Model of the combi boiler appliance in TRNSYS for domestic hot water circuit: Experimental and numerical validations of economic mode simulations
Model of the combi boiler appliance in TRNSYS for domestic hot water circuit: Experimental and numerical validations of economic mode simulations
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.
Keywords:
Combi boilers, Domestic hot water (DHW) circuit, TRNSYS model, One-dimensional (1D) modelling,
___
- [1] Atmaca AU, Erek A, Altay HM. Investigation of transient behaviour of combi boiler type appliances for domestic hot water. Applied Thermal Engineering 2015; 82: 129-140.
- [2] Atmaca AU, Erek A, Altay HM. Comparison of two numerical approaches to the domestic hot water circuit in a combi boiler appliance. Energy and Buildings 2016; 127: 1043-1056.
- [3] BS EN 13203-1:2006. Gas-fired domestic appliances producing hot water- appliances not exceeding 70 kW heat input and 300 L water storage capacity - part 1: assessment of performance of hot water deliveries. 2006.
- [4] Boait PJ, Dixon D, Fan D, Stafford A. Production efficiency of hot water for domestic use. Energy and Buildings 2012; 54: 160-168.
- [5] Pärisch P, van der Veer N, Kirchner M, Giovannetti F, Lampe C. Comfort assessment of tankless water heaters: review and suggestions. International Energy Agency Solar Heating & Cooling Programme (IEA SHC) International Conference on Solar Heating and Cooling for Buildings and Industry, Santiago, Chile, 2019.
- [6] Pomianowski MZ, Johra H, Marszal-Pomianowska A, Zhang C. Sustainable and energy-efficient domestic hot water systems: a review. Renewable and Sustainable Energy Reviews 2020; 128: 109900.
- [7] Haissig CM, Woessner M. An adaptive fuzzy algorithm for domestic hot water temperature control of a combi-boiler. HVAC&R Research 2000; 6(2): 117-134.
- [8] Ucar M, Arslan, O. Assessment of improvement potential of a condensed combi boiler via advanced exergy analysis. Thermal Science and Engineering Progress 2021; 23: 100853.
- [9] Fridlyand A, Guada AB, Kingston T, Glanville P. Modeling modern, residential, combined space and water heating systems using EnergyPlus. ASHRAE Transactions 2021; 127: 135-142.
- [10] Quintã AF, Ferreira JAF, Ramos A, Martins NAD, Costa VAF. Simulation models for tankless gas water heaters. Applied Thermal Engineering 2019; 148: 944–952.
- [11] Jordan U, Vajen K. Influence of the dhw load profile on the fractional energy savings: a case study of a solar combi-system with TRNSYS simulations. Solar Energy 2001; 69: 197-208.
- [12] Andrés AC, López JMC. TRNSYS model of a thermosiphon solar domestic water heater with a horizontal store and mantle heat exchanger. Solar Energy 2002; 72(2): 89-98.
- [13] Nordlander SG, Persson TG. Evaluation and computer modelling of wood pellet stoves with liquid heat exchanger. International Solar Energy Society (ISES) World Conference, Gothenburg, Sweden, 2003.
- [14] Persson T, Fiedler F, Nordlander S, Bales C, Paavilainen J. Validation of a dynamic model for wood pellet boilers and stoves. Applied Energy 2009; 86(5): 645-656.
- [15] Bourke G, Bansal P. New test method for gas boosters with domestic solar water heaters. Solar Energy 2012; 86(1): 78-86.
- [16] Persson T, Wiertzema H, Win KM, Bales C. Modelling of dynamics and stratification effects in pellet boilers. Renewable Energy, 2019; 134: 769-782.
- [17] Antoniadis CN, Martinopoulos G. Optimization of a building integrated solar thermal system with seasonal storage using TRNSYS. Renewable Energy 2019; 137: 56-66.
- [18] Villa-Arrieta M, Sumper A. A model for an economic evaluation of energy systems using TRNSYS. Applied Energy 2018; 215: 765–777.
- [19] Incropera FP, Dewitt DP, Bergman TL, Lavine AS. Fundamentals of heat and mass transfer (6th edition). John Wiley & Sons, Inc, USA, 2007.
- Yayın Aralığı: Yılda 4 Sayı
- Başlangıç: 2016
- Yayıncı: Türkiye Enerji Stratejileri ve Politikaları Araştırma Merkezi (TESPAM)
Sayıdaki Diğer Makaleler
A comprehensive survey of the urban building energy modeling (UBEM) process and approaches
Okan GÖK, Ayşe Uğurcan ATMACA, Hürrem Murat ALTAY, Aytunç EREK
Simulation of a PV module at different set-up and operating conditions to give I-V and P-V curves
Anas BALA, Jamilu Ya'u MUHAMMAD, Kadawa Ibrahim ALİ, Richard Balthia MSHELLİA
Effect of material on efficiency in alternators used in wind energy
Small hydropower development in Turkey: An overview of 2021
Ensuring energy balance for sudden demand changes in smart grids