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Climate Control, 2017
Viewing 1 to 23 of 23
Cool Down Analysis of an HVAC System Using Multi-Zone Cabin Approach
Author(s): Peri, G., Sambandan, S., and Sathish Kumar, S.
Abstract Cool down of a passenger vehicle cabin is a preferred method to test the efficiency of the vehicle HVAC (Heating, Ventilation and Air Conditioning) system. The intended primary objective of a....
A Study on Implementation of Vapour Absorption Air Conditioning System (VAAcS) Using LiBr-H2O in Commercial vehicles
Author(s): William, B., Selvaraj, A., Rammurthy, M., Rajaraman, M. et al.
Abstract The modern day automobile customers’ expectations are sky-high. The automotive manufacturers need to provide sophisticated, cost-effective comfort to stay in this competitive world. Air condi....
Efficiency Improvement by Separation of Vapor and Liquid in Condenser Headers
Author(s): Li, J. and Hrnjak, P.
Abstract This paper introduces the concept of separation of two-phase flow in condenser as a way to improve condenser efficiency. The benefits of vapor-liquid refrigerant separation and the reason why....
Robust 1D Modelling for Automotive HVAC Warmup Prediction Using DFSS Approach
Author(s): Sambandan, S., Valencia, M., and S, S.
Abstract In an automotive air-conditioning (AC) system, the heater system plays a major role during winter condition to provide passenger comforts as well as to clear windshield defogging and defrost.....
Coupling a Passive Sensor Manikin with a Human Thermal Comfort Model to Predict Human Perception in Transient and Asymmetric Environments
Author(s): Hepokoski, M., Curran, A., Gullman, S., and Jacobsson, D.
Abstract Passive sensor (HVAC) manikins have been developed to obtain high-resolution measurements of environmental conditions across a representative human body form. These manikins incorporate numer....
Refrigerant Charge Imbalance in a Mobile Reversible Air Conditioning-Heat Pump System
Author(s): Feng, L. and Hrnjak, P.
Abstract This paper presents the study of refrigerant charge imbalance between A/C (cooling) mode and HP (heating) mode of a mobile reversible system. Sensitivities of cooling and heating capacity and....
A DFSS Approach to Optimize the Second Row Floor Duct Using Parametric Modelling
Author(s): Vasanth, B., Putcha, U., Sathish Kumar, S., nukala, R. et al.
The main function of mobile air conditioning system in a vehicle is to provide the thermal comfort to the occupants sitting inside the vehicle at all environmental conditions. The function of....
R744 Parallel Compression Cycle for Automotive Climate Control
Author(s): He, J., Johnston, B., Dhar, D., and Lohmeyer, L.
The natural refrigerant, R744 (CO2), remains a viable solution to replace the high GWP refrigerant R134a which is to be phased out in light-duty vehicles in EU and US market. In this study, t....
A Rapid Screening Test to Assess Relative Corrosion Performance of Automotive Condensers
Author(s): Rungta, R. and Pandit, N.
Abstract A simple and rapid immersion type corrosion test has been successfully developed that discriminates corrosion performance in condensers from various suppliers and with differing manufacturing....
Comparative Manufacturing and Ownership Cost Estimates for Secondary Loop Mobile Air Conditioning Systems (SL-MACs)
Author(s): Andersen, S., Chowdhury, S., Craig, T., Kapoor, S. et al.
Abstract This paper quantifies and compares the cooling performance and refrigerant and fuel cost savings to automobile manufacturers and owners of secondary-loop mobile air conditioners (SL-MACs) usi....
NVH Challenges with Introduction of New Refrigerant HFO-1234yf
Author(s): Venkatappa, S., Koberstein, M., and Liu, Z.
Abstract The refrigerant transition from HFC-134a to HFO-1234yf has proven to be more challenging on controlling refrigerant flow-induced noises generated from automotive air-conditioning (A/C) system....
