1675 results about "Water chiller" patented technology

A high efficiency, low maintenance single stage or multi-stage centrifugal compressor assembly for large cooling installations. The assembly is highly efficient by virtue of a variable frequency drive (VFD) that drives a permanent magnet motor and matches compressor speed with compressor load, a direct drive impeller that eliminates gearing losses, and magnetic bearings that reduce frictional losses. The back-emf produced by the motor provides an intermediate power source for the magnetic bearings in the event of a loss of electrical power. A cooling system provides direct cooling of the rotor with gas refrigerant, and cooling of the stator with liquid refrigerant. Modular construction allows the compressor to be retrofit with upgrades. An inlet guide vane system operates without need for oil lubrication. The use of light metal castings and elimination of gearing reduces the weight to one-third or less of comparably powered conventional units.

A method (126) and a low capacity controller (28) enable a chiller system (20) to operate below a minimum allowable capacity. The chiller system (20) includes a chiller (40) and a chiller fluid loop (30), having a supply line (36) for conveying a chiller fluid (34) from the chiller (40) and a return line (38) for returning the chiller fluid (34) to the chiller (40). A capacity demand for the chiller (40) is determined. When the capacity demand is less than a minimum allowable capacity of the chiller (40), the chiller fluid (34) is routed from the return line (38) to a heat exchanger (96) of the low capacity controller (28) where the chiller fluid (34) is warmed and returned to the return line (38). The warmed chiller fluid (34) establishes a false capacity demand, detectable at the chiller (40), that is at least the minimum allowable capacity.

The applicant describes a system and methods of calculating the overall operating efficiency of an air conditioning chiller that evaluates efficiency of the component parts of the chiller and generates an overall efficiency based on these component efficiency values. If the overall chiller efficiency is less than the maximum attainable chiller efficiency, the cost of the inefficiency is calculated and presented to the user. The accuracy of the overall efficiency calculation is improved, insight is obtained regarding the causes of the inefficiency, and recommendations for corrective action to restore maximum chiller efficiency are identified and presented to the user. The system also adjusts the efficiency calculations as appropriate to account for actual compressor current load conditions.

An energy-saving optimized control system for a chiller plant room comprises an industry control computer (1), a flow sensor (4), a temperature sensor (5), an outdoor temperature and humidity sensor (6), a three-phase active power transmitter (7), a water pump variable speed driver (9) and a cooling tower fan variable speed driver (10), which are respectively connected with a programmable controller (2), wherein the programmable controller (2) communicates with the industrial control computer (1) through an industrial Ethernet; and an RS485 communication interface module (3) is connected with chillers and communicates with the industrial control computer (1) through a ModBus protocol. An energy-saving optimized control method for a chiller plant room is also provided. By establishing a mathematical model of the relationship between the energy consumption and operation parameters of each equipment in the refrigeration plant room and combining the real-time cooling loads and weather parameters, the operating state of each equipment is adjusted so as to reach the lowest operating energy consumption of the whole chiller plant room under the premise of meeting the cooling loads.

A high efficiency, low maintenance single stage or multi-stage centrifugal compressor assembly for large cooling installations. A cooling system provides direct, two-phase cooling of the rotor by combining gas refrigerant from the evaporator section with liquid refrigerant from the condenser section to affect a liquid/vapor refrigerant mixture. Cooling of the stator with liquid refrigerant may be provided by a similar technique. A noise suppression system is provided by injecting liquid refrigerant spray at points between the impeller and the condenser section. The liquid refrigerant may be sourced from high pressure liquid refrigerant from the condenser section.

This invention discloses a compressed central air-conditioning adaptive variable flow energy saving control device composed of an adaptive variable flow controller, ice water control subsystem, frozen water control subsystem, cooling water control subsystem, cooling tower blower fan control subsystem, the adaptive variable flow controller connects with control subsystem of ice water device, frozen water pump, cooling water and blower fan of cooling tower capable of making every operational target to reach the most optimized.

