Date of Award
2013
Publisher
North Dakota State University
Document Type
Thesis
Degree Awarded
Master of Science (MS)
Program
Mechanical Engineering
Department
Mechanical Engineering
College
Engineering
Faculty Advisor
Krishnan, Sumathy
Description
Compared to the conventional solar-assisted heat pump (SAHP) water heating system, a relatively more compact direct-expansion solar assisted heat pump (DX-SAHP) has been introduced, in which the solar collector acts as an evaporator. Details of the analytical studies of a CO2 transcritical cycle on SAHP water heating system are presented in this study. A numerical model has been developed to optimize the system design and operating parameters. The simulation model can predict the performance of the system COP, collector efficiency and heat capacity. An experimental prototype using the evacuated tube U-pipe solar collector utilized to verify the simulation results. The results show that both the solar radiation and ambient temperature have a significant impact on the DX-SAHP system's thermal performance. Year round performance showed that, theoretically, the system could achieve on an average, COP of 2 - 3.2, collector efficiency of 40 - 62% and water temperature to be about 43° - 56°C.
Recommended Citation
Islam, Mohammad Raisul, "Numerical Simulation of Direct Expansion Solar-Assisted Heat Pump Water Heater Using Carbon Dioxide as Refrigerant" (2013). Mechanical Engineering and Applied Mechanics. 132.
https://digitalcommons.ndsu.edu/mech-eng-applied-mechanics/132
Rights
NDSU Policy 190.6.2
Rights Link
https://www.ndsu.edu/fileadmin/policy/190.pdf
Handle Identifier
https://hdl.handle.net/10365/27050