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

Bo Shen; Kashif Nawaz; Van Baxter; Ahmed Elatar

doi:10.1016/j.ijrefrig.2017.10.023

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

Bo Shen, Kashif Nawaz, Van Baxter, Ahmed Elatar

Research output: Contribution to journal › Article › peer-review

24 Scopus citations

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. 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.

Original language	English
Pages (from-to)	78-90
Number of pages	13
Journal	International Journal of Refrigeration
Volume	87
DOIs	https://doi.org/10.1016/j.ijrefrig.2017.10.023
State	Published - Mar 2018

Funding

This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan ). The authors acknowledge the support provided by DOE Building Technologies Office ( DE-AC05-00OR22725 ) and the Technology Manager, Antonio Bouza.

Funders	Funder number
U.S. Department of Energy
Building Technologies Office	DE-AC05-00OR22725

Keywords

Energy factor
Heat pump water heater
Modeling
Stratified water tank
Wrap-tank condenser coil

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.ijrefrig.2017.10.023

Cite this

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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. 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.",

keywords = "Energy factor, Heat pump water heater, Modeling, Stratified water tank, Wrap-tank condenser coil",

author = "Bo Shen and Kashif Nawaz and Van Baxter and Ahmed Elatar",

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year = "2018",

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doi = "10.1016/j.ijrefrig.2017.10.023",

language = "English",

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AU - Shen, Bo

AU - Nawaz, Kashif

AU - Baxter, Van

AU - Elatar, Ahmed

PY - 2018/3

Y1 - 2018/3

N2 - 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. 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.

AB - 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. 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.

KW - Energy factor

KW - Heat pump water heater

KW - Modeling

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KW - Wrap-tank condenser coil

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

Abstract

Funding

Keywords

UN SDGs

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