Design of Potable Water Plumbing Systems
Design of Potable Water Plumbing Systems
Credit to: https://www.cedengineering.com/
Author: A. Bhatia
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Chilled Water Plant Design Guide
Introduction:
Many large buildings, campuses, and other facilities have plants that make chilled water and distribute it to air handling units and other cooling equipment. The design operation and maintenance of these chilled water plants has a very large impact on building energy use and energy operating cost. Not only do chilled water plants use very significant amounts of electricity (as well as gas in some cases), they also significantly contribute to the peak load of buildings. The utility grid in California, and in many other areas of the country, experiences its maximum peak on hot summer days. During this peak event, chilled water plants are often running at maximum capacity. When temperatures are moderate, chilled water plants are shut down or operated in stand-by mode. This variation in the rate of energy use is a major contributor to the peaks and valleys in energy demand, which is one of the problems that must be addressed by utility grid managers. Most buildings and facilities that have chilled water plants have special utility rates where the cost of electricity depends on when it is used and the maximum rate of use. For instance, PG&E has five time charge periods: summer on-peak, summer mid-peak, summer off-peak, winter mid-peak and winter off-peak. The price of electricity is several times higher during the summer on-peak than it is during the off-peak periods. Not only does the cost of electricity vary, but most utility rates also have a monthly demand charge based on the maximum rate of electricity use for the billing period. Since chilled water plants operate more intensely during the summer peak period, efficiency gains and peak reductions can result in very large utility bill savings. In addition to new construction, the chilled water plants of many existing buildings are being replaced or overhauled. Older chilled water plants have equipment that uses ozone-damaging refrigerants. International treaties, in particular the Montreal Protocol, call for ozone damaging chemicals (in particular CFCs) to be phased out of production. As the availability of CFCs is reduced, the price will skyrocket, creating pressure for chilled water plants to be overhauled or replaced.
Chilled Water Plant Design Guide
Introduction:
Many large buildings, campuses, and other facilities have plants that make chilled water and distribute it to air handling units and other cooling equipment. The design operation and maintenance of these chilled water plants has a very large impact on building energy use and energy operating cost. Not only do chilled water plants use very significant amounts of electricity (as well as gas in some cases), they also significantly contribute to the peak load of buildings. The utility grid in California, and in many other areas of the country, experiences its maximum peak on hot summer days. During this peak event, chilled water plants are often running at maximum capacity. When temperatures are moderate, chilled water plants are shut down or operated in stand-by mode. This variation in the rate of energy use is a major contributor to the peaks and valleys in energy demand, which is one of the problems that must be addressed by utility grid managers. Most buildings and facilities that have chilled water plants have special utility rates where the cost of electricity depends on when it is used and the maximum rate of use. For instance, PG&E has five time charge periods: summer on-peak, summer mid-peak, summer off-peak, winter mid-peak and winter off-peak. The price of electricity is several times higher during the summer on-peak than it is during the off-peak periods. Not only does the cost of electricity vary, but most utility rates also have a monthly demand charge based on the maximum rate of electricity use for the billing period. Since chilled water plants operate more intensely during the summer peak period, efficiency gains and peak reductions can result in very large utility bill savings. In addition to new construction, the chilled water plants of many existing buildings are being replaced or overhauled. Older chilled water plants have equipment that uses ozone-damaging refrigerants. International treaties, in particular the Montreal Protocol, call for ozone damaging chemicals (in particular CFCs) to be phased out of production. As the availability of CFCs is reduced, the price will skyrocket, creating pressure for chilled water plants to be overhauled or replaced.
Guidelines for Drinking-Water Quality
The primary purpose of the Guidelines for drinking-water quality is the protection of public health. The Guidelines provide the recommendations of the World Health Organization (WHO) for managing the risk from hazards that may compromise the safety of drinking-water. The recommendations should be
considered in the context of managing the risk from other sources of exposureto these hazards, such as waste, air, food and consumer products.
