31 results about "Air changes per hour" patented technology

A UV air cleaning and disinfecting system has an enclosed chassis with an inlet / outlet surface panel on one planar side thereof, and the chassis is mounted in the space behind a drop ceiling with its surface panel coplanar with the ceiling surface and facing into the room space. The surface panel has a pair of inlet vent arrays on opposite longitudinal sides of the surface panel from each other, and a pair of outlet vent arrays on opposite latitudinal sides of the surface panel from each other. Arranged in the chassis are an air blower unit and an array of UV lamps. The positioning of the inlet and outlet vent arrays establish four mutually circulating air streams in a four-leaf-clover pattern in the room space, which obtains a high-efficiency throughput of air handled by the system. The UV lamp array is arranged longitudinally across the chassis between the inlet ventsat a lower elevational position of the chassis. A pair of air filters is arranged at intake chambers separated by UV-blocking baffles at opposite longitudinal sides of the main chamber housing the air blower in the center of the chassis at an upper elevational position from the array of UV lamps. The upward and downward movement of the air through the filters and over the UV lamps toward the center causes swirling movements which enhance the exposure of pathogens in the air to UV radiation exposure. The surface panel is formed with a series of cascading door sections to allow wide access across the center of the chassis for maintenance of the UV lamps, with a first door section connected to an interlock switch for cutting off electrical power to the UV lamps and fan when the first door section is opened. The UV-blocking baffles have an angled shape and slits at an upper flange thereof covered with fused silica shields. The system's chassis is dimensioned to fit on ceiling rails spaced at standard 4 foot length and 2 foot width intervals. The system can provide 99% or higher inactivation of pathogens in the air with 2 to 7 or more air changes per hour for standard sized rooms.

A method of pest control which includes heating the affected area to a temperature which is lethal for the pests being exterminated, and maintaining this elevated temperature in the zone for a predetermined period of time. The treatment is undertaken after determining the air flow parameters for the treatment zone, so as to be able to determine the CFM requirements for achieving a requisite air flow rate of between 0.5 and 70 air changes per hour in the treatment zone. Heated air is introduced to the treatment zone at the requisite air flow rate and at an initial temperature of at least about 240° F., with the temperature in the treatment zone being elevated at a predetermined rate until the air temperature reaches a predetermined set point. Once the predetermined set point temperature is reached within the treatment zone, the introduced heated air is adjusted to an eradication temperature and maintained in such a condition for a predetermined period of time sufficient to eradicate respective pests within the treatment zone.

A refrigeration based air handling system design process for significant energy and cost savings in cleanroom and other applications requiring large air change rates is presented. The process utilizes a by pass around the air conditioning system, the ratio of bypass to air conditioning flow being such that minimal or no reheat of the air is required for applications having relative humidity (RH) control requirements and with RH control being achieved via cooling. If dehumidification is achieved by adsorptive processes, then the by pass ratio is varied so as to minimize cooling of the heated dry air. In other non relative humidity control applications the bypass is varied to minimize the air conditioning flow, thereby decreasing cost, but by using optimum cooling coil velocities in a manner such that system energy for airflow is minimized. The energy and cost savings achieved by this process vary between 65% to 15% depending on the Class of the cleanroom and / or on the number of air changes per hour required.

The invention discloses an intermittent ventilation method of determining a VOC (volatile organic compound) emission characteristic parameter of a building material. The method comprises the steps ofkeeping a space that is relatively constant in temperature, relative humidity, ventilation rate and wind speed by using an environmental chamber, putting the building material to be determined in theenvironmental chamber, determining a dynamic VOC concentration change situation in a closed state and a ventilation state for a building material sample in a closed emission mode and a ventilation emission mode, recording a VOC equilibrium concentration in each closed state, and exhausted VOC mass in the ventilation state, establishing a VOC mass conservation equation, substituting experimental data of 4-6 closed-ventilation emission cycles into the VOC mass conservation equation for linear fitting, and obtaining a separation factor and an initial emission concentration describing a VOC emission characteristic of the building material according to a slope and an intercept of a fitting straight line, wherein the ventilation state and the closed state of the environmental chamber can be switched over by opening and closing an air inlet and an exhaust outlet.

