Development and Validation of a Gas-Fired Residential Heat Pump Water Heater - Final Report

Garrabrant, Michael A.; Stout, Roger; Glanville, Paul; Fitzgerald, Janice; Keinath, Chris

doi:10.2172/1060285

Cited by 7 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The double-stage ASAHP had some advantages over the single-stage by using a low-temperature driving source, while operating in cold regions, and for delivering higher temperature of hot water. Garrabrant et al [11] tested and improved two absorption cycles, single-effect, and generator-absorber heat exchanger cycles, for residential gas-fired heat pump applications. The experimental study of the single-stage cycle was done with micro-channel and conventional heat exchangers, and a conventional heat exchanger was tested for a generator-absorber heat exchanger cycle.…”

Section: Overview Of Absorption Heat Pump Technologiesmentioning

confidence: 99%

CFD Analysis of Temperature Field in Pellet Stove as a Generator of an Absorption Heat Pump

Ilic

Stefanović

Pavlović

et al. 2020

FU Work Liv Env Prot

View full text Add to dashboard Cite

The paper presents an initial CFD study on adopting the biomass-pellet usage in a generator of an absorption heat pump by obtaining the temperature field inside the biomass furnace. Contemporary absorption technologies are mostly based on the use of gas and other waste heat as a driving force in the Generator, where the two-component working fluid splits into the refrigerant and the absorbent. There are few or no absorption heat pumps that work directly on biomass - pellets. In the Balkans, biomass - pellets are a frequent and renewable source of thermal energy. The aim of this paper is to initially research the possibility of an absorption generator to work directly on available pellets. Following this idea, a comprehensive overview of contemporary absorption technology is given with a physical and mathematical model of the small pellet stove in FLUENT, which will be modified to adapt the generator. In the beginning, temperature fields are obtained by simulation inside the furnace and on its surfaces. Work showed that the temperature field has enough potential for triggering the absorption process as temperatures in the upper part of the stove are above 400°C at the heating capacity of around 13 kW up to 20 kW. The implemented work and the obtained results could serve as a useful reference for further design and optimization of the generator of AHP for direct Biomass utilization for a middle size system.

show abstract

Section: Overview Of Absorption Heat Pump Technologiesmentioning

confidence: 99%

CFD Analysis of Temperature Field in Pellet Stove as a Generator of an Absorption Heat Pump

Ilic

Stefanović

Pavlović

et al. 2020

FU Work Liv Env Prot

View full text Add to dashboard Cite

show abstract

“…This generic representation is independent of the nature of the refrigerant, fluid flow rates, or the engine type. For the same conditions, thermal loads, and temperatures as shown in Figure 5, the required 265 minimum, actual work, and systemic Irreversibility distributed across the components is once again obtained by application of Equations (6)- (7). The results are tabulated in Table 8.…”

Section: Second Law Analysis: Generic Non-flow Configuration Of the Amentioning

confidence: 99%

“…For example, integration of absorption with micro gas turbines uses a wide range of fuels to simultaneously produce electricity, cooling, and heating (so called combined cooling, heating, 20 and power, or CCHP systems) [3, 4]. Other applications include fuel-driven Absorbtion Heat Pump (AHP) water heating [5,6,7], compression absorption heat pump for large temperature (90 o C) lifts [8, 9], solar-assisted absorption heat pumps [10,11,12, 13,14], district heating [15, 16, 13,17], and thermal energy storage [18, 19]. Many examples of industrial applications of absorption 25 heat pumps can be found in drying [20, 21, 22], distillation [23, 24, 25, 26], and evaporation [27,28].…”

mentioning

confidence: 99%

Exergy analysis of electrically- and thermally-driven engines to drive heat pumps: An exhaustive comparative study

Ally¹,

Sharma²,

Abdelaziz³

2017

International Journal of Refrigeration

View full text Add to dashboard Cite

The choice of driving a heat pump with an electrically-or a thermally-driven engine is a vexing question complicated by the carbon footprint and environmental impact of using electricity versus natural gas (or waste heat) as the main driver for the respective engines. Useful work generated by these two distinct engines is the focal point of this paper, addressing a key question: which engine presents a better choice for a given heat pumping application within the constraints of energy and environmental stewardship? We examine this question comprehensively through the methodology of energy, exergy, and availability analysis, explaining clearly, why the output of work from these two distinct engines is inherently vastly different. Thermodynamic consistency is guaranteed by satisfaction of the First and Second Laws applied to closed systems and their subsystems. The general conclusion is that thermally-driven engines are not industrious converters of heat to mechanical work, for heat pumps.ing coal. Absorption (a subset of sorption) is receiving increased attention as an enabling technology to utilize fuel more effectively, reduce pollution, and to serve multiple thermal loads simultaneously. For example, integration of absorption with micro gas turbines uses a wide range of fuels to simultaneously produce electricity, cooling, and heating (so called combined cooling, heating, 20 and power, or CCHP systems) [3, 4]. Other applications include fuel-driven Absorbtion Heat Pump (AHP) water heating [5,6,7], compression absorption heat pump for large temperature (90 o C) lifts [8, 9], solar-assisted absorption heat pumps [10,11,12, 13,14], district heating [15, 16, 13,17], and thermal energy storage [18, 19]. Many examples of industrial applications of absorption 25 heat pumps can be found in drying [20, 21, 22], distillation [23, 24, 25, 26], and evaporation [27,28]. The predominant working pairs in absorption technology are LiBr-H 2 O, NH 3 -H 2 O, and to a limited extent, NaOH-H 2 O with few exceptions [20].

show abstract

“…By using denatured alcohol in place of the ammonia, the experiments could be run under normal atmospheric conditions. Denatured alcohol has been used by other researchers (Garrabrant and Stout, 1999) to model ammonia/water absorption. systems.…”

Section: Testing Requirementsmentioning

confidence: 99%

Test facility and prototype fabrication for absorption heat pump components

Dowling¹

View full text Add to dashboard Cite

A novel absorber design for an absorption system was studied in this research project. It was taken from concept to working model through the use of experimental models. The novel geometry under consideration is constructed out of 0.0625-inch outer diameter, 0.0525inch inner diameter tubes arranged in a criss-cross pattern to enhance falling-film absorption. Simple adiabatic flow visualization models were constructed to determine the optimal tube spacing to be used in the prototype. A prototype absorber was fabricated along with a dedicated absorption heat and mass transfer test facility. This test facility simulates the desorber and absorber pair so that ammonia vapor and dilute solution can be supplied to the absorber. This test loop will be used to determine the heat and mass transfer performance of the novel absorber design.

show abstract

Development and Validation of a Gas-Fired Residential Heat Pump Water Heater - Final Report

Cited by 7 publications

References 0 publications

CFD Analysis of Temperature Field in Pellet Stove as a Generator of an Absorption Heat Pump

CFD Analysis of Temperature Field in Pellet Stove as a Generator of an Absorption Heat Pump

Exergy analysis of electrically- and thermally-driven engines to drive heat pumps: An exhaustive comparative study

Test facility and prototype fabrication for absorption heat pump components

Contact Info

Product

Resources

About