A Simplified Method to Predict Energy Cost Savings in Office Buildings Using a Hybrid Desiccant, Absorption Chiller, and Natural Gas Turbine Cogeneration System With Thermal Storage

2007 ◽  
Author(s):  
James McNeill ◽  
Jon Previtali ◽  
Moncef Krarti
Keyword(s):  
Natural Gas ◽  
Gas Turbine ◽  
Energy Cost ◽  
Cost Savings ◽  
Thermal Storage ◽  
Analysis Tool ◽  
Conventional System ◽  
Absorption Chiller ◽  
Cogeneration System ◽  
Simplified Analysis

This paper provides a simplified analysis tool to predict the energy savings associated with the usage of a hybrid air conditioning system that combines liquid desiccant, absorption chiller, natural gas turbine cogeneration system with thermal storage (hereafter hybrid cogeneration system) versus a watercooled centrifugal chiller with a natural gas boiler (hereafter conventional system). The hybrid cogeneration system is controlled to track both electrical and thermal loads. The simplified analysis method is formulated from detailed energy simulation models. A direct correlation has been determined between the energy cost savings of using the hybrid cogeneration system instead of the conventional system and the cogeneration capacity, peak electricity rate, and natural gas rate for five U.S. cities: Atlanta, Chicago, Denver, New York, and San Francisco.

scholarly journals Natural gas engine driven heat pump system – a case study of an office building

2021 ◽  
Author(s):  
Farshad Kimiaghalam
Keyword(s):  
Natural Gas ◽  
Heat Pump ◽  
Energy Cost ◽  
Cost Savings ◽  
Office Building ◽  
Pump System ◽  
Heat Pump System ◽  
Gas Engine ◽  
Natural Gas Engine ◽  
Thunder Bay

An eQUEST model was developed to conduct a study of a natural gas engine driven heat pump (GEHP) for an office building in Woodstock, Ontario. The results were also compared with a roof-top unit to investigate annual potential energy saving using GEHP. The models were also calibrated with regression analysis which was obtained from measured data and validated with respect to ASHRAE Guideline 14-2002. The developed ad validated models were used to predict the performance of these system in different regions of Ontario; Toronto, Ottawa, Windsor and Thunder Bay. The results for five cities were compared in terms of annual energy, GHG and energy cost savings. It was concluded that Thunder Bay has the highest annual energy and GHG saving, while Toronto has the highest annual energy cost saving.

Commercial Integrated Energy Systems Provide Data That Advance Combined Cooling, Heating, and Power

2006 ◽  
Author(s):  
Andrei Y. Petrov ◽  
Jeanette B. Berry ◽  
Abdolreza Zaltash
Keyword(s):  
Natural Gas ◽  
System Design ◽  
Gas Turbine ◽  
Energy Systems ◽  
Modular System ◽  
Absorption Chiller ◽  
Fuel Use ◽  
Oak Ridge ◽  
Integrated Energy Systems ◽  
Combined Cooling

The Department of Energy (DOE), though Oak Ridge National Laboratory (ORNL), has worked in partnership with industry to develop highly-efficient Integrated Energy Systems (IES) that provide combined cooling, heating, and power (CHP). Equipment configurations and performance have been optimized and system construction has been simplified, resulting in lower design and installation costs. Consequently, government-industry partnerships are achieving the goal of promoting replication of these advanced systems. This paper describes and presents data collected during the operation of on-site power generation systems developed and implemented by DOE/ORNL-industry teams: (1) Burns & McDonnell and (2) Honeywell Labs. The Burns & McDonnell IES is operated by Austin Energy, the municipal utility in Austin, Texas. The gas turbine produces 4.5-MW of electricity, and its exhaust drives a 2,500-ton absorption chiller. The featured project implements a modular system design that is being used to construct a medical district utility at Dell Children's Medical Center of Central Texas-another government-industry project carried out in partnership with Austin Energy. The Honeywell IES at Ft. Bragg, North Carolina, is anchored by 5.7-MW natural-gas turbine that uses turbine exhaust to drive a 1,000-ton absorption chiller and/or an 80,000-lb/h heat recovery steam generator. An optimization software program provides system operators with hour-by-hour information on system costs associated with various operating scenarios. The project developed reference designs for 1.2-5.7 MW turbine-based systems to better communicate options for system design and facilitate feasibility studies. These systems demonstrate the thermal and economic value of "waste heat" by providing space heating and/or cooling with no additional fuel use. Field data confirms that the fuel use efficiency of these combined cooling, heating and power systems approaches 80% based on the higher heating value (HHV) of natural gas.

scholarly journals Impact of Carbon Pricing on Energy Cost Savings Resulting from Installation of Gas-Fired Absorption Heat Pump at A Library Building in Ontario

