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Title: Feasibility analysis of a Commercial HPWH with CO 2 Refrigerant

Abstract

A scoping-level analysis has conducted to establish the feasibility of using CO 2 as refrigerant for a commercial heat pump water heater (HPWH) for U.S. applications. The DOE/ORNL Heat Pump Design Model (HPDM) modeling tool was used for the assessment with data from a Japanese heat pump water heater (Sanden) using CO 2 as refrigerant for calibration. A CFD modeling tool was used to further refine the HPDM tank model. After calibration, the model was used to simulate the performance of commercial HPWHs using CO 2 and R-134a (baseline). The parametric analysis concluded that compressor discharge pressure and water temperature stratification are critical parameters for the system. For comparable performance the compressor size and water-heater size can be significantly different for R-134 and CO 2 HPWHs. The proposed design deploying a gas-cooler configuration not only exceeds the Energy Star Energy Factor criteria i.e. 2.20, but is also comparable to some of the most efficient products in the market using conventional refrigerants.

Authors:
 [1];  [1];  [1];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Building Technologies Research and Integration Center (BTRIC)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1366408
Report Number(s):
ORNL/TM-2017/127
BT0400000; CEBT002
DOE Contract Number:
AC05-00OR22725
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION

Citation Formats

Nawaz, Kashif, Shen, Bo, Elatar, Ahmed F., and Baxter, Van D.. Feasibility analysis of a Commercial HPWH with CO2 Refrigerant. United States: N. p., 2017. Web. doi:10.2172/1366408.
Nawaz, Kashif, Shen, Bo, Elatar, Ahmed F., & Baxter, Van D.. Feasibility analysis of a Commercial HPWH with CO2 Refrigerant. United States. doi:10.2172/1366408.
Nawaz, Kashif, Shen, Bo, Elatar, Ahmed F., and Baxter, Van D.. Sun . "Feasibility analysis of a Commercial HPWH with CO2 Refrigerant". United States. doi:10.2172/1366408. https://www.osti.gov/servlets/purl/1366408.
@article{osti_1366408,
title = {Feasibility analysis of a Commercial HPWH with CO2 Refrigerant},
author = {Nawaz, Kashif and Shen, Bo and Elatar, Ahmed F. and Baxter, Van D.},
abstractNote = {A scoping-level analysis has conducted to establish the feasibility of using CO2 as refrigerant for a commercial heat pump water heater (HPWH) for U.S. applications. The DOE/ORNL Heat Pump Design Model (HPDM) modeling tool was used for the assessment with data from a Japanese heat pump water heater (Sanden) using CO2 as refrigerant for calibration. A CFD modeling tool was used to further refine the HPDM tank model. After calibration, the model was used to simulate the performance of commercial HPWHs using CO2 and R-134a (baseline). The parametric analysis concluded that compressor discharge pressure and water temperature stratification are critical parameters for the system. For comparable performance the compressor size and water-heater size can be significantly different for R-134 and CO2 HPWHs. The proposed design deploying a gas-cooler configuration not only exceeds the Energy Star Energy Factor criteria i.e. 2.20, but is also comparable to some of the most efficient products in the market using conventional refrigerants.},
doi = {10.2172/1366408},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Feb 12 00:00:00 EST 2017},
month = {Sun Feb 12 00:00:00 EST 2017}
}

Technical Report:

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