CN111520794A - Heat recovery heating system - Google Patents

As shown in fig. 1, the heat recovery heating system according to the embodiment of the present disclosure may be used to recover waste heat in a building such as a

110 and use the recovered heat for heating of a surrounding

120, a

130, and the like. Further, the heat recovery heating system of the embodiment of the present disclosure may be applied to any indoor space such as a building or a room provided with equipment that continuously generates heat during operation, for example, a data center, a machine room, or a high-temperature production plant.

In the operation process of the data center, a large amount of heat generated by IT equipment is dissipated to the outdoor environment through a cooling system, and in high-altitude areas with low temperature throughout the year, auxiliary buildings such as offices, operation and maintenance and dormitories and peripheral civil buildings matched with the data center need a large amount of heat to meet the requirement of heat supply in winter. At present, a large amount of non-renewable energy sources such as coal, natural gas and the like are generally consumed for heating by using boiler combustion, and a large amount of emissions such as dust, acid gas and the like generated by combustion cause serious pollution to the environment. The heat recovery and supply system provided by the embodiment of the present disclosure recovers waste heat in the

110, and supplies heat to surrounding rooms or buildings by using the recovered waste heat, where the surrounding rooms or buildings include other rooms in the building where the data center is located, and also include other buildings surrounding the building where the data center is located, and may be connected to a heat supply station to supply heat to buildings located far away. Therefore, the energy utilization efficiency can be improved, and the environmental pollution caused by heating in winter can be effectively reduced.

As shown in fig. 2, the heat recovery heating system includes a

200 and a

300. Wherein: the

200 includes a

210 and a

220. The

210 is provided with a

211 inside, and the

211 is used for cooling the air in the

110 by using a cooling fluid and obtaining heat in the air; the

220 is configured to obtain a heating fluid at a predetermined temperature by using heat obtained from the cooling fluid and output the heating fluid; the

300 is configured to provide heat using at least a heating fluid at a predetermined temperature.

According to the embodiment of the present disclosure, the

211 may be, for example, a heat recovery coil, the heat recovery coil is connected to the

220, and water supply and return interfaces of the heat recovery coil are respectively connected to the water supply and

402 and 401 on the heat source side of the heat pump. The connection pipeline is also provided with a circulating

501, and the circulating

501 can be specifically arranged on the heat source side

401 of the heat pump unit. Under the action of the circulating

501, the cooling circulating water with a low temperature delivered from the

221 of the

220 can be circulated to the heat recovery coil through the heat source side

402 of the heat pump unit. The heat recovery coil pipe cools all or part of the air in the machine room by using the cooling circulating water and absorbs the waste heat in the air, and the heat circulating water with higher temperature after absorbing the heat returns to the

221 of the

220 through the heat source side

401. The

220 performs work to utilize the heat carried by the thermal circulation water, and the heat is transferred to the heating fluid (for example, water) of the heat pump

222, so as to obtain the heating fluid (for example, hot water with a temperature of 80 ℃) at a predetermined temperature on the

222.

The

222 of the heat pump unit is connected to the

300 through a heat pump unit heat supply side

403 and a heat pump unit heat supply side

404. A circulating

502 is arranged on the connecting pipeline, and the circulating

502 is specifically arranged on the heat supply side

404 of the heat pump unit. Under the action of the circulating

502, the heating fluid with the predetermined temperature obtained from the

222 of the

220 can be circulated to the

300 through the heat pump unit hot side

403. The

300 provides heat to the

120 using heat carried by the heating fluid, which is delivered back to the

222 of the heat pump assembly after releasing the heat.

The water supply temperature of the

221 of the heat pump unit can be 16 ℃, and the water return temperature can be 21 ℃ so as to ensure that the air supply temperature of the heat pump unit reaches 25 ℃; the water supply temperature of the heat pump unit

222 can be 80 ℃, and the water return temperature can be 40 ℃.

