Share

Modeling and simulation of air-source CO2 heat pump water heater.

Number: 2270

Author(s) : GAO Z., RICE K., NAWAZ K.

Summary

Carbon dioxide (CO2) has been widely used as working fluid for the vapor-compression refrigeration systems in large marine device. Due to the potential energy efficiency and the favorable environmental properties of CO2 as a working fluid, CO2 heat pump water heater (HPWH) systems are regarded a promising technology for centralized domestic hot water (DHW) heating in residential and commercial buildings. However, it is still at the early stage of appropriately optimizing and improving the energy performance of CO2 HPWH. This requires CO2 HPWH simulation tools capable of capturing the accurate impact of the emerging compressor, throttle device, and heat exchanger technology on CO2 heat transfer and energy efficiency. In this study, high efficiency components (compressors, pumps, fans, heat exchangers) were identified and applied to the state-of-art CO2 HPWH designs and analyzed their performance by using numerical simulation. This was done by simulating the performance of CO2 HPWH using ACMODEL design model combined with the component models developed at Oak Ridge National Laboratory (ORNL) for orifice tube, map-based compressor, and tube-in-tube gas cooler. The simulated CO2 HPWH performance was then compared with the heat pump water heater using conventional refrigerants. The results reflected that the current CO2 HPWH component and system technology achieved a lower uniform energy factor in the application of U.S. residential hot water supply not exceeding 140°F. It is vital for CO2 HPWHs to continuously improve compressor and system efficiency via novel component design.

Available documents

Format PDF

Pages: 10 p.

Available

Free

Download

Details

  • Original title: Modeling and simulation of air-source CO2 heat pump water heater.
  • Record ID : 30030637
  • Languages: English
  • Subject: Technology
  • Source: 2022 Purdue Conferences. 19th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2022

Links


See other articles from the proceedings (224)
See the conference proceedings

Indexing