scholarly journals Exergy Analysis of Building Heating with a Groundwater Source Heat Pump

2020 ◽  
Author(s):  
Ružica Todorović ◽  
◽  
Milan Gojak ◽  
Miloš Banjac ◽  
Nedžad Rudonja
Keyword(s):  
Water Temperature ◽  
Heat Pump ◽  
Exergy Analysis ◽  
Operation Mode ◽  
Heating System ◽  
Heat Pumps ◽  
Groundwater Temperature ◽  
Monthly Basis ◽  
Pump Operation ◽  
Groundwater Heat Pump

The paper presents an exergy analysis of the groundwater heat pump operation for theneeds of building heat-ing. The analysis was conducted on a monthly basis, given the dependence of exergy on the changing state of the envi-ronment. Changes inheating coefficient and exergy efficiencyof thegeothermal heat pumpheating systemdepending onthe influentialparameters wereanalyzed: groundwater temperature fromthe pumping well, changes in the ground-water temperature on the heat pump evaporatorand water temperature inthe heating system.The obtained results provide insight into thermodynamic indicators of heat pump operation depending on the groundwater temperature and the operation mode of the building heating system. The conducted analysis provides guidelines for the design and opti-mization of heat pumps that work with groundwater as a heat source.

scholarly journals Experimental based determination of SCOP coefficient for ground-water heat pump

2018 ◽  
Vol 44 ◽  
pp. 00003
Author(s):  
Stanisław Anweiler ◽  
Maciej Masiukiewicz
Keyword(s):  
Heat Pump ◽  
Alternative Energy ◽  
Electrical Power ◽  
Heating System ◽  
Heat Pumps ◽  
Alternative Energy Sources ◽  
Thermal Output ◽  
Ground Source ◽  
Accredited Laboratory ◽  
Effective Use

The paper presents research related to the operation of an ground-source heat pump with a thermal output of 16.85 kW and an electrical power of 3.72 kW in various conditions, both from the mechanical and thermodynamic perspective. The publication contains the results of research on a selected heat pump model with an R410a refrigerant carried out in an accredited laboratory in the Czech Republic. Detailed analysis of the data in terms of changes in the COP coefficient for two heating water temperatures was carried out (35°C and 55°C) and in the range of outdoor air temperature from -10°C to 15°C every 1°C. The analysis was also carried out to determine the efficiency of the heat pump depending on the parameters of the heat source. Devices of this type, enabling effective use of environmental available thermal energy with low operating costs, meet increasingly stringent environmental protection requirements. Significant costs of heating buildings are one of the main reasons for the need to look for alternative energy sources. The heat resources contained in water, air and land are huge. Due to the fact that heat pump prices dropped significantly, and their efficiency has increased over the last few years, these devices are a real competition for conventional ways of supplying buildings with heat. Heat pumps do not require daily maintenance, are fully automated and have intuitive control. These features allow to use them as components in the system of a modern and intelligent household. It was shown that the SCOP of the tested device increased by 1% on average reaching SCOP = 4.71 for a typical external calculation temperature and for a low-temperature heating system (35°C).

scholarly journals Hybrid Carbon Dioxide Heat Pump for the Multifamily Residential Buildings in the Heat Supply System Based on CHP

2021 ◽  
pp. 91-98
Author(s):  
Mihail Sit ◽  
◽  
Anatoliy Juravliov ◽  
Keyword(s):  
Heat Exchanger ◽  
Heat Pump ◽  
Heat Supply ◽  
Single Phase ◽  
Control Valve ◽  
Heating System ◽  
Heat Pumps ◽  
Hydraulic Circuit ◽  
Heat Supply Systems ◽  
Supply Systems

The work is devoted to centralized heat supply systems based on CHP plants and the use with them heat pumps (HP) on carbon dioxide as refrigerant. Heat pumps are used in heat supply systems for buildings and use the heat of the outside air and, at the same time, the heat of the return network water (WWR) as a source of low-grade heat (LHP). The aim of the study is to develop a structural diagram of such a heat pump, where the outside air is heated by a heat exchanger installed in the return water line of the heating system, to develop a hydraulic circuit of a heat pump taking into account the law of regulation of the building heating system, to develop an algorithm for controlling the operating modes of the so-called balancing heat exchanger installed after gas cooler and internal heat exchanger of the heat pump. The most significant results were the hydraulic circuit of the heat pump, the aerodynamic circuit of the air supply path to the heat pump evaporator, the balancing heat exchanger control system, taking into account the requirement to ensure the operation of the control valve in a single-phase flow. The significance of the results obtained consisted in obtaining the dependences between the CO temperature graph and the parameters of the thermodynamic cycle of the heat pump, which ensured the operation of the control valve of the heat pump in a single-phase environment.

scholarly journals OPERATION ANALYSIS OF THE AIR-SOURCE HEAT PUMP USING TRNSYS SIMULATION TOOL

2021 ◽  
Vol 13 (0) ◽  
pp. 1-6
Author(s):  
Gabrielė Daugirdaitė ◽  
Giedrė Streckienė ◽  
Tomas Kropas
Keyword(s):  
Heat Pump ◽  
Real Data ◽  
Cold Season ◽  
Heat Pumps ◽  
Climatic Data ◽  
Pump Operation ◽  
Operation Analysis ◽  
Air Source Heat Pump ◽  
Heating Capacity ◽  
Heating Mode

