Simulation Study for the Performance of a Large Solar Hot Water System Constructed by Natural Circulation Solar DHW System Modules

2012 ◽  
Author(s):  
Ru Yang ◽  
Kuan-Hsiang Yu
Keyword(s):  
Numerical Simulation ◽  
Simulation Study ◽  
System Performance ◽  
Natural Circulation ◽  
Water System ◽  
Hot Water ◽  
Operating Parameters ◽  
Theoretical Support ◽  
System Operating

This research is aimed to study the system performance for a large solar hot water system constructed by connecting a series of small domestic natural-circulation systems. This type of large solar hot water system has been recently installed in Taiwan without either practical or theoretical support. There are few studies on this type of large solar hot water system available. This paper presents the numerical simulation study for the control and the system operating parameters effects on the system performance to provide important information both for users and system designers.

scholarly journals Numerical Simulation Study for the Performance of a Large Solar Hot Water System With Horizontal Storage Tank

2015 ◽  
Author(s):  
Ru Yang ◽  
Geng-Yi Lin
Keyword(s):  
Numerical Simulation ◽  
System Performance ◽  
Storage Tank ◽  
Large Scale ◽  
Cooling System ◽  
Water System ◽  
Thermal Storage ◽  
Hot Water ◽  
Design Parameters ◽  
Total Load

A large solar hot water system can be utilized to provide driving energy for heating system, heat-driven cooling system, as well as to provide hot water. This research addresses the effects of the storage tank design parameters on the performance of a large-scale solar hot water system with a horizontal storage tank. Most literatures only considered the stratification performance of the thermal storage tank itself instead of considering the overall system performance. Also, there is lack of experimental research data available for the design purpose. Therefore, this study employs a numerical simulation technique to study the design parameters effect of a horizontal thermal storage tank on the performance of a large-scale solar hot water system. In this study, the ANSYS-CFX program is employed to calculate the flow and temperature distributions inside horizontal thermal storage tank. Then the inlets and outlets of the tank are combined with the TRNSYS program to simulate the entire system performance under the weather of three representative cities of Taiwan, (Taipei, Taichung and, Kaohsiung). The results of the present study indicate that the vertical stratification baffles in the tank have important effects on system performance improvement. Quantitative increase of solar fraction of the total load is obtained. The comparison with the system with vertical storage tank is provided. The results of the present study can provide important reference for the large solar hot water system design in improving system efficiency.

The Maximum Potential Energy Savings from Optimizing Cold Deck and Hot Deck Reset Schedules for Dual Duct VAV Systems

1999 ◽  
Vol 121 (3) ◽  
pp. 171-175 ◽  
Author(s):  
Mingsheng Liu ◽  
David E. Claridge
Keyword(s):  
Potential Energy ◽  
Thermal Energy ◽  
System Performance ◽  
Energy Savings ◽  
Physical Models ◽  
Operating Parameters ◽  
Basic System ◽  
Variable Air Volume ◽  
Air Volume ◽  
System Operating

This paper presents the physical models for the maximum potential thermal energy savings from optimizing the hot deck and cold deck reset schedules for dual duct variable air volume systems. The maximum potential savings can be determined by using these models combined with basic system operating parameters and bin data. The system performance can be evaluated by comparing the actual savings with the maximum potential savings. The energy savings from optimal cold deck and hot deck reset schedules in multi-zone buildings should be at least 75 percent of the maximum potential savings.

scholarly journals Glazed Photovoltaic-thermal (PVT) Collectors for Domestic Hot Water Preparation in Multifamily Building

2020 ◽  
Vol 12 (15) ◽  
pp. 6071
Author(s):  
Nikola Pokorny ◽  
Tomáš Matuška
Keyword(s):  
Thermal Energy ◽  
Simulation Study ◽  
Water System ◽  
Hot Water ◽  
Electrical Performance ◽  
Electricity Production ◽  
Thermal System ◽  
Conventional System ◽  
Domestic Hot Water ◽  
Photovoltaic Thermal System

