Results 81 to 90 of about 8,063 (215)

Defrosting Characteristics of Refrigeration, Heating, and Hot Water Combined Air-conditioning System

Zhileng xuebao, 2020
Frost on the surface of an outdoor heat exchanger will seriously affect the operating performance and safety factor of a refrigeration-, heating-, and hot-water combined air-conditioning system when it is operating in winter.
Pei Xiangxiang, Guo Yabin, Li Yuduo, Zhang Shoubing, Li Ruixin, Yang Jianzhong   +5 more
doaj  

Effect of Refrigerant Charge on the Performance of Air-source Heat Pump Water Heater

Zhileng xuebao, 2018
In this paper, the effects of a refrigerant charge on the system performance of a heat pump water heater and the regulating characteristics of the electronic expansion valve were studied experimentally.
Yuan Zhaoyang, Tao Leren, Yu Zhongyang, Gu Zhipan   +3 more
doaj  

Variation in Carbon Content During the Melting of γ-TiAl in a Graphite Crucible

Crystals
Liquid γ-TiAl alloy was prepared by vacuum induction melting within graphite crucibles, then cast using a centrifugal technique. In this process, the degree of superheat (ΔT)—defined as the temperature above the melting point—was carefully controlled ...
Byungil Kang, Taekyu Ha, Seul Lee, Youngjig Kim   +3 more
doaj   +1 more source

Collaborative Control of the Frequency and Opening of Electronic Expansion Valve in Variable Refrigerant Flow Refrigeration System

Zhileng xuebao, 2019
The hysteresis or overshoot in a variable refrigerant flow (VRF) system control is studied. This study considers a variable-frequency rolling rotor refrigeration system as the research object.
He Jun, Tao Leren, Hu Pengrong
doaj  

Difficulties in Defining the Degree of Superheat in Flash Boiling Liquid Nitrogen Sprays

International Conference on Liquid Atomization and Spray Systems (ICLASS), 2021
Andreas Kronenburg, Jan Wilhelm Gärtner, Michael Oschwald, Andreas Rees   +3 more
openaire   +2 more sources

Effect of Soft Reduction and Cast Speed on Macrostructure and Centre C Segregation of 42CrMo Steel Φ195 mm Bar Rolled from 410 mm x 530 mm Cast Bloom

Teshugang, 2021
The effects of soft reduction (0 ~ 8 mm) and casting speed (0.42 ~ 0.49 m/min) of cast bloom on macrostructure and segregation of 42CrMo steel Φ195 mm rolled product are tested. The results show at present process condition that when the superheat degree
张越, 吕泽安, 马建祎, 钟骞, 王占忠, 彭峰   +5 more
doaj  

Bearing tester data compilation, analysis and reporting and bearing math modeling, volume 1 [PDF]

Thermal and mechanical models of high speed angular contact ball bearings operating in LOX and LN2 were developed and verified with limited test data in an effort to further understand the parameters that determine or effect the SSME turbopump bearing ...
Marshall, D. D., Montgomery, E. E., New, L. S., Stone, M. A., Tiller, B. K.   +4 more
core   +1 more source

Visualization of liquid ammonia spray using multi-hole injector

Nihon Kikai Gakkai ronbunshu
To reduce carbon dioxide emissions, carbon-free ammonia is being investigated as an alternative fuel for internal combustion engines. When injected into a low-pressure environment, liquid ammonia undergoes rapid vaporization (flash boiling) due to its ...
Hideaki MASUI, Mitsuaki OHTOMO, Hiroshi MIYAGAWA   +2 more
doaj   +1 more source

A Rotary Compressor-Accumulator Component Simulation Model in Consideration of (±) Suction Gas Superheat Degrees

, 2012
On the basis of the classic ARI compressor model, the mass flow-rate and input power were corrected with the level of suction gas superheat, especially the superheat degrees below zero. refrigerant dissolved in the oil pool, at the discharge pressure and the oil temperature, was calculated by means of the estimation model for refrigerant/oil mixture ...
Ye, Ke-jia, Tao, Hong, Yang, Jun, Liu, Chun-hui   +3 more
openaire   +2 more sources

Forced-flow once-through boilers [PDF]

A compilation and review of NASA-sponsored research on boilers for use in spacecraft electrical power generation systems is presented. Emphasis is on the heat-transfer and fluid-flow problems.
Gray, V. H., Gutierrez, O. A., Stone, J. R.   +2 more
core   +1 more source