EFFICIENCY OF USING HEAT PUMPS IN AIR CONDITIONING SYSTEMS

2021 ◽  
Vol 3 (1) ◽  
pp. 014-018
Author(s):  
A. S. Kovaleva ◽  
◽  
I. A. KABANOVA ◽  
◽  
◽  
...  
Keyword(s):  
Heat Pump ◽  
Air Conditioning ◽  
Heat Pumps ◽  
Economic Importance ◽  
Point Of View ◽  
Safe Operation ◽  
Preliminary Study ◽  
Air Conditioning Systems ◽  
Working Agent ◽  
Basic Configuration

This article discusses the relevance of the use of heat pumps in air conditioning systems. The features of the use of passive and active air conditioning schemes with the use of heat pumps are considered. The object of the study is the SCR of an administrative building in the basic configuration and with the use of a heat pump. For a comparative assessment of the energy efficiency of the SCR, a preliminary study was carried out on the choice of the working agent of the heat pump. The paper shows the technical and economic importance of using these circuit solutions for SCR from the point of view of solving energy saving issues and ensuring the safe operation of the system as a whole.

scholarly journals Comparison of Two Solar PV-Driven Air Conditioning Systems with Different Tracking Modes

Energies ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3585
Author(s):  
Elisa Marrasso ◽  
Carlo Roselli ◽  
Francesco Tariello
Keyword(s):  
Heat Pump ◽  
Reference System ◽  
Air Conditioning ◽  
Power Grid ◽  
Heat Pumps ◽  
Photovoltaic System ◽  
Heating And Cooling ◽  
Electric Heat ◽  
Hybrid Configuration ◽  
Air Conditioning Systems

In this paper two solar electric-driven air conditioning systems are compared and analyzed from an energy and environmental point of view. Both systems satisfy the electricity, space heating and cooling needs of an existing multi-purpose, multi-story building that is simulated with TRNSYS 17. The first one, considered as reference system, is based on a centralized electric heat pump coupled with a conventional photovoltaic plant installed 10 years ago. The second one, hereinafter proposed system, has a hybrid configuration, consisting of a ground-source heat pump, a low temperature thermal network and a series of electric heat pumps, one per apartment. In addition, the plant is connected to a high-performance commercial photovoltaic system equipped with a solar tracking system to the panels. Five different solutions realized with vertical, two horizontal orientations, polar and two-axis trackers are taken into account and compared with the standard fixed configuration. The last hybrid configuration can be seen as an upgrade of an existing decentralized air conditioning system in which the local electric heat pumps are converted in water-to-water devices that interact with the thermal grid representing the heat source/sink for them. In both solar electric heating and cooling plants the photovoltaic system is installed on the building roof and it produces electricity to feed the heat pumps and end-users. The electricity surplus or the load not covered by solar field is fed to/taken from power grid. The energy and environmental analyses have been performed by considering both average annual and monthly values of power grid efficiency and CO2 emission factor for electricity. By comparing reference system and proposed one equipped with a two-axis tracker system a primary fossil energy saving of 101.67% is achieved in summer period and 28.10% in winter period. These percentages are the highest values recorded, even if, for all configurations the energy analysis rewards the proposed system. The results of environmental analysis demonstrate that the reference system has the worst performances compared to proposed system with all solar tracker systems selected guarantying positive values for avoided carbon dioxide index up to 45.86%.

Investigation on the Intake Process for a Theoretical Twin Opposite Piston Compressor Using R744 Refrigerant

2016 ◽  
Vol 823 ◽  
pp. 75-78
Author(s):  
Doru Groza ◽  
Dan Mihai Dogariu
Keyword(s):  
Air Conditioning ◽  
Piston Compressor ◽  
Environmental Issues ◽  
Point Of View ◽  
Vapor Compression ◽  
Household Appliances ◽  
Intake Process ◽  
Vapor Compression Refrigeration ◽  
Energetic Point ◽  
Air Conditioning Systems

This study aims to validate the use of R744 for a resonant twin piston compressor for domestic applications. The vapor-compression refrigeration is the most commonly approached method for cooling household appliances such as refrigerators and air conditioning systems. The R134a refrigerant is one of the most suitable refrigerants from an energetic point of view. R744 (CO2) compressors are less efficient, but the fact that the R134a raises serious environmental issues pushes commercial trend towards the usage of R744 [1]-[3]. Use of R744 in household appliances is currently an open topic and no company has switched yet to the environmental-friendly alternative. In this paper the fill efficiency will be simulated in order to validate if a conventional compressor such as the opposite twin piston compressor is capable of filling with refrigerant when operating at a 50Hz frequency. Such a validation can enable further investigations regarding the replacement of R134a with R744.

Main Existing Problems and Respective Countermeasures of Ground-Source Heat Pump Technique Applications

2013 ◽  
Vol 433-435 ◽  
pp. 2327-2330
Author(s):  
Zhen Li ◽  
Wei Wei Wang
Keyword(s):  
Heat Pump ◽  
Air Conditioning ◽  
Ground Source Heat Pump ◽  
Existing Problems ◽  
Ground Source ◽  
Air Conditioning Systems

Based on the investigation results of 40 operation projects of ground-source heat pump air-conditioning systems in Shandong, analyses the problems of ground source heat pump existed in project application and puts forward respective technical and management countermeasures, providing reference for other similar applications.

