Double-temperature double-compressor water cooling unit and refrigerating control method thereof

A technology of dual compressors and water chillers, applied in the direction of compressors, compressors with cascading work, refrigerators, etc., can solve the problems of limited heat exchange effect of evaporators, complex structure, and inability to adjust, so as to achieve energy saving effect Significant, simple device structure, and the effect of reducing reheat loss

Pending Publication Date: 2017-05-31
ZHEJIANG LUTE ENERGY TECH
9 Cites 2 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0005] Although the above scheme meets the different requirements of multiple indoor units or heat exchange terminals in the same air conditioning system for evaporation temperature or condensation temperature, realizes the purpose of saving the initial investment of the air conditioning system and improving energy efficiency, but the structure of the scheme is relatively compli...
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Method used

A, dual-temperature refrigeration: the switching structure is controlled by the control module 18 so that the high-temperature shell-and-tube heat exchange device 11 is communicated with the low-temperature shell-and-tube heat exchange device 12 and the medium-temperature water inlet and outlet 13 simultaneously, and the chilled water sent back by the load side is passed through The high-temperature return water port 111 enters the high-temperature shell-and-tube heat exchange device 11, and exchanges heat with the refrigerant in the high-temperature compression refrigeration circuit 14 to realize cooling and cooling. Part of the cooled chilled water enters the low-temperature shell-and-tube heat exchange device 12, And continue to exchange heat with the refrigerant in the low-temperature compression refrigeration circuit 15, further cool down, and finally transport it from the low-temperature water outlet 121 to the terminal equipment, and the other part of the frozen water is diverted through the switching structure and then directly transported to the terminal equipment through the medium-temperature water inlet and outlet 13 ; In this embodiment, in this step, the control module 18 can adjust the ratio of water entering the low-temperature shell-and-tube heat exchange device 12 and the medium-temperature water inlet and outlet 13 by adjusting the three-way valve according to the load requirements to meet the requirements in the dual-temperature cooling process. A variety of load requirements for different needs.
As shown in Figure 1, the dual-temperature dual-compressor chiller of the present invention comprises a unit housing 1 with an inner cavity, and the unit housing 1 is composed of a refrigeration housing 2 of a high-temperature shell-and-tube heat exchange device 11 and a low-temperature The refrigerating shells 2 of the shell-and-tube heat exchange device 12 are butted with each other, and the unit shell 1 is provided with an insulation layer 17 on the outer side. The water outlet 121 and the high-temperature return port 111 are connected with the high-temperature shell-and-tube heat exchange device 11 in the casing 1 of the unit, and the low-temperature water outlet 121 is connected with the low-temperature shell-and-tube heat exchange device 12 in the unit. Between the heat exchange device 11 and the low-temperature shell-and-tube he...
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Abstract

The invention provides a double-temperature double-compressor water cooling unit and a refrigerating control method thereof and belongs to the technical field of air conditioner equipment. The double-temperature double-compressor water cooling unit comprises a unit shell provided with an inner cavity, the unit shell is provided with a high-temperature water return opening, a medium-temperature water feeding/discharging opening and a low-temperature water outlet, and the unit shell is internally provided with a high-temperature shell-tube pipe heat exchange device communicating with the high-temperature water return opening and a low-temperature shell-tube type heat exchange device communicating with the low-temperature water outlet; a switching structure is arranged between the high-temperature shell-tube pipe heat exchange device and the low-temperature shell-tube type heat exchange device, the high-temperature shell-tube pipe heat exchange device communicates with a high-temperature compression refrigeration loop located on the outer side of the unit shell in two directions, the low-temperature shell-tube type heat exchange device communicates with a low-temperature compression refrigeration loop located on the outer side of the unit shell in two directions, the low-temperature compression refrigeration loop and the high-temperature compression refrigeration loop are both connected with a control module, and the switching structure is connected with the control module. The double-temperature double-compressor water cooling unit has the advantages of being low in investment cost, high in heat exchange efficiency and the like.

Application Domain

Mechanical apparatusCompression machines with cascade operation +2

Technology Topic

EngineeringTubes types +5

Image

  • Double-temperature double-compressor water cooling unit and refrigerating control method thereof
  • Double-temperature double-compressor water cooling unit and refrigerating control method thereof
  • Double-temperature double-compressor water cooling unit and refrigerating control method thereof

Examples

  • Experimental program(2)

