A Study on the Performance of Drinking Fountain Using CO2 Heat Pump under Different System Pressures

2010 ◽  
Vol 44-47 ◽  
pp. 2433-2437 ◽  
Author(s):  
Yu Lieh Wu ◽  
Yu Dai Shiue ◽  
Kuo Hsiang Chien ◽  
Chiu Li Wang
Keyword(s):  
Carbon Dioxide ◽  
Heat Source ◽  
Heat Pump ◽  
Air Conditioning ◽  
High Performance ◽  
High Efficiency ◽  
Electric Heating ◽  
Alternative Refrigerant ◽  
Saving Effect ◽  
Natural Refrigerant

To avoid continuous damage of ozone layer and deterioration of global warming, many countries have devoted to the development and application of natural refrigerant. Although CO2, an alternative refrigerant in the area of air conditioning is not the best all-temperature refrigerant, it has the lowest operating risk as compared to hydrocarbon (HCs) and ammonia.Traditional drinking fountain provides heat source through secondary energy source - electric heating; however, the heating effect is limited. Since heat pump has a high performance, this study used a carbon dioxide heat pump, which has energy-saving effect and high efficiency, to provide heat source to drinking fountains. It further assembled the drinking fountain system with carbon dioxide heat pump and analyzed its performance.

Spreading of SARS-CoV-2 via Heating, Ventilation, and Air Conditioning Systems—An Overview of Energy Perspective and Potential Solutions

2020 ◽  
Vol 143 (8) ◽  
Author(s):  
Ahmad K. Sleiti ◽  
Samer F. Ahmed ◽  
Saud A. Ghani
Keyword(s):  
Air Conditioning ◽  
High Performance ◽  
Public Perception ◽  
High Efficiency ◽  
Uv Light ◽  
Experimental Studies ◽  
High Energy ◽  
Penalty Cost ◽  
Energy Penalty ◽  
Air Conditioning Systems

Abstract The role of heating, ventilation, and air conditioning systems (HVAC) in spreading SARS-CoV-2 is a complex topic and has not been studied thoroughly. There are some existing strategies and technologies for health and high performance buildings; however, applications to other types of buildings come at large energy penalty: cost; design, regulations and standards changes, and varied public perception. In the present work, different factors and strategies are reviewed and discussed and suggested mitigations and solutions are provided including the required air flowrates with the presence of infectors with and without mask and disinfection techniques including ultraviolet (UV) light. Experimental and numerical research in open literature suggests that the airborne transmission of SARS-CoV-2 is sufficiently likely. However, in situ detailed experimental studies are still needed to understand the different scenarios of the virus spread. Displacement ventilation, underfloor air distribution, chilled beams, radiant ceiling panels, and laminar flow systems have varied effectiveness. High-efficiency particulate arrestance (HEPA) filters and UV light can clean viruses but at high energy cost. Suggested solutions to reduce the infection probability include recommended levels of ventilation and a combination of virus sampling technologies including cyclones, liquid impinger, filters, electrostatic precipitators, and water-based condensation.

Application Study of Newly Developed Turbo Heat Pump for 130 Degrees Celsius Water for an Industrial Process

2011 ◽  
Author(s):  
Shuichi Umezawa ◽  
Haruo Amari ◽  
Hiroyuki Shimada ◽  
Takashi Matsuhisa ◽  
Ryo Fukushima ◽  
...  
Keyword(s):  
Heat Exchanger ◽  
Low Temperature ◽  
Heat Source ◽  
Heat Pump ◽  
High Efficiency ◽  
Industrial Process ◽  
Application Study ◽  
Hot Air ◽  
Heat Demand ◽  
Temperature Heat

This paper reports application study of newly developed turbo heat pump for 130 degrees Celsius (°C) water for an industrial process in an actual factory. The heat pump is characterized by high efficiency and large heat output, by using a state-of-the-art turbo compressor. The heat pump requires a low temperature heat source in order to achieve high efficiency. The heat demand is for several drying furnaces in the factory, which requires producing hot air of 120 °C. The heat exchanger was designed to produce the hot air. Experiments were conducted to confirm the performance of the heat exchanger under a reduced size of the heat exchanger. Low temperature heat sources are from both exhaust gas of the drying furnaces and that of an annealing furnace. The heat exchangers were also designed to recover heat of the exhaust gas from the two types of furnace. A thermal storage tank was prepared for the low temperature heat source, and for adjusting the time difference between the heat demand and the low temperature heat source. The size of the tank was determined by considering the schedule of furnaces operations. As a result of the present study, it was confirmed that the heat pump was able to satisfy the present heat demand while retaining high efficiency. Primary energy consumption and CO2 emission of the heat pump were calculated on the basis of the present results in order to compare them with those of the boilers.

