Variability of absorption heat pump efficiency for domestic water heating and space heating based on time-weighted bin analysis
Abstract
Natural gas-driven absorption heat pumps are under renewed scrutiny as a viable technology for space conditioning and water heating for residential and commercial applications because of natural gas production trends, pricing, and the speculation that it might be a “bridge fuel” in the global transition towards energy sustainability. Since any level of natural gas combustion contributes to atmospheric carbon dioxide accumulation, the merits of natural gas consuming absorption technology are re-examined in this paper from the point of view of expected efficiency throughout the United States using a time-weighted bin temperature analysis. Such analyses are necessary because equipment standards for rated performance is restricted to one set ambient condition, whereas in actual practice, the absorption heat pump (AHP) must perform over a considerably wider range of external conditions, where its efficiency may be vastly different from that at the rated condition. Quantification of variation in efficiency and system performance are imperative to address how to provide the desired utility with the least environmental impact. In this paper, we examine limiting features in absorption heat pumps and relate it to systemic performances in sixteen cities across all eight climate zones in the U.S, each containing fifteen bin temperatures. The results indicatemore »
- Authors:
-
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1410937
- Alternate Identifier(s):
- OSTI ID: 1549190
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Applied Thermal Engineering
- Additional Journal Information:
- Journal Volume: 130; Journal Issue: C; Journal ID: ISSN 1359-4311
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 42 ENGINEERING; Sorption; Heat pumps; Ammonia; Water heating; HVAC
Citation Formats
Ally, Moonis Raza, and Sharma, Vishaldeep. Variability of absorption heat pump efficiency for domestic water heating and space heating based on time-weighted bin analysis. United States: N. p., 2017.
Web. doi:10.1016/j.applthermaleng.2017.10.142.
Ally, Moonis Raza, & Sharma, Vishaldeep. Variability of absorption heat pump efficiency for domestic water heating and space heating based on time-weighted bin analysis. United States. https://doi.org/10.1016/j.applthermaleng.2017.10.142
Ally, Moonis Raza, and Sharma, Vishaldeep. Thu .
"Variability of absorption heat pump efficiency for domestic water heating and space heating based on time-weighted bin analysis". United States. https://doi.org/10.1016/j.applthermaleng.2017.10.142. https://www.osti.gov/servlets/purl/1410937.
@article{osti_1410937,
title = {Variability of absorption heat pump efficiency for domestic water heating and space heating based on time-weighted bin analysis},
author = {Ally, Moonis Raza and Sharma, Vishaldeep},
abstractNote = {Natural gas-driven absorption heat pumps are under renewed scrutiny as a viable technology for space conditioning and water heating for residential and commercial applications because of natural gas production trends, pricing, and the speculation that it might be a “bridge fuel” in the global transition towards energy sustainability. Since any level of natural gas combustion contributes to atmospheric carbon dioxide accumulation, the merits of natural gas consuming absorption technology are re-examined in this paper from the point of view of expected efficiency throughout the United States using a time-weighted bin temperature analysis. Such analyses are necessary because equipment standards for rated performance is restricted to one set ambient condition, whereas in actual practice, the absorption heat pump (AHP) must perform over a considerably wider range of external conditions, where its efficiency may be vastly different from that at the rated condition. Quantification of variation in efficiency and system performance are imperative to address how to provide the desired utility with the least environmental impact. In this paper, we examine limiting features in absorption heat pumps and relate it to systemic performances in sixteen cities across all eight climate zones in the U.S, each containing fifteen bin temperatures. The results indicate that the true expectation of performance of an AHP is significantly less than what might be optimized for the rated condition. Statistical measures of the variation in water heating COPs show that for most cities, the COP at the rated conditions is outside the 95% Confidence Interval. Moreover, it is concluded that deployment of absorption heat pump water heaters (AHPWH) may be restricted geographically by outdoor temperature constraints.},
doi = {10.1016/j.applthermaleng.2017.10.142},
journal = {Applied Thermal Engineering},
number = C,
volume = 130,
place = {United States},
year = {Thu Nov 02 00:00:00 EDT 2017},
month = {Thu Nov 02 00:00:00 EDT 2017}
}
Web of Science