The invention discloses an electronic expansion valve control system which comprises sensors and a controller. A suction pressure sensor which is used for detecting suction pressure Ps and a suction temperature sensor which is used for detecting suction temperature Ts are arranged in a pipeline from an evaporator to a compressor, and an exhaust pressure sensor which is used for detecting exhaust pressure Pd and an exhaust temperature sensor which is used for detecting exhaust temperature Td are arranged in another pipeline from the compressor to a condenser; the controller takes a Ps signal, a Ts signal, a Pd signal and a Td signal collected through the sensors as criterion of control logic of the compressor and an electronic expansion valve. Accordingly, the advantages of controlling the degree of overheat of the suction and controlling the degree of overheat of the exhaust are combined, and at the same time the electronic expansion valve conducts control according to the suction pressure in a certain time after the compressor is stared up. The electronic expansion valve control system and method are used for controlling a water chilling unit, the stability of the electronic expansion valve control of the water chilling unit is guaranteed, the reliability of the water chilling unit is improved, and requirements of users for water chilling unit products are met.

The invention provides a group control method for a central air conditioning refrigerating unit. The group control method for the central air conditioning refrigerating unit comprises step A, entering into a step B when the water outlet temperature of a refrigerating unit basically achieves a stable temperature; step B, measuring the temperature and flow amount for water supply and water return of chilled water to obtain temperature difference and the flow amount of the water supply and the water return; step C, computing the load according to the temperature difference and the flow amount of the water supply and the water return; step D, controlling loading and unloading of refrigerating machines of the refrigerating unit. According to the group control method for the central air conditioning refrigerating unit, the group control algorithm for the refrigerating unit is achieved through thermal, the refrigerating unit is operated under an economical and energy saving state and the purposes of prolonging the service life of the device and reducing the energy consumption are achieved. The group control method for the central air conditioning refrigerating unit has a good popularization prospect in the fields of building automatic control and building energy saving.

The invention discloses an air treatment device and an air treatment method. The air treatment device is characterized by comprising an air treatment part and a control and regulation part, wherein the air treatment part comprises a return air inlet (1) for receiving indoor return air, a return air regulating air valve (2), a fresh air port (3) for receiving indoor fresh air, a fresh air regulating air valve (4), a high-temperature meter cooler (5) communicated with high-temperature chilled water, a low-temperature meter cooler (7) communicated with low-temperature chilled water, a bypass regulating air valve (9), a heater (10), a humidifier (11), a fan (12) for supplying air to an indoor space, and an air outlet (13) for supplying air to the indoor space, wherein the high-temperature meter cooler (5) and the low-temperature meter cooler (7) which are connected in turn are arranged in a flow direction of the air entering the air treatment device and flowing out of the air treatment device. The evaporating temperature of a water chiller is improved, and the energy efficiency of an air-conditioning system is improved.

The invention relates to a system for monitoring energy efficiency ratio of operation of a water cooler set and a monitoring method thereof. The system comprises a controller for monitoring the energy efficiency ratio of operation of the water cooler set, a local monitoring computer, a remote monitoring computer and a frozen water supply temperature sensor of a cold supply pipe network, a frozen water return temperature sensor of the cold supply pipe network, a frozen water flowmeter of the cold supply network and a power sensor of a refrigeration compressor which are correspondingly connected with the water cooler set; the frozen water supply temperature sensor of the cold supply pipe network, the frozen water return temperature sensor of the cold supply pipe network, the frozen water flowmeter of the cold supply network and the power sensor of the refrigeration compressor are connected with the controller for monitoring the energy efficiency ratio of operation of the water cooler set respectively; and the local monitoring computer and the remote monitoring computer are connected with a signal of the controller for monitoring the energy efficiency ratio of operation of the water cooler set through a convertor I and a convertor II respectively. The system is suitable for the water cooler set of a central air conditioning system using electric power as primary drive energy; and the measured energy efficiency ratio of operation of the water cooler set is suitable for supervising daily energy-saving operation of the water cooler set.

A method and machine to produce drinking water from fresh air using an energy saving and environmentally friendly chiller is comprising the following steps of: Filtering and sterilize fresh air, then passed to several evaporator coils to condensate the moisture and the condensate collected to a pan.

Passing secondary condenser by cold air after passing evaporator coil and dipping tertiary condenser to a cold condensate water tank, so the refrigerant after the condenser will be subcooled and after passing through the expansion valve, will heat exchange with the brine as a secondary refrigerant in the heat exchanger.

Where brine is passed to several evaporator coils in air handling unit to cool and condensate the moisture passing through the air handling unit, a part of the air will condensate and the other part will passed to a cooled room where the cold air of the room then will exhaust and used to cool the main condenser through the exhaust air duct.

