ELECTRICAL SYSTEM:
We are dedicated for Making Design, Drawing, BOQ and Tender document, Tender Evaluation, Supervision of Electrical System. In this system shall include, but not be limited to HT and LT Power cable, Cable tray, Switchgear, Power Transformer, Low Tension Switchgear, Power Factor Improvement Plant, Bus bar Turn king System (BBT), Substation Battery and charger, Underground cables, Ear thing, Fixture layout inside room, corridor and other specs and Co-ordinate with other services. Standards, Codes, Rules: Unless otherwise specified elsewhere in the contract, the entire system shall be manufactured, install, tested and balanced conforming to the latest issue of the following standards: ANSI, ASTM, BNBC, NEMA, NFPA, UL, IEEE etc.
Sub-Station: The first step of eMcS in designing a Substation is to design an Earthling and Bonding system. Earthling and Bonding The function of an earthling and bonding system is to provide an earthling system connection to which transformer neutrals or earthling impedances may be connected in order to pass the maximum fault current. The earthling system also ensures that no thermal or mechanical damage occurs on the equipment within the substation, thereby resulting in safety to operation and maintenance personnel. The earthling system also guarantees equip potential bonding such that there are no dangerous potential gradients developed in the substation.
Substation Earthling Calculation Methodology:
Calculations for earth impedances and touch and step potentials are based on site measurements of ground resistivity and system fault levels. A grid layout with particular conductors is then analyzed to determine the effective substation earthling resistance, from which the earthling voltage is calculated.
Generator:
While most sizing exercises are best done with sizing programs or with the help of a manufacturer’s representative, it is still important to understand the factors that affect the operation of your generator set so you can be confident you have the right equipment for your application.
The first step in sizing and selecting a generator set is to establish project parameters.
- Minimum generator set load/capacity: Running a generator set under light load can lead to engine damage, reducing reliability. Standard Power Generation does not recommend running generator sets at less than 30 percent of rated load. Load banks should supplement the regular loads when loading falls below the recommended value.
- Maximum allowable step voltage dip (starting and running): As you reduce the maximum allowable step voltage dip during initial startup, when loads cycle under automatic controls or when high peak loads operate, you need to increase the size of the generator set specified. Choosing lower allowable voltage dip requires a larger generator set.
- Maximum allowable step frequency dip: As you reduce the maximum allowable frequency dip, you increase the size of the generator set needed.
Boiler:
Boiler design is the process of designing of boilers used for various purposes. The main function of boilers is to transfer heat produced by the combustion of fuel to water and ultimately to generate steam. Steam produced in a boiler is used for a variety of purposes including space heating, laundry and kitchen.
Safety considerations:
Ability to respond to changing conditions/ steadiness of steam condition / operating parameters – this may decide the type of instrumentation (level switches or level transmitter (single element control or three element control)) To control hazards in a boiler, following methods are used: Process and/ or material substitution, Engineering Controls, Administrative Controls, Personal Protective Equipment Mechanical constraints.
Solar System:
Solar panel:
Solar panel (photovoltaic module or photovoltaic panel) is a packaged, connected assembly of solar cells, also known as photovoltaic cells. The solar panel can be used as a component of a larger photovoltaic system to generate and supply electricity in commercial and residential applications.
Because a single solar panel can produce only a limited amount of power, many installations contain several panels. A photovoltaic system typically includes an array of solar panels, an inverter, and sometimes a battery and interconnection wiring. We, at eMcS, design cost effective solar panel solution in respect of our energy conservation in Bangladesh.
Solar Heater: We also design on solar heater for hot water that can be used for toilet purpose. It will be efficient energy saving solution for that kind of hotel.
PLUMBING SYSTEM:
Making Drawing, design, BOQ and supervision on plumbing work procedure are as follows:
Water Supply, Pumping, Piping and Distribution:
We ensure that the water distribution system meets optimum performance parameters and the functional requirements of the installation. Water requirement is calculated on the basis of occupancy and area served, to plan storage tanks of adequate capacity.
Pumping systems are selected based upon the best efficiency on the duty curve and the quality of water being supplied. In case of piping design, fixture unit method is used in accordance to International Association of Plumbing and Mechanical Officials (IAPMO) or American Society of Sanitary Engineering (ASSE) or BS, and Local standard as BNBC 2020.
We design the water distribution for hot and cold water in accordance with zoning principle to ensure the availability of adequate residual head at user outlet. Pipe material is selected in accordance to the service temperature, pressure and quality of water. All necessary appurtenances such as pressure gauge, temperature gauge, auto air vent and isolation /control valves are provided for efficient monitoring and control of water flow.