Proceedings ◽  
2019 ◽  
Vol 23 (1) ◽  
pp. 2 ◽  
Author(s):  
Altamash Ahmad Baig ◽  
Alan S. Fung
Keyword(s):  
Natural Gas ◽  
Heat Pump ◽  
Energy Cost ◽  
Energy Savings ◽  
Cost Savings ◽  
Conventional Heating ◽  
Positive Energy ◽  
Cooling Mode ◽  
Carbon Pricing ◽  
Absorption Heat Pump

This paper presents the results of analyzing the potential benefits of a natural gas-fired absorption heat pump (GAHP) for a library building in Ontario in terms of energy savings, fuel cost savings, and reduction in greenhouse gas emissions. Simulation model for the library building was created in eQUEST and calibrated using the energy consumption data from the 2012–2014. The results for energy savings were analyzed to include the effect of implementation of carbon pricing. It was concluded that because of implementation of carbon pricing, the replacement of conventional heating equipment with more efficient gas-fired heat pump would increase the monetary value of the savings achieved from reduced natural gas consumption, due to increased price of natural gas. Furthermore, due to the longer heating season in Canada and the relatively higher price of electricity compared to natural gas the gas-fired heat pump can potentially achieve positive energy cost savings when operated in both heating and cooling mode even after implementation of carbon pricing.

scholarly journals Natural gas engine driven heat pump system – a case study of an office building

2021 ◽  
Author(s):  
Farshad Kimiaghalam
Keyword(s):  
Natural Gas ◽  
Heat Pump ◽  
Energy Cost ◽  
Cost Savings ◽  
Office Building ◽  
Pump System ◽  
Heat Pump System ◽  
Gas Engine ◽  
Natural Gas Engine ◽  
Thunder Bay

An eQUEST model was developed to conduct a study of a natural gas engine driven heat pump (GEHP) for an office building in Woodstock, Ontario. The results were also compared with a roof-top unit to investigate annual potential energy saving using GEHP. The models were also calibrated with regression analysis which was obtained from measured data and validated with respect to ASHRAE Guideline 14-2002. The developed ad validated models were used to predict the performance of these system in different regions of Ontario; Toronto, Ottawa, Windsor and Thunder Bay. The results for five cities were compared in terms of annual energy, GHG and energy cost savings. It was concluded that Thunder Bay has the highest annual energy and GHG saving, while Toronto has the highest annual energy cost saving.

Energy and Exergy Analyses of a Natural Gas Fired Combined Cycle Cogeneration System

2007 ◽  
Author(s):  
B. Law ◽  
B. V. Reddy
Keyword(s):  
Natural Gas ◽  
Gas Turbine ◽  
Pressure Ratio ◽  
Combined Cycle ◽  
Operating Conditions ◽  
Operating Variables ◽  
Energy And Exergy ◽  
Cogeneration System ◽  
Multiple Process ◽  
Process Heat

Combined cycle cogeneration systems have the ability to produce power and process heat more efficiently, leading to higher performance and reduced green house gas emissions. In the present work the performance of a natural gas fired combined cycle cogeneration unit with multiple process heaters is investigated to study the effect of operating variables on the performance. The operating conditions investigated include, gas turbine pressure ratio, process heat loads and process steam extraction pressure. The gas turbine pressure ratio significantly influences the performance of the combined cycle cogeneration system. The process heat load influences combined cycle efficiency and combined cycle cogeneration efficiency in opposite ways. The exergy analysis is conducted to identify the exergy destruction and losses in different components of the combined cycle cogeneration unit.

scholarly journals Utilization of the Exhaust Gas of a Gas Pipeline Compression Station to Generate Electricity

2017 ◽  
pp. 573-583
Author(s):  
Ehsan Amirabedin ◽  
M. Zeki Yilmazoglu ◽  
Ali Durmaz
Keyword(s):  
Natural Gas ◽  
Gas Turbine ◽  
Energy Savings ◽  
Waste Heat ◽  
Organic Rankine Cycle ◽  
Cost Savings ◽  
Transportation Cost ◽  
Working Fluid ◽  
Exhaust Gas ◽  
Gas Compression

In this study, an application of an Organic Rankine Cycle (ORC) in a natural gas compression station in Erzincan region is presented. Natural gas compression station (NGCS) uses a gas turbine to pressurize the natural gas for transportation. Waste heat of gas turbine can be utilized by an ORC which uses n-pentane as working fluid to generate electricity. A costs/advantages analysis of the implementation is performed. According to designing factors, the pressure of the natural gas at the inlet and outlet of the NGCS are 48 bar and 73 barrespectively. Mass flow rate and temperature of the exhaust gas from the GT are 26.65 kg/s and 460°C respectively and it shows that a significant amount of heat is rejected to the ambient. By applying an ORC to the NGCS, the results show that; total gross power via organic turbine, annual energy savings and annual cost savings are 1,385 kW, 11,057,535 kWhr and 1,327,000 $ respectively. Furthermore the payback time is calculated 3.77 years. Generally in this study, by utilizing an ORC in a NGCS, it has been tried to reduce the transportation cost and environmental impact of NG transportation.

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