Example Embodiment

[0031] Example one
[0032] Such as figure 1 As shown, the dual-temperature dual-compressor chiller of the present invention includes a unit casing 1 with an inner cavity. The unit casing 1 consists of a refrigeration casing 2 of a high-temperature shell-and-tube heat exchange device 11 and a low-temperature shell-and-tube heat exchange device The refrigeration shells 2 of 12 are connected to each other, and the outer side of the unit shell 1 is provided with an insulation layer 17. The unit shell 1 is provided with a high-temperature water return port 111, a medium-temperature water inlet and outlet 13 and a low-temperature water outlet 121 respectively. The nozzle 111 communicates with the high temperature shell and tube heat exchange device 11 in the unit shell 1, and the low temperature water outlet 121 communicates with the low temperature shell and tube heat exchange device 12 in the unit. The high temperature shell and tube heat exchange device 11 communicates with the low temperature The shell and tube heat exchange device 12 is provided with a switching structure that enables the high temperature shell and tube heat exchange device 11 to communicate with the low temperature shell and tube heat exchange device 12 and/or the medium temperature water inlet and outlet 13 respectively. The device 11 is in two-way communication with the high-temperature compression refrigeration circuit 14 located outside the unit shell 1, the low-temperature shell and tube heat exchange device 12 is in two-way communication with the low-temperature compression refrigeration circuit 15 located outside the unit casing 1, and the low-temperature compression refrigeration circuit 15 and the high-temperature compression The refrigeration circuits 14 are all connected to the control module 18, and the switching structure is connected to the control module 18. In the above solution, the control module 18 controls the high-temperature compression refrigeration circuit 14 and the low-temperature compression refrigeration circuit 15 to operate in conjunction to achieve dual-temperature water supply, and according to The actual load demand flexibly adjusts the water supply temperature, which overcomes the shortcomings of conventional chillers that cannot adapt to load changes, and thus operate under low load and low EER conditions for a long time.
[0033] Specifically, the switching structure includes a three-way switching valve 16 provided between the high-temperature shell and tube heat exchange device 11 and the low-temperature shell and tube heat exchange device 12 and having three connection interfaces. The three-way switching valve 16 is connected to the control module 18 , And the high temperature shell and tube heat exchange device 11 and the low temperature shell and tube heat exchange device 12 are respectively connected to two of the connection ports of the three-way switching valve 16, and the remaining one of the three-way switching valve 16 is connected to the medium temperature water inlet and outlet 13 In this solution, the control module 18 adjusts the ratio of the medium temperature water output to the low temperature water output by adjusting the three-way switch valve 16 according to the indoor high and low load requirements to effectively and quickly meet the load changes in the functional area.
[0034] More specifically, the cold water inlet 21 of the high temperature shell and tube heat exchange device 11 is a high temperature return water inlet 111, and the cold water outlet 22 of the high temperature shell and tube heat exchange device 11 is connected to a connection interface of the three-way switching valve 16. The refrigerant inlet 234 and refrigerant outlet 233 of the heat transfer tube bundle 23 in the high temperature shell and tube heat exchange device 11 are respectively connected to the high temperature compression refrigeration circuit 14, and the cold water inlet 21 of the low temperature shell and tube heat exchange device 12 is connected to the tee A connection interface of the switching valve 16 is connected, the cold water outlet 22 of the low temperature shell and tube heat exchange device 12 is a low temperature water outlet 121, and the refrigerant inlet 234 of the heat transfer tube bundle 23 in the low temperature shell and tube heat exchange device 12 is connected to The refrigerant outlet 233 communicates with the low-temperature compression refrigeration circuit 15 respectively.
[0035] In order to improve the heat exchange effect, the refrigerant in the high temperature shell and tube heat exchange device 11 and the low temperature shell and tube heat exchange device 12 in this embodiment adopts R123a, R404A, R410A or other refrigerants with good cooling effect and good heat exchange effect. Any one or a combination of more.
[0036] Similarly, in order to ensure the thermal insulation effect of the thermal insulation layer 17, the materials used for the thermal insulation layer 17 in this embodiment are ultrafine glass wool felt, flame-retardant polystyrene foam board, flame-retardant rigid polyurethane foam on site, and rubber-plastic thermal insulation. Any one or a combination of board or other effective insulation materials
[0037] Further, as figure 2 As shown, both the high temperature shell and tube heat exchange device 11 and the low temperature shell and tube heat exchange device 12 include a refrigeration housing 2 having a refrigeration cavity 25, and one end of the refrigeration housing 2 has a cold water inlet 21 communicating with the refrigeration cavity 25. The other end has a cold water outlet 22 communicating with the refrigeration cavity 25, a heat transfer tube bundle 23 for refrigerant to circulate in the refrigeration shell 2, and a refrigerant inlet 234 and a refrigerant outlet 233 at both ends of the heat transfer tube bundle 23, respectively Extending to the outside of the refrigeration shell 2, more specifically, the heat transfer tube bundle 23 is longitudinally bent and arranged between the cold water inlet 21 and the cold water outlet 22, which includes a plurality of longitudinally arranged between the cold water inlet 21 and the cold water outlet 22 The longitudinal extension portions 231 and the longitudinal extension portions 231 are all arranged parallel to each other, and two adjacent longitudinal extension portions 231 are connected by an arc-shaped curved portion 232, and the arc-shaped curved portion 232 extends to the cold water inlet 21 and the cold water outlet respectively twenty two.
