Comparisons of Thermodynamic Performance of Three Types of Air-Conditioning Systems Under Ideal Processing Procedure

2020 ◽  
Vol 13 (2) ◽  
Author(s):  
Donggen Peng ◽  
Danting Luo ◽  
Yuting Fu
Keyword(s):  
Control System ◽  
Relative Humidity ◽  
Heat Pump ◽  
Hybrid System ◽  
Low Grade ◽  
Independent Control ◽  
Pump System ◽  
Heat Pump System ◽  
Study Results ◽  
The Ideal

Abstract As the substitution of the traditional heat pump system, the heat pump driven liquid dehumidification hybrid system and the temperature-humidity independent control system have great application potentials. In this paper, the ideal reversible processes of the three types of systems are built theoretically with their mathematical models, in order to compare their maximum coefficients of performance COPs. The results show that the COP1 of the ideal heat pump driven liquid dehumidification hybrid system is the maximum and the COP2 of the temperature-humidity independent control system is the minimum with the COP3 of the heat pump system falling between both. The COP1 increases by 100% with an increase in the indoor design temperature and relative humidity while the COP1 decreases with the increase in the ambient temperature and relative humidity. The COP2 of the temperature-humidity independent control system can be affected more significantly by supply air temperature difference and angle scale. In an ideal heat pump system, low-grade heat source utilized to reheat the processed air is a superior choice. The study results in this paper have guiding significance for the selection of three types of systems in practical applications.

scholarly journals Development and verification of control system for heat recovery ground source heat pump system

2018 ◽  
Author(s):  
Takao Katsura ◽  
Yutaka Shoji ◽  
Yoshiki Miyashita ◽  
Katsunori Nagano ◽  
Yasushi Nakamura
Keyword(s):  
Control System ◽  
Heat Pump ◽  
Heat Recovery ◽  
Ground Source Heat Pump ◽  
Pump System ◽  
Heat Pump System ◽  
Ground Source

scholarly journals Performance Assessment of a Hybrid Solar-Geothermal Air Conditioning System for Residential Application: Energy, Exergy, and Sustainability Analysis

2016 ◽  
Vol 2016 ◽  
pp. 1-13 ◽  
Author(s):  
Yasser Abbasi ◽  
Ehsan Baniasadi ◽  
Hossein Ahmadikia
Keyword(s):  
Heat Pump ◽  
Hybrid System ◽  
Residential Building ◽  
Photovoltaic System ◽  
Exergy Destruction ◽  
Pv System ◽  
Geothermal Heat ◽  
Pump System ◽  
Heat Pump System ◽  
Ground Source

This paper investigates the performance of a ground source heat pump that is coupled with a photovoltaic system to provide cooling and heating demands of a zero-energy residential building. Exergy and sustainability analyses have been conducted to evaluate the exergy destruction rate and SI of different compartments of the hybrid system. The effects of monthly thermal load variations on the performance of the hybrid system are investigated. The hybrid system consists of a vertical ground source heat exchanger, rooftop photovoltaic panels, and a heat pump cycle. Exergetic efficiency of the solar-geothermal heat pump system does not exceed 10 percent, and most exergy destruction takes place in photovoltaic panel, condenser, and evaporator. Although SI of PV system remains constant during a year, SI of GSHP varies depending on cooling and heating mode. The results also show that utilization of this hybrid system can reduce CO2emissions by almost 70 tons per year.

scholarly journals THE HEAT PUMP SYSTEM FOR VENTILATION AND AIR CONDITIONING INSIDE THE PRODUCTION AREA WITH AN EXCESSIVE INTERNAL MOISTURE GENERATION

2020 ◽  
Vol 17 (2) ◽  
pp. 78-86
Author(s):  
M.K. Bezrodny ◽  
Keyword(s):  
Energy Efficiency ◽  
Relative Humidity ◽  
Heat Pump ◽  
Air Conditioning ◽  
Warm Season ◽  
Pump System ◽  
Heat Pump System ◽  
Environment Temperature ◽  
Production Area ◽  
Continental Climate

The paper studies application feasibility and energy efficiency of the ventilation and air conditioning heat pump system for maintaining comfort conditions inside the production area with an excessive internal moisture generation during the warm season. In this regard, a thermodynamic analysis of a heat pump system with a partial exhaust air recirculation and a variable ratio of fresh outside air was carried out. Numerical analysis was then done to estimate the influence of changes in the environment temperature and relative humidity and the characteristics of the ventilation and air conditioning object on the system parameters. This allowed to determine potential capabilities of this system to maintain comfortable conditions in the production area. It was also shown that the required additional cooling of the supply air at the entrance to the premise for air conditioning demands can be determined by a simple coefficient and its calculation method is provided in the article. The heat pump system of temperature and humidity maintenance has the highest energy efficiency in the zone of relatively low environment temperatures and largely depends on the relative humidity of the outside air. This suggests that the studied system is suitable for application in countries with temperate continental climate.