As shown in fig. 3, a plurality of

111 and supporting facilities are provided in the

110, and after the data machine room is put into operation, the indoor hot return air temperature can be maintained at 35 to 37 ℃, which is a condition for long-term stable heat source. The indoor air of the

110 is circulated by using a circulating fan, a

210 is arranged on the air circulating loop, and a return

112, a hot

113, an air supply

114, an air

115 and a heat

116 are arranged in the data center. The heat dissipated by the

111 enters the

210 through the return

112 and the hot

113 along with the circulating air, and is cooled by the cooling effect of the

211 in the

210 to obtain the cooled circulating air, and meanwhile, the

211 absorbs the heat carried in the air. The cooled circulating air is delivered to the

111 through the

114 and the

115 to cool the

111. The air supply temperature of the

210 may reach 25 ℃ or lower. The heat absorbed by the

211 is circulated and transferred to the

221 of the

220 through the heat pump heat source side supply and return

402 and 401.

One or

210 may be provided for one

110, and one or

210 may be provided for one

220. In the embodiment of the present disclosure, the

110 is provided with not less than two cooling

210, and the waste heat recovered by the not less than two cooling

210 is transmitted to one

220.

As shown in fig. 4, according to an embodiment of the present disclosure, the

210 includes an indoor-side circulation fan 212 and a

213 in addition to the

211 shown in, for example, fig. 2 and 3. As will be understood by those skilled in the art, since the

211 also has a cooling function, the

213 will be hereinafter referred to as "

213" for the sake of distinction from the

211.

The

211, the indoor-side circulation fan 212, and the

213 are provided in this order in the direction from the indoor return air side to the air supply side of the

210. According to the embodiment of the present disclosure, in the first condition, the

211 and the circulation fan 212 are turned on, and the indoor air is cooled and heat recovered by the

211; in the second condition, the circulation fan 212 and the

213 are turned on, and the indoor air is cooled by the

213. Wherein the first condition includes being in a predetermined heating time period or the outdoor temperature being lower than a predetermined temperature, and the second condition includes being in a predetermined non-heating time period or the outdoor temperature being not lower than the predetermined temperature.

For example, a circulator blower may be disposed within the

210 for circulating air within the data center compartment. The side of the

210 receiving the high temperature air is the return air side, and the side discharged after cooling is the supply air side. The

211 may be disposed at an indoor air return side in the cooling unit, and the

211, the circulation fan 212, and the

213 may be disposed in order from the return air side to the supply air side.

Under the condition that the temperature is lower in winter, a heating mode is started, the heat recovery working condition is adopted for operation, meanwhile, the

211, the circulating fan 212, the

220 and the circulating water pumps 501 and 502 are operated, indoor air is cooled and heat recovered by the

211 and the

220, and recovered waste heat is used for heating.

Under the condition that the temperature is higher in non-winter, the

213 and the circulating fan 212 operate, the

211, the

220 and the circulating water pumps 501 and 502 are turned off, and the indoor air is cooled by the

213.

According to an embodiment of the present disclosure, the

210 may be, for example, an indirect evaporative cooling unit. In a high-altitude area with low ambient temperature all the year round, the indirect evaporative cooling unit can greatly reduce the energy consumption of the data center air conditioning system. The application prospect is wide at present. The heat recovery heating system provided by the embodiment of the disclosure can recover and supply heat to the waste heat of the data center based on the indirect evaporative cooling unit, namely, the heat recovery device is additionally arranged in the indirect evaporative cooling unit, so that the overall operation energy consumption of the data center can be further reduced.

The

213 includes an air-to-

2131 for cooling the indoor air with the outdoor air. The

213 may further include an outdoor

2132 and an outdoor side

2133, under the action of the outdoor

2132, indoor circulating air in the data center enters the air-to-

2131 through the outdoor side

2133, and indoor side air exchanges heat with outdoor side air in the air-to-

2131 to cool indoor side air (to reach an indoor side air supply temperature of 25 ℃).

The

210 may also include a

214. When the outdoor environment temperature is relatively high and the heat exchange capability of the

213 is insufficient, for example, the heat exchange capability of the

213 cannot guarantee that the indoor supply air temperature reaches 25 ℃, the

214 may be turned on to perform supplementary cooling on the indoor air to ensure that the supply air temperature reaches 25 ℃, and the

214 may be a DX (mechanical refrigeration) cooling coil, for example.

As shown in fig. 5, according to an embodiment of the present disclosure, the

300 includes a

310 and a

320. The

310 at least collects the heat supply fluid delivered by the plurality of

220 and distributes the heat supply fluid to the

320. The

320 obtains a terminal circulating fluid of a predetermined temperature using the heating fluid delivered from the

310 and delivers the terminal circulating fluid to the

120 for heating.

