Optimisation of a solar combisystem including a thermochemical storage - Focus on TRNSYS Tips and Tricks

The aim of this presentation was to present the way to simulate a solar combisystem inclueding a thermochemiacl storage. The presentation describes mainly some tips and triks used in the TRNSYS simulation. It also analyses the influence of pipes and tank insulation on the global results. First results of a small parametric analysis are provided.Sotherco: Solar Thermochemical Compact Storage Syste

Experimentation and Simulation of a Small-Scale Adsorption Cooling System in Temperate Climate

peer reviewedThis paper focuses on the analysis of the operation of a solar cooling system based upon an adsorption chiller. The air-conditioned building studied is a laboratory located in a temperate climate region (Belgium). The monitoring reveals thermal and electrical coefficient of performance (COP) of the cooling system for different time scale (10s to 1 month). The whole system including solar collectors, adsorption machine, recooling unit and hot storage is simulated. The models are then confronted to the measurements. Measurement period is shared between 2011 and 2012. Enhancements have been achieved during winter 2011 to have a more efficient system operation. The aim of this experimental work is to describe, for both measurement periods, the influence of operating conditions on the energy efficiency (thermal behavior and electrical consumption). On the simulation point of view, the main objective is to find accurate models for all the components. The adsorption chiller model is not yet precise enough to evaluate the performance of solar cooling in other conditions

Dinamičke simulacije solarnih kombi-sustava sa sezonskim sorpcijskim spremnikom topline: Utjecaj konfiguracije kombi-sustava.

This paper focuses on the sizing of solar combisystems with adsorption seasonal storage to target autonomous solar space heating. Two main configurations of the combisystem are simulated, including one or two tanks. The influence of the seasonal storage on the sizing of the tanks is also discussed. The analysis is conducted in simulation using the TRNSYS program. Results show that performances of the system with two tanks are better (2 to 4 % with seasonal storage) but some improvements should be possible for the single tank configuration. The sizing of the sensible storage is nearly independent of the solar collector area if there is a seasonal storage. The sensible storage size increases with the collectors’ area without adsorption storage.Ovaj članak je fokusiran na dimenzioniranje solarnog kombi-sustava sa sezonskim adsorpcijskim spremnikom topline sa ciljem autonomnog solarnog grijanja prostora. Dvije konfiguracije kombi-sustava su simulirane, uključujući jedan ili dva toplinska spremnika. Utjecaj sezonskog skladištenja energije na dimenzioniranje spremnika je također diskutirano. Analiza je vršena simulacijom u programu TRNSYS. Rezultati analize pokazuju da je performansa sustava sa dva spremnika bolja (2 do 4% sa sezonskim skladištenjem), ali i neka poboljšanja su moguća za konfiguraciju sa jednim toplinski spremnikom. Dimenzioniranje spremnika osjetne topline je gotovo neovisno od površine solarnih kolektora ako postoji sezonski spremnik. U slučaju bez adsorpcijskog spremnika, veličina spremnika osjetne topline se povećava sa povećanjem površine kolektora

Pré-dimensionnement par simulations dynamiques d’un réacteur de stockage thermochimique assurant l’autonomie d’un système solaire combiné.

peer reviewedEtude du stockage de l’énergie solaire thermique sous forme thermochimique comme moyen d’assurer l’autonomie thermique d’une habitation basse énergie. La surface de capteurs nécessaire et les caractéristiques du stockage sont étudiées par simulation dynamique (TRNSYS), de manière générale et pour des couples adsorbant/adsorbat particuliers (CaCl2/H2O et Charbon actif/Méthanol). Un système solaire combiné avec 14,4 m² de capteurs plans et un stockage thermochimique de 12,35 m³ de CaCl2 permet d’assurer l’autonomie thermique d’une habitation « basse énergie » située en Belgique et une grande part de la production d’eau chaude sanitaire (ECS).SOLAUTAR

Final report - Task force "Systems" - Solautark

L’objectif du projet Solautark est le développement d’un système de chauffage solaire autonome pour l’habitat. Dans cette optique, un réacteur de stockage thermochimique (TC) inter-saisonnier est étudié afin de satisfaire l’entièreté des besoins en chauffage et eau chaude sanitaire d’une ou plusieurs habitations. Dans ce cadre, le groupe de travail « Systèmes » a été créé pour étudier le fonctionnement global du système solaire. Ce système comprend : les capteurs solaires, la boucle de circulation solaire, le stockage (ballons d’eau chaude et réacteur TC), le bâtiment (y compris le système de distribution et d’émission de chaleur) et les éléments de régulation.Solautark - Etude et développement d’un système « solaire thermique autarcique » pour l’habitat individuel ou multipl

