Performance Indexes of an Air-Water Heat Pump Versus the Capacity Ratio: Analysis by Means of Experimental Data
The spread of near-Zero Energy Buildings (nZEB) involves the employment of high performant air-conditioning plants where renewable sources can be integrated easily. In this context, heat pumps appear as a promising solution given their ability to exploit aerothermal, hydrothermal and geothermal sour...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-07-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/13/13/3391 |
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| author | Roberto Bruno Francesco Nicoletti Giorgio Cuconati Stefania Perrella Daniela Cirone |
| author_facet | Roberto Bruno Francesco Nicoletti Giorgio Cuconati Stefania Perrella Daniela Cirone |
| author_sort | Roberto Bruno |
| collection | DOAJ |
| description | The spread of near-Zero Energy Buildings (nZEB) involves the employment of high performant air-conditioning plants where renewable sources can be integrated easily. In this context, heat pumps appear as a promising solution given their ability to exploit aerothermal, hydrothermal and geothermal sources and to supply both heating and cooling loads with the same device. In order to evaluate the energy performances in transient conditions, the actual winter (<i>COP</i>) and summer (<i>EER</i>) performance indexes, in the function of the sources’ temperatures and the capacity ratio (<i>CR</i>), have to be available. Nevertheless, heat pump manufactures often provide the trend of the performance indexes in the function of the temperatures of the sources specifically for nominal conditions, whereas the dependence of the performance indexes in the function of <i>CR</i>, that takes into account the part-load operation, is almost always not provided. Alternatively, specific technical standards suggest the use of a correction factor to modify nominal <i>COP</i> and <i>EER</i> for the attainment of the real performance indexes. In this paper, by using data from an experimental set-up equipped with air-water heat pumps, these correlations were tested and tuned. Winter results showed that correction factors suggested by standards have to be modified in the presence of a storage system. In summer, instead, a new correlation was developed to find a function between nominal and actual <i>EER</i>s in the function of <i>CR</i> by exploiting a similar approach employed for the <i>COP</i> calculation. |
| first_indexed | 2024-03-10T18:45:04Z |
| format | Article |
| id | doaj.art-fa436b3b17a64ca8a96fee1db04ca6e2 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-10T18:45:04Z |
| publishDate | 2020-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-fa436b3b17a64ca8a96fee1db04ca6e22023-11-20T05:35:22ZengMDPI AGEnergies1996-10732020-07-011313339110.3390/en13133391Performance Indexes of an Air-Water Heat Pump Versus the Capacity Ratio: Analysis by Means of Experimental DataRoberto Bruno0Francesco Nicoletti1Giorgio Cuconati2Stefania Perrella3Daniela Cirone4Department of Mechanical, Energy and Management Engineering, University of Calabria, 87036 Rende (CS), ItalyDepartment of Mechanical, Energy and Management Engineering, University of Calabria, 87036 Rende (CS), ItalyDepartment of Mechanical, Energy and Management Engineering, University of Calabria, 87036 Rende (CS), ItalyDepartment of Mechanical, Energy and Management Engineering, University of Calabria, 87036 Rende (CS), ItalyDepartment of Mechanical, Energy and Management Engineering, University of Calabria, 87036 Rende (CS), ItalyThe spread of near-Zero Energy Buildings (nZEB) involves the employment of high performant air-conditioning plants where renewable sources can be integrated easily. In this context, heat pumps appear as a promising solution given their ability to exploit aerothermal, hydrothermal and geothermal sources and to supply both heating and cooling loads with the same device. In order to evaluate the energy performances in transient conditions, the actual winter (<i>COP</i>) and summer (<i>EER</i>) performance indexes, in the function of the sources’ temperatures and the capacity ratio (<i>CR</i>), have to be available. Nevertheless, heat pump manufactures often provide the trend of the performance indexes in the function of the temperatures of the sources specifically for nominal conditions, whereas the dependence of the performance indexes in the function of <i>CR</i>, that takes into account the part-load operation, is almost always not provided. Alternatively, specific technical standards suggest the use of a correction factor to modify nominal <i>COP</i> and <i>EER</i> for the attainment of the real performance indexes. In this paper, by using data from an experimental set-up equipped with air-water heat pumps, these correlations were tested and tuned. Winter results showed that correction factors suggested by standards have to be modified in the presence of a storage system. In summer, instead, a new correlation was developed to find a function between nominal and actual <i>EER</i>s in the function of <i>CR</i> by exploiting a similar approach employed for the <i>COP</i> calculation.https://www.mdpi.com/1996-1073/13/13/3391heat pumpscapacity ratio<i>COP</i> and <i>EER</i>dynamic energy performances |
| spellingShingle | Roberto Bruno Francesco Nicoletti Giorgio Cuconati Stefania Perrella Daniela Cirone Performance Indexes of an Air-Water Heat Pump Versus the Capacity Ratio: Analysis by Means of Experimental Data Energies heat pumps capacity ratio <i>COP</i> and <i>EER</i> dynamic energy performances |
| title | Performance Indexes of an Air-Water Heat Pump Versus the Capacity Ratio: Analysis by Means of Experimental Data |
| title_full | Performance Indexes of an Air-Water Heat Pump Versus the Capacity Ratio: Analysis by Means of Experimental Data |
| title_fullStr | Performance Indexes of an Air-Water Heat Pump Versus the Capacity Ratio: Analysis by Means of Experimental Data |
| title_full_unstemmed | Performance Indexes of an Air-Water Heat Pump Versus the Capacity Ratio: Analysis by Means of Experimental Data |
| title_short | Performance Indexes of an Air-Water Heat Pump Versus the Capacity Ratio: Analysis by Means of Experimental Data |
| title_sort | performance indexes of an air water heat pump versus the capacity ratio analysis by means of experimental data |
| topic | heat pumps capacity ratio <i>COP</i> and <i>EER</i> dynamic energy performances |
| url | https://www.mdpi.com/1996-1073/13/13/3391 |
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