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

Author(s) : SHEN B., NAWAZ K., BAXTER V., et al.

Type of article: Article, IJR article

Summary

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.

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Pages: 78-90

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Details

  • Original title: Development and validation of quasi-steady-state heat pump water heater model having stratified water tank and wrapped-tank condenser.
  • Record ID : 30023883
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 87
  • Publication date: 2018/03
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2017.10.023

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