Guidelines for Drinking-Water Quality
The primary purpose of the Guidelines for drinking-water quality is the protection of public health. The Guidelines provide the recommendations of the World Health Organization (WHO) for managing the risk from hazards that may compromise the safety of drinking-water. The recommendations should be
considered in the context of managing the risk from other sources of exposureto these hazards, such as waste, air, food and consumer products.
Design of Reverse Osmosis Process For The Purification Of River Water In The Southern Belt Of Bangladesh
Introduction
Abundance and quality water supply is essential for all living species. Sustainable agriculture and industrial production need steady supply of freshwater. In many parts of the today’s world, desalination plays a vital role for sustaining human habitation besides the existing conventional water treatment technologies. Membrane based RO process has become a popular method to supply the fresh water from seawater and brackish water in different regions. RO (Figure 1) is a pressure driven process which under pressure reverses the flow direction of the solvent (in the opposite direction of osmosis process). Substantial efforts have been made by researchers on freshwater production (Sassi, 2012) and wastewater treatment (Stoller et al., 2016) using the RO. Rapid growth of membrane desalination processes enhanced the removal of ionic contaminants (Sassi and Mujtaba, 2013), pharmaceutical active compounds (Gur-Reznik et al., 2011) and other types of effluents from chemical, petrochemical, electrochemical, food, paper and tanning industries. Demineralised water can be supplied to several industries by treating the saline water using the RO process. However, there are limited studies on the production of demineralised water. Demineralised water is completely free (or almost) of dissolved minerals (Kremser et al. 2006) which has total dissolved solids (TDS) as low as 1 mg/l. Kremser et al. (2006) described operating experience on demineralized water plant.
In this work, RO based desalination process is considered using three stages described by (Sassi, 2012) as shown in Figure 1. The plant nominal operating and design parameters (of commercial Film Tec spiral wound RO membrane elements) are taken from Abbas (2005). Firstly, the model prediction is validated against those reported by Sassi and Mujtaba (2010). Secondly, an optimization problem incorporating a process model is formulated to optimize the design and operating parameters in order to minimize specific energy consumption and the results are compared with Sassi (2012). Since those models (Sassi, 2012) are validated for freshwater production, the model parameters such as (water and salt permeability coefficients) needs to be updated for demineralised water. A structure of the RO network is developed based on RO network (two-stage seawater pass and two-stage brackish water pass). Different parameters are updated for the model from the literature.
Design of Reverse Osmosis Process For The Purification Of River Water In The Southern Belt Of Bangladesh
Introduction
Abundance and quality water supply is essential for all living species. Sustainable agriculture and industrial production need steady supply of freshwater. In many parts of the today’s world, desalination plays a vital role for sustaining human habitation besides the existing conventional water treatment technologies. Membrane based RO process has become a popular method to supply the fresh water from seawater and brackish water in different regions. RO (Figure 1) is a pressure driven process which under pressure reverses the flow direction of the solvent (in the opposite direction of osmosis process). Substantial efforts have been made by researchers on freshwater production (Sassi, 2012) and wastewater treatment (Stoller et al., 2016) using the RO. Rapid growth of membrane desalination processes enhanced the removal of ionic contaminants (Sassi and Mujtaba, 2013), pharmaceutical active compounds (Gur-Reznik et al., 2011) and other types of effluents from chemical, petrochemical, electrochemical, food, paper and tanning industries. Demineralised water can be supplied to several industries by treating the saline water using the RO process. However, there are limited studies on the production of demineralised water. Demineralised water is completely free (or almost) of dissolved minerals (Kremser et al. 2006) which has total dissolved solids (TDS) as low as 1 mg/l. Kremser et al. (2006) described operating experience on demineralized water plant.
In this work, RO based desalination process is considered using three stages described by (Sassi, 2012) as shown in Figure 1. The plant nominal operating and design parameters (of commercial Film Tec spiral wound RO membrane elements) are taken from Abbas (2005). Firstly, the model prediction is validated against those reported by Sassi and Mujtaba (2010). Secondly, an optimization problem incorporating a process model is formulated to optimize the design and operating parameters in order to minimize specific energy consumption and the results are compared with Sassi (2012). Since those models (Sassi, 2012) are validated for freshwater production, the model parameters such as (water and salt permeability coefficients) needs to be updated for demineralised water. A structure of the RO network is developed based on RO network (two-stage seawater pass and two-stage brackish water pass). Different parameters are updated for the model from the literature.