The invention discloses an air quantity control method and device for a clean workshop. The clean workshop comprises a clean space. The method comprises the following steps: the running state of the clean space is obtained, and the running state comprises a dynamic state and a static state; when the clean space is in the dynamic state, a real-time dust generation equivalent weight in the clean space is obtained on the basis of the running state of process equipment in the clean space and the number of personnel; a target ventilation rate corresponding to the clean space is obtained on the basis of the real-time dust generation equivalent weight; a target total air quantity needed by the clean space is obtained on the basis of the target ventilation rate; an air supply quantity corresponding to the clean space is dynamically adjusted according to an air quantity change speed corresponding to a preset first ventilation rate; and air supply is carried out on the clean space according to the air supply quantity, until a target total air quantity is reached. The air quantity control method and device for the clean workshop are capable of dynamically adjusting the air supply quantity inthe clean space as needed, effectively guaranteeing pressure difference in the clean space, and reducing the redundant air quantity to reduce the energy consumption.

An apparatus and method controls an environmental control system to maintain a differential pressure between a room and one or more adjacent areas by (1) determining a differential pressure error based on the differential pressure and a differential pressure set point using a proportional-integral-derivative (PID) controller; (2) increasing an air change per hour set point whenever one or more first parameters are satisfied; (3) decreasing the air change per hour set point whenever one or more second parameters are satisfied; and (4) sending one or more control signals to the environmental control system that maintain the differential pressure between the room and the one or more adjacent areas by adjusting: (a) the leading airflow to be approximately equal to the air flow change set point multiplied by a volume of the room divided by 60, and (b) the tracking airflow to maintain a volume differential set point.

The invention discloses a determination method of indoor particle sedimentation parameters based on dynamic mass balance, and belongs to the field of environmental science. The method includes the following steps: firstly, selecting a to-be-measured room, and arranging dust particle counters inside and outside the to-be-measured room as measuring instruments for indoor and outdoor particles; secondly, starting the measuring instruments for synchronous determination; thirdly, obtaining the parameters of indoor and outdoor particle concentration ratios, ventilation times, sedimentation rates andpermeability factors through the dust particle counters and data analysis; and finally, establishing a mass balance equation based on the dynamic balance of particles and calculating to obtain a sedimentation rate Kcomp and permeability P of the to-be-measured room by using a least square method. The determination method of the indoor particle sedimentation parameters based on the dynamic mass balance determines the permeability and the sedimentation rate by using the mass balance equation, which can better understand indoor particle dynamics and behavior under natural ventilation conditionsand helps to analyze the particle size distribution of the indoor particles.

The invention relates to a control method of a ventilation system and the ventilation system using the control method. The control method comprises the steps that an exhaust air speed target value of each room is determined based on the size of each room, the set ventilation frequency and the exhaust outlet area of an exhaust pipeline; based on the exhaust air speed target value, an air supply air speed target value of each room is determined; the exhaust air speed and the air supply speed of each room are detected; the measured exhaust air speed and the measured air supply speed are compared with the corresponding exhaust air speed target value and the corresponding air supply speed target value respectively; and based on the comparison result, the rotating speed of an exhaust fan and the rotating speed of an air supply fan are controlled, the opening degree of an exhaust air valve and the opening degree of an air supply valve corresponding to each room are controlled, the exhaust air speed is larger than or equal to the exhaust air speed target value, the air supply speed is larger than or equal to the air supply speed target value, and the exhaust air speed is larger than the air supply speed. The control method of the ventilation system can be controlled based on the set ventilation frequency and the set pressure difference, and the control precision is high.

A refrigeration based air handling system design process for significant energy and cost savings in cleanroom and other applications requiring large air change rates is presented. The process utilizes a by pass around the air conditioning system, the ratio of bypass to air conditioning flow being such that minimal or no reheat of the air is required for applications having relative humidity (RH) control requirements and with RH control being achieved via cooling. If dehumidification is achieved by adsorptive processes, then the by pass ratio is varied so as to minimize cooling of the heated dry air. In other non relative humidity control applications the bypass is varied to minimize the air conditioning flow, thereby decreasing cost, but by using optimum cooling coil velocities in a manner such that system energy for airflow is minimized. The energy and cost savings achieved by this process vary between 65% to 15% depending on the Class of the cleanroom and / or on the number of air changes per hour required.

