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Research Papers: Energy Systems Analysis

A Perspective Evaluation Methodology for Economic Feasibility of Low Temperature Sustainable Energy Source in Heating Mode Technology

[+] Author and Article Information
Ali H. Tarrad

Professor
Mechatronic Engineering Department
University of Southern Denmark (SDU),
Sønderborg 6400, Denmark
e-mail: dr.alitarrad@yahoo.com

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received June 17, 2017; final manuscript received August 29, 2017; published online October 4, 2017. Assoc. Editor: Luis Serra.

J. Energy Resour. Technol 140(2), 020902 (Oct 04, 2017) (10 pages) Paper No: JERT-17-1295; doi: 10.1115/1.4037900 History: Received June 17, 2017; Revised August 29, 2017

The economical and clean environment issues for a sustainable energy source at low temperature (LT) were considered and compared to natural gas technology as a fossil fuel source. The friendly environment refrigerants R410A, R407C, R717, R134a, and R600a were analyzed in an approximately 500 kW heating load output cascade heat pump. The heat pump was investigated at an intermediate temperature of 35 °C, high temperature (HT) cycle condenser at 70 °C, and compressors isentropic efficiency of 70%. All analyzed refrigerant pairs exhibited high heating season performance factor (HSPF), and it was ranged between 7 and 8.5. The thermal performance comparison revealed that the HSPF for R717/R600a showed the highest values among other refrigerant pairs. The results showed that at LT cycle evaporator temperature range of −10 to −2 °C, the natural gas technology revealed a higher season heating cost values than that of the heat pump plant by up to 10%. On the contrary at lower LT evaporator temperature, the heat pump plant technology exhibited a higher season heating cost lied in the range of 4–13.6% than that of the natural gas system. At compressors isentropic efficiency of 90%, the seasonal heating cost of the heat pump plant was lower than that of the natural gas technology by the range of 9–25% at test conditions. The mean seasonal CO2 amount released by the natural gas firing technology from all tested refrigerant pairs ranged between 2.1 and 2.5 times that of the heat pump plant technology for the investigated LT evaporator temperature range.

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Figures

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Fig. 1

A schematic diagram for a Cascade system

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Fig. 2

A schematic ph diagram for the analyzed Cascade heat pump system

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Fig. 3

Plant and heat pump power consumption comparison of different systems

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Fig. 4

Heat pump heating load comparison of different systems

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Fig. 5

Plant heating COP comparison of the various investigated systems

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Fig. 6

Plant HSPF comparison of the various studied systems

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Fig. 7

Season heating cost comparison between heat pump plant and natural gas technologies

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Fig. 8

Season heating load generation cost comparison between R717/R600a Cascade heat pump plant and natural gas firing technology

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Fig. 9

A comparison for the unit price of energy generation between both technologies

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Fig. 10

Season heating cost comparison for different energy generation technologies at compressor isentropic efficiency of (90%)

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Fig. 11

A comparison of energy generation unit price for different technologies at compressor isentropic efficiency of (90%)

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Fig. 12

A comparison for season Carbon dioxide emission from natural gas firing and heat pump plant technologies: (a) with LT evaporator temperature and (b) with heat pump plant output heating load

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Fig. 13

(a) Season heating cost dialogue for compressors isentropic efficiency of (70%) and (b) season heating cost dialogue for compressors isentropic efficiency of (90%)

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