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Standard 55 Navigation menu VideoTANTRON—55mm Europe standard 2 6'' touch screen（2019） The ASHRAE 55 standard is used for specifying the combinations of factors that produce thermally comfortable environmental conditions that will be acceptable to a majority of the occupants. It is a thermal comfort standard that is referenced by many green building rating schemes and is used for both commercial and residential spaces. NFPA 55 facilitates protection from physiological, over-pressurization, explosive, and flammability hazards associated with compressed gases and cryogenic fluids. UV sterilizers that meet NSF/ANSI Standard 55 Class A are required to provide a UV dose in excess of 40 mJ/cm2 over the entire life of the UV lamp, to have a UV dose monitoring system, and to have a flow restrictor that ensures the rated flow capacity is not exceeded. Standard 55 specifies conditions for acceptable thermal environments and is intended for use in design, operation, and commissioning of buildings and other occupied spaces. ANSI/ASHRAE Standard is the latest edition of Standard The edition combines Standard and the ten approved and published addenda to the edition into one easy-to-use, consolidat ed standard. The stan- dard outlines conditions in which a specified fraction of the occupants will find the environment thermally acceptable.
Energy Modeling Best Practices and Applications. Fundamentals and Application of Standard Home Technical Resources Bookstore. Share This. Purchase For thermal comfort—this is the standard.
If these requirements are met and the environmental conditions inside the building fall within the indicated ranges, then compliance is achieved.
For humidity ratios above 0. Compliance is achieved if the conditions provide thermal neutrality, measured as falling between The section sets provisions for increasing the upper air temperature limit at elevated air speeds above 0.
The methodology is based on the SET Standard Effective Temperature model, which provides a way to assign an effective temperature at a standard metabolic rate, and clothing insulation values to compare thermal sensations experienced at a range of thermal conditions.
Radiant temperature asymmetry between ceiling and floor, and air and walls must be limited to reduce discomfort.
To reduce draft risk at temperatures below When occupants do not have control over the cyclical variation or drifts in indoor environmental conditions, the conditions within this section must be met.
Operative temperatures may not fluctuate more than 1. For this model the standard provides a graph of acceptable indoor temperature limits at prevailing mean outdoor temperatures a mean of the daily mean outdoor temperatures of the previous 7—30 days.
An accompanying table lists provisions for higher operative temperatures at air speeds above 0. The graph is valid for prevailing mean temperatures between 10— This section of the standard is applicable for the design of buildings.
All of the building systems must be designed to maintain the occupied spaces at the indoor conditions specified by one of the described evaluation methods at design conditions.
The systems must be able to maintain these conditions within the expected range of indoor and outdoor operating conditions.
To demonstrate compliance the following must be documented, where applicable. Sample documentation is provided in Informative Appendix J. Generally, the evaluation of comfort in existing buildings can be performed from two perspectives: from occupant satisfaction survey and physical environmental measurements.
Indoor thermal comfort can be determined from the responses of the occupant survey. The survey shall be distributed to the entire occupancy or representative part of the occupancy.
If that number is between 20 and 45, the minimum number of responses is When the number is under 20, at least 16 must reply for the survey to make the survey representative.
For satisfaction surveys, the thermal satisfaction scale shall end with choices: "very satisfied" and "very dissatisfied", and, also, the occupants should be allowed to explain their dissatisfaction by answering an open-ended question.
As for point-in-time surveys, the survey should be solicited during the time of occupancy, and the satisfaction scale ought to be continuous.
There should be at least seven points on the scale ending with "very acceptable" and "very unacceptable. For mechanically conditioned spaces, the PMV-based comfort zone has to be determined, which includes measuring and recording the metabolic activity and clothing insulation.
The comfort zone boundaries must be adjusted to the air movements, and the zone conditions should be adjusted to avoid local thermal discomfort. For occupant-controlled naturally conditioned space, the adaptive model shall be used to determine the thermal comfort boundaries.
For such spaces, the indoor and outdoor air temperature and mean radiant temperature and the air speed need to be measured. The measurement locations should be where the occupants are expected to spend time in.
If there are multiple such locations, the measurement can be performed at a representative location. For seating occupants, the air temperature and air speed measurements shall be taken at heights of 0.
The heights need to be adjusted for standing persons. The standard suggests that the time of measurements should last two or more hours long, and it should also be a representative time of the year for this specific building.
Measuring time step should be no more than five minutes for air temperature, mean radiant temperature, and humidity, and no more than three minutes for the air speed.
In order to achieve acceptable results, the standard also suggests the minimum equipment accuracy based the current industry standard.
When extracting environmental data from the Building Administration System, one should evaluate the location, height, and time step of the sensors based on the previous suggestion.
To evaluate the probability of satisfaction from satisfaction surveys, the standard suggests dividing the number of the votes falling between "just satisfied" and "very satisfied" by the total number of votes in that questions.
In this project, we will explore the design of an HVAC system for a large theater room, with the goal of improving the thermal comfort of the occupants inside.
The main design decisions we will investigate in this particular analysis are the inlet and outlet ventilation locations.
From this analysis, we will design a second, better configuration where we address the identified flow issues.
A follow-up analysis is then performed on the second, improved design configuration and the total improvements are highlighted.
In the first design, the inlets are placed on top and no diffusers were used. This design has critical flaws which will be revealed in the post-processing images of the CFD simulation results.
CFD simulation allows us to analyze the detailed aspects of both designs by visualizing the airf low velocity and direction, the a ir temperature, and the e ffective draft temperature EDT , which combines the velocity and temperature information.
Very strong drafts can be observed in the occupied region of the first design. The f low from the inlets is very poorly distributed through space, and the f low around the occupants is dominated by small-scale erratic vortices.
The second design, however, reveals no strong drafts near occupants and a relatively large convection current renewing air near the occupied area.
The simulation revealed large temperature differences throughout the occupied region, with s ome occupants getting exposed to very cold air.
The thermal efficiency is also poor, as evidenced by relatively warm air. In the second configuration, all occupants are within the temperature comfort region, and the air temperature shows greater stratification.
On the other hand, n o discomfort can be observed for any occupant location, and o ccupants are well within the comfort limits.
The simulation results reveal significant flaws in the first design, including strong drafts near the occupants, large differences in temperature across occupants, with many occupants seated outside of the thermal comfort zone.
The area directly underneath the inlets is particularly thermally uncomfortable. The second design clearly shows a significant improvement; the air patterns are optimized and no drafts or large temperature gradients can be seen near the occupants.
Overall, the above post-processing images reveal vast differences between the two designs, with the second one being clearly superior in terms of thermal comfort.
With a few simple modifications to the original ventilation system design, the overall thermal comfort was improved dramatically.