Desiccant HVAC system driven by a micro-CHP: Experimental analysis

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

doi:10.1016/j.enbuild.2010.06.011

Cited by 63 publications

(27 citation statements)

References 12 publications

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“…In a previous paper, the influence of the regeneration temperature on the selected DW performance has been analyzed, [18]. It has been shown that the dehumidification capability of the wheel, ∆ω, increases when regeneration temperature rises: with T o = 30.5 °C and ω o = 10.7 g/kg, ∆ω varies from 1.0 g/kg to 5.6 g/kg when regeneration temperature increases from 34 to 72 °C.…”

Section: Comparison Between As and Csmentioning

confidence: 99%

Experimental investigation to optimise a desiccant HVAC system coupled to a small size cogenerator

Angrisani

Minichiello

Roselli

et al. 2011

Applied Thermal Engineering

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. Experimental investigation to optimise a desiccant HVAC system coupled to a small size cogenerator. Applied Thermal Engineering, Elsevier, 2010, 31 (4) This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. ABSTRACTIn the Mediterranean area, the increasing demand of summer cooling in residential and tertiary sectors is usually satisfied by electrically-driven units; this often determines electric load peaks and black-outs.Thus, a wide interest is spreading in small scale natural gas-fired polygeneration systems: a prime mover drives (mechanically, electrically, thermally) electric generators and/or heat pumps, desiccant wheels, etc., matching thermal (heating and cooling) and electric end-user requirements.In this paper, laboratory tests have been considered to experimentally evaluate a small scale polygeneration system based on a natural gas-fired Micro-CHP and a desiccant-based HVAC system. Cogenerated thermal power is used for the desiccant wheel regeneration, while electric power for auxiliaries, chiller and external units. The HVAC system can also interact with electric and thermal separate "production" systems. The main results of the experimental tests are shown, stating the increase of the COP of the chiller in desiccant-based HVAC systems. Then the paper identifies the operating conditions (outdoor and supply air thermal-hygrometric conditions, electric grid efficiency and partial load operation of the MCHP) which guarantee significant primary energy savings (up to around 30 %) and CO 2 equivalent emission reductions (up to around 40 %) of the polygeneration system compared to the conventional HVAC system. 2

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Section: Comparison Between As and Csmentioning

confidence: 99%

Experimental investigation to optimise a desiccant HVAC system coupled to a small size cogenerator

Angrisani

Minichiello

Roselli

et al. 2011

Applied Thermal Engineering

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“…2. The system is located at "Università degli Studi del Sannio" (in Benevento, Southern Italy) and was experimentally analysed in previous research works [7][8][9][10][11][12]. The type, measuring range and accuracy of installed sensors, as well as the legend for the symbols, are also shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

The effectiveness method to predict the behaviour of a desiccant wheel: An attempt of experimental validation

Ruivo

Angrisani

2014

Applied Thermal Engineering

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The desiccant wheel is a key component in solid-desiccant systems. At present, the analysis of the behaviour of air handling units based on desiccant wheels is a complex task. It is difficult to access a simple model that can represent the behaviour of commercialized desiccant wheels with sufficient accuracy.Experimental data measured in an air handling unit equipped with a desiccant wheel are considered in the present work. The air handling unit belongs to a test facility with a microcogeneration system located at Università degli Studi del Sannio (in Benevento, Southern Italy). Thermal energy from the microcogenerator is used to heat up the regeneration airflow. An attempt of investigating the validity of the simplified effectiveness method in predicting the global behaviour of a desiccant wheel is performed. Two approaches are used with different pair of effectiveness parameters.Only one sensor of temperature and one sensor of relative humidity were used in each measuring section of the air handling unit. This constraint is most crucial at both outlet * Corresponding author. Tel.: +351 289 800100; fax: +351 289 888405; e-mail: cruivo@ualg.pt M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT2 sections of the desiccant wheel due to the strong dependence of the air state on the angular position.An empirical correction of the measured state of the process air at the outlet of the desiccant wheel is used. The corrected data are used in the investigation of the validity of the effectiveness method by using constant values in a large set of cases where the rotation speed of the desiccant wheels and the fans are kept constant. Important deviations between the predicted and the experimental results were found in a significant number of cases, therefore there is the need of improving the method by taking into account the effect on the effectiveness parameters of varying the inlet states of both airflows.

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“…The solar subsystem with the back-up boiler regulates the water temperature from the TS in order to ensure the necessary heat adduction to the two coils, HC and HC2. The main components of the air conditioning system are previously described by Calise et al [23] and by Angrisani et al [22], and detailed information about their characteristics and design condition are reported there.…”

Section: Innovative Desiccant Air Handling Unit-based Air Conditioninmentioning

confidence: 99%

“…The DW considered in these three scenarios is the same as the existing experimental plant (Scenario A). Moreover, its rotational speed, the process and regeneration air flowrate, humidity and temperature are fixed The main components of the air conditioning system are previously described by Calise et al [23] and by Angrisani et al [22], and detailed information about their characteristics and design condition are reported there. …”

Section: Alternative System Layoutsmentioning

confidence: 99%

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Performance Assessment of a Solar-Assisted Desiccant-Based Air Handling Unit Considering Different Scenarios

et al. 2016

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Abstract:In this paper, three alternative layouts (scenarios) of an innovative solar-assisted hybrid desiccant-based air handling unit (AHU) are investigated through dynamic simulations. Performance is evaluated with respect to a reference system and compared to those of the innovative plant without modifications. For each scenario, different collector types, surfaces and tilt angles are considered. The effect of the solar thermal energy surplus exploitation for other low-temperature uses is also investigated. The first alternative scenario consists of the recovery of the heat rejected by the condenser of the chiller to pre-heat the regeneration air. The second scenario considers the pre-heating of regeneration air with the warmer regeneration air exiting the desiccant wheel (DW). The last scenario provides pre-cooling of the process air before entering the DW. Results reveal that the plants with evacuated solar collectors (SC) can ensure primary energy savings (15%-24%) and avoid equivalent CO 2 emissions (14%-22%), about 10 percentage points more than those with flat-plate collectors, when the solar thermal energy is used only for air conditioning and the collectors have the best tilt angle. If all of the solar thermal energy is considered, the best results with evacuated tube collectors are approximately 73% in terms of primary energy saving, 71% in terms of avoided equivalent CO 2 emissions and a payback period of six years.

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Desiccant HVAC system driven by a micro-CHP: Experimental analysis

Cited by 63 publications

References 12 publications

Experimental investigation to optimise a desiccant HVAC system coupled to a small size cogenerator

Experimental investigation to optimise a desiccant HVAC system coupled to a small size cogenerator

The effectiveness method to predict the behaviour of a desiccant wheel: An attempt of experimental validation

Performance Assessment of a Solar-Assisted Desiccant-Based Air Handling Unit Considering Different Scenarios

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