According to the embodiment of the present disclosure, one or more

220 and one or more

320 may be provided for each

310.

For example, the

310 may be deployed within a data center campus. The

310 may be adapted with a number of

200 to utilize a plurality of

200 to deliver heat sources to the

310. Meanwhile, the

310 may be adapted with a plurality of user

320 to supply heat to a plurality of

120.

The

200 is responsible for waste heat recovery in the data center as part of the heat source for the heating system.

The

310 is responsible for collecting heat from the

200, and the

310 is connected to the

220 to collect heat and distribute heat (e.g., heat carried by hot water) to the user

320 according to load demands and operation of the environmental control system.

The

320 is a control distribution part of the heating system and is responsible for producing end circulation fluid (for example, hot water with a temperature of 60 ℃ or 75 ℃) with different temperatures according to the actual demand of the

120, and the

120 is a heat consumption part of the heating system. The

320 is provided with a

321, primary side water supply and return

431 and 432 of the

321 are connected to the

310, and secondary side water supply and return

433 and 434 of the

321 are connected to the

120. The heat supply fluid of the predetermined temperature collected by the

310 enters one side of the

321 through the primary

431 of the

321, the

320 exchanges heat with the heat supply fluid of the one side to obtain the terminal circulation fluid of the predetermined temperature of the other side, and the terminal circulation fluid is delivered to the

120 through the secondary

433 for supplying heat.

The primary-side water supply/

431 is provided with a three-

621. The opening of the electric three-

621 can be controlled according to the load demand of the end heat user to adjust the water supply amount entering the

321. The surplus water supply is directly returned to the primary

432 of the heat exchanger through the

435, thereby adjusting the heating output of the

310.

According to an embodiment of the present disclosure, the

200 may be connected to a

310, which applies heat to a building located at a relatively long distance, and a heat exchange station, which may produce hot water at different temperatures for delivery to the

120 according to the actual demand of the end heat consumer.

As shown in fig. 6, according to an embodiment of the present disclosure, the

310 may include a heat supply station

311 for being turned on in case the

200 fails to supply heat or is insufficient in heat supply capacity, to supply heat to the

320 as a backup heat source. The heat supply plant

311 may be, for example, an electric boiler, and supplies heat as a backup heat source. As will be understood by those skilled in the art, since the

200 each also have the function of a heat source, the heat supply station

311 will be hereinafter referred to as "second

311" for the sake of distinction from the

200.

According to the embodiment of the present disclosure, the heat supply station may further include a

312, configured to store heat by using the

220 or the second

311 during the period of low-ebb power supply of the power grid, and provide heat to the

320 during the period of peak power supply of the power grid. The

312 may be, for example, a heat storage tank that stores hot water to regulate the operation of the heating system.

The

310 may also include a circulating water pump (511/512) and an electrically operated valve (611-.

Wherein: in the heat pump unit heat supply mode, the

220 is used alone to supply heat to the

320; in the second heat-source device heat supply mode, the second heat-

311 is solely used to supply heat to the

320; in the thermal storage device heating mode, the

312 is utilized alone to provide heat to the

320; in the thermal storage device heat storage mode, the

220 or the second

311 supplies a part of the heat to the

320, and the other part of the heat is supplied to the

312, so that the

312 stores the heat.

As shown in fig. 7, in the heat pump unit independent heating mode, the fluid flow path in the

310 is shown by the thick line in the heating station. In this case, the

310 may collect a plurality of

220 and then directly deliver the hot water to the

320.

When the

110 is in a stable service operation, the

220 can operate the heat pump unit independent heating mode a under the condition that a stable heat source can be provided. In the operation mode, the

210 and the

220 in the data center are started to work, the heat pump unit heat source circulating

501 and the heat supply circulating

502 are operated, the

611 is opened, other electric valves are cut off, and the heat pump unit heat supply and return

403, 411 and 404 and the heat supply pipe network heat supply and return water

417 and 418 conveyed to the user

320 are connected.

Under the independent heat supply mode of heat pump set, the water supply route in the heat supply station is: the hot water output by the heat pump unit passes through the heat supply side

403 and 411 of the heat pump unit, is connected to the water supply main 417, and then enters the

320. The hot water becomes cold water after heat is dissipated in the

320 through heat exchange, the heat exchange station conveys the heat

220, and a return water path in the heat supply station is as follows: the cold water output by the heat exchange station returns to the

220 through the

418 and the heat pump unit hot side

404. The cold water is only low in temperature relative to the hot water before the heat exchanger, and does not mean water with a very low temperature.