Thermal comfort and air quality: one-year measurement, analysis and feed back to users of an educational building

peer reviewedWhereas thermal comfort and air quality in buildings are often measured locally and over a short-term period, the complaints of user may occur everywhere in the building regardless the time of the day or the season. The dynamic nature of indoor environments make it hard to closely assess and compare the comfort conditions in the day-to-day life within all the spaces of a building over time. In this study, thermal comfort and air quality have been measured in four teaching rooms in a university building located in Belgium. The analysis gives a letter (A-B-C or D) for the comfort and the air quality for each room. The computed level of thermal comfort and air-quality is shown to users on a yearly and monthly basis via the TV screen located in the building. The vulgarisation, or sharing of the results with the building occupants makes the users aware of their own impact on comfort conditions and the options available for them to improve them through their own actions. The whole year gathered data illustrates the various occupancy patterns and highlights the opportunities to improve comfort:. On the one hand, the results shown a low air quality, the CO2 thresholds have been modified. On the other hand, the summer comfort, was found to be poor in two rooms. This argues with the landlord to do something to improve the comfort especially in these rooms

Experimentation and modelling of a small-scale adsorption cooling system in temperatre climate

peer reviewedThis paper describes the results of monitoring campaigns of a solar driven adsorption air-conditioning system. The energy performance figures of the system are computed and the adsorption chiller is modelled also based on measurement. This renewable energy system is able to reach, on a monthly cooling period, 40% energy savings compared to a classical air-conditioning system. Besides, the model built to handle the adsorption thermal behaviour shows performance slightly lower than the manufacturer’s performance map

Dynamic simulation of residential buildings with seasonal sorption storage of solar energy - parametric analysis

This work focuses on the evaluation of the performances of a solar combisystem coupled to seasonal thermochemical storage using SrBr2/H20 as adsorbent/adsorbate couple. The objective is to determine the characteristics required for solar system and storage reactor to reach a 100 % solar fraction for a building with a low heating load. The complete system, including the storage reactor, is simulated, using the dynamic simulation software TRNSYS. The influence of some components and parameters of the system is estimated: weather, collectors and storage reactor parameters.SOLAUTAR

Dynamic simulations of solar combisystems integrating a seasonal sorption storage: Influence of the combisystem configuration

peer reviewedThis paper focuses on the sizing of solar combisystems with adsorption seasonal storage to target autonomous solar space heating. Two main configurations of the combisystem are simulated, including one or two tanks. The influence of the seasonal storage on the sizing of the tanks is also discussed. Results show that performances of the system with two tanks are better (2 to 4 % with seasonal storage) but some improvements should be possible for the single tank configuration. The sizing of the sensible storage is nearly independent of the solar collectors area if there is a seasonal storage. The sensible storage size increase with the collectors area without adsorption storage. The analysis is conducted in simulation using the TRNSYS program.SOLAUTAR

Simulation of a vertical ground heat exchanger as low temperature heat source for a closed adsorption seasonal storage of solar heat

Get It @ ULg(opens in a new window)|View at Publisher| Export | Download | More... Energy Procedia Volume 48, 2014, Pages 370-379 2nd International Conference on Solar Heating and Cooling for Buildings and Industry, SHC 2013; Freiburg; Germany; 23 September 2013 through 25 September 2013; Code 104547 Simulation of a vertical ground heat exchanger as low temperature heat source for a closed adsorption seasonal storage of solar heat (Conference Paper) Hennaut, S.a , Thomas, S.a, Davin, E.a, Skrylnyk, A.b, Frère, M.b, André, P.a a University of Liège, Building Energy Monitoring and Simulation, Avenue de Longwy 185, 6700 Arlon, Belgium b University of Mons, Energy Research Cente, Boulevard Dolez 31, 7000 Mons, Belgium View references (9) Abstract This paper deals with the simulation of a vertical geothermal heat exchanger as low temperature heat source for a closed adsorption seasonal heat storage. The seasonal storage should allow reaching a nearly 100 % solar fraction for space heating of a "low energy" building". The selected adsorbent and adsorbate are respectively bromide strontium and water. The studied system, including the building and the ground exchanger, is simulated using the dynamic simulation software TRNSYS. Results show that expected performances are reached with a borehole of 100 m. The evaporation temperatures computed are really close to 0°C which might cause some problems. But an advanced research would maybe impose a deeper borehole to avoid cooling the ground on the long term.SOLAUTAR