Environmental Impact Evaluation and Economy Analysis of Air-Conditioning Cold and Heat Source Based on TEWI Index

2013 ◽  
Vol 805-806 ◽  
pp. 1551-1557
Author(s):  
Chang Rong Liu ◽  
Han Qing Wang ◽  
Zhi Yong Wang ◽  
Tian Yu Zhang
Keyword(s):  
Energy Consumption ◽  
Environmental Impact ◽  
Heat Source ◽  
Heat Pump ◽  
Air Conditioning ◽  
Fossil Fuels ◽  
Recovery Period ◽  
Water Source ◽  
Hunan Province ◽  
Heat Pump Unit

TEWI (total equivalent warming impact) index, a comparatively scientific method to evaluate the environmental impact of air-conditioning cold and heat source, is introduced. Taking some engineering in Hunan Province for example, the TEWI analysis was performed on the environmental impact assessment of four air-conditioning cold and heat source plans. Also the first investment and energy consumption were analyzed. The results indicate that: water loop heat pump unit, due to investment recovery period with only 2.9 years and carbon emission reduction up to 22.68%, has significant economy and environmental protection, which is followed by water source heat pump; the screw chilled water units plus gas boiler is poor. Gas direct-fired machine has certain economic advantage, but its environmental performance is general. Among four schemes, the proportion of indirect effects of CO2emissions from fossil fuels used to generate energy to operate the equipment throughout its lifetime are all larger, respectively is 95.1%, 95.2%, 100% and 89.9%. It fully showed the importance of developing clean and renewable energy, reducing energy consumption and increasing performance coefficient of refrigeration and air conditioning device.

Design and Experimental of High-Performance Interior PMSM with the Aid of Identical Polarization Embedding

2012 ◽  
Vol 229-231 ◽  
pp. 911-914
Author(s):  
Yue Jun An ◽  
Li Ping Xue ◽  
Zhao Jun Meng ◽  
Li Min Zhou
Keyword(s):  
Energy Saving ◽  
Permanent Magnet ◽  
High Performance ◽  
High Efficiency ◽  
Asynchronous Motor ◽  
Permanent Magnet Synchronous Motor ◽  
Synchronous Motor ◽  
Chaos Optimization ◽  
Production Type ◽  
Saving Effect

This paper design an identical polarization embedding high-efficiency permanent magnet synchronous motor and analysis electromagnetic field distribution of the new structure permanent magnet synchronous motor, as well as optimize the design using modern chaos optimization algorithm based on the invention patent. Carried out analysis of energy-saving effect combination high-performance interior PMSM with the aid of identical polarization embedding in textiles with small batch production type test. The optimize design and experiment show that the new structure motor efficiency and power factor higher than the previous configuration of the asynchronous motor, and with high-efficiency and energy-saving advantages in a very broad power output range at the condition of same load.

Snow Utilization as Cold Heat Source - Advantages and Features

2019 ◽  
Vol 889 ◽  
pp. 549-556
Author(s):  
Seiji Kamimura ◽  
Yoshiomi Ito
Keyword(s):  
Heat Source ◽  
Heat Pump ◽  
Air Temperature ◽  
Temperature Control ◽  
Annual Cost ◽  
Air Conditioning ◽  
Cost Effective ◽  
Shiitake Mushroom ◽  
Pump Unit ◽  
Heat Pump Unit

In the summer of 2014, the air-conditioning performance of four different snow-utilizing facilities in Niigata and Nagano Prefectures in Japan were evaluated. Systems with a snow storeroom, a rice depot and spa resort, showed the advantages of stable and flexible air temperature control with high deodorizing and dedusting effects. The investment will be earned back in less than 10 years. The system with a snow mound, shiitake mushroom greenhouses, showed that the annual cost is cheaper than that of the heat pump unit. A highway lavatory with daily snow delivery was not cost effective.

Economic analysis of heat pump air conditioning system of heat-source tower

2015 ◽  
Vol 32 (4) ◽  
pp. 404 ◽  
Author(s):  
Nianping Li ◽  
Ding Zhang ◽  
Jianlin Cheng ◽  
Zhiming He ◽  
Qi Chen
Keyword(s):  
Heat Source ◽  
Economic Analysis ◽  
Heat Pump ◽  
Air Conditioning ◽  
Air Conditioning System
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