Technical evaluation of a stand-alone photovoltaic heat pump system without batteries for cooling applications

Lorenzo Navarro, Celena and Narvarte Fernández, Luis and Almeida, Rita H. and Cristóbal López, Ana Belén (2020). Technical evaluation of a stand-alone photovoltaic heat pump system without batteries for cooling applications. "Solar Energy", v. 206 ; pp. 92-105. ISSN 0038-092X. https://doi.org/10.1016/j.solener.2020.05.097.

Description

Title: Technical evaluation of a stand-alone photovoltaic heat pump system without batteries for cooling applications
Author/s:
  • Lorenzo Navarro, Celena
  • Narvarte Fernández, Luis
  • Almeida, Rita H.
  • Cristóbal López, Ana Belén
Item Type: Article
Título de Revista/Publicación: Solar Energy
Date: August 2020
ISSN: 0038-092X
Volume: 206
Subjects:
Freetext Keywords: Cooling, Heat pump, Key performance indicator, Solar photovoltaic, Stand-alone
Faculty: Instituto de Energía Solar (IES) (UPM)
Department: Ingeniería Telemática y Electrónica
UPM's Research Group: Sistemas Fotovoltáicos
Creative Commons Licenses: None

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Abstract

The coupling of Photovoltaic (PV) and Heat Pump (HP) systems is an attractive alternative for reducing the energy consumption associated to cooling applications, as well as increasing the renewable share in the electric systems. This work presents the results of the technical validation of a stand-alone PV-HP system operating without batteries, for two different control algorithms implemented for the compressor of the HP unit: the Maximum Power Point Tracking control (MPPT) and the inverter control. Both algorithms include a routine for mitigating the solar power fluctuations due to passing clouds, which was able to resist 75% of the clouds registered during the carrying out of the tests. The values of the main Key Performance Indicators (KPIs) traditionally used for the characterization of PV and HP systems –Performance Ratio (PR), Energy Efficiency Ratio (EER) and Seasonal Performance factor (SPF)– were calculated, as well as some new KPIs proposed for PV-HP systems. These new KPIs are proposed to distinguish the loss of performance due to any bad quality of the PV-HP and to external factors such as user behavior or the cooling period. The results show a PR of between 0.17 and 0.5, an EER of between 2.51 and 3.06 and a SPF of between 2.51 and 3.01. The low PR value is explained by the utilization ratios of the system (UREF ranged from 0.27 to 0.77) due to the characteristics of this application, rather than any bad quality in the PV-HP system.

Funding Projects

TypeCodeAcronymLeaderTitle
Madrid Regional GovernmentP2018/EMT-4308MADRID-PV2UnspecifiedUnspecified

More information

Item ID: 62739
DC Identifier: http://oa.upm.es/62739/
OAI Identifier: oai:oa.upm.es:62739
DOI: 10.1016/j.solener.2020.05.097
Official URL: https://www.sciencedirect.com/science/article/pii/S0038092X2030596X?via%3Dihub
Deposited by: Dr. Luis Narvarte Fernández
Deposited on: 18 Jun 2020 07:24
Last Modified: 18 Jun 2020 07:24
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