Soil and waste disposal piping is designed to ensure high standard of hygiene and reliability and to avoid exposure to occupants and unsanitary conditions. The two pipe drainage system is provided with anti-siphon age pipe to ensure high degree of safely and hygiene and to avoid foul smell entering the piping system and public areas through drains.
We give due design consideration to the placement of the stacks in the shafts and routing of pipes in the bathrooms, toilets, laundry and kitchens to ensure easy access and maintenance of pipes.
The Storm/Rain water drainage system is based on the maximum rainfall intensity for the city. A separate and independent rain water drainage system is provided to collect rain water from roofs, balconies, planters, paved areas, lawns and roads. Rain water is then collected in rainwater harvesting pit with overflow connection to the nearest municipal water drain. In certain cases, the rain water from roofs is collected separately and used for non-domestic purposes such as washing of car parking areas, flushing etc.
Central Hot Water Generation and Supply:
Hot water generators of adequate capacity are designed based upon the hot water demand and ambient temperature of the cold water feed. Hot water generators are suitably located along with ancillaries such as plate heat exchangers, soft water plant, fuel oil supply tank, hot water mixing tank and hot water return pumping system.
Water Treatment:
We plan the water treatment in accordance with the total quantity of water that is required to be treated, the water analysis report of raw/source water and its ultimate purpose. The domestic water qualities parameters are considered in accordance to limit prescribed by the local codes. Various options for water treatment equipment include filtration units, softener Units, dozing Units, pH Correction or RO units.
Sewage Treatment Plant (STP):
STP is designed to ensure that treated effluent characteristics are well within the permissible limits, even under varying flow conditions. The treated, disinfected waste water from STP is stored and reused for flushing, as make up water for cooling towers for air conditioners, DG sets and for external horticulture. The STP comprises of Preliminary treatment unit (Grease trap, bar screen, or equalization tank), biological treatment unit (based upon the treatment technology adopted for the project) and the tertiary treatment unit (Pre-filtration tank, sand filter, activated carbon filter or UV unit).
Air Condition and Ventilation System:
HVAC Design Considerations: eMcS Services offer design solutions for energy conservation-oriented air conditioning systems that are duly compliant with ASHRAE, Bangladesh National Building Code (BNBC) and Energy Conservation Building Code (ECBC).
Sizing HVAC System: We, at eMcS, understand that appropriate sizing of HVAC components is critical for the design of energy efficient HVAC system at optimum cost. Hence, we adopt a systematic approach towards HVAC sizing, taking into consideration various factors such as climate, building configuration, space usage, system zoning and layouts.
Chilled Water Plants: eMcS adopts high efficiency water cooled, low KW/TR chillers on most of the projects. Depending upon their type and capacity, large chillers are specified with variable speed drives. All the chillers are specified with microprocessor-based control system along with chiller manager to monitor all the parameters of the plant. The plant generally consists of energy efficient screw chillers/centrifugal chillers/VFD driven chillers, multiple primary chilled water pumps, secondary chilled water pumps with variable frequency drives, condensing water pumps, FRP cooling towers, VFD driven double skin air handling units with thermal break and variable frequency drive, fan coil units, chilled and condensing water piping, air distribution system, insulation, electrical panels, wiring, control wiring & earthlings.
Efficient Chilled Water Distribution: A significant amount of energy is used to distribute water for space cooling due to year-round cooling loads in most parts of Bangladesh. An efficient and proper design can result in substantial operating and capital savings, and can thus have a significant impact on a building’s total energy consumption. Hence, at eMcS, the thrust is to use variable speed pumping system, a concept in Bangladesh.
Efficient Air Distribution System: While designing the air distribution system, special attention is paid to minimize pressure drops and noise by increasing the duct size, minimizing the bends & elbows and selecting the right type of air outlets. Air distribution design options are closely coordinated with architecture/interior design keeping in view the choice of duct type. Sizing is limited by the availability of the space above false ceilings. At eMcS, duct sizing is done utilizing ducting software known as ‘Easy duct’.
Demand Control Ventilation: High occupancy spaces have huge ventilation requirements resulting in wastage of cooling energy, when the spaces are not fully occupied. Demand control ventilation is used to estimate the number of occupants in a space and reset the ventilation rate from the design occupancy to actual occupancy. Carbon Dioxide (CO2) sensors are the only currently accepted method of demand control ventilation. The benefits of demand control ventilation are reduction in energy conservation, reduced wear & tear of the equipment and confirmed/documented indoor air quality.
Variable Air Volume (VAV) Systems: In office buildings, shops and commercial establishments, we recommend the use of VAV’s to provide the right quantity of cool air required for a specific building zone and at the same time supply different volumes to different zones. The result is that the total supply of cool air varies over the course of the day, depending on the heat gain level in different parts of the building at different times.
