INVESTIGATION OF A DIRECT-EXPANSION GROUND SOURCE HEAT PUMP USING CARBON DIOXIDE

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GHAZIZADE AHSAEE HOSSEIN; AMERI MEHRAN

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Journal: Modares Mechanical Engineering Year:2017 | Volume:17 | Issue:6 Page(s): 433-443

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Information Journal Paper

Title

INVESTIGATION OF A DIRECT-EXPANSION GROUND SOURCE HEAT PUMP USING CARBON DIOXIDE

Author(s)

GHAZIZADE AHSAEE HOSSEIN | AMERI MEHRAN | Issue Writer Certificate

Keywords

GROUND SOURCE HEAT PUMPQ1

DIRECT EXPANSIONQ1

CARBON DIOXIDEQ1

TRANSCRITICALQ1

PRESSURE DROPQ2

Abstract

This paper presents a steady state simulation model to analyze a DIRECT EXPANSION GROUND SOURCE HEAT PUMP that uses CARBON DIOXIDE as refrigerant in a TRANSCRITICAL cycle. The analysis considers PRESSURE DROP characteristic in heat exchangers of the system. The present numerical model has been developed to examine the system in different operating conditions in two separate cases. These cases include constant evaporator loop length and specific heating load. Then model evaluates the system based on coefficient of performance (COP) and heating capacity in the first case and COP and evaporator loop length in the second case. To examine the performance of the system, a parametric study is performed to investigate the effect of different parameters such as difference between soil temperature and evaporator outlet temperature, compressor speed, water inlet temperature, water mass flow rate, area ratio heat exchanger and soil temperature. In both studies, it can be concluded that in a specific temperature difference of the difference between soil temperature and the outlet temperature of the evaporator, there is a maximum value for COP. Also, increasing the compressor speed and the temperature of inlet water to the gas cooler is accompanied with the reduction of COP. Increasing the mass flow rate of inlet water to the gas cooler leads to increase in COP. The results of this study include heating capacity, COP and ground heat exchanger loop length can be used for design and optimization of a DIRECT EXPANSION GROUND SOURCE HEAT PUMP.

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APA: Copy

GHAZIZADE AHSAEE, HOSSEIN, & AMERI, MEHRAN. (2017). INVESTIGATION OF A DIRECT-EXPANSION GROUND SOURCE HEAT PUMP USING CARBON DIOXIDE. MODARES MECHANICAL ENGINEERING, 17(6 ), 433-443. SID. https://sid.ir/paper/179262/en

Vancouver: Copy

GHAZIZADE AHSAEE HOSSEIN, AMERI MEHRAN. INVESTIGATION OF A DIRECT-EXPANSION GROUND SOURCE HEAT PUMP USING CARBON DIOXIDE. MODARES MECHANICAL ENGINEERING[Internet]. 2017;17(6 ):433-443. Available from: https://sid.ir/paper/179262/en

IEEE: Copy

HOSSEIN GHAZIZADE AHSAEE, and MEHRAN AMERI, “INVESTIGATION OF A DIRECT-EXPANSION GROUND SOURCE HEAT PUMP USING CARBON DIOXIDE,” MODARES MECHANICAL ENGINEERING, vol. 17, no. 6 , pp. 433–443, 2017, [Online]. Available: https://sid.ir/paper/179262/en

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