Presentation on theme: "Imola – June, 19 2013 - 01 HVAC & WATER Application note."— Presentation transcript:
Imola – June, HVAC & WATER Application note
HVAC & WATER HVAC Heating, Ventilation and Air-Conditioning (HVAC) is all about efficiency: Room temperatures need to be maintained at optimum levels to achieve the best occupant confort. It is essential to consider how hit targets in reducing costs and carbon dioxide (CO 2 ) levels.
HVAC & WATER WATER - PUMP An operating pump will normally consume more power than the hydraulic circuit requires and it is usually positioned in unconfortable site: It is essential to consider how achieve targets in reducing power consumption, costs and CO 2 levels. Maintenance time and costs need to be reduced in order to avoid long plant standstill.
HVAC & WATER - Why VFD flow control? HVAC & WATER systems are designed to operate under the most extreme conditions and, HVAC typically, in the “worst case” situations that the system will encounter Most of the time they have excess capacity
HVAC & WATER - Why VFD flow control? Problems of traditional flow control Low system efficiency Difficult in regulation Electromechanical stress Noise due to mechanical resonance High starting current Big supply cable section or cable number Maintenance cost and time
HVAC & WATER - Why VFD flow control? Reducing the capacity of the systems when full capacity is not required provides significant energy savings without sacrificing system performance VFD Flow control
HVAC & WATER Return Fan Supply Fan Primary cold/Chilled Water Pumps Condensor Water Pump Cooling Tower Fans Secondary Hot/Chilled Water Pumps
HVAC & WATER - Characteristic Pump Curve System Curve Operating Point
HVAC & WATER - Traditional throttling flow control Power Flow x Pressure New Power required WASTED Power Power to load P Pressure drop
HVAC & WATER - VFD flow control VFD avoids the pressure drop by controlling the speed of the pump
HVAC & WATER - VFD flow control P «VFD c.» Power required «Throttle control» Power required
HVAC & WATER - VFD flow control Proportional Integral Derivative function (PID) The sum of these three actions is used to adjust the process via a control element such as the position of a control valve or the power supply of a heating element. PID controllers attempts to correct the error between a measured process variable and a desired set-point by calculation and then outputting a corrective action that can adjust the process accordingly.
HVAC & WATER - VFD flow control Controller Detector Feedback value Controlled Variable Actuating Signal Motor freq. Comparator Σ System Set point 0-10VDC or 4-20mA signal The target value or Set-point has to be set by user. This could be the desired pressure, flow, temperature, vacuum, etc. E.g.: this reference is the measure of how much fluid is required to be sent to the wastewater pipeline. Feedback value Set point Motor & Pump VSD Transducer Pump outlet
HVAC & WATER - VFD flow control The standard «ready-to-install» IP54 SINUS PENTA solution is particularly suited to HVAC & WATER applications: High degree of protection against dust and water sprays Ability to mount without additional enclosures and ventilation PID functions for automatic control Built-in EMC filter Onboard communications allows control and monitoring
HVAC & WATER - VFD flow control The standard «ready-to-install» IP54 SINUS PENTA solution is particularly suited to HVAC & WATER applications: Extensive I/O with internal comparator functions Fire Mode function for extended operation in critical periods Speed Search function to start on a rotating load Real Time Clock (RTC) function to adjust confort to demands that change over the week Multipump function Robustness and reliability
HVAC - SINUS PENTA advantages AIR HANDLER Reduce energy costs and CO 2 emissions Variable torque load characteristics use less energy as speed is reduced Reduce supply demand Drives reduce motor starting current up to 10 times Reduce noise in buildings Airflow noise decreases by eliminating starts/stops and optimising flow rates Reduce shock and vibration Drive avoids running at speed near system resonant frequency and provides controlled acceleration Increased life of motor belts Drives provide low torque starts reducing stress on belts, pulleys and keys
HVAC - SINUS PENTA advantages WATER CONDENSER CHILLER Reduce energy consumption Provide improved efficiency and reduce energy requirements Reduce CO 2 emissions Due to the energy savings Provide continuous operation Restart a spinning motor after momentary power loss
HVAC - SINUS PENTA advantages COOLING TOWER FAN Energy savings and reduce energy costs Motor use less energy as speed is reduced Reduce CO 2 emissions Due to the reduce energy consumption Reduce maintenance requirements and reduce operating costs Robust constructions and energy efficient
WATER - SINUS PENTA advantages PUMP Reduce energy costs and CO 2 emissions Variable torque load characteristics use less energy as speed is reduced Reduce demand charges Drives reduce motor starting current up to 10 times Control of pressure of flow using PID The drive can optimize the pressure flow, and its linearity variations, with a single pressure transducer Wide power range for different pump sizes Network communications Support all major protocols Prevention of water hammer, pipe stress, valve, pump seals and cavitation Extends the life of the entire system
WATER - MULTIPUMP application overview Controls a multi-pump pumping system (up to 5 pumps) One pump is the speed-controlled master and the other pumps are variable speed or fixed speed slaves Multi-Master mode Connection using I/O or Modbus Automatic balancing of operating hours of all pump sets Elimination of water hammer
WATER - MULTIPUMP: Fixed Speed Slaves (FSS) The Master pump operates to ensure the system fine-tuning. The slave pumps are started up/stopped based on the criteria below: 1.Percentage of the working power required for the master pump (allowing optimum performance of the plant). 2.Maximum allowable adjusting error. 3.Maximum difference among the working time of each available pump. The power ratio of the connected pumps must meet one of the following requirements: 1.All pumps must have the same power ratings. 2.The connected pumps can have different power ratings, provided that each pump with the greatest power rating is matched with lower-rated pumps that, if combined, have power ratings equal to or higher than the former pump. 3.The power rating of the master pump must be higher than/equal to the power rating of the lower-rated pump.
WATER - MULTIPUMP: Fixed Speed Slaves (FSS) Soft-Starter ASAB Basic diagram for a fixed-speed plant including 4 slave devices and 1 MP Penta drive controlling the system in analog mode. PENTA MULTIPUMP SOFTWARE
WATER - MULTIPUMP: Fixed Speed Slaves (FSS)
WATER - MULTIPUMP: Variable Speed Slaves (VSS) The slave pumps and the master pump are started/stopped based on the following criteria: 1.Percentage of the working power required for the master pump (allowing optimum performance of the plant). 2.Maximum allowable adjusting error. 3.Maximum difference among the working time of each available pump. All the connected pumps must have the same power ratings.
WATER - MULTIPUMP: Variable Speed Slaves (VSS) PENTA MULTIPUMP SOFTWARE Modbus MASTER MODBUS RTU Modbus SLAVE MULTIMASTER FUNCTION PENTA DRIVE The diagram above shows a configuration for a variable-speed multipump system, serial communications and Multimaster function. PENTA DRIVE
WATER - MULTIPUMP: Variable Speed Slaves (VSS)
HVAC & WATER: Variable Air Volume (VAV) Supply Fan
HVAC & WATER: Supply Fan - Temperature
HVAC & WATER: Supply Fan - Smoke Extraction
HVAC & WATER: Stairwell Pressurization Fan Drive Fan Tp Fire mode function
HVAC & WATER: Parking Garage Ventilation Fan
HVAC & WATER: Fume Hood Fan Fume Hood FanDrive Fan
HVAC & WATER: Cooling Tower Fan Temperature Sensor Cooling Tower Fan Drive Cooling Tower Cells Chiller Condenser WaterPump
HVAC & WATER: Condenser Water Pump Flow Sensor Cooling Tower Chiller Condenser Water Pump Drive Strainer