The invention provides a stratified air-conditioning system serving high and large space of a railway station and an energy-saving method of the stratified air-conditioning system. The energy-saving method provides the stratified air-conditioning system which comprises vents, air return inlets, air outlets and air inlets, wherein the air return inlets are used with the vents, and the air outlets and the air inlets are used for indoor ventilation. The horizontal plane of the vents is a stratifying plane, the high and large space is divided into a non-air-conditioning area and an air-conditioning area which are above and below the horizontal plane respectively, the vents are used for delivering cool air to the air-conditioning area, the air outlets and the air inlets are positioned in the non-air-conditioning area, ventilation is achieved by means of combined use of the air outlets and the air inlets, and ventilation times obtained by means of combined use of the air outlets and the air inlets are determined according to the formula: alpha1n=(12.9n<2>+20.1n+2746) / 100, wherein the alpha1n refers to energy-saving rate, and the n refers to ventilation times per hour. The stratified air-conditioning system and the energy-saving method have the advantages that the specific quantitative change relation between the indoor ventilation times and the energy-saving rate is discovered creatively, so that the indoor ventilation times can be set according to the law of quantitative change, and consumption is reduced effectively.

The invention discloses a method for detecting the ventilation frequency of an independent ventilation cage box, and the method comprises the steps: firstly, measuring the volume V0 of the independentventilation cage box, enabling the small-diameter end of an enclosure structure of a hollow circular-truncated-cone-shaped structure to be communicated with an air inlet in the inner side of the independent ventilation cage box, and enabling the diameter of the small-diameter end to be the same as that of the air inlet; adhering a rubber pad to the inner side of the small-diameter end, wherein the diameter of the large-diameter end is twice larger than that of the small-diameter end, and the height of the enclosure structure is 3.33 times larger than that of the small-diameter end; and then measuring the average wind speed v at the large-diameter end of the enclosure structure, the area S of the large-diameter end of the enclosure structure and the air inlet temperature t, and finally obtaining the ventilation frequency of the independent ventilation cage box according to a calculation formula. The problems that the wind speed is not concentrated and measurement is inaccurate due to the fact that the diameter of the air opening of each independent ventilation cage box is too small or the air opening is provided with an air diffuser can be solved, and the ventilation frequency of each independent ventilation cage box can be reflected more accurately and truly.

The invention discloses a method for detecting the ventilation frequency of an independent ventilated cage box. The steps are as follows: firstly, the volume of the independent ventilated cage box is measured as 0 , connect the small-diameter end of the enclosure structure of the hollow conical structure with the air inlet inside the independent ventilation cage box, wherein the diameter of the small-diameter end is the same as the diameter of the air inlet, and the inside of the small-diameter end is glued with a rubber pad, and the diameter of the large-diameter end is larger than the small diameter 2 times of the end diameter, the height of the enclosure structure is 3.33 times of the diameter of the small diameter end; then measure the average wind speed v at the large diameter end of the enclosure structure, the area S and the inlet air temperature t of the large diameter end, and finally According to the calculation formula, the number of air changes of the independent ventilation cage box is obtained. The beneficial effect of the present invention is: the enclosure structure is added, which can avoid the wind speed being not concentrated due to the too small diameter of the tuyere of the independent ventilation cage box or the diffuser at the tuyere. , The problem of inaccurate measurement can more accurately and truly reflect the number of air changes of each independent ventilation cage box.

The invention relates to an air conditioner air supply system for improving uniformity of temperature and humidity of an elevated warehouse of a cigarette factory. The air conditioner air supply system for improving the uniformity of the temperature and the humidity of the elevated warehouse of the cigarette factory comprises an air compression device, an air supply system, and an air return system. The air supply system comprises an upper-layer air supply pipeline, twist outlets, spraying outlets, a lower-layer air supply pipeline and double deflection grilles. The upper-layer air supply pipeline is connected with an air outlet of the air compression device. The twist outlets and the spraying outlets are arranged and distributed in the upper-layer air supply pipeline. The lower-layer air supply pipeline is connected with the air compression device. The double deflection grilles are arranged in the lower-layer air supply pipeline. The air return system comprises an air return pipeline and single deflection grilles, wherein the single deflection grilles are distributed and arranged in the air return pipeline. The air return pipeline is connected with an air return mouth of the air compression device. According to the air conditioner air supply system for improving the uniformity of the temperature and the humidity of the elevated warehouse of the cigarette factory, the temperature and the humidity of the warehouse can meet design requirements, the temperature and the humidity of an upper layer of the storehouse and the temperature and the humidity of a lower layer of the warehouse are enabled to be uniform, and therefore air circulation ratio of the warehouse is reduced, and energy consumption for air supply of air conditioners is reduced.

