummenhofer

Olsen

Roediger

2016

Int. J. Energy Res.

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SUMMARYBy combining heat and power generation, mini-combined and micro-combined heat and power systems (MCHP) provide an efficient, decentralised means of power generation that can complement the composition of the electricity generation mix. Dynamic tools capable of handling transient system behaviour are required to assess MCHP efficiency beyond a mere static analysis based on steady-state design parameters. Using a simulation of a cogeneration system, we combine exergetic definitions for different operational system states to quantify the overall system efficiency continuously over the whole period of operation. The concept of exergy allows direct comparison of different forms of energy. A sensitivity analysis was performed where we quantified the effect on MCHP overall performance under varying engine rotational speed, thermal energy storage size and fluid storage temperature in a range of MCHP simulations. We found that the exergetic quantity of natural gas used by the MCHP decreased slightly at higher engine speeds (À2% to À4%). While the total amount of electricity generated is almost constant across the range of different engine output, more thermal exergy (up to +21%) can be recovered when the engine is operating at elevated speeds. Furthermore, selection of specific optimal thermal storage fluid temperatures can aid in improving system efficiency.

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Dynamic performance assessment of a micro-trigeneration system with a desiccant-based air handling unit in Southern Italy climatic conditions

Cited by 57 publications

References 19 publications

Assessment of Energy, Environmental and Economic Performance of a Solar Desiccant Cooling System with Different Collector Types

Assessment of Energy, Environmental and Economic Performance of a Solar Desiccant Cooling System with Different Collector Types

A hybrid optimization model of biomass trigeneration system combined with pit thermal energy storage

Partitioning of MCHP-TES system run time to incorporate transient system behaviour: a comprehensive exergy-based analysis using simulation

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