HONEYWELL 621-9939 Module

New original DCS Module 621-9939 In Stock

Description 

The heating capacity required for a building depends on thedesign temperature, the quantity of outdoor air used, and thephysical activity of the occupants. Prevailing winds affect therate of heat loss and the degree of infiltration. The heatingsystem must be sized to heat the building at the coldest outdoortemperature the building is likely to experience (outdoor designtemperature). Infiltration is the process by which outdoor air enters abuilding through walls, cracks around doors and windows, andopen doors due to the difference between indoor and outdoorair pressures. The pressure differential is the result oftemperature difference and air intake or exhaust caused by fanoperation. Heat loss due to infiltration is a function oftemperature difference and volume of air moved. Exfiltrationis the process by which air leaves a building (e.g., throughwalls and cracks around doors and windows) and carries heatwith it. Infiltration and exfiltration can occur at the same time.Ventilation brings in fresh outdoor air that may requireheating. As with heat loss from infiltration and exfiltration,heat loss from ventilation is a function of the temperaturedifference and the volume of air brought into the building orexhausted.

About Us

Jak PLC for many years, is a professionalengaged in large-scale system (distributed control system, programmablecontroller, redundant fault-tolerant control systems, robot control system,large servo control system is the central feeding system plastic moldingauxiliary equipment and automation of whole plant planning) imported automationsystem such as spare parts, modules, sales and system integration of high-techenterprises. The company is equipped with professional technicians to providecustomers with better service.

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Wedouble check and test the goods before shipping, we have experienced and   dedicated technical staff for inspectingevery module and card as to ensure the end user use them perfectly without anyprobelm and added trouble.

Wehelp customer save cost with high quality and comparative price. We care aboutwhat customer care, and see the end user's benefits as important, we would liketo build long-term business relationship with customers.