Comparisons of Measured and Simulated Performance for CSU House I

1980 ◽  
Vol 102 (3) ◽  
pp. 192-195 ◽  
Author(s):  
J. W. Mitchell ◽  
W. A. Beckman ◽  
M. J. Pawelski
Keyword(s):  
System Analysis ◽  
Storage System ◽  
Water System ◽  
Simulation Models ◽  
Heating System ◽  
Daily Basis ◽  
Hot Water ◽  
Weather Data ◽  
Determine Parameter ◽  
Domestic Hot Water

The heating system for CSU House I is simulated using TRNSYS, and simulation results are compared to the measured performance. The heating system is composed of a liquid collection and storage system, a domestic hot water system, and an air delivery system. The components were modeled using standard TRNSYS components. Measured weather data from the site were employed as the driving function. Measured energy quantities, including the useful gain from solar, that supplied to the house and the domestic hot water system, and the auxiliary were compared to those from the simulation for three periods of six to eleven days each. Comparisons were made on both a daily basis and over the entire period. The simulated energy quantities are found to agree with the data within the accuracy of the measurements. Simulated hourly values of storage tank temperatures are compared to those measured. Although there are differences of up to 5°C between the two at times, the agreement is generally within 2°C. These results help establish the validity of simulation methods for system analysis. Conventional engineering techniques can be used to formulate component models and determine parameter values. Verified simulation models can be then used to predict long term system performance.

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 THE USE OF SOLAR ENERGY FOR PREPARING DOMESTIC HOT WATER IN A MULTI-STOREY BUILDING / SAULĖS ENERGIJOS PANAUDOJIMAS KARŠTAM VANDENIUI RUOŠTI DAUGIABUČIAME NAME

2012 ◽  
Vol 5 (4) ◽  
pp. 507-512 ◽  
Author(s):  
Giedrius Šiupšinskas ◽  
Solveiga Adomėnaitė
Keyword(s):  
Flat Plate ◽  
Water System ◽  
District Heating ◽  
Heating System ◽  
Hot Water ◽  
Solar Collectors ◽  
District Heating System ◽  
Climate Conditions ◽  
Domestic Hot Water ◽  
Life Project

The article analyses the possibilities of solar collectors used for a domestic hot water system and installed on the roofs of modernized multi-storey buildings under the existing climate conditions. A number of combinations of flat plate and vacuum solar collectors with accumulation tank systems of various sizes have been examined. Heat from the district heating system is used as an additional heat source for preparing domestic hot water. The paper compares calculation results of energy and economy regarding the combinations of flat plate and vacuum solar collectors and the size of the accumulation tank. The influence of variations in the main indicators on the final economic results has also been evaluated. Research has been supported applying EC FP7 CONCERTO program (‘‘Sustainable Zero Carbon ECO-Town Developments Improving Quality of Life across EU - ECO-Life’’ (ECO-Life Project) Contract No. TREN/FP7EN/239497/”ECOLIFE”). Santrauka Straipsnyje analizuojamos saulės kolektorių, skirtų karšto vandentiekio sistemai ant modernizuojamų daugiabučių namų stogų įrengti esamomis klimatinėmis sąlygomis galimybės. Nagrinėjamos įvairaus dydžio plokščiųjų ir vakuuminių saulės kolektorių su akumuliacinėmis talpyklomis sistemų kombinacijos. Kaip papildomas šilumos šaltinis karštam vandeniui pašildyti naudojama iš centralizuotų šilumos tinklų tiekiama šiluma. Lyginami plokščiųjų, vakuuminių saulės kolektorių ir akumuliacinio bako dydžio kombinacijų energinių ir ekonominių skaičiavimų rezultatai. Įvertinama kai kurių esminių rodiklių pokyčių įtaka galutiniams ekonominiams rodikliams.

scholarly journals Overview of Solutions for the Low-Temperature Operation of Domestic Hot-Water Systems with a Circulation Loop

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3350
Author(s):  
Theofanis Benakopoulos ◽  
William Vergo ◽  
Michele Tunzi ◽  
Robbe Salenbien ◽  
Svend Svendsen
Keyword(s):  
Low Temperature ◽  
Heat Loss ◽  
District Heating ◽  
Heating System ◽  
Hot Water ◽  
Heating Power ◽  
Circulation Loop ◽  
Space Heating ◽  
District Heating System ◽  
Domestic Hot Water

The operation of typical domestic hot water (DHW) systems with a storage tank and circulation loop, according to the regulations for hygiene and comfort, results in a significant heat demand at high operating temperatures that leads to high return temperatures to the district heating system. This article presents the potential for the low-temperature operation of new DHW solutions based on energy balance calculations and some tests in real buildings. The main results are three recommended solutions depending on combinations of the following three criteria: district heating supply temperature, relative circulation heat loss due to the use of hot water, and the existence of a low-temperature space heating system. The first solution, based on a heating power limitation in DHW tanks, with a safety functionality, may secure the required DHW temperature at all times, resulting in the limited heating power of the tank, extended reheating periods, and a DH return temperature of below 30 °C. The second solution, based on the redirection of the return flow from the DHW system to the low-temperature space heating system, can cool the return temperature to the level of the space heating system return temperature below 35 °C. The third solution, based on the use of a micro-booster heat pump system, can deliver circulation heat loss and result in a low return temperature below 35 °C. These solutions can help in the transition to low-temperature district heating.