Variable Refrigerant Flow (VRF) system: VRF is a popular and cutting edge technology now-a-days. It is used widely because of its space allocation and energy conservation system and some critical indistinguishable features.
The indistinguishable features of VRF technology are –
Better part load efficiency: VRF is capable to modulate its supply capacity to meet most indoors requirement closely integrating with the digital scroll compressor technology. This modulating capability enables the VRF system to offer higher IPLV.
No conversion lost:
Comparing to the traditional inverter drive air-conditioner VRF has eliminated the possibility of lost of energy during the conversion of power signal.
More Economical operation: With higher IPLV, VRF is able to operate with lower power consumption.
Better dehumidifying performance: The continuously operating compressor in the VRF system provides better dehumidifying performance and hence able to reduce the indoor RH to a more desired level. With lower RH in the interior, the growth of the Bacteria and Fungus are inhabited.
Improved Electro Magnetic Compatibility: Unlike variable speed compressors air conditioners, VRF runs at a constant speed throughout the operation, thus there is lower electromagnetic interference. This unique feature reduces the need for expensive electromagnetic suppression electronics required to ensure electromagnetic compatibility.
Long piping design for flexibility: Piping length between outdoor and indoor unit can be extended up to 150 meters. The height between outdoor unit and indoor unit can be extended up to 50 meters. The height difference between indoor units can be as 15 meters. This greatly reduces constraint and offers more flexibility in system design.
Tighter temperature control: The ambient of the outdoor and indoor change frequently and this will affect the indoor cooling and heating load. With VRF system using an improved control algorithm, the temperature is kept closer to the set temperature. Comparing to conventional chilled water system, VRF required far less equipment. Boilers cooling tower are things in the past with AMDS is a better solution for new projects or even retrofit purposes.
Better place utilization:
VRF uses the single outdoor multiple indoors combination. This concept has greatly reduced outdoor units and enhances installation.
Intelligent capacity modulation: The VRF system operates in a steeples capacity modulation ranging from 10-100% .the modulation will closely match the demand capacity whereby contributing higher IPLV.
Rapid Cooling and Heating Capacity: The improved heat-exchanger combining with the better efficiency compressor promotes rapid exchange between refrigerant and air, ensuring set temperature to be achieved faster compared to traditional air-conditioning system.
Wider Operating Range:
VRF system undergo rigorous test to ensure that the system can operate within -15°C to 43°C.
Floor By Floor Installation: The optional outdoor fan with external static pressure of 50 Pa is suitable for short-discharge duct work application. With this feature, an outdoor unit can be placed on each floor, thus allowing installation to be performed floor by floor.
Alarm and Diagnosis System: The VRF system is built in with an alarm system alerting owners or users for abnormal operation, a user-friendly diagnosis system helps to identify the problems, ensuring continuous operation of the VRF system.
Adapts Easier to Any Floor Plan: The wide indoor models can meet the needs of building size and interior design easier, incorporate with the flexible piping design, The VRF system is suitable for most type of floor layout and various applications.
Auto-random restart: After power failure, the VRF system will automatically restart operation base on the last state memory, setting of the unit will not be lost, thus eliminating the needs for re-programming.
Clean Room: In our HVAC design especially for the Pharmaceutical we are equally concerned with the number of contaminants in the air. Solids present in the air are called Particulates or Air-borne particles. They are very minute in size and measured in microns. Sometimes, these particulates are also called Contaminants or Bacteria based on their structure and biology. Two potential sources of contamination for clean rooms are mainly external and internal sources.
Cleanrooms are classified into two types.
- Controlled Area (non-sterile application)
- Critical Controlled Area (sterile or aseptic application)
Differential Pressure (∆P) Across the Areas: Differential pressure refers to two areas that are adjacent but maintain different pressures. One area would have more pressure than the other.
The area which comes closer to the cleanroom or itself cleanroom, we ensure that must be kept under positive pressure than the adjacent area. This ensures that even if the air-borne particles are present in the adjacent area, they can’t enter the cleanroom as air flows from the higher pressure to the lower pressure area.
Relative Humidity (RH)
The relative humidity (RH) is the most critical aspect of the HVAC system, and if it is not controlled, it can directly affect the stability and efficacy of the drug product. In HVAC systems RH is controlled with the help of suitable dehumidifiers.
