2641 results about "Enthalpy" patented technology

A fuel cell gas management system including a cathode humidification system for transferring latent and sensible heat from an exhaust stream to the cathode inlet stream of the fuel cell; an anode humidity retention system for maintaining the total enthalpy of the anode stream exiting the fuel cell equal to the total enthalpy of the anode inlet stream; and a cooling water management system having segregated deionized water and cooling water loops interconnected by means of a brazed plate heat exchanger.

A method of calculating net sensible cooling capacity of a cooling unit includes measuring a discharge pressure from of fluid from a compressor and a suction pressure from an evaporator, calculating a condensing temperature of fluid flowing from the compressor and an evaporating temperature of fluid flowing from the evaporator, calculating a mass flow rate of fluid flowing from the compressor, calculating enthalpy of fluid flowing from the compressor, of fluid flowing from the thermal expansion valve, and of fluid flowing from the evaporator, calculating a mass flow rate of fluid flowing through the hot gas bypass valve, and calculating net sensible cooling capacity. Embodiments of cooling units and other methods are further disclosed.

An index of air re-circulation in a data center having one or more racks is determined to identify the level of heated air re-circulation into cooling fluid delivered to the one or more racks. The one or more racks comprise inlets and outlets and are positioned along a cool aisle and a hot aisle. The index is calculated by dividing the enthalpy rise due to infiltration of heated air into the cool aisle and the total enthalpy rise of the heated air from the outlets of the one or more racks.

The invention discloses a computing method of the refrigerating capacity and the refrigerating efficiency of an oil-free refrigerating system and the refrigerating system. The computing method comprises the following steps of (1) collecting parameters; (2) looking up and obtaining an enthalpy value; (3) computing the enthalpy value; (4) computing the refrigerating capacity and the refrigerating efficiency of the refrigerating system. The refrigerating system comprises a refrigerating unit, a computing module and a display module, wherein the display module is electrically connected with the computing module and is used for displaying the computed refrigerating capacity Q and the computed refrigerating efficiency EER. According to the computing method of the refrigerating capacity and the refrigerating efficiency of the oil-free refrigerating system and the refrigerating system disclosed by the invention, a flow meter of which the cost is expensive is not required to be additionally arranged, the computing method is simple and effective, and the cost is lower; the display module can be used for displaying the refrigerating capacity and the refrigerating efficiency to a user for reference through a display panel, so that an operating state of the refrigerating system can be conveniently controlled by the user in real time.

Provided are an anode active material for a lithium secondary battery having high reversible capacity and excellent charge/discharge efficiency, comprising a complex composed of ultra-fine Si phase particles and an oxide surrounding the ultra-fine Si phase particles, and a carbon material; and a method for preparing the same. The present invention also provides a method for preparing an anode active material for a lithium secondary battery comprising producing a complex composed of ultra-fine Si particles and an oxide surrounding the ultra-fine Si particles by mixing a silicon oxide and a material having an absolute value of oxide formation enthalpy (ΔH_for) greater than that of the silicon oxide and negative oxide formation enthalpy by a mechanochemical process or subjecting them to a thermochemical reaction to reduce the silicon oxide; and mixing the Si phase-containing oxide complex and carbon material.

An apparatus 10 is provided that measures the speed of sound propagating in a multiphase mixture to determine parameters, such as mixture quality, particle size, vapor/mass ratio, liquid/vapor ratio, mass flow rate, enthalpy and volumetric flow rate of the flow in a pipe or unconfined space, for example, using acoustic and/or dynamic pressures. The apparatus includes a pair of ultrasonic transducers disposed axially along the pipe for measuring the transit time of an ultrasonic signal to propagate from one ultrasonic transducer to the other ultrasonic transducer. A signal process, responsive to said transit time signal, provides a signal representative of the speed of sound of the mixture. An SOS processing unit then provides an output signal indicative of at least one parameter of the mixture flowing through the pipe. The frequency of the ultrasonic signal is sufficiently low to minimize scatter from particle/liquid within the mixture. The frequency based sound speed is determined utilizing a dispersion model to determine the at least one parameter of the fluid flow and/or mixture.

A method of operation of a plasma torch and the plasma apparatus to produce a hot gas jet stream directed towards a workpiece to be coated by first injecting a cold high pressure carrier gas containing a powder material into a cold main high pressure gas flow and then directing this combined high pressure gas flow coaxially around a plasma exiting from an operating plasma generator and converging directly into the hot plasma effluent, thereby mixing with the hot plasma effluent to form a gas stream with a net temperature based on the enthalpy of the plasma stream and the temperature and volume of the cold high pressure converging gas, establishing a net temperature of the gas stream at a temperature such that the powdered material will not melt or soften, and projecting the powder particles at high velocity onto a workpiece surface. The improvement resides in mixing a cold high pressure carrier gas with powder material entrained in it, with a cold high pressure gas flow of gas prior to mixing this combined gas flow with the plasma effluent which is utilized to heat the combined gas flow to an elevated temperature limited to not exceeding the softening point or melting point of the powder material. The resulting hot high pressure gas flow is directed through a supersonic nozzle to accelerate this heated gas flow to supersonic velocities, thereby providing sufficient velocity to the particles striking the workpiece to achieve a kinetic energy transformation into elastic deformation of the particles as they impact the onto the workpiece surface and forming a dense, tightly adhering cohesive coating. Preferably the powder material is of metals, alloys, polymers and mixtures thereof or with semiconductors or ceramics and the powder material is preferably of a particle size range exceeding 50 microns. The system also includes a rotating member for coating concave surfaces and internal bores or other such devices which can be better coated using rotation.

