eYc Industry Application-Measuring Transmitter for HVAC Energy Saving System in Smart Building

eYc Industry Application-Measuring Transmitter for HVAC Energy Saving System in Smart Building

eYc Industry Application-Measuring Transmitter for HVAC Energy Saving System in Smart Building

Excessive use of energy leads to the impact of climate change and the greenhouse effect. Energy conservation has become the main topic of today's architectural design. There are many high-rise buildings in cities around the world now, in order to improve huge energy consumption, many office buildings have been planned as building automation systems during construction. 
The purpose of reducing equipment energy consumption and costs is to manage energy use in the building.

According to the Industrial Assessment Centers (IACs) database, the average energy saving potential of SMEs is 8.03%, of which HVAC accounts for about 50% of office building energy consumption, including ventilation, water supply, and drainage, and safety precautions, Parking lot management, etc., are also used to control indoor temperature and humidity to maintain appropriate air quality, and improve the comfort of the office environment. Therefore, doing a good HVAC design is indeed the best way for SMEs to reduce operating costs.

Early office buildings used the building automation system BAS (Building Automation System), but each system lacked a shared management interface, and some equipment could not be controlled to achieve intelligence and automation; or basic operations such as pressure and temperature transmitter and switches were used as basic Control, so it is difficult to effectively manage energy facilities and control budgets.

On the overall system, electricity accounts for two-thirds of the total energy consumption, of which lighting, office equipment, and HVAC account for 90%. 
In order to effectively control energy, office buildings have gradually used building energy management (BEMS) to do Energy control is to integrate HVAC with other systems to  control a number of equipment in the building, such as pumps,, fans, valves, regulating gates, compressors, etc., and integrate the functions that were separated. 

For example, temperature and humidity or air volume can be controlled in different areas of the building. A well-designed BEMS and equipment are equipped with a high-accuracy, long-term stability, transmitter for monitoring and control. Every year save 5% to 20% on energy costs.

Application:
HVAC mainly controls and properly adjusts the temperature, humidity, air circulation and air cleanliness in the building. The transmitter installed in the HVAC system measures the indoor environment mainly to obtain more detailed parameters for the operation of the equipment. Such as temperature, humidity, CO2, PPM, pressure, air velocity, gas flow, etc., the measured values are transmitted to the data collector to the central control room through digital or analog signals, and the room is controlled by computer monitoring. 
Environmental control of grasping the equipment operation status and also can collect data and analyze the environment in combination with the cloud system, so as to effectively control the indoor environment.

The following are recommended products:
Temperature & Humidity Transmitter
Air Velocity Transmitter
eYc THS17 Temperature and humidity transmitter 
(Digital / Analog) 
eYc THS07 Temperature & Humidity Transmitter for Probe Type
eYc THG03 CO2 Temperature & Humidity Transmitter / Indoor type 
eYc THR23 Temperature & Humidity Transmitter for indoor 
eYc THS30X Series Multifunction Temperature & Humidity Transmitter (Indoor/Duct/Remote/Outdoor)
eYc THS30X Series Multifunction Temperature & Humidity Transmitter (Indoor/Duct/Remote/Outdoor)
eYc FTS34/35 Air Velocity Transmitter
eYc AFMT Average Flow Measuring Tube ( Pitot tube )
eYc FTS14 Air Velocity Transmitter
eYc FTS07 Hot wire air velocity transmitter
eYc AFMS-160 S-type Pitot tube




Differential Pressure Transmitter
Gas ( CO / CO2 ) / Air Quality
eYc PMD33 Differential Pressure Transmitter
eYc PHM33 Differential Pressure Transmitter

eYc TGP03_THP03 Multifunction PM2.5 Indoor Air Quality Monitor
eYc GS23 CO2 Transmitter / Indoor type
eYc GS43/44 CO2 Transmitter Indoor / Duct Type


Example of the Water-cooled chillers and the HVAC air supply system:

Water-cooled chillers measurement items are as follows
1. Temperature measurement of main unit water supply and return water, 2. Power consumption (Amp) and main unit load (RLA%) of the main unit during operation, 3. Main unit water level measurement (GPM)

The following formula can be used to calculate the freezing capacity that can be produced when the air conditioner is running:

Q = m x Cp x ΔT

Q: Change in enthalpy (ΔH), m: Mass, Cp: Specific heat, ΔT: Change in temperature (Final Temperature – Initial Temperature = ΔT)

Used for air conditioning, the measurement transmitter will make the control system for temperature, humidity, air cleanliness, and air circulation, adjust the cooling energy output of the air conditioner, and will directly affect the user feeling (such as people, things, important machinery, and equipment) .

eYc Central Air-conditioning System Flow Diagram
The air supply system is the closest to the user in HVAC. A good air supply system can provide users with a comfortable and energy-saving environment, but it is prone to occur due to the air supply system.
 1. Uneven room temperature
 2. The air is not easy to adjust 
And other problems cause additional consumption too much energy prevents efficient use of resources.

At this time, it will be equipped with temperature and humidity transmitter, flow-switches, real-time monitoring instruments, etc. Integrated control and limit demand or load/unload control. 
Adjusting temperature or ventilation control according to demand can effectively solve excessive energy loss, etc. Achieve effective energy-saving and control the optimization of startup and shutdown.

eYc Schematic diagram of transmitter in office building HVAC
HVAC systems such as cooling towers, condensers, boilers, variable air volume boxes, piping systems, air filters, etc., will use a large number of transmitters, of which temperature, humidity, and pressure transmitter are the most commonly used.
The temperature transmitter is mainly used to measure indoor temperature, pipe, outdoor, and water(such as the water cycle of a cooling tower). 
The office environment will be set with temperature and humidity, gas transmitter, and air quality monitors to measure the office environment to maintain a comfortable temperature (such as the most comfortable of human feeling  is 19 ° C ~ 24 ° C, and the most pleasant indoor temperature is 18 ° C ~ 25 ° C), 
In the ventilation ducts will be set such as flow, pressure, temperature and humidity  transmitter to monitor air circulation to maintain indoor air quality.

In order to save energy and improve the design of the HVAC system, many engineering projects will choose Taiwan eYc transmitters.  
Its advantages include many physical quantities in terms of functions, economical, high accuracy, long-term stability, low power consumption, durable, and optional ISO/IEC 17025 (TAF/ILAC) calibration report.
eYc differential pressure transmitter uses a silicon chip on differential pressure module of MEMS integration technology, low-pressure monitoring, high pressure bearable, measuring range up to ± 50 ... ± 2500 pa, ambient temperature up to-20... + 80°C. 
The temperature and humidity transmitter adopts imported industrial-grade MEMS semiconductor sensor. It is environmentally friendly, high stability, fast response, temperature compensation, and linear correction up to + 0 ... + 100% RH. 
Air velocity transmitter with temperature compensation and linear adjustment, the measurement range can reach 40 m / s, and the minimum measurement range can reach 0.2 m / s. 
The above can be varied or customized according to the different design conditions of each building.

Conclusion
The HVAC system is designed to control energy from inside the building through physical measurement and works with the Building Energy Management System (BEMS). In addition to controlling various equipment in the building and integrating the original separate systems, the focus is to grasp the operational parameters immediately and plan the most appropriate operating mechanism, which can save 5 to 20 % of the energy cost.
It can be seen that in the design thinking of the smart building, a well-designed BEMS combined with the HVAC and the use of long-term stability, high accuracy, and the durable transmitter as measuring, can achieve effective planning of equipment and  energy saving.