Modeling the impact of integrating solar thermal systems and heat pumps for domestic hot water in electric systems – The case study of Corvo Island

2014 ◽  
Vol 72 ◽  
pp. 113-124 ◽  
Author(s):  
Diana Neves ◽  
Carlos A. Silva
Keyword(s):  
Heat Pumps ◽  
Hot Water ◽  
Solar Thermal ◽  
Thermal Systems ◽  
Domestic Hot Water ◽  
The Impact

scholarly journals Consumption and Emissions Analysis in Domestic Hot Water Hotels. Case Study: Canary Islands

2019 ◽  
Vol 11 (3) ◽  
pp. 599 ◽  
Author(s):  
Francisco Díaz Pérez ◽  
Ricardo Díaz Martín ◽  
Francisco Pérez Trujillo ◽  
Moises Díaz ◽  
Adib Mouhaffel
Keyword(s):  
High Temperature ◽  
Carbon Footprint ◽  
Canary Islands ◽  
Fossil Fuels ◽  
Heat Pumps ◽  
Hot Water ◽  
Solar Thermal ◽  
Solar Panels ◽  
Domestic Hot Water ◽  
Temperature Heat

We analyze the energy consumption of domestic hot water (DHW) in the hotels of the archipelago of the Canary Islands (Spain). Currently, systems use fossil fuels of propane and gas oil. However, this paper analyzes several alternative systems which focus on renewable and mixed energies, such as biomass, solar thermal and heat pumps systems associated with an electric generation with photovoltaic solar panels for self-consumption. The carbon footprint generated is calculated for each method of generation of DHW. In our analysis, we demonstrate that by using a high-temperature heat pump with an average coefficient of performance (COP) equal to or greater than 4.4 associated with photovoltaic solar panels, a zero-emission domestic hot water system can be achieved, when the installation area of the photovoltaic solar panels is equal to that of the solar thermal system. The importance of DHW’s carbon footprint is proven, as is the efficiency of using high-temperature heat pumps associated with photovoltaic solar panels. As such, such mixed system suggests that the generation of DHW would have zero emissions with maximum annual savings according to hotel occupancy, between 112,417 and 137,644 tons of carbon dioxide (CO2), compared to current boilers based on fossil fuels.

Comparison of two dynamic approaches to modelling solar thermal systems for domestic hot water

2018 ◽  
Vol 30 ◽  
pp. 292-303 ◽  
Author(s):  
Célia Artur ◽  
Diana Neves ◽  
Boaventura C. Cuamba ◽  
António J. Leão
Keyword(s):  
Hot Water ◽  
Solar Thermal ◽  
Thermal Systems ◽  
Domestic Hot Water

scholarly journals Analysis of solar thermal systems and future development possibilities in Lithuania

Energetika ◽  
2016 ◽  
Vol 62 (1-2) ◽  
Author(s):  
Rokas Valančius ◽  
Andrius Jurelionis ◽  
Juozas Vaičiūnas ◽  
Eugenijus Perednis ◽  
Vykintas Šuksteris
Keyword(s):  
Financial Analysis ◽  
District Heating ◽  
Simulation Software ◽  
Hot Water ◽  
Solar Thermal ◽  
Thermal Systems ◽  
Actual Performance ◽  
Domestic Hot Water ◽  
Analysis Of Alternatives ◽  
Evacuated Tube Collectors

Solar thermal systems with a total solar panel area varying from 2 to 204 m2 have been installed in Lithuania for over 20 years. The reviewed solar thermal domestic hot water systems in Lithuania produce up to 528 kWh per year per one square meter of solar collector absorber area. However, the  performance of these systems varies depending on the type of energy users, equipment and design of the  systems, as well as their maintenance. The  aim of this paper was to analyse solar thermal systems from the perspective of energy production and economic benefit as well as to outline the differences of their actual performance compared to the  numerical simulation results. A number of different solar thermal systems in Lithuania were selected for the analysis varying both in equipment used (flat type solar collectors, evacuated tube collectors) and type of energy user (domestic hot water heating, swimming pool, district heating). The  simulation software Polysun 8.1 was used for evaluation of solar thermal system performance, as well as financial analysis of alternatives of these systems. The results of the analysis showed that in the analysed cases the gap between measured and modelled data of heat energy produced by solar thermal systems was up to approximately 11%. The calculation of internal rate of return showed that a grant is required in most cases for solar thermal projects to be fully profitable.

