Post-occupancy HVAC survey: What can be learned form 1,800 measurements

2021 ◽  
Vol 263 (1) ◽  
pp. 5083-5089
Author(s):  
Jeff Fullerton ◽  
Alexander Maurer
Keyword(s):  
Heat Pump ◽  
Hvac Systems ◽  
Solar Exposure ◽  
Sound Levels ◽  
Comprehensive Survey

After opening a new multi-family residential complex, the association was asked to perform a comprehensive survey of the sound from their HVAC systems. The survey sought to quantify the sound levels from every HVAC diffuser, grille, and register that served the residences and common spaces. The effort required access into over 250 residences typically measuring between 3 and 5 locations in each residence, and as many as 7 to 9 locations in penthouse residences. While the heat pump systems serving the residences were similar models, their capacities varied depending on the square footage and solar exposure of the residence. The variations in the sound levels of these systems and from the central ventilation were significant. This presentation will highlight what was learned from the survey.

Evaluation of Ground Source Heat Pump Energy, Demand, and Greenhouse Potential in Colorado Residential Buildings

2010 ◽  
Author(s):  
Daniel Studer ◽  
Moncef Krarti
Keyword(s):  
Heat Pump ◽  
Energy Demand ◽  
Residential Buildings ◽  
Pump Energy ◽  
Hvac Systems ◽  
Heat Pumps ◽  
Ground Source Heat Pump ◽  
Ground Source Heat Pumps ◽  
Vertical Well ◽  
Ground Source

This paper summarizes the results of a detailed energy analysis carried out for a typical Colorado residence using three different HVAC systems for 10 distinct locations in Colorado. The HVAC systems considered in the analysis include: • 78% efficient furnace with a 13 SEER air conditioner; • Vertical well ground source heat pump with a heating COP of 3.5 and a cooling EER of 17.1; • Slinky ground source heat pump with a heating COP of 3.5 and a cooling EER of 17.1. The results of the analysis indicate that relative to the conventional systems, ground source heat pumps (GSHPs) offer several benefits including lower annual energy costs, electrical peak demand, and carbon emissions. However, GSHPs use more electrical energy use. Specifically, it was found that relative to a 78 AFUE furnace / 13 SEER AC system, in all locations both GSHPs, vertical well and slinky, show on average a 41.2% increase in electricity use, a 10% decrease in energy cost, a 4.5% decrease in CO2 emissions, and a 16.8% average decrease in peak summer electric demand.

scholarly journals Experimental data acquisition and analysis of an underground thermal storage medium

2021 ◽  
Author(s):  
Alejandro Gonzalez-Ferras
Keyword(s):  
Experimental Data ◽  
Energy Consumption ◽  
Heat Pump ◽  
Fossil Fuel ◽  
Hvac Systems ◽  
Ground Source Heat Pump ◽  
Storage Medium ◽  
Fossil Fuel Consumption ◽  
Ground Source ◽  
Source Sink

A ground source heat pump (GSHP) is a system that uses the ground as a heat source/sink to provide heating/cooling to a conditioned space. During the winter, a GSHP uses a heat pump cycle to move heat from the ground into a space in order to heat it In the summer, the space is cooled as heat is pumped out of the space and back into the ground GSHPs are a sustainable alternative to conventional HVAC systems because they do not rely on direct fossil fuel consumption, and they are highly efficient as they move heat rather than generate it In addition, the temperature of the ground remains constant throughout the year, resulting in a greater thermal efficiency, and therefore less energy consumption

scholarly journals Assessing the performance and cost-competitiveness of a dual-source solar assisted heat pump in cold climates

2021 ◽  
Vol 246 ◽  
pp. 06007
Author(s):  
Jeremy Sager ◽  
Jean-Philippe Poirier
Keyword(s):  
Greenhouse Gas ◽  
Heat Pump ◽  
Energy Savings ◽  
Hvac Systems ◽  
Heat Pumps ◽  
Cold Climates ◽  
Greenhouse Gas Reduction ◽  
Dual Source ◽  
Cost Competitiveness ◽  
The Impact