The invention relates to an air-conditioning unit device by heat-moisture subsection treatment and an air treating method thereof. The air treating method is divided into two parts, wherein, the air treating method of heat-moisture subsection treatment comprises that: indoor return air and fresh air are mixed, exchange heat with high-temperature cooling water through a first surface air cooler (3) first, reduces to the dew-point temperature through constant wetness, removes most of sensible heat load and enters to a second surface air cooler (4); in the second surface air cooler (4), air and low-temperature cooling water further exchange heat, are cooled, generate condensed water and remove the sensible heat load; the air after temperature reduction and dehumidification is treated to an air feeding state point by a heater (5) and a humidifier (6), finally pressurized by a blower (7) and sent to an air-conditioning room; the air-conditioning unit device adopts the following method that: refrigerant in a first water chiller unit is compressed and discharged by a first compressor (11) and enters a condenser (12) for condensation, then passes through a first liquid storage tank (13) and a first filter (14), is throttled and depressurized by a first electronic expansion valve (15) and enters a first evaporator (10) for heat exchange with cooling water.

The invention discloses a low-temperature air-cooled water chiller unit and a control method thereof. The low-temperature air-cooled water chiller unit comprises an electric cabinet for control operations of the unit, a compressor for compressing refrigerant, a condenser exchanging heat with the ambient temperature, a fan for accelerating heat dissipation of the condenser, an expansion valve for reducing the pressure of the refrigerant and throttling the refrigerant, and an evaporator for preparing chilled water. A pressure maintaining valve for rapidly establishing pressure difference is arranged between the outlet end of the compressor and the inlet end of the condenser, and a secondary oil separator is arranged between the inlet end of the pressure maintaining valve and the outlet end of the compressor. By means of the technical scheme above, the low-temperature air-cooled water chiller unit overcomes the problems that, at low temperatures, the unit cannot start, the compressor cannot rapidly establish the pressure difference and is difficult to return oil and the like; meanwhile, the low-temperature air-cooled water chiller unit can continuously perform refrigeration at a low temperature of minus 40 DEG C to provide sufficient circulating cooling water for nuclear power equipment and further ensure normal and safe operation of the nuclear power equipment.

Disclosed are an air-cooled water chiller with a natural cooling function and a control method for the water chiller. The air-cooled water chiller with the natural cooling function comprises a compressor, a condenser, a throttler and an evaporator which are sequentially connected, a condensate fan is arranged on the condenser, the air-cooled water chiller further comprises a natural cooling coil, a three-way valve, an inlet chilled water temperature sensor, an outlet chilled water temperature sensor, an outdoor environment temperature sensor and a controller, the natural cooling coil is arranged on an air inlet side of the condenser, the three-way valve comprises a first joint, a second joint and a third joint and is serially connected onto a water inlet pipe of the evaporator through the first joint and the second joint, a water inlet pipe of the natural cooling coil is communicated with the water inlet pipe of the evaporator, and a water outlet pipe of the natural cooling coil is communicated with the third joint of the three-way valve. The air-cooled water chiller has the advantages of remarkable energy-saving effect, high running reliability, simple control method, compact structure, small occupied space and low production cost.

The invention provides a GRNN-based water chilling unit energy efficiency model modeling method and a water chilling unit group-control method based on cold load prediction and a water chilling unit energy efficiency model, and belongs to the field of water chilling unit energy saving. The water chilling unit energy efficiency model is established by using a GRNN technology and actual operating data of a refrigeration system, so that the energy consumption of the water chilling unit under different operating conditions can be predicted quickly and accurately. The operating unit number and theload rate distribution of the water chilling unit are optimized in real time by using the cooling load prediction data and the water chilling unit energy efficiency model with a goal of minimum systemenergy consumption, so that the operation energy efficiency of the refrigeration system is effectively improved.

A refrigeration unit for an aircraft galley comprises a frame establishing a main compartment, and a side window that receives a side access compartment, where a the dividing wall separates the side compartment interior space from a main chilled compartment. A side door mounted to the side access compartment allows access to the side compartment but not the main compartment, allowing segregation of snacks and items accessible to passengers via self-serve from those that are only distributed by flight attendants.