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Title: Development and validation of quasi-steady-state heat pump water heater model having stratified water tank and wrapped-tank condenser

Abstract

Heat pump water heater systems (HPWH) introduce new challenges for design and modeling tools, because they require vapor compression system balanced with a water storage tank. In addition, a wrapped-tank condenser coil has strong coupling with a stratified water tank, which leads HPWH simulation to a transient process. To tackle these challenges and deliver an effective, hardware-based HPWH equipment design tool, a quasi-steady-state HPWH model was developed based on the DOE/ORNL Heat Pump Design Model (HPDM). Two new component models were added via this study. One is a one-dimensional stratified water tank model, an improvement to the open-source EnergyPlus water tank model, by introducing a calibration factor to account for bulk mixing effect due to water draws, circulations, etc. The other is a wrapped-tank condenser coil model, using a segment-to-segment modeling approach. In conclusion, the HPWH system model was validated against available experimental data. After that, the model was used for parametric simulations to determine the effects of various design factors.

Authors:
 [1];  [1];  [1];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Building Technologies Research and Integration Center
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Building Technologies Office (EE-5B)
OSTI Identifier:
1423094
Grant/Contract Number:
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
International Journal of Refrigeration
Additional Journal Information:
Journal Name: International Journal of Refrigeration; Journal ID: ISSN 0140-7007
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; Heat pump water heater; Wrap-tank condenser coil; Modeling; Stratified water tank; Energy factor

Citation Formats

Shen, Bo, Nawaz, Kashif, Baxter, Van D., and Elatar, Ahmed F.. Development and validation of quasi-steady-state heat pump water heater model having stratified water tank and wrapped-tank condenser. United States: N. p., 2017. Web. doi:10.1016/j.ijrefrig.2017.10.023.
Shen, Bo, Nawaz, Kashif, Baxter, Van D., & Elatar, Ahmed F.. Development and validation of quasi-steady-state heat pump water heater model having stratified water tank and wrapped-tank condenser. United States. doi:10.1016/j.ijrefrig.2017.10.023.
Shen, Bo, Nawaz, Kashif, Baxter, Van D., and Elatar, Ahmed F.. Tue . "Development and validation of quasi-steady-state heat pump water heater model having stratified water tank and wrapped-tank condenser". United States. doi:10.1016/j.ijrefrig.2017.10.023.
@article{osti_1423094,
title = {Development and validation of quasi-steady-state heat pump water heater model having stratified water tank and wrapped-tank condenser},
author = {Shen, Bo and Nawaz, Kashif and Baxter, Van D. and Elatar, Ahmed F.},
abstractNote = {Heat pump water heater systems (HPWH) introduce new challenges for design and modeling tools, because they require vapor compression system balanced with a water storage tank. In addition, a wrapped-tank condenser coil has strong coupling with a stratified water tank, which leads HPWH simulation to a transient process. To tackle these challenges and deliver an effective, hardware-based HPWH equipment design tool, a quasi-steady-state HPWH model was developed based on the DOE/ORNL Heat Pump Design Model (HPDM). Two new component models were added via this study. One is a one-dimensional stratified water tank model, an improvement to the open-source EnergyPlus water tank model, by introducing a calibration factor to account for bulk mixing effect due to water draws, circulations, etc. The other is a wrapped-tank condenser coil model, using a segment-to-segment modeling approach. In conclusion, the HPWH system model was validated against available experimental data. After that, the model was used for parametric simulations to determine the effects of various design factors.},
doi = {10.1016/j.ijrefrig.2017.10.023},
journal = {International Journal of Refrigeration},
number = ,
volume = ,
place = {United States},
year = {Tue Oct 31 00:00:00 EDT 2017},
month = {Tue Oct 31 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on October 31, 2018
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