Browsing OSU Theses by Author "Bach, Christian"
Now showing items 1-12 of 12
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Control and commissioning of a hot-gas bypass compressor load stand for testing light-commercial compressors using low-GWP refrigerants
Singleton, Jake M. (2020-07)As a result of changing efficiency standards for HVAC&R equipment, hydrofluorocarbon refrigerants such as R134a and R410A are in the process of being phased out because of their high Global Warming Potential (GWP). Many ... -
Design and construction of a hydronic conditioning loop for a psychrometric testing facility
Franke, John P. (2019-12)Heat exchanger effectiveness is a major contributor to overall system performance, yet heat exchangers are often the least understood component of the cycle. The major contributing factor to the current gap in heat exchanger ... -
Design and Construction of a Psychrometric Testing Facility for Commercial Scale Heat Exchanger Coils
Kincheloe, Mason C. (2019-07)Heat exchanger coils are used to provide heating and cooling in heating, ventilation, air conditioning and refrigeration (HVAC&R) equipment. Testing of coils is necessary to evaluate how design changes, such as refrigerant ... -
Design, development, and validation of a low-cost measurement system for residential ground source heat pump systems
Brinkman, Eric M. (2019-12)There is still relatively little data available to properly analyze the performance of Ground Source Heat Pump (GSHP) systems in residential applications. While commercial-grade instrumentation is available, it is often ... -
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 of a Light-Commercial Compressor Load Stand to Measure Compressor Performance Using Low-GWP Refrigerants
Schmidt, Drew D. (2018-12-01)Popular hydrofluorocarbon refrigerants such as R134a and R410A are in the process of being phased out due to the high Global Warming Potential (GWP) of these fluids. A large variety of low-GWP refrigerants are being ... -
Development of a Load-based Method of Test for Light Commercial Unitary Hvac
Perez Paez, Pedro Pablo (2015-12-01)Packaged unitary HVAC equipment and systems are factory-made assemblies that often provide heating and cooling to buildings all year round. In the commercial sector only, roughly 60% of the commercial building floor space ... -
Development of a Test Facility and Preliminary Testing of Flow Boiling Heat Transfer of R410a Refrigerant with Al2o3 Nanolubricants
Wong, Thiam (2015-12-01)In vapor compression cycles, a small portion of the oil circulates with the refrigerant throughout the system components, while most of the oil stays in the compressors. In heat exchangers, the lubricant in excess penalizes ... -
Effect of operational parameters and inlet duct design on ECM fan performance of a push-through residential air handling unit
Hossain, Md Yeam (2019-12)The current trend in HVAC industry is to use increased air flowrate to increase the air conditioners' efficiency compared to when testing standards were originally developed. Manufacturers tend to achieve this increased ... -
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 ... -
Numerical Investigation of Air Mixer Performance for HVAC Testing Applications
Ahmed, Mansoor (2019-05-01)The ever-increasing energy demand is one of the biggest challenges of the design processes in heating, ventilation, and air-conditioning (HVAC) systems. Accurate performance measurements of equipment in the laboratory ... -
Oil Retention and Its Effects on Pressure Drop and Heat Transfer in Microchannel Evaporators of Air Conditioning and Refrigeration Systems
Mulugurthi, Sarath Kumar (2015-12-01)In Air-conditioning and Refrigeration systems, a small portion of the compressor oil circulates with the refrigerant through the cycle components. The oil circulating with the refrigerant flow retains in heat exchangers ...