The invention relates to an air conditioner automatic-control method for improving the cigarette factory high rack storage temperature and humidity uniformity. The air conditioner automatic-control method is formed by a summer mode and a winter mode, and includes the steps of (1) arranging sensors to automatically detect the supply air temperature T<supply> and the high rack storage practical temperature T<aver>, wherein when the supply air temperature T<supply> is higher than the high rack storage practical temperature T<aver>, the air conditioner automatic-control method is in the winter mode, otherwise, the air conditioner automatic-control method is in the summer mode, and the relation between the air conditioning system load rate y<1> and the supply air volume x is y<1> = -0.1*x+1.1; and (2) arranging sensors to respectively detect the supply air volume of an upper-layer air pipe and the supply air volume of a lower-layer air pipe, and controlling the supply air volume of the upper-layer air pipe and the supply air volume of the lower-layer air pipe according to the relations between the upper-and-lower layer supply air proportions and the load rates in different seasons. According to the scheme of the air conditioner automatic-control method for improving the cigarette factory high rack storage temperature and humidity uniformity, the aims that the storage temperature and the storage humidity meet the design requirements, and the temperature and the humidity of the upper layer and the lower layer of a storage area are uniform are achieved; on the basis, the storage ventilation rate is reduced, and air supplying energy consumption of an air conditioner is reduced.

The invention discloses a household constant temperature and humidity square bin system which comprises a constant temperature and humidity air forming square bin, a water pool, a water supply and drainage system, an air supply pipeline, an air return pipeline and a central control cabinet, wherein the constant temperature and humidity air forming square bin comprises an air return and suction unit, a draught fan, a water circulation and spraying unit and an air supply unit; the air return and suction unit is provided with a window and can directly communicate with the outside world through the window; the air return and suction unit is further provided with a connector and can be connected with the air return pipeline through the connector; and the draught fan is arranged between the airreturn and suction unit as well as the water circulation and spraying unit. The household constant temperature and humidity square bin system disclosed by the invention has the advantages that the pollution is avoided, the electric energy consumption is low, the water consumption is low, the noise is low, the air change rate is low, the room temperature and humidity are moderate, and the human body feels comfortable. Meanwhile, due to a square bin structure, the household constant temperature and humidity square bin system further has the advantages of being simple and convenient to transport,mount and dismount, small in occupied area, low in investment, and high in operability.

The invention discloses a vibration-isolated construction method for a ventilation air-conditioning machine room. The method comprises steps as follows: a damper spring shock absorber and a steel reinforced concrete hybrid structured base are added below a refrigerating unit, a water inlet pipeline and a water outlet pipeline obtain horizontal vibration-proof support through a steel frame support structure, a fresh air pipeline is hoisted and mounted in a vibration isolation manner, acoustical board construction is performed on both the wall surface and the top surface, and a soundproof and fireproof door is mounted. The vibration-isolated construction method has the benefits as follows: vibration isolation supports are arranged independently for different pipelines, and collision with other pipelines can be avoided; the noise can be reduced by 24 dB effectively, the noise in the machine room is only about 32 dB, and the vibration and noise reduction effects are obvious; mounting and dismounting are convenient, construction is easy, the cost is lower, indoor air ventilation is solved effectively, ordered and effective ventilation is realized, indoor polluted air is treated rapidly and economically, and the method is particularly suitable for places with higher air quality requirements, more people activities and higher ventilation rate and requiring air change and circulation.

A direct-evaporation temperature and humidity exchange air-conditioning system comprises an air-conditioning chamber and an air feed and return system, wherein the air-conditioning chamber consists of an air feed chamber, a spray chamber and an air return chamber, and the air feed and return system comprises air feed pipes, an air feed inlet, air return pipes and an air return inlet. An air blower is mounted between the air feed chamber and the spray chamber, a water baffle, spray pipes and spray nozzles are mounted in the spray chamber, and the air feed chamber feeds cold and humid air into a working area through the air feed pipes and the air feed inlet on the upper portion of the working area. The spray pipes are modified to be arranged in 2-6 rows, ground air return pipes are arranged under the ground of the working area, upper air return pipes are arranged above the working area, an air return fan in the air return chamber and the air return inlet and a disc type filter screen on the wall of a workshop are omitted, so that the integral system runs circularly and naturally by air density difference, and temperature and humidity can be dynamically balanced. The direct-evaporation temperature and humidity exchange air-conditioning system has the advantages of few air exchange times, low water consumption and power consumption and proper temperature and humidity in the workshop, static electricity during technical process of products can be avoided, and off-machine moisture regain of cashmere can reach 18% and the like.