A preferred process arrangement utilizes the enthalpy of the flue gas, which can be supplemented if need be, to convert urea (30) into ammonia for SCR. Urea (30), which decomposes at temperatures above 140 ° C., is injected (32) into a flue gas stream split off (28) after a heat exchanger (22), such as a primary superheater or an economizer. Ideally, the side stream would gasify the urea without need for further heating; but, when heat is required it is far less than would be needed to heat either the entire effluent (23) or the urea (30). This side stream, typically less than 3% of the flue gas, provides the required temperature and residence time for complete decomposition of urea (30). A cyclonic separator can be used to remove particulates and completely mix the reagent and flue gas. This stream can then be directed to an injection grid (37) ahead of SCR using a blower (36). The mixing with the flue gas is facilitated due to an order of magnitude higher mass of side stream compared to that injected through the AIG in a traditional ammonia-SCR process.

The present invention provides a molded article obtained from an aliphatic polyester resin composition comprising 60 to 99.9 parts by weight of at least one aliphatic polyester (A) and 0.1 to 40 parts by weight of at least one elastic polymer (B), provided that the total amount of the components (A) and (B) is 100 parts by weight, wherein the aliphatic polyester component in the molded article has an enthalpy of crystal fusion ΔH determined using a differential scanning calorimeter of 5 J/g or more, the molded article has a continuous phase composed of the aliphatic polyester (A) and dispersed phases composed of the elastic polymer (B), and the distance T between the walls of the dispersed phases is less than 5.0 μm.

Disclosed is a data center and methods for cooling thereof. The data center includes a plurality of data cells. Each data cell included a first heat exchanger, a first set of equipment racks, a second heat exchanger, a second set of equipment racks, and a plurality of fans operable to establish a substantially horizontal and vertical air flow through the heat exchangers and the equipment racks. The data center includes a plurality of mixed air chambers. One air chamber is located between two data cells to form a substantially continuous, closed-loop air flow through the cells and chambers. The air chambers include an outside air intake for drawing ambient air into the closed loop air flow based on a comparison of enthalpy of the closed loop air and the ambient air.

A probe 10,170 is provided that measures the speed of sound and/or vortical disturbances propagating in a single phase fluid flow and/or multiphase mixture to determine parameters, such as mixture quality, particle size, vapor/mass ratio, liquid/vapor ratio, mass flow rate, enthalpy and volumetric flow rate of the flow in a pipe or unconfined space, for example, using acoustic and/or dynamic pressures. The probe includes a spatial array of unsteady pressure sensors 15-18 placed at predetermined axial locations x₁-x_N disposed axially along a tube 14. For measuring at least one parameter of a saturated vapor/liquid mixture 12, such as steam, flowing in the tube 14. The pressure sensors 15-18 provide acoustic pressure signals P₁(t)-P_N(t) to a signal processing unit 30 which determines the speed of sound a_mix propagating through of the saturated vapor/liquid mixture 12 in the tube 14 using acoustic spatial array signal processing techniques. Frequency based sound speed is determined utilizing a dispersion model to determine the parameters of interest.

The invention relates to a kind of nano cellulose solid - solid phrase change material and its producing method. Its characteristics are: in non-homogeneous phase system, according to the reactants proportions as polyethylene glycol containing active group at one end or both ends 19.8% - 82.0%, crosslinking agent 0% - 55.1% and nanometer cellulose or its ramification 4.0% - 69.5%, ingraft the polyethylene glycol containing active group at one end or both ends as energy storing function group onto nanometer cellulose or its ramification framework material. The biggest enthalpy of phase change of the nanometer cellulose solid - solid phrase change material of the invention can get to over 110 J/g, the phrase change temperature is 0 - 60 Deg. C, and can keep good solid state before and after the phrase change. It won't occur phrase separation, besides it is non-toxic and harmless, low cost, simple producing technics.

Monocrystalline silicon solaode chemical etching, washing, drying method and integral processor belong to technique field of chemical etching technique and washing. It characterized in that it not only includes water, acid, alkali, but also ultrasonic participates in etching and washing course: it includes following steps: (1) ultrasonic washes and heats in advance, (2) ultrasonic removes damnification layer, (3) ultrasonic makes herbs into wool, (4) ultrasonic rinses, (5) washing with acid to counteract, (6) ultrasonic rinses, (7) cutting water, (8) hot enthalpy to dry. Positive effects of the invention are: adopting ultrasonic to etch and wash, liquid of making wool can be acted with silicon piece, similar coarseness degree can be generated on surface, perfect pyramid pattern can be obtained; it also eliminates kalium, natrium ion from alkalescent solution, and extends service life of silicon piece; pollution can be decreased, energy consumption and water source can be saved greatly, it is a practical invention.

