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Use of Partial Recirculation to Limit Build-Up of Cabin Carbon Dioxide Concentrations to Safe Limits per ASHRAE Standard-62

Calsonic Kansei North America Inc.-Gursaran Mathur
  • Technical Paper
  • 2020-01-1245
To be published on 2020-04-14 by SAE International in United States
Carbon dioxide exhaled by occupants remains within the cabin during operation of HVAC unit in recirculation mode. The CO2 inhaled by the occupants goes into their blood stream that negatively affects occupant’s health. ASHRAE Standard-621 specifies the safe levels of carbon dioxide in conditioned space for humans. The CO2 concentration limit per ASHRAE is 700 ppm over ambient conditions on a continuous basis. ASHRAE Standard-62 has an additional requirement for maintaining good air quality within the ambient condition. Per this requirement, we need to introduce a min of 15 cfm/person in the conditioned space to maintain good air quality. Even though this requirement is primarily for elimination the body odors, the author has investigated if this airflow requirement is also sufficient to maintain cabin CO2 concentrations as stated above. The author2 has conducted experimental studies by conducting tests on a vehicle to see if ASHRAE’s additional requirements to maintain good air quality is also sufficient to maintain cabin CO2 concentrations below ASHRAE Standard-62. Detailed results will be presented in the paper. REFERENCES 1. ASHRAE/ANSI, Standard…
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Development of an Air support system for long-distance drive comfort

Hyundai Motor Company-Dongwoo Jeong, Seon Chae Na, Sangdo Park, Sangho Kim, Seungyoung Lee
Hyundai Transys-Inho Lee, Sunghoon Kim
  • Technical Paper
  • 2020-01-0868
To be published on 2020-04-14 by SAE International in United States
Passenger fatigue during long distance driving is greatly influenced by the comfort performance of the seat and is one of the important performance of the seat. In order to satisfy this performance, it is determined by the appropriate contour of the seat and the appropriate pad with sufficient thickness and the frame supporting the pad and coverings. Recently, however, more parts such as ventilation seats and passenger detection sensors have taken up the pad In addition, The height of the vehicle have been lowered to enhance car styling, and battery for electric vehicle applied to the underbody of the vehicle, reducing the package space of seats in the vehicle. These external factors eventually lead to a reduced pad thickness of the seat cushion and exacerbate the most important cushioning in the seat cushion compartments, creating an uncomfortable cushioning problem when driving long distances. To improve the cushion composition of the seat within a limited package, air bladders are applied to the underside of the cushion pad. In addition, the function to support the buttocks using…

System Allows Diabetics to Monitor Blood Sugar Without Drawing Blood

  • Magazine Article
  • TBMG-35790
Published 2020-01-01 by Tech Briefs Media Group in United States

Radar and artificial intelligence (AI) technologies have been combined in a system that detects changes in glucose levels without the need for painful finger pricks. The technology could be a smart watch that continuously monitors glucose.

AI Blood Test Spot Signs of Brain Tumors

  • Magazine Article
  • TBMG-35768
Published 2020-01-01 by Tech Briefs Media Group in United States

Researchers have developed a test that works by detecting chemical clues shed by brain tumors into the blood. They say it could help improve brain tumor survival by making diagnosis quicker and more efficient.

Implantable Bioartificial Kidney Achieves Preclinical Milestone

  • Magazine Article
  • TBMG-35776
Published 2020-01-01 by Tech Briefs Media Group in United States

Scientists successfully implanted a prototype kidney bioreactor containing functional human kidney cells in large animals without significant safety concerns. The device, which is about the size of a deck of cards, did not trigger an immune reaction or cause blood clots, an important milestone on the road to future human trials.

Bioresorbable Patch Offers New Alternative for Arterial Healing

  • Magazine Article
  • TBMG-35632
Published 2019-12-01 by Tech Briefs Media Group in United States

When a patient experiences 70 percent or greater stenosis in the carotid artery — a condition that can cause lack of cerebral blood flow, stroke, and in some cases, death — surgeons perform a procedure known as carotid endarterectomy (CEA) to remove the plaque causing the artery stenosis.1,2 The procedure consists of a longitudinal incision made from the common to the internal carotid artery, allowing for removal of the plaque that deposits in the bifurcation.

A Strip You Can Rely On: Tips for Designing Blood Glucose Test Strips

  • Magazine Article
  • TBMG-35335
Published 2019-10-01 by Tech Briefs Media Group in United States

When it comes to diabetes management, accurate blood glucose readings are paramount. And when it comes to generating accurate readings, the quality of the test strip is dependent upon the materials used in its design — each layer has to be able to perform its function without interference from other layers or external contamination.

Microfluidics Device Helps Diagnose Sepsis

  • Magazine Article
  • TBMG-35345
Published 2019-10-01 by Tech Briefs Media Group in United States

A novel sensor could dramatically accelerate the process of diagnosing sepsis, a leading cause of death in U.S. hospitals that kills nearly 250,000 patients annually. To diagnose sepsis, doctors traditionally rely on various diagnostic tools, including vital signs, blood tests, and other imaging and lab tests.

Portable Electrochemical Sensing System

  • Magazine Article
  • TBMG-35141
Published 2019-09-01 by Tech Briefs Media Group in United States

An electrochemical sensing system that significantly improves the ability to rapidly and accurately detect heavy metals in biological and environmental samples was developed. Using a simple blood sample from a finger prick, the system identifies and eliminates exposure to toxic metals such as lead. These dangerous elements continue to pose a significant health concern, especially to children.

Cancer Lab-on-a-Chip Enables Personalized Treatment

  • Magazine Article
  • TBMG-35087
Published 2019-09-01 by Tech Briefs Media Group in United States

A new generation of pathology labs mounted on chips is set to revolutionize the detection and treatment of cancer by using devices as thin as a human hair to analyze bodily fluids. The technology, known as microfluidics, promises inexpensive, portable devices that not only could enable widespread screening for early signs of cancer but also could help to develop personalized treatments for patients.