In order to achieve ambitious goals for energy efficiency and requirements for near zero energy buildings, various technological solutions enabling the use of renewable energy are proposed and applied. One such rapidly spreading technology is heat pumps. However, the use of air-­to-­water heat pumps in countries where the cold season is cold and humid has unfavourable conditions for the operation of this equipment during the heating season. As a result, the performance efficiency of the equipment decreases. This article presents the simulation results of an air-­to-­water heat pump operation in Lithuania using the TRNSYS modelling tool; its nominal heating capacity is 6.55 kW. The model was calibrated using real data obtained at Vilnius Gediminas Technical University when measurements were performed under heat pump freezing conditions. The seasonal performance factor of the heat pump heating mode was determined during the calculation. Parametric analysis of the model was also performed, when sensitivity of the model to the initial climatic data was observed. Comparable results are obtained for Vilnius, Prague and London.

scholarly journals Exergy Analysis of Phase-Change Heat-Storage Coupled Solar Heat Pump Heating System

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5552
Author(s):  
Chuanhui Zhu ◽  
Shubin Yan ◽  
Xiaodong Dong ◽  
Wei Zhang ◽  
Biyi Huang ◽  
...  
Keyword(s):  
Solar Energy ◽  
Phase Change ◽  
Heat Pump ◽  
Exergy Analysis ◽  
Heat Storage ◽  
Heating System ◽  
Exergy Loss ◽  
Solar Collectors ◽  
Solar Heat ◽  
Northern Regions

With the rapid development of industrialization, the excessive use of fossil fuels has caused problems such as increased greenhouse gas emissions and energy shortages. The development and use of renewable energy has attracted increased attention. In recent years, solar heat pump heating technology that uses clean solar energy combined with high-efficiency heat pump units is the development direction of clean heating in winter in northern regions. However, the use of solar energy is intermittent and unstable. The low-valley electricity policy is a night-time electricity price policy. Heat pump heating has problems such as frosting and low efficiencies in cold northern regions. To solve these problems, an exergy analysis model of each component of a phase-change heat-storage coupled solar heat pump heating system was established. Exergy analysis was performed on each component of the system to determine the direction of optimization and improvement of the phase-change heat-storage coupled solar heat pump heating system. The results showed that optimizing the heating-end heat exchanger of the system can reduce the exergy loss of the system. When the phase-change heat-storage tank meets the heating demand, its volume should be reduced to lower the exergy loss of the tank heat dissipation. Air-type solar collectors can increase the income exergies of solar collectors.

Study of Different Types of Water Heating Systems - Under Living Lab Conditions

2019 ◽  
Author(s):  
Swapnil Dubey
Keyword(s):  
Energy Saving ◽  
Heat Pump ◽  
Heating System ◽  
Heat Pumps ◽  
Electrical Heating ◽  
Water Heating ◽  
Water Heater ◽  
Water Heaters ◽  
Living Lab ◽  
Almost All

Abstract In Singapore, roughly 20% of the energy consumed by households is used for water heating and almost all the energy consumed by conventional electric water heaters. One of the significant potential energy saving opportunities lies in using energy-efficient water heating appliances. Recently, there has been a move towards energy-saving design and the use of natural refrigerants over fluorocarbons. Unlike conventional electric storage water heaters, which use electricity to heat water directly, heat pump storage water heaters use electricity only to operate a pump that circulates refrigerants around the system. This refrigerant collects heat from the surrounding atmosphere and transfers it to the water. CO2 heat pumps have low global warming potential when compared to other refrigerants based heat pumps, has zero ozone depletion potential, inexpensive, non-flammable, generate high temperature. In this project, a comparative analysis of three different water heater types has been presented based on real-time usage and living-lab conditions under the tropical climate of Singapore. These three types are: 1. Electrical heater storage type 2. Hybrid heat pump with auxiliary electrical heating water heater 3. CO2 heat pump water heater without auxiliary heating Study found significant energy saving using CO2 heat pump compared to other water heating system and also better for environment.

scholarly journals Study on Fuzzy Control for Air-To-Water Heat Pumps Connected to a Residential Floor Heating System

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Duhui Jiang ◽  
Cui Hongshe
Keyword(s):  
Fuzzy Control ◽  
Ambient Temperature ◽  
Water Temperature ◽  
Heat Pump ◽  
Control Variable ◽  
Heating System ◽  
Radiant Heating ◽  
Heating Season ◽  
Water Control ◽  
Heat Pump Unit

Reducing the supplied water temperature of the air-to-water heat pump to meet the building heat demand can greatly improve the efficiency of the heat pump unit and give full play to the advantages of energy saving and comfort of the floor radiant heating system with an air-to-water heat pump. Based on the variation of ambient temperature and ambient temperature, the domain of fuzzy control is optimized by particle swarm optimization (PSO), and the optimal fuzzy control table is established to adjust the supplied water temperature of the air-to-water heat pump. A transient simulation model of floor radiant heating system for a typical 100 m2 building in China cold regions was developed by using TRNSYS software, and this heating system is simulated by the fuzzy control variable supplied water temperature and the conventional 45°C supplied water control in the whole heating season. The simulation results show that the system energy consumption is saved by 15.9% and SCOP increased by 18.9% by using this fuzzy control compared with the conventional 45°C supplied water control in the whole heating season under the premise of ensuring stable room temperature. Comparing conventional 45°C supplied water control, the fuzzy control can reduce CO2 emissions by 4.3 kg/m2, 4.7 kg/m2, 5.6 kg/m2, 5.2 kg/m2, and 4.9 kg/m2 in Zhengzhou, Qingdao, Beijing, Taiyuan, and Zhangjiakou, respectively.

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