The invention provides a refrigerant mass and flow measuring method and device and a measuring instrument. The method is used in a refrigerating system and comprises the steps that the evaporation pressure and the condensation pressure are obtained; the air suction temperature and the exhaust temperature of a compressor are obtained, and the compressor shell surface temperature, the environment temperature around the compressor and the compressor consumption power are obtained; the jetting temperature of an intermediate pressure container is obtained, and the oil content of a refrigerant mixture is obtained; a corresponding first enthalpy value, a corresponding second enthalpy value, a corresponding third enthalpy value, a corresponding fourth enthalpy value, a corresponding fifth enthalpy value, an enthalpy value difference and the heat exchange amount of the compressor and the outside environment are obtained through calculation according to the obtained various parameters; and according to the first enthalpy value, the second enthalpy value, the third enthalpy value, the fourth enthalpy value, the fifth enthalpy value, the enthalpy value difference, the heat exchange amount, the consumption power of the compressor and the oil content of the refrigerant mixture, the mass and flow of the refrigerant in the refrigerating system are obtained through calculation. According to the scheme, non-intrusive and high-precision measurement on the mass and flow of the refrigerant is achieved, bad influences brought to the refrigerating system in the measurement process are avoided, and the user experience is improved.

A waste heat recovery system, method and device executes a thermodynamic cycle using a working fluid in a working fluid circuit which has a high pressure side and a low pressure side. Components of the system in the working fluid circuit include a waste heat exchanger in thermal communication with a waste heat source also connected to the working fluid circuit, whereby thermal energy is transferred from the waste heat source to the working fluid in the working fluid circuit, an expander located between the high pressure side and the low pressure side of the working fluid circuit, the expander operative to convert a pressure/enthalpy drop in the working fluid to mechanical energy, a recuperator in the working fluid circuit operative to transfer thermal energy between the high pressure side and the low pressure side of the working fluid circuit, a cooler in thermal communication with the low pressure side of the working fluid circuit operative to control temperature of the working fluid in the low side of the working fluid circuit, a pump in the working fluid circuit and connected to the low pressure side and to the high pressure side of the working fluid circuit and operative to move the working fluid through the working fluid circuit, and a mass management system connected to the working fluid circuit, the mass management system, method and device having a working fluid vessel connected to the low pressure side of the working fluid circuit and configured to passively control an amount of working fluid mass in the working fluid circuit.

The invention concerns a method for detecting changes in a first flow of a heating or cooling medium in a refrigeration system whereby the first flow is conveyed through a heat exchanger wherein occurs heat transfer from the first flow to a second flow of a heating or cooling medium. The earliest possible detection of the changes is desired. For this it is provided that for the supervision of the first media flow moving through the heat exchanger a change in the enthalpy of the second media stream or a value derived therefrom is determined.

The invention provides a stretch blow molded container formed from a thermoplastic resin material which comprises polyglycolic acid having (a) a repeating unit represented by the following formula (1): (b) a melt viscosity, eta * [as measured at a temperature of (the melting point, Tm of the polymer+20 DEG C.) and a shear rate of 100/sec] of 500-100,000 Pa.s; (c) a melting point, Tm of at least 180 DEG C.; (d) a melt enthalpy, DELTA Hm of at least 20 J/g; and (e) a density of at least 1.50 g/cm3 as measured in an unoriented, crystallized form, wherein the stretch blow molded container has tensile strength (in a circumferential direction) of at least 100 MPa and a carbon dioxide permeability (as measured at a temperature of 23 DEG C. and 80% relative humidity; in terms of the thickness of 50 mu m) of 300 cc/m2.day.atm or smaller at the body sidewall thereof, and a production process thereof.

In an ejector cycle system using carbon dioxide as refrigerant, an ejector decompresses and expands refrigerant from a radiator to suck gas refrigerant evaporated in an evaporator, and converts an expansion energy to a pressure energy to increase a refrigerant pressure to be sucked into a compressor. Because refrigerant is decompressed and expanded in a super-critical area, a pressure difference during the decompression operation becomes larger, and a specific enthalpy difference becomes larger. Accordingly, energy converting efficiency in the ejector becomes higher, and efficiency of the ejector cycle system is improved.

The present invention is directed to improved seed coatings which facilitate fall or early spring planting while maintaining seed dormancy until soil temperatures are appropriate for successful germination. The improved seed coatings contain encapsulated phase change materials within a polymeric shell which preserve the dormancy of the seed during early planting by slowing the rate at which the seed temperature rises in the event of a temperature spike thus preventing premature germination. The encapsulated phase change material is a material characterized by a solid/liquid or liquid/solid phase change which occurs at a temperature which ranges from about −5 to about 20° C., preferably between about 0 to about 19° C., most preferably between about 5 to about 15° C. The solid/liquid or liquid/solid phase change is further characterized by an effective enthalpy of fusion/crystallization for the solid-liquid/liquid-solid phase change equal to or greater than 20 J/g when determined by Differential Scanning Calorimetry.