CO Sensors for Car Park Exhaust: Basement car park ventilation is often provided with exhaust fans to operate during normal occupancy hours. In accordance with ASHRAE Application Handbook, with reduction in vehicle emission, lower ventilation rates may be considered while designing the ventilation system for car parks. Accordingly, we recommend fans to be provided with VFD’s which are actuated through CO Sensors based on the level of CO concentration, thus resulting in substantial energy savings.
Total covered cooling capacity will be calculated follows the standard. This cooling load will be served by roof top chillers plant room or Floor wise modular system. Chiller will be screw compressor type and containing automatic chilled water balancing system to maintain the exact cooling and pressure to the FCUs of the different floors. Central monitoring system will be involved in this central Air Conditioning System. So that from the central control room can observe the any FCUs run/Stop status and can also be controlled on/off of any FCUs. Each FCU have local temperature monitoring system and chilled water modulating system so that the system will be perfectly energy saving system as required by international demand.
We are dedicated for making Design, Drawing, BOQ and Tender document, Tender Evaluation, supervision of Semi-Central and Central Air Condition System. We are also designing clean room air condition design for pharmaceutical, Lab, Operation theater etc. We strictly follow international standard and recommendation as SMACNA, ASHRAE, AHRI (ARI), NFPA, BNBC and BS.
Fire Management System:
FIRE DERECTION: Fire detection and alarm system shall include, but not be limited to automated Heat and Smoke Detectors, Fire Alarms, Control Panel(s), Automatic and Manually Activated Evacuation Alarm Sub-system with Fire Fighter’s Telephone Communications, Automatic and Manually Activated Alarm Initiating and Indicating Devices and Appliances, and other necessary accessories providing a complete and operational life safety system. In Panel LCD display shall indicate all information associated with the fire alarm condition, including the type of alarm point and its location within the protected premises. The system should follow as per NFPA-101, NFPA 72.
Fire Protection System:
We plan the fire-fighting and fire-protection systems in accordance with AHJ (Authority Having Jurisdiction) standards, and/or international standards such as NFPA or FM or Local Standard as BNBC 2020. Water is stored in underground fire reserve tank of the stipulated capacity, and is drawn using electrically driven jockey pumps, fire pumps or sprinkler pumps. All pumps have a separate suction line from the fire suction header. Delivery from the pumps is connected to the respective hydrant and sprinkler system, for which installation control valves with hydraulic alarm are provided in the basement. The sprinkler pump is isolated from the main discharge header by a no-return valve so that the hydrant pump can also act as standby for the sprinkler system.
The pumps are designed to maintain a pressure of 3.5 Kg/Sq.cm at the farthest hydrant. A standby diesel engine driven fire pump of the same capacity is installed as back-up for the electrically operated fire hydrant/sprinkler pump, as per fire regulations. Independent jockey pumps for hydrant and sprinkler system operate intermittently in order to take care of hydraulic losses in the system and maintain the minimum pressure respectively in wet risers and sprinkler system. Fire pumps rating is in accordance with AHJ directive and also caters to future expansion requirement.
Fire Hydrant System of type Class III (NFPA 14) is generally provided as the same conforms to AHJ standards as well. Internal and external standpipe fire hydrant system is provided with landing valve, hose reel, first aid hose reels, complete with instantaneous pattern short gunmetal pipe. Provision of flow switch on riser is made (if required) by the operator for effective zone monitoring. The flow switch is wired to FAP and indicates water flow on hydrant of the identified zone.
Recessed cupboards/fire hydrant cabinets are strategically located for firefighting requirement. Cabinet locations are decided as per confirmation plan, in consultation with the architect.
We locate external hydrants within 2m to 15m from the building, and with a spacing of 45-50 m between them. The hydrants are placed within protective structures to avoid damage from vehicle movement. Fire department connections, capable of directly feeding the ring mains or static fire reserve tanks, are also provided near the main entrance.
Based upon the project requirement and storage hazard, we plan and design the Sprinkler System, which is provided with control valves, flow and tampers switches at suitable locations and connected to control module of the fire alarm system for its monitoring and activation.
For server rooms, EPABX room and other rooms with sensitive equipment, we provide clean agent suppression system designed in accordance to NFPA 2001.
We design and install the CO2 extinguishing system comprising of cylinder, piping and nozzle for LT Panel and other electrical panels as per project requirement. Portable fire extinguishers of water (gas pressure), carbon-dioxide and foam type are provided as first aid fire extinguishing appliances.
For fire-protection of the helipad, low expansion AFFF (Aqueous Film Forming Foam) unit/system is provided, in compliance with NFPA 418. Heliport foam fire protection utilizes the water supply available from the standpipe system.
Kitchen hood fire protection system is generally specified by the facility planner and included in scope of the kitchen equipment supplier. However, all necessary interfaces with FAP and fuel shut off annunciation are included in our design scope.