Economic Evaluation of Ground-Source Heat Pump Air-Conditioning Systems

2012 ◽  
Vol 512-515 ◽  
pp. 1125-1128
Author(s):  
Liang Chen ◽  
Chao Zhang ◽  
Yong Li
Keyword(s):  
Economic Evaluation ◽  
Heat Pump ◽  
Air Conditioning ◽  
Evaluation Methods ◽  
Ground Source Heat Pump ◽  
Air Conditioning System ◽  
Investment Projects ◽  
Ground Source ◽  
Air Conditioning Systems

Analyze economically and make evaluation of several investment projects of ground-source heat pump combining relevant economic evaluation methods. Compare this system with other conventional air conditioning systems in economic input to provide suggestions for applying and promoting the ground-source heat pump air-conditioning system.

scholarly journals Experimental studies of energy efficiency of heat pump equipment for hot water supply and air conditioning systems in apartment buildings

2021 ◽  
Vol 937 (4) ◽  
pp. 042037
Author(s):  
Gregory Vasilyev ◽  
Victor Gornov ◽  
Marina Kolesova ◽  
Vitaliy Leskov ◽  
Victoria Silaeva ◽  
...  
Keyword(s):  
Water Supply ◽  
Heat Pump ◽  
Air Conditioning ◽  
Energy Savings ◽  
Experimental Studies ◽  
Hot Water ◽  
Apartment Buildings ◽  
Pump Equipment ◽  
Hot Water Supply ◽  
Air Conditioning Systems

Abstract Experimental studies of this article are aimed at solving the problem of reforming the housing and communal services of Russia through rational integration of non-traditional energy sources and secondary energy resources into the energy balance of buildings and structures. An important component of the work was the creation and development of industrial production of reliable competitive heat pump systems of a new generation, cogenerating heat energy and cold in an autonomous mode and providing energy savings of at least 50% due to the combined use of low-potential thermal energy of the soil, the atmospheric air and the exhaust air of ventilation systems for hot water supply and air conditioning systems of apartment buildings.

Development of Heating and Cooling Local Air Conditioning System for Houses

2018 ◽  
Vol 931 ◽  
pp. 920-925
Author(s):  
Zohrab Melikyan ◽  
Naira Egnatosyan ◽  
Siranush Egnatosyan
Keyword(s):  
Air Conditioning ◽  
Point Of View ◽  
Air Conditioner ◽  
Air Conditioning System ◽  
Air Conditioners ◽  
Heating And Cooling ◽  
The Creation ◽  
Air Conditioning Systems

Centralized air conditioning systems are widely used in buildings at present. In these conditioners, the outside air gets required temperature, humidity, purity, and other features, necessary for creating comfort microclimate in inside areas of houses, and by the help of fans and air ducts the processed air moves to all rooms of a building. As a result, the creation and maintenance of comfort conditions in buildings become complicated and expensive activity. From this point of view, it is becoming more expedient to install local air conditioners in each room instead of single central one for the whole building. For this reason new local air conditioner is developed.

DEVELOPMENT OF A METHOD FOR DETERMINING THE LENGTH TUBE EVAPORATORS AND HEAT PUMP CONDENSERS USING ZEOTROPIC MIXTURES OF WORKING AGENTS

2020 ◽  
pp. 66-77
Author(s):  
А. В. Рулев ◽  
Е. Ю. Усачева
Keyword(s):  
Heat Transfer ◽  
Heat Exchange ◽  
Heat Pump ◽  
Air Conditioning ◽  
Liquid Mixture ◽  
Transfer Processes ◽  
Temperature Conditions ◽  
Cost Efficient ◽  
Air Conditioning Systems

Постановка задачи. Необходимо разработать методику определения длины трубных испарителей и конденсаторов тепловых насосов, использующих зеотропные смеси рабочих агентов. Результаты. Приводится описание процессов теплообмена в трубных испарителях и конденсаторах тепловых насосов, использующих в качестве рабочих агентов зеотропные смеси предельных углеводородов, таких как пропан и н-бутан. Указанные смеси полностью озоно-экологически безопасны и наиболее экономичны при подогреве приточного воздуха в системах вентиляции и кондиционирования. Выводы. Разработанная методика позволяет учитывать изменение интенсивности теплообмена и температурных условий в зависимости от непрерывно изменяющихся состава и режимов течения парожидкостной смеси, протекающих в следующей последовательности: расслоенно-пробковый, кольце-волновой и дисперсный. Statement of the problem. It is essential to develop a method for determining the length of tube evaporators and heat pump condensers using zeotropic mixtures working agents. Results. The paper describes heat transfer processes in tube evaporators and heat pump condensers that use zeotropic mixtures of limiting hydrocarbons, such as propane and n-butane, as working agents. These mixtures are completely ozone-friendly and most cost-efficient when heating the supply air in ventilation and air conditioning systems. Conclusions. The developed method allows us to account for changes in the intensity of heat exchange and temperature conditions depending on the continuously changing composition and flow modes of the vapor and liquid mixture, which occur in the following sequence: stratified - cork, ring - wave and dispersed.

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