Research of the energy efficiency of a combined air and water heating of a public building

2021 ◽  
Vol 14 (2) ◽  
pp. 124-131
Author(s):  
K. A. Ignatiev ◽  
E. R. Giniyatullin ◽  
M. G. Ziganshin
Keyword(s):  
Energy Efficiency ◽  
Indoor Air ◽  
Energy Efficient ◽  
Heating System ◽  
Temperate Climate ◽  
Water Heating ◽  
Efficient Control ◽  
Temperature And Humidity ◽  
Academic Building ◽  
Continental Climate

Combined air and water heating schemes have been actively used recently for heating public and residential premises. They have certain advantages in countries with a warm climate, whereas in a temperate climate, their use may be unfeasible. The most effective regulation of the heating system in the building can be expected, if all the technology specifics are taken into account, in terms of both the purpose of the room and the methods of regulation. A system focused only on weather-based regulation falls short of meeting to energy-efficient control classes: a heat carrier with the same temperature is distributed among rooms with different requirements for temperature and humidity characteristics. The issues of ensuring the energy efficiency of the combined air and water heating system in public buildings for the temperate continental climate of Russia — the academic building (AB) and laboratory building (LB) of the Kazan State Energy University (KSEU) have been considered. Heating devices of the KSEU heating system have manual control valves installed in the premises, or radiator valves with thermostatic heads, but without room controllers, which does not meet the energy-efficient control classes. An experimental survey of the functioning of the heating system of the KSEU buildings during the 2019 – 2020 and 2020 – 2021 heating seasons was conducted. The optical pyrometry method was used to measure the temperature of the surfaces of windows, walls and elements of the heating system, as well as the temperature and humidity of the air in lecture rooms and corridors of the AB and LB of the KSEU. The parameters of heating devices and indoor air in rooms of various purposes were found compliant with the current sanitary and hygienic requirements. At the same time, the need to switch to a higher class of regulation has been revealed, since, under the current situation, the parameters of the indoor air depend on the outdoor temperature: in the abnormally warm winter of 2020, the indoor air temperature was at the edge of the maximum permissible value, while in the normal climate of winter of 2021, it was at the edge of the minimum permissible value.

scholarly journals Energy Efficient Approaches by Retrofitting Heat Pumps Water Heating System for a University Dormitory

Buildings ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 356
Author(s):  
Fujen Wang ◽  
Kusnandar ◽  
Hungwen Lin ◽  
Minghua Tsai
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Heat Pump ◽  
Energy Efficient ◽  
Energy Savings ◽  
Heating System ◽  
Energy Simulation ◽  
Water Heating ◽  
Pump System ◽  
Heat Pump System

With the cost of energy rising, the value of conservation grows. Interest in energy efficiency could be a sound investment or a necessary public policy. Heat pump systems provide economical alternatives of recovering heat from different sources for use in various applications. The objective of this study is to present the strategic approach on the energy efficient analysis of the water heating system retrofitted by applying a heat pump system in the dormitory of a university. Energy savings were determined by comparing field measurements of water consumption, water temperature and power consumption of the overall system before (electric resistance heating system) and after (heat pump heating system) the implementation of this project. Furthermore, the building energy simulation code (eQuest) has been applied to verify and predict the long-term energy consumption for both water heating systems. The results from energy modelling revealed the good agreement for energy simulation and field measurement data and the improvement of energy efficiency and energy savings could be achieved satisfactorily by retrofitting of a heat pump system. The energy conversion efficiency of hot water for energy consumption at 0.63 (Mcal/Mcal) could be achieved after the application of heat pump water heating system. It also presented the annual saving about USD 20,000 (NTD 600,000) for the dorm by using a heat pump heating system under the electrical billing rate of Taiwan.

scholarly journals Study of Energy Efficiency Solutions for a Smart Water Heating System

2021 ◽  
Vol 16 (1) ◽  
pp. 43-49
Author(s):  
Najat Abdeljebbar ◽  
Abdelwahab Haddaoui
Keyword(s):  
Energy Efficiency ◽  
Renewable Energy ◽  
Water Consumption ◽  
Natural Water ◽  
Smart Cities ◽  
Heating System ◽  
Heat Pumps ◽  
Hot Water ◽  
Water Heating ◽  
Smart Water

The preservation of natural water and electricity resources is essential for the development of smart cities. Indeed, water and electricity are highly dependent and must be analyzed together to improve the energy efficiency. This article is about the study of the integration of renewable energy and smart solutions in a water heating system. The existing system uses mainly heat pumps to cover the most of the hot water needs. The purpose of this work is to explore possible solutions to optimize the electricity and the water consumption of the installation.

scholarly journals Thermal loss analysis of a solar flat collector using numerical simulation

