Transcritical carbon dioxide microchannel heat pump water heaters: Part II-system simulation and optimization

Christopher Goodman; Brian M. Fronk; Srinivas Garimella

doi:10.1016/j.ijrefrig.2010.12.001

Transcritical carbon dioxide microchannel heat pump water heaters: Part II-system simulation and optimization

Christopher Goodman
, Brian M. Fronk
, Srinivas Garimella

Mechanical Engineering

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

13 Scopus citations

Abstract

This paper presents the development of a transcritical CO₂ heat pump water heating system model incorporating analytical heat exchanger models and an empirical compressor model. This study investigated the effects of a suction line heat exchanger (SLHX) and once-through versus recirculating water heating schemes. The once-through systems outperformed the recirculating systems by 10% for the system without an SLHX and 15% with an SLHX. However, a gas cooler twice as large is required. The SLHX was shown to benefit system performance at higher evaporator temperatures with improvements of 16.5% for the once-through and 4% for the recirculating systems. This study can be used to improve the design of microchannel based transcritical CO₂ heat pumps; evaluate the impact of varying water inlet temperature, desired outlet temperature and evaporation temperature on system performance; and quantify the effect of differential diurnal electricity rates on system operating costs for these different operation schemes.

Original language	English (US)
Pages (from-to)	870-880
Number of pages	11
Journal	International Journal of Refrigeration
Volume	34
Issue number	4
DOIs	https://doi.org/10.1016/j.ijrefrig.2010.12.001
State	Published - Jun 2011

All Science Journal Classification (ASJC) codes

Building and Construction
Mechanical Engineering

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10.1016/j.ijrefrig.2010.12.001

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@article{57074f6c7a964ff2b1803798c9aa8c6c,

title = "Transcritical carbon dioxide microchannel heat pump water heaters: Part II-system simulation and optimization",

abstract = "This paper presents the development of a transcritical CO2 heat pump water heating system model incorporating analytical heat exchanger models and an empirical compressor model. This study investigated the effects of a suction line heat exchanger (SLHX) and once-through versus recirculating water heating schemes. The once-through systems outperformed the recirculating systems by 10\% for the system without an SLHX and 15\% with an SLHX. However, a gas cooler twice as large is required. The SLHX was shown to benefit system performance at higher evaporator temperatures with improvements of 16.5\% for the once-through and 4\% for the recirculating systems. This study can be used to improve the design of microchannel based transcritical CO2 heat pumps; evaluate the impact of varying water inlet temperature, desired outlet temperature and evaporation temperature on system performance; and quantify the effect of differential diurnal electricity rates on system operating costs for these different operation schemes.",

author = "Christopher Goodman and Fronk, \{Brian M.\} and Srinivas Garimella",

note = "Funding Information: Financial support from the US Army Ft. BelVoir office through a subcontract from Modine Manufacturing Company is gratefully acknowledged. The authors also thank Modine Manufacturing Company for supplying several of the test heat exchangers and associated components. Assistance from, and insightful discussions with Mr. John Manzione, Dr. Stephen B. Memory, Mr. David Garski, Mr. Sam Collier, and Mr. Mark Hoehne for conducting this research are also acknowledged.",

year = "2011",

month = jun,

doi = "10.1016/j.ijrefrig.2010.12.001",

language = "English (US)",

volume = "34",

pages = "870--880",

journal = "International Journal of Refrigeration",

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AU - Goodman, Christopher

AU - Fronk, Brian M.

AU - Garimella, Srinivas

N1 - Funding Information: Financial support from the US Army Ft. BelVoir office through a subcontract from Modine Manufacturing Company is gratefully acknowledged. The authors also thank Modine Manufacturing Company for supplying several of the test heat exchangers and associated components. Assistance from, and insightful discussions with Mr. John Manzione, Dr. Stephen B. Memory, Mr. David Garski, Mr. Sam Collier, and Mr. Mark Hoehne for conducting this research are also acknowledged.

PY - 2011/6

Y1 - 2011/6

N2 - This paper presents the development of a transcritical CO2 heat pump water heating system model incorporating analytical heat exchanger models and an empirical compressor model. This study investigated the effects of a suction line heat exchanger (SLHX) and once-through versus recirculating water heating schemes. The once-through systems outperformed the recirculating systems by 10% for the system without an SLHX and 15% with an SLHX. However, a gas cooler twice as large is required. The SLHX was shown to benefit system performance at higher evaporator temperatures with improvements of 16.5% for the once-through and 4% for the recirculating systems. This study can be used to improve the design of microchannel based transcritical CO2 heat pumps; evaluate the impact of varying water inlet temperature, desired outlet temperature and evaporation temperature on system performance; and quantify the effect of differential diurnal electricity rates on system operating costs for these different operation schemes.

AB - This paper presents the development of a transcritical CO2 heat pump water heating system model incorporating analytical heat exchanger models and an empirical compressor model. This study investigated the effects of a suction line heat exchanger (SLHX) and once-through versus recirculating water heating schemes. The once-through systems outperformed the recirculating systems by 10% for the system without an SLHX and 15% with an SLHX. However, a gas cooler twice as large is required. The SLHX was shown to benefit system performance at higher evaporator temperatures with improvements of 16.5% for the once-through and 4% for the recirculating systems. This study can be used to improve the design of microchannel based transcritical CO2 heat pumps; evaluate the impact of varying water inlet temperature, desired outlet temperature and evaporation temperature on system performance; and quantify the effect of differential diurnal electricity rates on system operating costs for these different operation schemes.

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JO - International Journal of Refrigeration

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IS - 4

ER -

Transcritical carbon dioxide microchannel heat pump water heaters: Part II-system simulation and optimization

Abstract

All Science Journal Classification (ASJC) codes

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