[0038] In order to increase the contact area between the water source medium and the heat transfer tube bundle 23 and improve the heat exchange effect, the shell is also provided to divert the water source medium flowing in from the cold water inlet 21 so that the water source medium passes through the heat transfer tube bundle 23 multiple times. In order to fully contact the heat transfer tube bundle 23 and flow out from the cold water outlet 22 of the diversion structure 24, more specifically, the diversion structure 24 includes a number of horizontally arranged from top to bottom between two adjacent longitudinal extensions 231 The baffle 241, corresponding to the density of the baffle 241 provided between the two adjacent longitudinal extensions 231 of the cold water inlet 21 or the cold water outlet 22, is as high as the baffles provided on both sides of the refrigeration shell 2 The density of the plate 241 gradually becomes smaller. The baffles 241 of the guide structure 24 meet the purpose of sufficient heat exchange between the water source medium and the heat transfer tube bundle 23 and improve the heat exchange effect.
[0039] A refrigeration control method for a dual-temperature dual-compressor chiller, the method includes:
[0040] A. Dual temperature refrigeration: The switching structure is controlled by the control module 18 so that the high temperature shell and tube heat exchange device 11 is connected with the low temperature shell and tube heat exchange device 12 and the medium temperature water inlet and outlet 13 at the same time, and the chilled water sent back from the load side passes through the high temperature return port 111 enters the high-temperature shell-and-tube heat exchange device 11 and exchanges heat with the refrigerant in the high-temperature compression refrigeration circuit 14 to achieve cooling. Part of the chilled water after cooling enters the low-temperature shell-and-tube heat exchange device 12, and continues to communicate with The refrigerant in the low-temperature compression refrigeration circuit 15 performs heat exchange and further cools down, and is finally delivered from the low-temperature water outlet 121 to the terminal equipment. Another part of the chilled water is diverted through the switching structure and then directly delivered to the terminal equipment through the medium-temperature water inlet and outlet 13; this implementation For example, in this step, the control module 18 can adjust the ratio of the water entering the low-temperature shell and tube heat exchanger 12 and the medium-temperature water inlet and outlet 13 according to the load requirements by adjusting the three-way valve to meet various requirements during the dual-temperature cooling process. Required load demand.
[0041] B. Production of low-temperature chilled water: When the unit is under high load, the control module 18 controls the switching structure so that the high-temperature shell and tube heat exchange device 11 is only connected to the low-temperature shell and tube heat exchange device 12, and all chilled water flows through The high temperature shell and tube heat exchange device 11 and the low temperature shell and tube heat exchange device 12 respectively exchange heat with the refrigerant in the high temperature compression refrigeration circuit 14 and the refrigerant in the low temperature compression refrigeration circuit 15, and finally pass through the low temperature water outlet 121 It is delivered to the terminal equipment; in this embodiment, the standard refrigeration condition of the low-temperature compression refrigeration circuit 15 is 7/10°C of supply and return water, and in this step, the maximum amount of 7-10°C chilled water is produced.
[0042] C. High-temperature chilled water production: When the unit is under low load, the control module 18 controls the switching structure so that the high-temperature shell and tube heat exchanger 11 is only connected to the medium temperature water inlet and outlet 13, and the chilled water only flows through the high-temperature shell and tube The heating device 11 performs heat exchange with the refrigerant in the high-temperature compression refrigeration circuit 14, and is finally transported from the medium-temperature water inlet and outlet 13 to the terminal equipment; in this embodiment, the standard refrigeration working condition of the high-temperature compression refrigeration circuit 14 is 10/19 ℃, max. 10℃-19℃.

Example Embodiment

[0043] Example two
[0044] Such as image 3 As shown, this embodiment is similar to the first embodiment, except that the heat transfer tube bundle 23 in this embodiment is arranged in the refrigeration housing 2 in a transversely curved manner, and the heat transfer tube bundle 23 includes a transverse extension 26 and an arc shape. The curved portion 232 and the lateral extension portion 26 are arranged horizontally from top to bottom and are parallel to the baffle 241. In this embodiment, the two sides of the baffle 241 are respectively fixed to the curved curved portion 232 and the refrigeration housing On the inner wall of 2, the top-down baffle 241 is staggered to guide the water source medium so that the water source medium flows from the cold water inlet 21 to the cold water outlet 22 along the heat transfer tube bundle, and the cooling in this embodiment The flow direction of the agent is from top to bottom, that is, from the lateral extension closest to the cold water outlet 22 to the lateral extension closest to the cold water inlet 21, so that the flow direction of the water source medium and the refrigerant are reversed to meet the needs of sufficient heat exchange .

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Description & Claims & Application Information

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