Browsing by Author "Fisher, Daniel"
Now showing items 1-16 of 16
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Closed cycle propulsion for small unmanned aircraft
Hays, Thomas Chadwick (2015-07)This study evaluates the merit of closed cycle propulsion systems for use in unmanned systems. The complexity and added weight of closed cycle engines is offset by benefits in high altitude performance, operation in polluted ... -
Design and Construction of a New Psychrometric Chamber
Lifferth, Spencer Owen (Oklahoma State University, 2009-05-01)The complete design and construction of a psychrometric chamber resulted in the following conclusions:* Chamber dimensions of 25' x 40' x 20* Temperature rage of -40 to130�F (-40 to 54 �C) and 10 to 90% relative humidity ... -
Development of a Detailed Heat Pump Simulation Controls Testbed
Spitler, Rachel (2019-07)In order to increase energy efficiency, it is desirable to reduce power consumption of HVAC systems. One way to reduce power consumption is through careful control of system components. To this end, this work covers the ... -
Development, Implementation and Validation of a Non-dimensional Pump Model in Energyplus
Phalak, Kaustubh P. (Oklahoma State University, 2011-12-01)In HVAC plant simulation software, a pump model is required to carry out pressure based simulation, which will govern flow rate in system and predict accurate power consumption. To implement a pump model in EnergyPlus, ... -
Empirical indicated loss analysis of a semi-hermetic light-commercial spool compressor
Yarborough, Seth J. (2021-05)An analysis of the indicated losses is presented for a semi-hermetic, light-commercial, prototype, spool compressor. The spool compressor prototype was instrumented with five high-speed pressure sensors, three in the ... -
Experimental and Theoretical Study of Water Side Fouling Thermal Performance of Refrigerant to Water Condensers
Wu, Xiaoxiao (Oklahoma State University, 2013-12-01)Brazed plate heat exchanges (BPHEs) and tube-in-tube heat exchangers (TTHEs) are commonly used in the refrigeration, air conditioning, and food industry as refrigerant-to-water condensers, in which the refrigerant rejects ... -
Experimental Measurement and Analysis of Surface Water Heat Exchangers
Hansen, Garrett Michael (Oklahoma State University, 2011-12-01)When looking at the heat exchanger of a surface water heat pump (SWHP) system the material of choice these days is high density polyethylene (HDPE). HDPE coils provide high corrosion resistance and minimal impact on the ... -
Improved hydronic loop system solution algorithm with a zone-coupled horizontal ground heat exchanger model for whole building energy simulation
Lee, Edwin Scott (2013-05)Whole building energy simulation is a simulation platform which includes any number of aspects of a building. These tools are generally capable of simulating zones, air systems, hydronic systems, electric generation systems, ... -
Investigation of Pumping and Piping System Design for Commercial Ground Source Heat Pumps
Rhoda, Benjamin (Oklahoma State University, 2013-12-01)This study focused on the simulation of previously researched design methodologies and pumping strategies and compared them in detailed simulations to see the impacts of certain designs on the performance of the pumping ... -
Modeling of standing column wells in ground source heat pump systems
Deng, Zheng (2004-12)The need for alternative low-cost energy sources has given rise to the development of ground source heat pump systems for residential and commercial heating and cooling applications. Standing column wells can be used as ... -
Modeling, Verification and Optimization of Hybrid Ground Source Heat Pump Systems in Energyplus
Padhmanabhan, Sankaranarayanan (Oklahoma State University, 2005-05-01)Hybrid Ground Source Heat Pump system simulation capability was added to EnergyPlus. Program was modified to handle multi-year simulation capability. New supervisory controls were added and a plate heat exchanger model ... -
Modelling Oil Retention, Pressure Drop, and Heat Transfer of Refrigerant-oil Mixtures in a Microchannel Condenser
Harges, Ellyn (2016-12-01)Microchannel heat exchangers have improved heat transfer capabilities as well as reduced charge when compared to conventional fin and tube heat exchangers. These characteristics led to their increasing application in ... -
Performance and Capacity Comparison of Two New Lgwp Refrigerants Alternative to R410a in Residential Air Conditioning Applications
Biswas, Auvi (Oklahoma State University, 2012-12-01)This thesis presents a ground breaking study on Low Global Warming Potential (LGWP) developmental refrigerants. An R410A 17.6 kW (5 ton) heat pump split unit commercially available off-the-shelf for US ducted HVAC applications, ... -
Study of frost growth on heat exchangers used as outdoor coils in air source heat pump systems
Padhmanabhan, Sankaranarayanan (2011-05)Scope and Method of Study: During winter heating operation, the outdoor coil of a heat pump acts as an evaporator and when the ambient temperature is near freezing, the moisture in the atmospheric air freezes on the coil ... -
Study of Low Global Warming Potential Refrigerants in Heat Pump System for Residential Applications
Barve, Atharva (Oklahoma State University, 2012-12-01)R410A is one of the major refrigerants used for air conditioning and heat pump systems in residential applications. It has zero ODP but its GWP is about 2,000. In China and Japan, refrigerant R32 (GWP = 675, zero ODP) has ... -
Thermal performance comparison between microchannel and round tube heat exchangers
Ozdemir, Ozkan Emre (Oklahoma State University, 2009-07-01)Alternative round tube profiles to straight microchannel (SMC) tube geometry was explored by gradually applying the microchannel features to fin and tube type heat exchangers. First, previous experimental and computational ...