Modelling and experimental analysis of a GAX NH 3 –H 2 O gas-driven absorption heat pump

Aprile, Marcello; Scoccia, Rossano; Toppi, Tommaso; Guerra, Marco; Motta, Mario

doi:10.1016/j.ijrefrig.2016.02.008

“…The need for proper monitoring systems is recommended in several experimentation studies as a core component in running a cost effective and energy saving system (Fumagalli et al, 2016;Ciganda et al, 2015). It should also be noted that studies have found that taking a more active role in the control of solution mass flow within the system and having the capability to adjust and monitor systems that are more typically inaccessible, can improve part load performance (Aprile et al, 2016). However, the extent of this control and its cost effectiveness must be analyzed.…”

Section: System Optimization and Controlmentioning

confidence: 99%

Energy modelling and field testing of natural gas absorption heat pump system in cold climate - Canada

Ethirveerasingham¹

2021

Preprint

1

0

View full text Add to dashboard Cite

The feasibility of a Natural Gas Absorption Heat Pump (GAHP) was investigated through the use of a technology screening tool developed in Excel and TRNSYS simulations that used experimentally evaluated performance curves using 50% propylene glycol (PG)/water solution. The Excel tool was used for cost and greenhouse gas (GHG) reductions analysis and indicated that the GAHP was cost effective compared to an Air-Source Heat Pump (ASHP) in locations where the primary heating fuel was natural gas and had significantly lower GHG emissions compared to a 90% efficient natural gas furnace. During the heating season, it was found that the system only had more than 100% heating Gas Utilization Efficiency (GUE) at -1.5°C or above and would go as low at 66% GUE at nominal flow and return temperatures. Part load performance was analyzed using experimental data and implemented in a TRNSYS model. The TRNSYS model shows significant losses from part load performance and 50% PG/water derating for both heating and cooling season due to excessive cycling.

show abstract

“…In Figure 2.2, the coolant water can be seen to flow through both the absorber and condenser units to gain useful thermal energy, which can be used for either DHW or radiant space heating (Wu et al, 2012b). There have been many developments in designing a more efficient system with the addition of such technologies as a generator-absorber heat exchanger (GAX), low pressure boosters (between evaporator and absorber) and high pressure boosters (between generator and condenser) which are employed in order to increase the capacity of heat able to be retained by the refrigerant but also to maximize the amount of useful energy collected from the cycle (Wu et al, 2014b;Aprile et al, 2016).…”

Section: Absorption Heat Pumpsmentioning

confidence: 99%

Energy modelling and field testing of natural gas absorption heat pump system in cold climate - Canada

Ethirveerasingham¹

2021

Preprint

2

0

View full text Add to dashboard Cite

The feasibility of a Natural Gas Absorption Heat Pump (GAHP) was investigated through the use of a technology screening tool developed in Excel and TRNSYS simulations that used experimentally evaluated performance curves using 50% propylene glycol (PG)/water solution. The Excel tool was used for cost and greenhouse gas (GHG) reductions analysis and indicated that the GAHP was cost effective compared to an Air-Source Heat Pump (ASHP) in locations where the primary heating fuel was natural gas and had significantly lower GHG emissions compared to a 90% efficient natural gas furnace. During the heating season, it was found that the system only had more than 100% heating Gas Utilization Efficiency (GUE) at -1.5°C or above and would go as low at 66% GUE at nominal flow and return temperatures. Part load performance was analyzed using experimental data and implemented in a TRNSYS model. The TRNSYS model shows significant losses from part load performance and 50% PG/water derating for both heating and cooling season due to excessive cycling.

show abstract

“…in Ref. [34]. The generator of the unit has been converted from gas fired to heat driven by means of a spiral baffled jacketed heat exchanger mounted around the bottom section of the generator, in order to promote heat transfer in counter flow configuration be-tween the driving heat transfer fluid (diathermic oil) and the ammonia-water mixture.…”

Section: Absorption Refrigeratormentioning

confidence: 99%

Study of sorption systems for application on low-emission fishing vessels

Palomba

¹

,

Aprile

²

,

Motta

³

et al. 2017

Energy

Self Cite

View full text Add to dashboard Cite

Waste-heat driven refrigeration technology represents a promising alternative for food preservation on-board, that could help reducing pollutant emissions and, at the same time, limiting fuel consumption. Aim of the present work is the assessment of possible benefits arising from the use of thermally driven systems, with focus on two technologies: absorption and adsorption. A dynamic simulation of the whole waste heat recovery system and the sorption refrigerators has been performed. For the modelling of the thermally driven chillers, experimental data from two prototypes have been employed. The results show that, for a cooling load typical of the Italian fishing fleet, fuel savings up to 1600 kg/y can be achieved, corresponding to 3 ton/ y of avoided CO 2 emissions. Moreover, for bigger vessels with 10 kW cooling load needed, up to 7 times higher fuel savings can be obtained.

show abstract

Modelling and experimental analysis of a GAX NH 3 –H 2 O gas-driven absorption heat pump

Cited by 33 publications

References 11 publications

Energy modelling and field testing of natural gas absorption heat pump system in cold climate - Canada

Energy modelling and field testing of natural gas absorption heat pump system in cold climate - Canada

Energy modelling and field testing of natural gas absorption heat pump system in cold climate - Canada

Study of sorption systems for application on low-emission fishing vessels

Contact Info

Product

Resources

About