Problem about Solar Water Heating System and Residential Building Integrated

2012 ◽  
Vol 193-194 ◽  
pp. 30-33
Author(s):  
Xue Ying Wang ◽  
Dong Xu ◽  
Ya Jun Wu
Keyword(s):  
Solar Energy ◽  
Integrated Design ◽  
Water System ◽  
Residential Building ◽  
Heating System ◽  
Hot Water ◽  
Solar Water Heating ◽  
Drainage Design ◽  
Hot Water Supply ◽  
Solar Water Heating System

This article analyzes the problem in application the solar system was used in residential building, puts forward the requirements to use energy and choose the setting of the solar energy collector from two aspects of building and drainage design respectively. In addition, the article explicates andthe solar energy collector and building integrated design and the development of solar energy collector. At last, the article puts forward some Suggestions on the improvement and development of residential solar hot water system and the design of the hot water supply bath solution of practice to make solar energy and low power assisted by night combining.

An Experimental Study of Different Thermal Boxes Heated by Solar Thermal Radiation for Hot Water System at Daytime

2013 ◽  
Vol 315 ◽  
pp. 783-787
Author(s):  
M.Yaakob Yuhazri ◽  
A.M. Kamarul ◽  
A.H. Rahimah ◽  
Sihombing Haeryip ◽  
S.H. Yahaya
Keyword(s):  
Energy Source ◽  
Water System ◽  
Heating System ◽  
Black Body ◽  
Hot Water ◽  
Experimental Result ◽  
Water Heating ◽  
Trapped Air ◽  
Current Water ◽  
Tropical Weather

This research is related to thermal efficient water heating system, specifically to improve the water heating system that exists nowadays. The goal of this research is to improve the current water heating system by using solar heat as the energy source to heat the water. The focus is to improve the thermal efficiency by adding different thermal boxes as the absorber bed. By implementing the black body and radiation concept, the air trapped in the box is heated. The trapped air then increases the collisions between the molecules and directly increases the temperature inside the box, higher than the outside environment. Based on a daytime experimental result revealed steel thermal box is better to be used for tropical weather like Malaysia.

Simulation of a combined heating, cooling and domestic hot water system based on ground source absorption heat pump

2014 ◽  
Vol 126 ◽  
pp. 113-122 ◽  
Author(s):  
Wei Wu ◽  
Tian You ◽  
Baolong Wang ◽  
Wenxing Shi ◽  
Xianting Li
Keyword(s):  
Heat Pump ◽  
Water System ◽  
Hot Water ◽  
Absorption Heat Pump ◽  
Domestic Hot Water ◽  
Ground Source

scholarly journals Analysis and Adaptation of Q-Learning Algorithm to Expert Controls of a Solar Domestic Hot Water System

2019 ◽  
Vol 2 (2) ◽  
pp. 15 ◽  
Author(s):  
Bettoni ◽  
Soppelsa ◽  
Fedrizzi ◽  
del Toro Matamoros
Keyword(s):  
Control Algorithm ◽  
Fuzzy Controller ◽  
Learning Algorithm ◽  
Water System ◽  
Hot Water ◽  
Reference Case ◽  
Domestic Hot Water ◽  
Q Learning ◽  
Performance Factor ◽  
Seasonal Performance

This paper discusses the development of a coupled Q-learning/fuzzy control algorithm to be applied to the control of solar domestic hot water systems. The controller brings the benefit of showing performance in line with the best reference controllers without the need for devoting time to modelling and simulations to tune its parameters before deployment. The performance of the proposed control algorithm was analysed in detail concerning the input membership function defining the fuzzy controller. The algorithm was compared to four standard reference control cases using three performance figures: the seasonal performance factor of the solar collectors, the seasonal performance factor of the system and the number of on/off cycles of the primary circulator. The work shows that the reinforced learning controller can find the best performing fuzzy controller within a family of controllers. It also shows how to increase the speed of the learning process by loading the controller with partial pre-existing information. The new controller performed significantly better than the best reference case with regard to the collectors’ performance factor (between 15% and 115%), and at the same time, to the number of on/off cycles of the primary circulator (1.2 per day down from 30 per day). Regarding the domestic hot water performance factor, the new controller performed about 11% worse than the best reference controller but greatly improved its on/off cycle figure (425 from 11,046). The decrease in performance was due to the choice of reward function, which was not selected for that purpose and it was blind to some of the factors influencing the system performance factor.

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