Recent Researches on Steam Generation Heat Pump System

2017 ◽  
Vol 25 (04) ◽  
pp. 1730005 ◽  
Author(s):  
Dae Hoon Kang ◽  
Sun-Ik Na ◽  
Min Soo Kim
Keyword(s):  
Heat Pump ◽  
Waste Heat ◽  
Low Grade ◽  
Steam Generation ◽  
Pump System ◽  
Heat Pump System ◽  
Industrial Sites ◽  
Higher Temperature ◽  
Low Grade Heat ◽  
High Temperature Heat Pump

This paper reviews the latest researches on steam generation heat pump (SGHP) to cover diverse technologies to enhance the performance depending on its applications. High temperature heat pump that can produce steam was reviewed first, and SGHP which recovers waste heat from low grade heat source (evaporator) was outlined. Conventional waste heat recovery from many industrial sites was reviewed, and SGHP to produce higher temperature steam by re-compression after heat sink (condenser) was discussed.

Testing of a Condensation-type Heat Pump System for Low-temperature Drying Applications

2014 ◽  
Vol 10 (3) ◽  
pp. 521-531 ◽  
Author(s):  
Mustafa Aktaş ◽  
İlhan Ceylan ◽  
Ali Etem Gürel
Keyword(s):  
Relative Humidity ◽  
Heat Pump ◽  
Technical Specification ◽  
Volumetric Flow Rate ◽  
Water Source ◽  
Coefficient Of Performance ◽  
Pump System ◽  
Heat Pump System ◽  
Air Temperatures ◽  
Different Temperatures

Abstract A closed-type water source heat pump dryer integrated with a drying programme (DP) was designed and tested. The DP was developed using psychometric conditions of desired drying air and thermodynamic balance of heat pump. A drying algorithm was developed according to the technical specification of the dryer. Drying air temperature, relative humidity and drying air volumetric flow rate were entered from a programmable logic controller (PLC) screen. In this study, the drying of mint leaves was examined. Mint leaves were dried at different temperatures (35°C, 40°C and 45°C) and at different volumetric flow rates 300 m3/h for a velocity of 0.75 m/s and 600 m3/h for a velocity of 1.5 m/s in the PLC-controlled heat pump dryer. The relative humidity of the drying air entering the dryer chamber was kept between 13.88% and 6.81% and the two air dampers were controlled according to predetermined value. The coefficient of performance ($$\rm CO{\rm P_{{\rm{hp}}}}$$) values obtained were between 3.81 and 2.29. The specific moisture extraction rate for the whole system ($$\rm SME{\rm R_{{\rm{ws}}}}$$) was between the 0.034 and 0.044 kg/kWh. The drying air temperatures were controlled with an accuracy of ±0.41°C to ±0.76°C depending on the mode of operation.

3 kW Class Displacer Type Stirling Engine for Heat Pump System

1987 ◽  
Author(s):  
T. Nomaguchi ◽  
T. Suganami ◽  
M. Fujiwara ◽  
M. Sakai ◽  
T. Koda ◽  
...  
Keyword(s):  
Heat Pump ◽  
Stirling Engine ◽  
Pump System ◽  
Heat Pump System

DETERMINING THE PROFITABILITY OF GREENHOUSE ELECTROTECHNOLOGIES: A MODELING APPROACH

HortScience ◽  
1994 ◽  
Vol 29 (4) ◽  
pp. 249a-249
Author(s):  
Eric A. Lavoie ◽  
Damien de Halleux ◽  
André Gosselin ◽  
Jean-Claude Dufour
Keyword(s):  
Energy Consumption ◽  
Heat Pump ◽  
Water System ◽  
Heat Pumps ◽  
Hot Water ◽  
Pump System ◽  
Heat Pump System ◽  
Artificial Lighting ◽  
Hot Air ◽  
Marketable Fruit

The main objective of this research was to produce a simulated model that permitted the evaluation of operating costs of commercial greenhouse tomato growers with respect to heating methods (hot air, hot water, radiant and heat pumps) and the use of artificial lighting for 1991 and 1992. This research showed that the main factors that negatively influence profitability were energy consumption during cold periods and the price of tomatoes during the summer season. The conventional hot water system consumed less energy than the heat pump system and produced marketable fruit yields similar to those from the heat pump system. The hot water system was generally more profitable in regards to energy consumption and productivity. Moreover, investment costs were less; therefore, this system gives best overall financial savings. As for radiant and hot air systems, their overall financial status falls between that of the hot water system and the heat pump. The radiant system proved to be more energy efficient that the hot air system, but the latter produced a higher marketable fruit yield over the 2-year study.

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