We are dedicated for Designing, Drawing, BOQ, Tender Evaluation and supervision of Fire Management System for Large or high rise residential and commercial building. International Standard Follows: NFPA-2002, BS-2000 and BNBC-2020.
CCTV,PA,LAN,BMA/IT System:
CCTV Surveillance System in this project comply With Integrated Security System. Basically CCTV Surveillance System for this project means Integrated Security System. Prime objective of the Integrated Security System is to keep continuous observation at internal and external areas of the building through Security Management System (SMS), CCTV System, Intercom/Paging System, Access Control system so that in case of any of occurrence the spot of occurrence can be located precisely and the security personnel can take proper care of the situations. Also the incidents are recorded in Digital Video Recording System and stored up to 30 Days within the DVR internal HDD in order to review the incidents of any particular place and time. Later this information can be stored in external storage media (such as CD/DVD) for future reference. Thus by above means the building shall be safe for the tenant and the occupants. In case if the Culprit manage to escape from the building, security check the CCTV camera shall be able to find out the Culprit. Each entering and exit people’s photo will be captured by C.C. camera in the main entry area. We are dedicated for making Design, Drawing, BOQ, Tender Evaluation of CCTV system for the modern building. Design ensures the CCTV coverage area for the security purpose.
Panic Button System:
Panic alarm system will be provided in this building. If any threat arise by any culprit in front of any floor reception, then the desk person just press the hidden panic button as well as, it will automatically inform to security central panel and adjusting C.C. Camera will focus it. Then the security people see it by the DVR camera and take necessary action in respective floor. This system prevents entering the unauthorized person to this Building. Only the person who carry their chip type identity card, can enter to this building, if any other person able to enter after getting proper identification/information to security people or receptionist.
Building Integration System:
All system’s main information will be passed to this central control panel. Then all information can be stored up or printed out and also can be broad cast to internet. So that from the other area any owner can be seen images or building status through dedicated broad band internet line.
Building Automation and Control System:
Designing on Building Automation system for the ultra-modern building where high security and energy saving involved. Also researching and making on controller circuit for controlling the system (e.g. Air Condition unit auto ON/OFF by sensing room temperature, Light ON/OFF by sensing daylight, Main switch ON/OFF by sensing any error of the phase or over voltage or lower voltage or any short circuit or over current etc.
MEP Scope of Services:
- Electrical System:
- Electrical load calculation on area basis.
- Electrical riser/punch requirement and sizing.
- Electrical distribution board location.
- Horizontal cable tray and bus bur trunk (BBT) concept layout.
- Fittings and fixture Layout with conduiting.
- Electrical circuit diagram of FDB, DB and SDB.
- Single line diagram of substation and generator.
- Typical erthing system drawing of substation and generator.
- System erthing drawing.
- Accent lighting.
- Solar panel load calculation and location.
- Uninterrupted power supply (UPS) system.
Sub-station, generator, meter room location and sizing.
Generator, Sub-station & Meter Room
- Remote fuel reservoir, full/partial power calculation.
Plumbing System:
- Plumbing water demand calculation.
- Underground Raw Water Tank (UGRWT), Treated Water Tank (TWT),
- Sewerage Treatment Plant (STP), Rain Water Harvesting tank (RWHT),
- Overhead Water Tank (OHT) size and location.
- Pump room size and location.
- Details piping layout.
- Basement sump pit location & size.
- Toilet/Gas/Rain punch or riser size & location.
- Total water system flow diagram.
- Rain water harvesting layout.
- Source of water deep tube well/city connection.
Air Condition and Ventilation System:
- Load calculation for air condition.
- Indoor unit and ducting layout.
- Basement ventilation punches size and location.
- Ventilation duct & fan location.
- Jet fan location & flow direction.
- Generator & Substation supply and exhaust duct & fan location.
- Typical floor punch & FCU location.
- Fresh air and exhaust air ducting.
Fire Detection System:
- Addressable fire alarm system layout.
- Detection (smoke, heat, multi and beam) selection based on area.
- Detector coverage area.
- Automatic actuated integrating device (manual call point location).
- Visual notification (horn-strobe or speaker-strobe location).
- Notification appliance circuit layout or signaling line circuit.
- Fire alarm panel details.
CCTV (backbone) and Sound (backbone) System:
- Control room size and location.
- Low voltage Riser/punch size and location.
- Cable tray route for low voltage services.
- Distribution board location.
- Internal electrification works.
Utility Services:
- Central Hot water Distribution
- Hot water Distribution
- Steam Distribution
- Compress Air Plan
- Air Line Distribution line System.