Design and Optimization of Ultrafiltration Membrane Setup for Wastewater Treatment and Reuse
With the advances in the membrane technology, there is an ongoing quest to determine the best optimal configuration for an adopted treatment as well as it’s polishing to achieve cumulative sustainability for the treatment process. Henceforth, this thesis report is an evaluation to devise a membrane filtration process for investigating the possibility of treating pre-sedimented municipal wastewater with ceramic ultrafiltration, optimizing the membrane as a pre-treatment for reverse osmosis as an overall strategy for recovering wastewater.
Design and Optimization of Ultrafiltration Membrane Setup for Wastewater Treatment and Reuse
With the advances in the membrane technology, there is an ongoing quest to determine the best optimal configuration for an adopted treatment as well as it’s polishing to achieve cumulative sustainability for the treatment process. Henceforth, this thesis report is an evaluation to devise a membrane filtration process for investigating the possibility of treating pre-sedimented municipal wastewater with ceramic ultrafiltration, optimizing the membrane as a pre-treatment for reverse osmosis as an overall strategy for recovering wastewater.
CoolToolsTM Chilled Water Plant Design and Specification Guide
Abstract:
The CoolToolsTM Chilled Water Plant Design and Specification Guide is targeted to a technical design audience. It includes design issues such as selection of coils, application of different piping distribution systems, design and applications of controls, mitigation of low delta-t syndrome, and a myriad of other performance critical issues. It also includes a section on Performance Specifications, which is targeted to equipment specifiers, including engineers and facility purchasing agents. It details methods to request and analyze the performance data of submitted equipment. Topics include zero tolerance performance specifications, applications of witness tests, and performance tables for bid alternates.
CoolToolsTM Chilled Water Plant Design and Specification Guide
Abstract:
The CoolToolsTM Chilled Water Plant Design and Specification Guide is targeted to a technical design audience. It includes design issues such as selection of coils, application of different piping distribution systems, design and applications of controls, mitigation of low delta-t syndrome, and a myriad of other performance critical issues. It also includes a section on Performance Specifications, which is targeted to equipment specifiers, including engineers and facility purchasing agents. It details methods to request and analyze the performance data of submitted equipment. Topics include zero tolerance performance specifications, applications of witness tests, and performance tables for bid alternates.
Design of Water Hammer Shock Absorber
Abstract:
In the piping system, water hammer or hydraulic shock is a major issue that engineers need to consider. Water hammer is a phenomenon that leads to shock waves in the fluid due to rapid closing and opening of the valve, which can affect pipes, valves and gauges in any water, gas, or oil applications due to the sudden transient event. It is there for every system that has a flow of fluid through pumping such as houses, hospitals, and influences major effectiveness in the power plant. It occurs when there is a pressure difference in the pipeline leading to a loud noise. Specifically, this project is aimed to design a pipeline system and develop solutions to reduce the water hammer using a shock absorber. The main idea of the design project is to design a water hammer system using a shock absorber in order to reduce the shock waves of the pipes.
Design of Water Hammer Shock Absorber
Abstract:
In the piping system, water hammer or hydraulic shock is a major issue that engineers need to consider. Water hammer is a phenomenon that leads to shock waves in the fluid due to rapid closing and opening of the valve, which can affect pipes, valves and gauges in any water, gas, or oil applications due to the sudden transient event. It is there for every system that has a flow of fluid through pumping such as houses, hospitals, and influences major effectiveness in the power plant. It occurs when there is a pressure difference in the pipeline leading to a loud noise. Specifically, this project is aimed to design a pipeline system and develop solutions to reduce the water hammer using a shock absorber. The main idea of the design project is to design a water hammer system using a shock absorber in order to reduce the shock waves of the pipes.
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