scholarly journals Environmental and Health Impacts of Domestic Hot Water (DHW) Boilers in Urban Areas: A Case Study from Turin, NW Italy

2020 ◽  
Vol 17 (2) ◽  
pp. 595 ◽  
Author(s):  
Marco Ravina ◽  
Costanza Gamberini ◽  
Alessandro Casasso ◽  
Deborah Panepinto
Keyword(s):  
Urban Areas ◽  
Renewable Energy Sources ◽  
Heat Pumps ◽  
Hot Water ◽  
Environmental Benefits ◽  
District Heating System ◽  
Domestic Hot Water ◽  
Residential Units ◽  
Yearly Average ◽  
The Impact

Domestic hot water heat pumps (DHW HPs) have spread fast in recent years in Europe and they now represent an interesting opportunity for implementing renewable energy sources in buildings with a centralized/district heating system, where DWH is generally produced by a gas boiler or an electric water heater. Replacing these appliances has several environmental benefits, including the removal of air pollution sources and the reduction of Green House Gasses (GHG) emissions. In this work, we present the techno-economic and environmental evaluation of implementing DHW HPs in Turin, where 66% of the DHW demand is covered by dedicated gas boilers. The impact of such boilers was assessed through numerical air dispersion modeling conducted with the software SPRAY (Aria Technologies, Paris, French). Results show that removing these sources would reduce yearly average concentrations of NOx up to 1.4 µg/m3, i.e., about 1% of monitored concentrations of NOx, with a benefit of 1.05 ÷ 15.15 M€/y of avoided health externalities. Replacing boilers with DHW HPs is always financially feasible with current incentives while, in their absence, it would be convenient for residential units with 3 cohabitants or more (51.22% of the total population), thanks to scale economies.

Empirically Driven Computer Simulations of Solar Thermal Systems for Space Heating and Domestic Hot Water

2014 ◽  
Author(s):  
Curtis Robbins ◽  
Travis Goldade ◽  
S. Kent Hoekman ◽  
Roger Jacobson ◽  
Robert Turner
Keyword(s):  
Renewable Energy ◽  
Computer Simulations ◽  
Hot Water ◽  
Solar Thermal ◽  
Space Heating ◽  
Residential Setting ◽  
Hvac System ◽  
Solar Thermal Energy ◽  
Thermal Systems ◽  
Domestic Hot Water

The Desert Research Institute (DRI) has developed a Renewable Energy Deployment and Display Facility (REDD) which utilizes solar and wind to create a net zero energy residence for research, education, and outreach. The facility is a demonstration of the integration of many renewable energy technologies into a residential setting such that technology developers can show proof-of-concept, students and trade workers can get hands-on experience, and public organizations can see renewable energy components implemented into a residential setting. A major technological aspect of the facility is the use of solar thermal energy to provide space heating, Domestic Hot Water (DHW), and solar cooling. Data are monitored from three separate solar thermal systems, each with their own hot water storage, to evaluate optimized utilization of solar thermal energy into residential applications. The three solar thermal systems differ in their working fluids. System 1 uses a conventional mixture of glycol and water in 200 ft2 of ground mounted collector area, System 2 uses DHW in 210 ft2 of roof mounted collector area, and System 3 uses air in a 578 ft2 collector built into the roof. Each system is configured to be used for space heating and DHW. Systems 1 and 2 are built into the HVAC system of the 1200 ft2 house, and System 3 is built into the HVAC system of the 600 ft2 detached workshop. Data collected from each system provide the basis for year-long energy and economic simulations using TRNSYS for comparison. The results from the simulations are used to demonstrate the effectiveness of site-built solar air collectors, which have the advantage of using conventional materials, and avoid the issues of liquid collectors associated with boiling and freezing. This paper describes the experimental setup of the solar thermal systems, how the data are used as inputs to the computer simulations, and the configuration of the computer simulations. The REDD Facility, as well as the use of TRNSYS will continue to be used by DRI researchers to investigate not only the most feasible integration of components for a solar thermal residential system, but also as a tool to properly size and implement solar thermal systems.

Sign in / Sign up

Export Citation Format

Share Document