Simulation and experimental investigation into diffusion absorption cooling machines for air-conditioning applications

Jakob, Uli; Eicker, Ursula; Schneider, D.; Taki, A. H.; Cook, Malcolm

doi:10.1016/j.applthermaleng.2007.08.007

Cited by 84 publications

(38 citation statements)

References 11 publications

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“…During the test period, an average COP equal to 0.52 was obtained (referred to the whole system and not only to the absorption machine), in compliance with the data from literature [39]. During the investigated period, the cooling energy out of the absorption machine 22/07/13 00:00 23/07/13 00:00 24/07/13 00:00 25/07/13 00:00 26/07/13 00:00 27/07/13 00:00…”

Section: Biomass Boiler With Absorption Machine (Biomass-absorption Msupporting

confidence: 54%

“…Therefore, the heat produced using biomass could be conveniently used for cooling using an absorption machine. The gas, kerosene or electrically driven absorption refrigerators were theoretically and experimentally investigated in the literatures [39][40][41][42][43][44], also for trigeneration applications and they are widely used both with conventional heat sources and thermal solar energy [20,21]. The innovative approach proposed here is the heat production for the absorption from different renewable resources, such as biomass.…”

Section: The Pilot Heating/cooling System Ideasmentioning

confidence: 99%

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Development of Innovative Heating and Cooling Systems Using Renewable Energy Sources for Non-Residential Buildings

et al. 2013

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Industrial and commercial areas are synonymous with high energy consumption, both for heating/cooling and electric power requirements, which are in general associated to a massive use of fossil fuels producing consequent greenhouse gas emissions. Two pilot systems, co-funded by the Italian Ministry for the Environment, have been created to upgrade the heating/cooling systems of two existing buildings on the largest industrial estate in Umbria, Italy. The upgrade was specifically designed to improve the system efficiency and to cover the overall energy which needs with renewable energy resources. In both cases a solar photovoltaic plant provides the required electric power. The first system features a geothermal heat pump with an innovative layout: a heat-storage water tank, buried just below ground level, allows a significant reduction of the geothermal unit size, hence requiring fewer and/or shorter boreholes (up to 60%-70%). In the other system a biomass boiler is coupled with an absorption chiller machine, controlling the indoor air temperature in both summer and winter. In this case, lower electricity consumption, if compared to an electric compression chiller, is obtained. The first results of the monitoring of summer cooling are presented and an evaluation of the performance of the two pilot systems is given.

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Section: Biomass Boiler With Absorption Machine (Biomass-absorption Msupporting

confidence: 54%

Section: The Pilot Heating/cooling System Ideasmentioning

confidence: 99%

Development of Innovative Heating and Cooling Systems Using Renewable Energy Sources for Non-Residential Buildings

et al. 2013

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“…The implementation of such control strategies in real systems has been proven to be feasible without any particular problems. The obtained daily overall system efficiencies with the third control strategy (AEER above 6) are satisfactory despite the relatively low thermal performance of the investigated chiller [20]. Further investigations are required in order to demonstrate the reliability of such a control approach and extend its implementation in real systems.…”

Section: Discussionmentioning

confidence: 99%

“…The central component is a diffusion ammonia/water absorption chiller as the last version of several prototypes developed at the Stuttgart University of Applied Sciences [20]. The particularity of such technology is that the chillers do not need electricity to run the refrigerant cycle internally.…”

Section: Hardware Componentsmentioning

confidence: 99%

Control Optimization of Solar Thermally Driven Chillers

et al. 2016

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Many installed solar thermally driven cooling systems suffer from high auxiliary electric energy consumption which makes them not more efficient than conventional compression cooling systems. A main reason for this is the use of non-efficient controls with constant set points that do not allow a chiller power modulation at partial-load and therefore lead to unnecessary high power consumption of the parasitics. The aims of this paper are to present a method to control efficiently solar thermally driven chillers, to demonstrate experimentally its applicability and to quantify the benefits. It has been shown that the cooling capacity of a diffusion absorption chiller can be modulated very effectively by adjusting both the temperature and the flow rate of the cooling water. With the developed approach and the use of optimization algorithms, both the temperature and the flow rate can be controlled simultaneously in a way that the cooling load is matched and the electricity consumption is minimized. Depending on the weather and operating conditions, electricity savings between 20% and 60% can be achieved compared to other tested control approaches. The highest savings are obtained when the chiller is operated at partial load. The presented method is not restricted to solar cooling systems and can also be applied to other conventional heating ventilation and air conditioning (HVAC) systems.

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“…The results showed that it had no limitation to the fluid flow rate and depended solely on the amount of heat input. Zohar et al [5] and Jakob et al [6] investigated the effects of generator and bubble pump configuration on the performance of the system for the ammonia-water DAR with hydrogen and helium as the auxiliary inert gas respectively.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigations on the pumping performance of bubble pumps with organic solutions

Han

Wang

et al. 2015

Applied Thermal Engineering

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Simulation and experimental investigation into diffusion absorption cooling machines for air-conditioning applications

Cited by 84 publications

References 11 publications

Development of Innovative Heating and Cooling Systems Using Renewable Energy Sources for Non-Residential Buildings

Development of Innovative Heating and Cooling Systems Using Renewable Energy Sources for Non-Residential Buildings

Control Optimization of Solar Thermally Driven Chillers

Experimental investigations on the pumping performance of bubble pumps with organic solutions

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