Photovoltaic–thermal collector generates electrical and thermal energy simultaneously from the same area. In this paper performance analysis of a potentially very promising application of a glazed photovoltaic–thermal collector for domestic hot water preparation in multifamily building is presented. Solar system in multifamily building can be installed on the roof or integrated in the façade of the building. The aim of this simulation study is to show difference of thermal and electrical performance between façade and roof installation of a glazed photovoltaic-thermal collectors at three European locations. Subsequently, this study shows benefit of photovoltaic-thermal collector installation in comparison with side-by-side installation of conventional system. For the purpose of simulation study, mathematical model of glazed photovoltaic-thermal collector has been experimentally validated and implemented into TRNSYS. A solar domestic hot water system with photovoltaic–thermal collectors generates more electrical and thermal energy in comparison with a conventional system across the whole of Europe for a particular installation in a multifamily building. The specific thermal yield of the photovoltaic–thermal system ranges between 352 and 582 kWh/m2. The photovoltaic–thermal system electric yield ranges between 63 and 149 kWh/m2. The increase in electricity production by the photovoltaic–thermal system varies from 19% to 32% in comparison with a conventional side-by-side system. The increase in thermal yield differs between the façade and roof alternatives. Photovoltaic-thermal system installation on the roof has higher thermal yield than conventional system and the increase of thermal yield ranges from 37% to 53%. The increase in thermal yield of façade photovoltaic-thermal system is significantly higher in comparison with a conventional system and ranges from 71% to 81%.

A Numerical Simulation Study for the Performance of a Multi-Purpose Large Solar Hot Water System Operated in Taiwan

2016 ◽  
Author(s):  
Ru Yang ◽  
Yu-Ting Yen
Keyword(s):  
Simulation Study ◽  
Air Conditioning ◽  
Storage Capacity ◽  
Water System ◽  
Hot Water ◽  
Climate Data ◽  
Domestic Hot Water ◽  
Computer Simulation Program ◽  
Heating Load ◽  
Evacuated Tube

There is rich solar energy in Taiwan, it also has a great developing potential for solar applications. Solar hot water is able to supply the domestic hot water, the heating load, and the driving energy for absorption cooing. In this paper, a computer simulation program for a multi-purpose solar hot water system providing hot water, winter heating and summer air-conditioning is established by TRNSYS program. Simulation study is done with varying parameters including collector area, storage capacity and type of collector (flat plate and evacuated tube). In order to study the system performance in Taiwan, system simulations are made under the climate data of three representative cities (Taipei in north, Taichung in central, and Kaohsiung in southern) of Taiwan. The results of the present study can provide important reference for the development of the multi-purpose solar hot water system.

Measured and Simulated Performance of a Solar Domestic Hot Water System

1988 ◽  
Vol 12 (2) ◽  
pp. 89-98
Author(s):  
T. Naegele ◽  
J.E. Hay
Keyword(s):  
System Performance ◽  
Water System ◽  
Thermal Conditions ◽  
Heating System ◽  
Daily Basis ◽  
Hot Water ◽  
Actual System ◽  
Domestic Hot Water ◽  
Simulated Performance ◽  
Model Predictions

A commercially available solar domestic hot water heating system installed in a private residence in Vancouver. Canada has has been intensively monitored over a four month period. Simulation of the system was performed using a modified version of the WATSUN-3 Domestic Hot Water (DHWA) model. Model predictions are compared against actual system measurements on an hourly and daily basis. Reults show that the model is able to consistently track thermal conditions within the system and is capable of predicting system performance to within 5 percent.

scholarly journals Numerical Simulation of a Solar Domestic Hot Water System

2014 ◽  
Vol 547 ◽  
pp. 012015 ◽  
Author(s):  
L Mongibello ◽  
N Bianco ◽  
M Di Somma ◽  
G Graditi ◽  
V Naso
Keyword(s):  
Numerical Simulation ◽  
Water System ◽  
Hot Water ◽  
Domestic Hot Water
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