Air Conditioning System Performance and Vehicle Fuel Economy Trade-Offs for a Hybrid Electric Vehicle
Author(s): Zhang, Q., Meng, Y., Greiner, C., Soto, C. et al.
Abstract In this paper, the tradeoff relationship between the Air Conditioning (A/C) system performance and vehicle fuel economy for a hybrid electric vehicle during the SC03 drive cycle is presented.....
Optimum Seat Cooling Distribution for Targeted Human Thermal Comfort®
Author(s): Velivelli, A., Guerithault, D., and Stöwe, S.
Abstract Seat cooling and heating strategies have enhanced human thermal comfort in automotive environments. Cooling/heating strategies also need to focus on the distribution of the seat cooling/heati....
The Impact of Increased Air Recirculation on Interior Cabin Air Quality
Author(s): Atkinson, W., Hill, W., and Mathur, G.
Abstract The EPA has issued regulations in the Final Rulemaking for 2017-2025 Light-Duty Vehicle Greenhouse Gas Emission Standards and Corporate Average Fuel Economy Standards (420r12901-3). This docu....
Static Loading Analysis of Third Row Floor Duct System Using Finite Element Method
Author(s): Vasanth, B., Arunachalam, M., Narayana, S., Sathish Kumar, S. et al.
In current scenario, there is an increasing need to have faster product development and achieve the optimum design quickly. In an automobile air conditioning system, the main function of HVAC....
Automotive A/C Servicing – Refrigerant Flushing of a Failed A/C System
Author(s): Lambert, S., Jamo, W., and Kurtz, M.
Abstract The failure of an A/C system often results in the introduction of contaminants to the A/C system. The sources of the contaminants include debris from damaged components and debris from the su....
Effects of Thinner Condenser Technology on Vehicle AC Pull Down Performance
Author(s): Pandit, N.
Abstract The effects of substituting a 12 mm thick subcool on top condenser in place of a 16 mm subcool on bottom condenser are evaluated in a vehicle level AC pull down test. The A to B testing shows....
Influence of Nozzle Divergent Part Length and Throat Diameter on Vortex Control of Initially Subcooled Flashing Flow
Author(s): Zhu, J. and Elbel, S.
Abstract Expansion work recovery by two-phase ejector is known to be beneficial to vapor compression cycle performance. However, one of the biggest challenges with ejector vapor compression cycle is t....
Investigation of a Dual HVAC MAC System with Three Row Ducts Using 1D Modeling
Author(s): Muthusamy, V., Sathish Kumar, S., and Sambandan, S.
Abstract In an automotive air-conditioning (AC) system, upfront prediction of the cabin cool down rate in the initial design stage will help in reducing the overall product development (PD) time. Vehi....
Development of a Model to Predict Build-up of Cabin Carbon Dioxide Concentrations in Automobiles for Indoor Air Quality
Author(s): Mathur, G.
The author has developed a model that can be used to predict build-up of cabin carbon dioxide levels for automobiles based on many variables. There are a number of parameters including number....
Experimentally Validated Effects of Separation of Liquid and Vapor on Performance of Condenser and System
Author(s): Li, J., Feng, L., and Hrnjak, P.
Abstract This paper presents the results of an experimental study to determine the effect of vapor-liquid refrigerant separation in a microchannel condenser of a MAC system. R134a is used as the worki....
Research on the Application of Micro-Channel Evaporator in R134a Roof-Top Bus Air Conditioner
Author(s): Wang, D., Liu, C., and Chen, J.
Abstract This study investigates the cycle performance and potential advantages of the replacement of fin-and-tube evaporator with parallel flow micro-channel evaporator, in R134a roof-top bus air con....
High-Precision Modeling of Heat Exchanger Core on Vehicle Engine Room Airflow Analysis
Author(s): Miura, S. and YASUDA, T.
Abstract In general, CFD analysis with porous media is precise enough to simulate airflow behavior in a heat exchanger core, placed in the vehicle. In a case when the airflow behavior is complex, howe....
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