Modelling of dynamics and stratification effects in pellet boilers

Persson, Tomas; Wiertzema, Holger; Win, Kaung Myat; Bales, Chris

doi:10.1016/j.renene.2018.11.052

Cited by 6 publications

(3 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Bourke and Bansal (2012) expressed the thermal efficiency of the gas instantaneous water heater with respect to the operating conditions by an equation in order to be used in the TRNSYS model to include the efficiency variations of this water heater and to yield more accurate energy consumption calculations. Persson et al (2019) established a boiler model combining two of the existing models in TRNSYS as Type 210 and Type 341 which is a modified version of Type 340. The pellet burner was modelled using the Type 210.…”

Section: Introductionmentioning

confidence: 99%

Trnsys Model of the Combi Boiler Domestic Hot Water Circuit With a Focus on the Parameter Definition of the Plate Heat Exchanger

GÖK,

ATMACA,

EREK

et al. 2023

Isı Bilimi Ve Tekniği Dergisi

View full text Add to dashboard Cite

Combi boilers used for both space and domestic hot water heating are one of the common household appliances. Modelling the domestic hot water circuit of a combi boiler for the preliminary evaluation of the laboratory testing is of crucial importance since it decreases the time, cost, and energy spent on the trials. There are various modelling approaches established by the authors of this paper. Domestic hot water circuit of the appliance is modelled previously making use of the Transient System Simulation Tool (TRNSYS 18) and a good agreement is achieved with the experimental and numerical data for the economic mode simulations. The drawback of the current TRNSYS model is the dependence on the experimental data for some of the parameter definitions of the components selected from the TRNSYS library, i.e. UA (multiplication of the overall heat transfer coefficient and the heat transfer area) input of the plate heat exchanger and heat retention effect of the heat cell block. In this paper, a constant value is assigned to the parameter definition of UA instead of a time dependent varied profile. Mean absolute errors covering the steady-state and transient operating regions for the domestic hot water inlet and outlet temperature difference in economic mode simulations stay nearly the same around 0,46°C, 0,82°C, and 0,53°C for 5 l/min, 7 l/min, and 8,7 l/min, respectively, under constant and variable UA approaches. Comfort operating scheme model is established with a couple of experimental data as of the principal application of the constant UA approach. Mean absolute error of the overall domestic hot water inlet and outlet temperature difference profile decreases to 0,5°C in the comfort mode simulation.

show abstract

Section: Introductionmentioning

confidence: 99%

Trnsys Model of the Combi Boiler Domestic Hot Water Circuit With a Focus on the Parameter Definition of the Plate Heat Exchanger

GÖK,

ATMACA,

EREK

et al. 2023

Isı Bilimi Ve Tekniği Dergisi

View full text Add to dashboard Cite

show abstract

“…Bourke and Bansal (2012) [15] developed a new test method to define the annual energy consumption of a domestic solar water heater boosted with a gas instantaneous water heater making use of TRNSYS models. Persson et al (2019) [16] combined TRNSYS is a widely used simulation tool and there are many other models including space and DHW heating for other applications and comprehensive system analyses [17,18]. To sum up, there are challenging targets concerned with the combi boiler appliance concepts since they are widely used.…”

Section: Introductionmentioning

confidence: 99%

Model of the combi boiler appliance in TRNSYS for domestic hot water circuit: Experimental and numerical validations of economic mode simulations

Gök

Atmaca

Altay

et al. 2023

International Journal of Energy Studies

View full text Add to dashboard Cite

Combi boiler type heating appliances are used nearly in every residential building for both space and domestic hot water (DHW) heating functions. There are challenging targets regarding both of these functions. Since there is a huge laboratory testing procedure behind each appliance design and the structural or operational changes on the regular designs, simulation models could be established for the initial evaluations of the appliance testing. Therefore, due to the estimations from the preliminary results of the simulations, the number of the laboratory tests could be decreased with cost, time, and energy savings. In this study, the main objective is modelling DHW heating circuit of a combi boiler appliance with the help of Transient System Simulation Tool (TRNSYS 18) to calculate DHW outlet temperature under various operating conditions. The TRNSYS model is validated experimentally and compared with the previous works of the authors. A good agreement is achieved in both transient and steady-state regions and the TRNSYS model is found superior when compared to the previously established one-dimensional model of the authors. DHW circuit model is validated only for economic (eco) working mode simulations in this study. Mean absolute error (MAE), mean square error (MSE), and root mean square error (RMSE) values are compared for the outcomes of the previously constructed one-dimensional model and currently established TRNSYS model with reference to the experimental data. TRNSYS model decreases all of these errors calculated according to the overall temperature profiles including the transient region for the central heating water at the heat cell inlet, central heating water at the heat cell outlet, and the inlet and outlet temperature difference of DHW at the experimentally investigated DHW flow rates of 5 l/min, 7 l/min, and 8.7 l/min.

show abstract

“…Biomass appliances use wood logs or pellet as fuel and are divided into two groups: boilers (Haller et al 2011;Petrocelli and Lezzi 2014;Carlon et al 2015) and air stoves. The present paper focuses on the last-mentioned solution since it is the most diffused in the market, although boilers can be versatile with different integration such as solar heating (Persson et al 2019;Krarouch et al 2020) and new technologies as wood-pellet hybrid stoves (Lamberg et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Energy analysis of a wood or pellet stove in a single-family house equipped with gas boiler and radiators

et al. 2022

View full text Add to dashboard Cite

In the residential sector, biomass appliances are widely used for space heating and often combined with other systems. This work aims at comparing the final and primary energy consumption of different configurations, including a conventional and a ducted pellet stove and a wood log stove using air as heat transfer fluid. A dynamic analysis of the interaction between biomass stoves and conventional heating systems, such as gas boilers and radiators, is carried out within a typical single-family house in a mild climate, using TRNSYS software. In addition, natural ventilation of the building is considered using CONTAM, with a focus on external infiltrations and internal air circulation due to the buoyancy effect. Results show that the biomass device in one room promotes the airflows between adjacent thermal zones, enhancing the heat distribution through door openings, in particular when an air ducted stove is present. The final energy consumption resulting from simulations with wood-burning stoves is 21% higher than pellet stoves. The pellet stove results in similar final energy and a 30% increase in overall primary energy, while the wood stove increases the final energy by 22% and approximately 40% of overall primary energy compared to the case of a traditional gas system coupled to radiators which is considered as reference. Nevertheless, non-renewable primary energy savings are higher than 50% with pellet stoves and 60% with wood-log stoves.

show abstract

Modelling of dynamics and stratification effects in pellet boilers

Cited by 6 publications

References 17 publications

Trnsys Model of the Combi Boiler Domestic Hot Water Circuit With a Focus on the Parameter Definition of the Plate Heat Exchanger

Trnsys Model of the Combi Boiler Domestic Hot Water Circuit With a Focus on the Parameter Definition of the Plate Heat Exchanger

Model of the combi boiler appliance in TRNSYS for domestic hot water circuit: Experimental and numerical validations of economic mode simulations

Energy analysis of a wood or pellet stove in a single-family house equipped with gas boiler and radiators

Contact Info

Product

Resources

About