Centrifugal turbo chiller using water as refrigerant and lubricant

2020 ◽  
pp. 095440892093819
Author(s):  
Tadayoshi Shoyama ◽  
Bunki Kawano ◽  
Takeshi Ogata ◽  
Masaru Matsui ◽  
Masato Furukawa ◽  
...  
Keyword(s):  
Heat Pump ◽  
High Speed ◽  
Pressure Ratio ◽  
Control Valve ◽  
Cooling Capacity ◽  
Flow Control Valve ◽  
Pump System ◽  
Heat Pump System ◽  
High Pressure Ratio ◽  
Turbo Compressor

Water refrigerant heat pump system with a water vapour turbo compressor is developed. Water (R718) is an ideal refrigerant that is considered perfectly environment friendly. Although water refrigerant heat pump is studied extensively, the development of turbo compressors of high pressure ratio is still a technical challenge, in terms of both aerodynamics of the impellers and high-speed rotordynamics. In this study, the high-speed rotor is supported by journal bearings lubricated with water refrigerant. Additionally, other system components such as sprayed direct intercooler heat exchanger and anti-cavitation flow control valve have to be designed and developed with the new requirements as well. An experimental test rig of closed-loop heat pump is constructed which achieves the cooling capacity of 100 kW on the rated condition with COP = 5. The experimental results and the experienced challenges and their undertaken solutions are discussed in terms of the efficiency and the vibrations of the turbo compressor and the heat pump system.

scholarly journals Technical requirements analysis of integrated paralleled-loop exhaust air heat pump system applied to ultra-low energy building in different climatic regions of China

2021 ◽  
pp. 353-353
Author(s):  
Xiaoya Ji ◽  
Guoyuan Ma ◽  
Feng Zhou ◽  
Lei Wang ◽  
Guoqiang Wu ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Heat Pump ◽  
Cooling Capacity ◽  
Low Energy ◽  
Heating Season ◽  
Pump System ◽  
Heat Pump System ◽  
Technical Parameters ◽  
Climatic Regions ◽  
Technical Requirements

Based on the simulation results of the typical rural ultra-low energy building (ULEB) in 5 different climatic regions of China, three indicative technical parameters for paralleled-loop exhaust air heat pump (PEAHP) R&D- which are nominal heating/cooling capacity, maximum required fresh air to return air ratio (MFRR) and system energy efficiency grades- were calculated and summarized according to the demand of indoor thermal comforts by using statistic method. The nominal heating/cooling capacities were determined according to the peak loads, which are 6.84/2.01kW, 5/2.96 kW, 3.9/4.6 kW, 3.08/5.02 kW and 3.4/0.46 kW in the ULEB of Harbin, Beijing, Shanghai, Guangzhou and Kunming respectively. To ensure both thermal comforts and energy conservation, during the heating season, full fresh air supply is suggested in Beijing and the 1:0.5 MFRR is suggested in Harbin, Shanghai, Guangzhou and Kunming. During the cooling season, the 1:5 MFRR is suggested in Shanghai and Guangzhou, the 1:3, 1:1.5 and 1:0.5 MFRR are suggested in Harbin, Beijing and Kunming respectively. The PEAHP energy efficiency grades 1~5 are 7.92~11.7, 7.58~11.5, 7.5~11.35, 6.12~9.27 and 4.64~7.03 during the heating season of Harbin, Beijing, Shanghai, Guangzhou and Kunming respectively, and are 2.33~3.54, 3.93~5.96, 4.61~6.98, 4.62~6.99 and 2.04~3.1 for the cooling season respectively.

Design of a Centrifugal Turbo Compressor With the Working Fluid Water for the Operation in a Hybrid Sorption/Compression Heat Pump Cycle

2016 ◽  
Author(s):  
Thomas Eckert ◽  
Leo Dostal ◽  
Martin Helm ◽  
Christian Schweigler
Keyword(s):  
Heat Pump ◽  
High Speed ◽  
Fluid Dynamic ◽  
Pressure Ratio ◽  
Lithium Bromide ◽  
High Volume ◽  
Heat Pumps ◽  
Operating Conditions ◽  
Working Fluid ◽  
Turbo Compressor

In various applications the use of sorption chillers and heat pumps is limited by the available temperature level of the driving heat source or the heat sink for export of reject heat. These constraints can be overcome by integrating an efficient high-speed transonic turbo compressor into the internal cycle of a thermally driven water/lithium bromide absorption heat pump. The operation in a hybrid heat pump with the refrigerant water implies specific challenges for the design of the compressor: Saturation pressures in the sub-atmospheric range, low vapor density, high volume flows and a targeted pressure ratio of 3 result in high impeller tip speeds with machine Mach numbers close to 1. Here the authors present a theoretical design study based on a numerical simulation of a centrifugal compressor, targeted at the given operating conditions. Evaluation of the results is conducted with regard to the relevant thermodynamic and fluid mechanic figures. The optimization of the impeller geometry comprises both fluid dynamic behavior and structural stability.

scholarly journals Experimental analysis of a continuous operating ground source heat pump system in Wuhan, China

2018 ◽  
Vol 22 (Suppl. 2) ◽  
pp. 491-496
Author(s):  
Qianjun Mao ◽  
Yufeng Chen ◽  
Suisui Jin ◽  
Lei Shi ◽  
Liangli Xiao
Keyword(s):  
Heat Pump ◽  
Atmospheric Temperature ◽  
Cooling Capacity ◽  
Coefficient Of Performance ◽  
Testing Time ◽  
Ground Source Heat Pump ◽  
Pump System ◽  
Heat Pump System ◽  
Average Value ◽  
Ground Source

Coefficient of performance of air conditioning system is the ratio of cooling capacity and power consumption, and also is an important parameter to characterize the performance of the system. Based on an actual ground source heat pump system in Wuhan, China, this paper calculated the coefficient of performance of the system under long-term continuous cooling operation and then evaluated the performance of the system through experiment. The continuous testing time ranged from June 1, 2017, to June 15, 2017, and the outside air temperature ranged from 21?C to 32?C during the testing progress. The experimental results show that the coefficient of performance of the system changes non-linearly with time, and varies greatly with the atmospheric temperature. The results also show that the coefficient of performances average value of the system is about 3.3, and the system has good performance under refrigeration conditions. This paper helps to understand the changes in the distribution characteristics of the coefficient of performance of the ground source heat pump system and promote the wide application of the ground source heat pump system.

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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