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Mathematical modeling and simulation application to visualize the performance of retrofit heat pump water heater under first hour heating rating

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  • Tangwe, Stephen
  • Simon, Michael
  • Meyer, Edson

Abstract

Air source heat pump unlike water and geothermal source heat pumps are widely used in sanitary hot water production by virtue of the relative ease of harvesting, low grade aero-thermal energy and less complexity in operating and maintaining the heat pump unit. This research focused on performance monitoring of 1.2 kW air source heat pump, retrofitting a 200 L high pressure storage tank and operating under first hour heating rating for seven different climatic conditions. A data acquisition system was designed and built to measure the desired predictors of the power consumption and coefficient of performance of the ASHP water heater. A robust mathematical multiple linear regression models were built and were used in the modeled blocks in the simulation application developed in Simulink of MATLAB. Results indicated that the maximum coefficient of performance was associated with the maximum power consumption of the ASHP water heater. Finally, the simulation application could also be used by ASHP manufacturers and the energy saving company to quantify the energy reduced when geysers are retrofitted by ASHP. Optimization using constrained linear least squares solver in the optimization toolbox was also used to eliminate errors in the measurement from inclusion into the mathematical models.

Suggested Citation

  • Tangwe, Stephen & Simon, Michael & Meyer, Edson, 2014. "Mathematical modeling and simulation application to visualize the performance of retrofit heat pump water heater under first hour heating rating," Renewable Energy, Elsevier, vol. 72(C), pages 203-211.
    • Handle: RePEc:eee:renene:v:72:y:2014:i:c:p:203-211
    DOI: 10.1016/j.renene.2014.07.011
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    References listed on IDEAS

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    1. Genchi, Yutaka & Kikegawa, Yukihiro & Inaba, Atsushi, 2002. "CO2 payback-time assessment of a regional-scale heating and cooling system using a ground source heat-pump in a high energy-consumption area in Tokyo," Applied Energy, Elsevier, vol. 71(3), pages 147-160, March.
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    Cited by:

    1. Valeria Palomba & Efstratios Varvagiannis & Sotirios Karellas & Andrea Frazzica, 2019. "Hybrid Adsorption-Compression Systems for Air Conditioning in Efficient Buildings: Design through Validated Dynamic Models," Energies, MDPI, vol. 12(6), pages 1-28, March.
    2. Song, Yang & Peskova, Monika & Rolando, Davide & Zucker, Gerhard & Madani, Hatef, 2023. "Estimating electric power consumption of in-situ residential heat pump systems: A data-driven approach," Applied Energy, Elsevier, vol. 352(C).
    3. Stephen Tangwe & Patrick Mukumba & Golden Makaka, 2023. "An Installed Hybrid Direct Expansion Solar Assisted Heat Pump Water Heater to Monitor and Modeled the Energy Factor of a University Students’ Accommodation," Energies, MDPI, vol. 16(3), pages 1-30, January.
    4. Christy E. Manyi-Loh & Mandlenkosi Sikhonza & Stephen Tangwe, 2021. "Linear Regression Analysis and Techno-Economic Viability of an Air Source Heat Pump Water Heater in a Residence at a University Campus," Energies, MDPI, vol. 14(8), pages 1-22, April.

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