Development of Two-Stage Variable Displacement Compressor for Automotive Air Conditioner

1985 ◽  
Author(s):  
Yoji Nishimura ◽  
Masashi Takagi ◽  
Hisao Kobayashi
Keyword(s):  
Air Conditioner ◽  
Two Stage ◽  
Variable Displacement

scholarly journals Application of heat pump combined two-stage desiccant wheel fresh air system of residential buildings in mixed climate zone

2019 ◽  
Vol 111 ◽  
pp. 01009
Author(s):  
Shaochen Tian ◽  
Xing Su ◽  
Xu Zhang
Keyword(s):  
Heat Pump ◽  
Air Conditioning ◽  
Residential Buildings ◽  
Dew Point ◽  
Air Conditioner ◽  
Operation Performance ◽  
Two Stage ◽  
Climate Zone ◽  
Desiccant Wheel ◽  
Air System

The building requires dehumidification for a long period of time in mixed climate zone of China. As a conventional method for dehumidification, vapor compression systems remove the water vapor by cooling the process air below dew point. This system consumes a lot of energy for reheating the air to meet the requirement of supply air temperature. A heat pump combined with two-stage desiccant wheel (TSDW&HP) is proposed as an air conditioning and dehumidification system in this study. The operation performance of proposed system applied in a hypothetical residence with 3 residents was investigated and simulated by using TRNSYS software. The operation modes of the system are discussed for different scenarios of season and outdoor air humidity ratio. In dehumidification season, fresh air deals with all of the latent load. In air conditioning season, fresh air deals with all of the moisture load with part of the cooling load. When evaporation temperature of HP is reduced and more moisture load is processed by evaporator in air conditioning season, there is a balance point between the performance of DWs and heat pump. The energy consumption of TSDW&HP fresh air system was compared with a conventional fresh air conditioner during dehumidification season and air conditioning season. It was found that the energy-saving potential of this system is 27.3% compared with conventional air conditioner.

PV Operated HVAC for Southwest States

Solar Energy ◽  
2006 ◽  
Author(s):  
Joseph McCabe
Keyword(s):  
Direct Current ◽  
Air Conditioning ◽  
High Efficiency ◽  
Air Conditioner ◽  
Hvac System ◽  
Energy Usage ◽  
Pv System ◽  
Two Stage ◽  
System A ◽  
Evaporative Cooler

This report analyzes energy usage and associated utility capacity requirements for compressor based air-conditioning compared to evaporative cooling supplied by electricity from photovoltaics (PV). Two novel scenarios are presented, two stage evaporative coolers with grid tied PV, and two stage evaporated coolers supplied with direct current (DC) electricity from PV. The two scenarios are complimentary; where a grid tied system can tap DC for air-conditioning purposes (see Figure 1). 8% PV system gains can be achieved by eliminating the inverter for powering such a DC heating, ventilating and air-conditioning (HVAC) system. A PV system directly coupled to high efficiency evaporative cooler can remove the air-conditioner peak demand from a utilities load profile. Typical cities energy comparisons are presented. Incentive and public goods programs are not necessarily designed for this optimized, direct utilization of DC approach.

Development of a Two-Stage Variable Displacement Vane Oil Pump

2012 ◽  
Author(s):  
Taguchi Arata ◽  
Nicola Novi ◽  
Kenji Ariga ◽  
Akira Yamashita ◽  
Giacomo Armenio
Keyword(s):  
Two Stage ◽  
Oil Pump ◽  
Variable Displacement

scholarly journals Characteristics of Room Air Conditioner with Two-Stage Compression and Gas Injection Cycle(Thermal Engineering)

2009 ◽  
Vol 75 (753) ◽  
pp. 1157-1167
Author(s):  
Atsushi KUBOTA ◽  
Masayuki NONAKA ◽  
Yoshinori IIZUKA ◽  
Kenichi DAIGO ◽  
Hisashi DAISAKA ◽  
...  
Keyword(s):  
Gas Injection ◽  
Thermal Engineering ◽  
Air Conditioner ◽  
Two Stage ◽  
Injection Cycle

Two-stage self-seeding method for preparation of single crystals of poly(phenylene sulfide)

1989 ◽  
Vol 47 ◽  
pp. 368-369
Author(s):  
Sengshiu Chung ◽  
Peggy Cebe
Keyword(s):  
Single Crystals ◽  
High Performance ◽  
Dilute Solution ◽  
Two Stage ◽  
Annealing Behavior ◽  
High Performance Polymers ◽  
Seeding Method ◽  
Phenylene Sulfide

We are studying the crystallization and annealing behavior of high performance polymers, like poly(p-pheny1ene sulfide) PPS, and poly-(etheretherketone), PEEK. Our purpose is to determine whether PPS, which is similar in many ways to PEEK, undergoes reorganization during annealing. In an effort to address the issue of reorganization, we are studying solution grown single crystals of PPS as model materials.Observation of solution grown PPS crystals has been reported. Even from dilute solution, embrionic spherulites and aggregates were formed. We observe that these morphologies result when solutions containing uncrystallized polymer are cooled. To obtain samples of uniform single crystals, we have used two-stage self seeding and solution replacement techniques.

364: Two stage "Progressive Elongation of Spermatic Cord" Technique in Criptorchidism with very short Spermatic Vessels

2007 ◽  
Vol 177 (4S) ◽  
pp. 121-121
Author(s):  
Antonio Dessanti ◽  
Diego Falchetti ◽  
Marco Iannuccelli ◽  
Susanna Milianti ◽  
Gian P. Strusi ◽  
...  
Keyword(s):  
Spermatic Cord ◽  
Two Stage

360: A Contemporary Analysis of Two-Stage Hypospadias Repair

2007 ◽  
Vol 177 (4S) ◽  
pp. 120-120
Author(s):  
Pamela I. Ellsworth ◽  
Anthony Caldamone
Keyword(s):  
Hypospadias Repair ◽  
Two Stage
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