33results about How to "Enough heat exchange area" patented technology

The invention discloses a floating passive cooling device of a spent fuel pool in a nuclear power plant. The passive cooling device at least comprises a heat exchange tube assembly. The heat exchange tube assembly comprises a plurality of heat exchange tubes and a grillwork, wherein the heat exchange tubes are filled with a certain quantity of cooling working media, and certain negative pressure is kept inside each heat exchange tube; the heat exchange tubes are evenly arranged on the grillwork in an equidistant mode, and the grillwork can generate a certain amount of buoyancy in liquid of the spent fuel pool so that the heat exchange tube assembly can float on the liquid level of the spent fuel pool. The portion, placed under the liquid level of the spent fuel pool, of each heat exchange tube is a heat absorption end, and the portion, placed over the liquid level of the spent fuel pool, of each heat exchange tube is a heat release end. The cooling working media are low boiling point working media. The invention further discloses a floating passive cooling system of the spent fuel pool in the nuclear power plant. By implementing the floating passive cooling device and system of the spent fuel pool in the nuclear power plant, operating can be conducted in a completely passive mode, so that safety is improved; the heat radiating area is further increased, and the heat removal capacity is greatly improved; the heat transfer working media can be recycled, and the device and system are environmentally friendly and stable.

The invention discloses a tube bundle heat exchanger comprising a shell forming an annular cavity, wherein a plurality of heat exchange tube rows are arranged in the annular cavity, each of the heat exchange tube rows helically extends along the axial direction of the annular cavity, and the plurality of heat exchange tube rows are staggered in the circumferential direction of the annular cavity.The tube bundle heat exchanger provided by the solution has the advantages of compact structure, light weight and strong heat exchange capacity. It is particularly important that, under the premise ofobtaining the required heat exchange efficiency in the tube bundle heat exchanger, the external heat exchange medium does not need to change the flow direction, that is, enters in the axial direction, and continues to flow in the axial direction inside the annular cavity and finally flows out, thereby avoiding the back and forth turning of the airflow to reduce the flow energy loss of the external heat exchange medium. The tube bundle heat exchanger can also withstand high temperatures and pressures, and can work reliably under conditions that require super heat exchange capacity and in harshworking conditions.

The invention discloses an exposure lighting set and an exposure machine. The exposure lighting set comprises a tube-shaped light source, an inner water jacket, an outer water jacket and a tube-shaped light filter. The inner water jacket sleeves the tube-shaped light source. The outer water jacket sleeves the inner water jacket, thereby a space is formed between the inner and the outer water jackets. The tube-shaped light filter is disposed between the inner and the outer water jackets. The circumferential wall surface area of the tube-shaped light filter is larger than the product of the external diameter circumference and the external diameter length of the tube-shaped light filter. The invention has advantages of providing sufficient heat exchange area; facilitating the cooling system to quickly take away the heat of the tube-shaped light filter.

The invention discloses a multi-fan cooling tower control method, a cooling tower and an air conditioner. The multi-fan cooling tower control method comprises the following steps that the actual wateroutlet temperature tc of the cooling tower is detected, the current environment wet bulb temperature tw is acquired, the middle temperature interval is calculated according to the current environmentwet bulb temperature tw, and the actual water outlet temperature is compared with the middle temperature interval; when the actual water outlet temperature is higher than the middle temperature interval, whether all fans are in an open state or not is judged, if yes, the air speed of the fans are increased, or otherwise the running number of the fans is increased; and / or when the actual water outlet temperature is lower than the middle temperature interval, whether all the fans are at the lowest air speed or not is judged, if yes, the running number of the fans is reduced, or otherwise, the air speed of the fans is reduced. According to the multi-fan cooling tower control method, the cooling tower and the air conditioner, the advantages of being accurate in adjusting effect, simple to control, prominent in energy-saving performance, low in production cost and the like are achieved.

The invention relates to a compound electromagnetic induction heater of an oil storage tank, in particular to a heater for overcoming the defects of a traditional electrical heated tube. The compound electromagnetic induction heater is especially suitable for rapidly heating crude oil in the oil storage tank of an oil field, is beneficial to oil and water separation, and consists of a power supply, an overtemperature protection temperature controller, an oil temperature display temperature controller, a high-frequency controller, an anti-explosion metal hoses, an oil storage tank, a hoisting hook, a sealing device, an oil temperature sensor, an overtemperature protection sensor, a nichrome heating ring, a high-frequency electromagnetic induction heating ring, a heater box, a heater box machine angle, a high-frequency heating core tube, a nichrome heating core tube and a controller box, wherein wires in the heater box are connected with the temperature controller and the high-frequency controller in the control box through the anti-explosion metal hoses. The compound electromagnetic induction heater has the beneficial effects that enough heat exchange area is ensured, and the heat efficiency is improved; when the core tubes are heated, the crude oil ascends rapidly to perform convective circulation movement, which is beneficial to the oil and water separation, so that the temperature at each part of the oil storage tank is more uniform; and an independent overtemperature protection function is realized, so that safe accidents do not occur.

The invention provides a fresh air unit control system, which includes an internal heat exchanger and an external heat exchanger connected by pipelines, the internal heat exchanger includes a plurality of sub-heat exchangers arranged in parallel, and a plurality of sub-heat exchangers The refrigeration output branch pipelines are connected to the refrigeration output main pipeline, and at least one refrigeration output branch pipeline is provided with a solenoid valve and a one-way valve arranged along the refrigeration direction in parallel. The heat exchanger of the internal unit is composed of multiple sub-heat exchangers connected in parallel. The check valve enables the heat exchanger of the fresh air unit to participate in the refrigeration cycle when the fresh air unit is cooling at low temperature, ensuring sufficient heat exchange area and preventing the compressor from returning liquid and overheating. Hand in frosting. Adjust the opening and closing of the heat exchanger of the internal unit through the solenoid valve, and control the heat exchange opening area of ​​the heat exchanger of the internal unit, so that when the system is heating at low temperature, the heat exchanger of the internal unit can be used as a condenser to close part of the heat exchange circuit, reducing the Condensation effect, increase the condensation pressure, so that the compression ratio of the compressor can be established normally, thus ensuring the safety of the fresh air fan system.