Modeling of an ammonia–water absorption heat pump water heater for residential applications

Keinath, Christopher M.; Garimella, Srinivas; Garrabrant, Michael A.

doi:10.1016/j.ijrefrig.2017.06.007

Cited by 20 publications

(4 citation statements)

References 7 publications

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“…The selection of the refrigerant for an adsorption energy storage device is as important as the selection of the adsorbent, because the synergy between the adsorbent and uid working pairs is a critical aspect for achieving maximum performance. Working uids such as small alcohols has been proposed as alternatives to conventional refrigerants, 30,53 and water. 53,54 Water is an excellent candidate due to its high enthalpy of vaporization and zero toxicity to humans, but as a downside, water can affect MOF stability.…”

Section: Introductionmentioning

confidence: 99%

“…Working uids such as small alcohols has been proposed as alternatives to conventional refrigerants, 30,53 and water. 53,54 Water is an excellent candidate due to its high enthalpy of vaporization and zero toxicity to humans, but as a downside, water can affect MOF stability. 55 Ammonia is also an excellent working uid with a low melting point (−40 °C) and slightly lower enthalpy of vaporization than water.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Alcohol-based adsorption heat pumps using hydrophobic metal–organic frameworks

Madero-Castro,

Luna-Triguero,

González-Galán

et al. 2024

J. Mater. Chem. A

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Alcohol-based adsorption heat pumps using hydrophobic metal–organic frameworks

Madero-Castro,

Luna-Triguero,

González-Galán

et al. 2024

J. Mater. Chem. A

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“…Economic analysis has shown that operating costs can be reduced by 25% if a solar collector is added to the system. Keinath et al [10] have established a thermodynamic model for gas-fired absorption heat pump water heater. They concluded that this gas-fired absorption heat pump water heater has higher coefficients of performance compared to commercial gas-fired heaters.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Energy Consumption of a Thermo-Technical System with an Absorption Heat Pump

2024

Teh. vjesn.

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This paper discusses two different thermo-technical systems for heating and cooling the three-story office building under consideration. Data were collected on natural gas energy consumption over three-year period. The measured data on energy consumption for heating and cooling the building with an absorption heat pump using natural gas as fuel was analyzed. The only device that can replace the absorption heat pump in both the heating and cooling seasons is the vapor compression heat pump. The absorption heat pump has higher energy consumption than the vapor compression heat pump and its price is about 30% higher, but the financial cost of energy from natural gas is about 39% lower than the electricity cost of the vapor compression heat pump. The absorption heat pump is a better solution than the compression heat pump because the total financial costs, which include the investment costs and the energy costs over 20 years of operation, are about 9% lower and because the absorption heat pump heats up to an ambient temperature of -20 °C, which is not the case with the vapor compression heat pump.

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“…These data have referential importance for the selection of heating design parameters of the current building in Beijing and the optimal design of solar off-peak electricity relay heating system [9]. Keinath et al established a model for ammonia absorption heat pump heating for residential applications and introduced a direct gas single-effect ammonia absorption heat pump water heater for residential applications [10]. Jiang et al proposed a system that uses the principle of ammonia absorption heat pump to absorb heat from the solution in the absorber to absorb heat and uses ammonia water with different mass fractions as an energy carrier to achieve energy transport without heat loss at ambient temperature [11].…”

Section: Introductionmentioning

confidence: 99%

Performance Simulation and Benefit Analysis of Ammonia Absorption Cooling and Heating Dual-Supply System Based on Off-Peak Electricity Heat Storage

et al. 2019

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The energy consumption of urban central heating in northern China is two to four times that in northern Europe and other countries. Beijing has adopted measures, such as ‘coal to gas’ and ‘coal to electricity’, to reduce environmental pollution caused by central heating. Given a peak-to-valley difference in the electricity supply of power plant, which is uneven day and night, this study proposes to store the night-time off-peak electricity in the form of heat energy and drive the ammonia absorption system in the form of steam or hot water during peak or flat electricity. Simulation results of ammonia absorption cooling and heating dual-supply system show that heat source temperature increases, evaporation temperature increases, and cooling water temperature decreases are all beneficial to improve the refrigeration coefficient in the summer cooling condition. In the meantime, heat source temperature increases, evaporation temperature increases, and cooling water temperature decreases are beneficial for increasing the heating coefficient in the winter heating condition. The heating and cooling coefficients of the system are 1.38 and 0.65 in the optimal working condition in winter and summer. Benefit analysis shows that, compared with central heating and cold storage air conditioning, the system can save 576,000 tons of standard coal and 1.417 million tons of carbon dioxide if used in 12% of the cooling and heat supply areas in Beijing. The potential for energy saving and emission reduction is large.

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Modeling of an ammonia–water absorption heat pump water heater for residential applications

Cited by 20 publications

References 7 publications

Alcohol-based adsorption heat pumps using hydrophobic metal–organic frameworks

Alcohol-based adsorption heat pumps using hydrophobic metal–organic frameworks

Analysis of Energy Consumption of a Thermo-Technical System with an Absorption Heat Pump

Performance Simulation and Benefit Analysis of Ammonia Absorption Cooling and Heating Dual-Supply System Based on Off-Peak Electricity Heat Storage

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