Gas hot water tank (0.56 efficiency) with 122 cm (48 in.)ĭrain-water heat recovery (0.6 efficiency) unit-Test Iġ2. Electric hot water tank (0.94 efficiency) with 122 cm (48 in.)ĭrain-water heat recovery (0.6 efficiency) unit-Test Hġ1. Electric hot water tank (0.94 efficiency) with timers off during High-efficiency (78%) on-demand modulating gas comboĩ. High-efficiency (83%) on-demand gas hot water-Test EĨ. Solar hot water preheat with electric (0.94 efficiency)ħ.
Solar hot water preheat with gas (0.56 efficiency) backup-TestĦ.
Ground-source heat pump (GSHP) for heat and hot water-Test Bĥ. The house is based on the design of the CCHT houses (CCHT 2004) inįollowing are the different DHW models studied:Ģ. The R-2000 Standard (NRCan 2005) located in Whit by, Ontario, Canada. This case study is based on an energy-efficient house built using Its use to reduce overall energy costs and greenhouse gas (GHG) Our objective is to study the effects of the TOU feature by optimizing As an initiative of the province of Ontario, all homes andīusinesses will be equipped with smart meters using TOU pricing by 2010. The costs to produce the electricity at different times of the day (OEBĢ008). Kilowatt-hour change throughout the day to better reflect the changes in Pricing, which also encourages conservation and ensures the pricesĬonsumers pay for electricity better reflect the actual costs of Ontario Energy Board (OEB) to provide stable and predictable electricity The TOU electricity plan was developed by Anotherįeature of this study is to model and analyze the effect of time-of-use In the first part of this case study, conventional and solar-basedĭHW systems are simulated and their results are compared. Of the electric and natural-gas-based solar hot water systems was 0.5Īnd 2 years, respectively, for the same fuel-based conventional hot They concluded that the energy payback period Load profile might not be disregarded when combi stores are compared.Ĭrawford and Treloar (2004) studied the net energy analysis of solar andĬonventional DHW systems. They concluded that the influence of the DHW Using the TRNSYS model, they generated a more realistic profile Profiles with a constant total yearly heat demand for a solar combi AĬase study by Jordan and Vajen (2000) analyzed the influence of DHW load Performance testing to reflect conditions experienced in the field. TheyĬoncluded that realistic daily profiles should be used in the (2006) studied the influence of the DHW daily draw-off profile.
Water with solar thermal collectors with an electric backup is the best A recent studyīy Biaou and Bernier (2005) using TRNSYS compared four different DHW On-demand system over the electric tank system were 34%. Model (TESS 2011), they showed that electrical energy savings for the Storage tanks and electric on-demand tanks. The energy performance of two different types of water heaters: electric In their research, test experiments were conducted to measure Performance testing and annual simulations of electric water-heating Residential hot water systems (Wiehagen et al., 2003). (NREL) in Colorado, USA, carried out a performance comparison of Retrieved from ĭomestic hot water (DHW) systems have been subjected to manyĬomparison studies in the past. APA style: Energy and environmental analysis of residential hot water systems: a study for Ontario, Canada.Energy and environmental analysis of residential hot water systems: a study for Ontario, Canada." Retrieved from 2011 American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc.
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