In many cold climates, the coincidence of long heating seasons as well as relatively high levels of solar insolation offer an opportunity to explore the potential for solar-assisted air source heat pumps to meet greenhouse gas reduction objectives for space and water heating systems. This paper presents the results of a detailed performance analysis based on 6 months of field test data of a pre-commercial, dual source solar-assisted heat pump. The data gathered during field-testing as well as the functionality of the system were studied extensively to develop and calibrate an hourly energy model. The model replicates the performance and operating modes of the solar-assisted air source heat pump. It allows for an hourly assessment of the energy savings, greenhouse gas reduction potential and cost competitiveness of this system as compared to other high performance HVAC systems in a variety of climate locations and archetype house loads. A parametric analysis is undertaken to assess the impact of key components on system viability. Results indicate that for some regions and archetype house loads, the dual-source solar-assisted heat pump can lead to significant energy savings and GHG emissions reductions when compared to high performing HVAC systems. These savings may enable a favorable payback period when a competitive capital cost is considered. The objective of the study was to identify locations and archetypes in which this solar-assisted heat pump topology may make sense for further development and demonstration.

scholarly journals Experimental data acquisition and analysis of an underground thermal storage medium

2021 ◽  
Author(s):  
Alejandro Gonzalez-Ferras
Keyword(s):  
Experimental Data ◽  
Energy Consumption ◽  
Heat Pump ◽  
Fossil Fuel ◽  
Hvac Systems ◽  
Ground Source Heat Pump ◽  
Storage Medium ◽  
Fossil Fuel Consumption ◽  
Ground Source ◽  
Source Sink

A ground source heat pump (GSHP) is a system that uses the ground as a heat source/sink to provide heating/cooling to a conditioned space. During the winter, a GSHP uses a heat pump cycle to move heat from the ground into a space in order to heat it In the summer, the space is cooled as heat is pumped out of the space and back into the ground GSHPs are a sustainable alternative to conventional HVAC systems because they do not rely on direct fossil fuel consumption, and they are highly efficient as they move heat rather than generate it In addition, the temperature of the ground remains constant throughout the year, resulting in a greater thermal efficiency, and therefore less energy consumption

Informing Low Carbon HVAC Systems Modelling and Design, Using a Global Sensitivity Analysis Framework

2016 ◽  
Author(s):  
Maria-Anna Chatzopoulou ◽  
James Keirstead ◽  
David Fisk ◽  
Christos N. Markides
Keyword(s):  
Sensitivity Analysis ◽  
Energy Consumption ◽  
Heat Pump ◽  
Global Sensitivity Analysis ◽  
Peak Load ◽  
Energy Performance ◽  
Hvac Systems ◽  
Point Estimate ◽  
Low Carbon ◽  
Global Sensitivity

Buildings are widely recognised as key contributors to global energy use and emissions. Approximately 50% of the energy consumption of the non-domestic buildings is due to Heating Ventilation and Air-Conditioning (HVAC) systems. Therefore, there is great potential in improving the energy performance of buildings, by investigating the deployment of low-carbon HVAC technologies. HVAC system selection is usually performed in early design stages, when there is high uncertainty associated with the system’s requirements. To deal with these uncertainties, Global Sensitivity Analysis (GSA) can be deployed. GSA can systematically identify the most important variables, in terms of their impact on system performance. This study considers the usefulness of GSA in designing HVAC systems with an office building case study. GSA identifies the heat pump and heat recovery efficiencies as the most significant uncertain parameters. These, account for more than 90% of the observed variation in the energy consumption. Additionally, the results reveal that by selecting a heat pump capacity at 80% of the potential annual peak load point estimate, there is 95% probability for the system to satisfy the peak demand at any given hour. The analysis demonstrates the potential of GSA in informing the design of novel HVAC and power generation technologies.

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