Energy and thermal comfort performance evaluation of thermostatic and electronic mixing valves used to provide domestic hot water of buildings

Rahmatmand, Ali; Vratonjic, Marin; Sullivan, Pierre E.

doi:10.1016/j.enbuild.2020.109830

Cited by 15 publications

(10 citation statements)

References 21 publications

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“…Numerical Modeling. A 14-story (297 units) building with a single recirculation loop (i.e., single-zone high-rise building) was selected for this study [4], where time-varying temperature and flow field data to aid with model validation have been obtained. A schematic of the mechanical room consisting of a Controlled-Loop Injection (CLI) device and a hot-water storage tank (located on the roof of the building) together with the domestic hot-water (DHW) distribution system is shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

“…The field data were captured (FD-R series clamp-on flowmeters) over 7 days for the CLI device installation [4]. Field measurement locations include the following [4]:…”

Section: Methodsmentioning

confidence: 99%

“…DHW temperature control needs to ensure resident safety and comfort while meeting building regulations regarding Legionella and scalding. There are four main areas in DHW distribution systems that affect energy consumption in high-rise buildings [3,4]:…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…To account for the fluctuating nature of hot and cold streams, a field study compared the thermostatic mixing valve (TMV) to a controlled-loop injection (CLI) device in a 14-story high-rise building [4]. The results showed that CLI not only provided better temperature control throughout 24 h, but also reduced water temperature below 49°C (120°F) to save energy during lowdemand periods [4]. This study also reported that the building's recirculation flowrate was 40% higher using the CLI installation, which was indicative of less pressure drop in the DHW loop giving further insight into energy and water-usage improvements [4].…”

Section: Introductionmentioning

confidence: 99%

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Model of a System-Wide Domestic Hot-Water Distribution System in a Multi-Resident High-Rise Building

Vratonjic

Rahmatmand

Marish³

et al. 2021

ASME Journal of Engineering for Sustainable Buildings and Cities

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To reduce the environmental impact and cost, energy and water consumption of multi-resident buildings should be improved while ensuring resident comfort. Inefficient mixing of hot and cold-water streams and a non-optimal domestic hot-water (DHW) distribution system design can cause higher energy consumption, component failures, and dissatisfied residents. An OpenModelica (OM) system-wide model of a 14-story building consisting of a controlled-loop injection (CLI) device and a DHW distribution system is presented. The OM results are validated against field measurements at discreet locations within a single-zone closed-loop circuit to ensure the validity of time-varying temperature and flowrate. The study demonstrates that OM is a useful engineering tool to model single and multi-zone high-rise buildings that allows advanced analysis, including system-wide optimization, advanced on-demand controls, and energy and water-usage efficiencies.

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Section: Methodsmentioning

confidence: 99%

“…The field data were captured (FD-R series clamp-on flowmeters) over 7 days for the CLI device installation [4]. Field measurement locations include the following [4]:…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Model of a System-Wide Domestic Hot-Water Distribution System in a Multi-Resident High-Rise Building

Vratonjic

Rahmatmand

Marish³

et al. 2021

ASME Journal of Engineering for Sustainable Buildings and Cities

Self Cite

View full text Add to dashboard Cite

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Judicious method of integrating phase change materials into a building envelope under Saharan climate

Hamdani

Bekkouche

Al‐Saadi

et al. 2021

Intl J of Energy Research

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Phase change materials (PCMs) have been extensively used for thermal storage systems in buildings. To enhance the building's thermal and energy performance, PCMs can be embedded into envelope systems to reduce the cooling and heating demand. A PCM's melting temperature close to the thermal comfort range (20 C-26 C) can potentially be an attractive solution. In this work, the thermal and energy performance of a building in Saharan climate, specifically Ghardaïa in Algeria, was modeled using the TRNSYS-18 simulation package. A newly developed module (Type-285) was compiled for this version to evaluate different PCMs integration approaches in building envelope. Integration techniques have been evaluated based on three performance indicators, namely, monthly and annual energy savings, mean air temperature, and the daily average temperature fluctuation. When considering the conventional PCMs integration within the building envelope, a reduction of 36.4% in annual energy consumption was achieved. The study indicated that when PCMs are carefully integrated based on orientations and seasons, a reduction of 50.71% in annual energy consumption is possible, an additional 14.34% to the conventional PCMs integration. In addition, PCMs provided an enhanced thermal performance and a significant reduction in indoor temperatures that ranged between 2.36 C to 4 C. The study proposes an improved PCMs integration approach which can be possibly implemented if movable PCMs panels are used instead of the conventional static PCMs panels. K E Y W O R D Sair temperature, energy savings, heating and cooling energy needs, melting PCM temperature, phase change materials, TRNSYS-18

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Controlling the Hybrid PV/T System Self-heating Using Extrinsic Cell Resistance

Moussavou

Raji

Adonis

2021

Advanced Technologies for Solar Photovoltaics Energy Systems

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Energy and thermal comfort performance evaluation of thermostatic and electronic mixing valves used to provide domestic hot water of buildings

Cited by 15 publications

References 21 publications

Model of a System-Wide Domestic Hot-Water Distribution System in a Multi-Resident High-Rise Building

Model of a System-Wide Domestic Hot-Water Distribution System in a Multi-Resident High-Rise Building

Judicious method of integrating phase change materials into a building envelope under Saharan climate

Controlling the Hybrid PV/T System Self-heating Using Extrinsic Cell Resistance

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