2020 ◽  
Author(s):  
Timur Merembayev ◽  
Yedilkhan Amirgaliyev ◽  
Murat Kunelbayev ◽  
Abdumauvlen Berdyshev
Keyword(s):  
Energy Efficiency ◽  
Solar System ◽  
Heat Supply ◽  
Life Support ◽  
Heating System ◽  
Heat Losses ◽  
Hot Water ◽  
Physical Parameters ◽  
Water Heating ◽  
Solar Water Heating System

In this paper, we studied theoretically and numerically heat losses of a flat solar collector for the subsequent modelling of the solar water heating system for the Kazakhstan climate condition. For different climatic zones with a growing cost for energy or lack of central heating systems, promising is to find ways to improve the energy efficiency of the solar system. The solar system is simulated by the mathematical model (ODE model) of energy. To bridge the results of modelling and real values, our research investigated the important physical parameters such as loss coefficient, Nu, Ra, Pr values, which are impacting on the efficiency of solar flat collector and for heat losses of system. The developed mathematical models, the design and composition of the software and hardware complex, automated control and monitoring systems allow solar hot water heating system to increase the energy efficiency of a life support systems and heat supply of buildings, by reducing energy consumption for heat supply.

Design and heat flow analysis of a commercial energy efficient in-line water heating system

2014 ◽  
Vol 11 (3) ◽  
pp. 239-246
Author(s):  
R. Gouws ◽  
E. le Roux
Keyword(s):  
Energy Consumption ◽  
Heat Flow ◽  
Energy Efficient ◽  
Flow Analysis ◽  
Heating System ◽  
Central Processor ◽  
Water Heating ◽  
Temperature And Pressure ◽  
Pressure Analysis ◽  
Commercial Energy

In this paper, the authors provide the design, heat flow analysis and pressure analysis of a commercial energy efficient in-line water heating system in South Africa. The designed commercial in-line water heating system captures the energy consumption, flow rate, temperature and pressure during operation and accordingly responds on these values to increase the energy efficiency of the system. The user is constantly aware of the energy consumption and cost during operation and can choose to switch to a more economical setting to conserve energy. A central processor with PID control was used to optimize the energy consumption of the in-line water heating system. An overview on the design and results of the heat flow analysis and pressure analysis are provided.

Tips on Design of Energy Efficient Hospitals Air Conditioning Systems

2010 ◽  
Author(s):  
Essam E. Khalil
Keyword(s):  
Energy Efficiency ◽  
Indoor Air ◽  
Energy Efficient ◽  
Air Conditioning ◽  
Numerical Approach ◽  
Healthcare Applications ◽  
Energy Efficient Buildings ◽  
Operating Theatres ◽  
Air Conditioning Systems ◽  
Careful Design

Energy Efficiency and Indoor Air Quality in the healthcare applications and particularly in surgical operating theatres are important features in modernized designs. The various reasons for deviation from obtaining optimum IAQ and energy efficient buildings are listed. The air conditioning systems serving the operating rooms require careful design to minimize the concentration of airborne organisms. Numerical approach is an appropriate tool to be utilized to adequately identify the airflow patterns temperatures and relative humidity distributions and hence energy efficient designs.

scholarly journals Exploring Climate-Change Impacts on Energy Efficiency and Overheating Vulnerability of Bioclimatic Residential Buildings under Central European Climate

2021 ◽  
Vol 13 (12) ◽  
pp. 6791
Author(s):  
Luka Pajek ◽  
Mitja Košir
Keyword(s):  
Climate Change ◽  
Energy Efficiency ◽  
Energy Efficient ◽  
Energy Demand ◽  
Energy Use ◽  
Residential Buildings ◽  
Building Design ◽  
Temperate Climate ◽  
Design Parameters ◽  
Central European

Climate change is expected to expose the locked-in overheating risk concerning bioclimatic buildings adapted to a specific past climate state. The study aims to find energy-efficient building designs which are most resilient to overheating and increased cooling energy demands that will result from ongoing climate change. Therefore, a comprehensive parametric study of various passive building design measures was implemented, simulating the energy use of each combination for a temperate climate of Ljubljana, Slovenia. The approach to overheating vulnerability assessment was devised and applied using the increase in cooling energy demand as a performance indicator. The results showed that a B1 heating energy efficiency class according to the Slovenian Energy Performance Certificate classification was the highest attainable using the selected passive design parameters, while the energy demand for heating is projected to decrease over time. In contrast, the energy use for cooling is in general projected to increase. Furthermore, it was found that, in building models with higher heating energy use, low overheating vulnerability is easier to achieve. However, in models with high heating energy efficiency, very high overheating vulnerability is not expected. Accordingly, buildings should be designed for current heating energy efficiency and low vulnerability to future overheating. The paper shows a novel approach to bioclimatic building design with global warming adaptation integrated into the design process. It delivers recommendations for the energy-efficient, robust bioclimatic design of residential buildings in the Central European context, which are intended to guide designers and policymakers towards a resilient and sustainable built environment.

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