Energy savings for solar heating systems

Thür, Alexander; Furbo, Simon; Shah, Louise Jivan

doi:10.1016/j.solener.2006.03.007

Cited by 33 publications

(6 citation statements)

References 1 publication

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“…The latter is very popular non-expensive measure to convert oil boilers to pellet boilers by only replacing the burner. Studies have shown that the combination of conventional boiler heating systems with solar heating is beneficial in terms of fuel savings and lower emissions since the boiler usually in the summer can be turned off when it's efficiency is low (Lorenz et al, 2003, Thür et al, 2004. This has also been confirmed for a heating system based on a pellet boiler (Persson et al, 2006b).…”

Section: Introductionmentioning

confidence: 97%

Carbon monoxide emissions of combined pellet and solar heating systems

Fiedler

Persson

2009

Applied Energy

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Emissions are an important aspect of a pellet heating system. Low harmful emissions, particularly carbon monoxide, are a measure of a well performing system. High carbon monoxide emissions are often caused by unnecessary cycling of the burner when the burner is operated below the lowest combustion power. Combining pellet heaters with a solar heating systems can significantly reduce cycling of the pellet heater and avoid the inefficient summer operation of the pellet heater. Five combined systems representing the range of typical solutions of this system type and one recently developed system have been studied, modelled and simulated. These systems are compared to a reference system which is based on a pellet boiler and is not combined with a solar heating system. The aim was to study CO-emissions of the different types of systems and to analyse the potential of CO-emission reduction when the pellet heater is combined with a solar heating systems. Another aim was to compare the yearly CO-emissions obtained from simulations under realistic dynamic conditions with the yearly CO-emissions calculated based on the values that are obtained by the standard test methods. The study was performed with the simulation tool TRNSYS. The parameter used in the study have been identified from lab measurements on existing pellet boilers/stoves and solar heating systems. The results from the simulations show that is possible to almost halve the CO-emission if the pellet heater is combined with a solar heating system. The results also show that the CO-emission of existing combined solar and pellet heating systems can be drastically reduced if the pellet heater is properly controlled and some basic design rules are observed. This can also be seen when analyzing the results for the new system concept where these rules have been taken into account. Comparing the yearly CO-emissions obtained from the simulations with the yearly CO-emissions calculated based on the standard test methods shows that using the latter give too low CO-values for the whole year. It is also shown that for the existing systems the average emissions under these realistic annual conditions were greater than the limit values of two Eco-labels.

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Section: Introductionmentioning

confidence: 97%

Carbon monoxide emissions of combined pellet and solar heating systems

Fiedler

Persson

2009

Applied Energy

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“…The Stirling engine uses natural gas with the lower heating value of 35500 kJ/Nm 3 and the heating boiler uses wood pellets with the lower heating value of 18000 kJ/kg. There are many works on the calculation of energy saving by using solar energy in heating and cooling systems [15], [16] and [17]. In this paper the percentages of energy saving by using solar collectors and photovoltaic panels are expressed as follows:…”

Section: Energy Saving and Greenhouse Gas Emission Assessmentmentioning

confidence: 99%

Energy Saving and GHG Emission Reduction in a Micro-CCHP System by Use of Solar Energy

Ion¹,

Ciocea²,

Popescu³

2012

Scientific Journal of Riga Technical University. Environmental and Climate Technologies

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In this work, the reduction of greenhouse gas emission, and the energy saving by integrating solar collectors and photovoltaic panels in a Stirling engine based microcombined cooling, heating and power (mCCHP) system are studied. The mCCHP system consists of a natural gas Stirling CHP and an adsorber chiller. When the thermal outputs of the Stirling CHP and solar collectors are not sufficient to cover the heat demand for domestic hot water (DHW), heating/cooling, an auxiliary heating boiler starts to operate. The energy saving by using solar energy varies from 13.35% in December to 59.62% in April, in the case of solar collectors usage and from 7.47% in December to 28.27% in July, in the case of photovoltaic panels usage. By using solar energy the annual GHG emission decreases by 31.98% and the fuel cost reduction varies from 12.73% in December to 49.78% in June.

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“…Ecuador. The flat collectors are supposed to cover 80% of the heating demand, working at 40% efficiency (Thür et al 2006). In our design, only the anaerobic compartment is heated and it was estimated that 5 hrs of daily light peak are required.…”

Section: Economic Evaluation Of Gcc Reactormentioning

confidence: 99%

Technical and economic feasibility of gradual concentric chambers reactor for sewage treatment in developing countries

Mendoza

Carballa

Sitorus

et al. 2009

Electron. J. Biotechnol.

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A major challenge in developing countries concerning domestic wastewaters is to decrease their treatment costs. In the present study, a new cost-effective reactor called gradual concentric chambers (GCC) was designed and evaluated at lab-scale. The effluent quality of the GCC reactor was compared with that of an upflow anaerobic sludge bed (UASB) reactor. Both reactors showed organic matter removal efficiencies of 90%; however, the elimination of nitrogen was higher in the GCC reactor. The amount of biogas recovered in the GCC and the UASB systems was 50% and 75% of the theoretical amount expected, respectively, and both reactors showed a slightly higher methane production when the feed was supplemented with an additive based on vitamins and minerals. Overall, the economical analysis, the simplicity of design and the performance results revealed that the GCC technology can be of particular interest for sewage treatment in developing countries

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Energy savings for solar heating systems

Cited by 33 publications

References 1 publication

Carbon monoxide emissions of combined pellet and solar heating systems

Carbon monoxide emissions of combined pellet and solar heating systems

Energy Saving and GHG Emission Reduction in a Micro-CCHP System by Use of Solar Energy

Technical and economic feasibility of gradual concentric chambers reactor for sewage treatment in developing countries

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