As shown in fig. 8, when the

110 is in the initial operation of the service, and the

220 cannot provide a stable heat source or the

220 is in the maintenance failure condition, the second heat source device independent heating mode B may be turned on. In the second heat source equipment independent heating mode, the fluid flow path in the heating station is as shown by the thick line in the heating station. In the operation mode, the

210, the

220, the heat pump unit heat source circulating

501 and the heat supply circulating

502 in the data center stop operating, the second

311 and the second heat source equipment heat supply circulating water pump 511 start operating, the

613 and 616 are opened, other electric valves are cut off, the second heat source equipment water supply and return pipelines (413, 415/414 and 416) are respectively communicated with the heat supply and return pipe network water supply and return

417 and 418, and the second

311 independently supplies heat to the user

320.

Under the independent heat supply mode of second heat source equipment, the water supply route in the heat supply station is: the hot water output from the second

311 passes through the second heat source device

413 and 415, is introduced into the

417, and then enters the

320 through the

417. The return water path in the heat supply station is as follows: cold water output from

320 is returned to second heat-

311 via

418 and second heat-source device

416 and 414.

As shown in fig. 9, when the user

320 is under a condition of a small heat load or a power grid is in a peak power supply period, the heat storage device independent heating mode C is turned on. In the heat storage device independent heating mode, the fluid flow path in the heating station is as shown by the thick lines in the heating station. In the operation mode, the

210, the

220, the heat pump unit heat source circulating

501, the heat supply circulating

502, the second

311 and the second heat source equipment heat supply circulating water pump 511 stop operating, the heat storage equipment heat supply circulating

512 starts operating, the

617 is opened, other electric valves are cut off, the heat storage equipment heat supply and return

419 and 420 at the heat supply side are communicated with the heat supply and return water

417 and 418 of the heat supply pipe network, and the

312 independently supplies heat to the user

320.

Under the independent heat supply mode of heat accumulation equipment, the water supply route in the heat supply station is: hot water output from the

312 enters the

320 through the thermal storage device heating-side

419 and the

417. The return water path is as follows: cold water output by the heat exchange station is returned to the

312 via a

418 and a thermal storage device heat supply side

420.

As shown in fig. 10, if the heat storage mode of the heat storage device is started under the independent heat supply condition of the heat pump unit, the devices, the water pump and the valves in the independent heat supply mode of the original heat pump unit are all kept in the original state, and then the

612, 614, 615 and 616 are opened. A part of hot water in a hot water supply side

403 of the heat pump unit is connected to a water supply main 417 through a

411 to supply heat to the

320; another portion of the hot water is supplied to the thermal storage device through a portion of the piping 412 and the

413. The heat storage device return water is connected to a heat supply pipe network

418 through a part of pipelines of the

414 and the

416, so that heat storage of the

312 by the

220 and heat supply of the heat exchange station are realized.

As shown in fig. 11, if the heat storage mode of the heat storage device is turned on under the independent heat supply condition of the second heat source device, the water pump and the valve under the independent heat supply condition of the original second heat source device are all kept in the original state, and then the electrically operated

614 and 615 are opened. A part of the hot water in the second heat source equipment

413 is connected to a

417 through a

415; the other part supplies water to the

312. The return water of the heat storage tank is connected to a

414 of the second heat source device, so that the second heat source device can store heat in the heat storage and

312 and supply heat to the heat exchange station.

As shown in fig. 6 to 11, according to an embodiment of the present disclosure, the heat recovery heating system further includes a pipe network, the pipe network including: the system comprises heat pump unit heat source side water supply and return

402 and 401, heat pump unit heat source side water supply and return

403 and 411, second heat source equipment water supply and return

413 and 414, heat storage equipment heat supply and return

419 and 420, water supply and return

417 and 418, heat exchange station primary side water supply and return

431 and 432, and heat exchange station secondary side water supply and return

433 and 434.

The heat pump unit heat source side water supply and return

402 and 401 connect the

210 and the

220.

The heat pump unit heat supply and water supply and return

403, 411 and 404 are connected with the

220 and the water supply and return

417 and 418, and are connected with the

220 and the

312.

The second heat source equipment water supply and return

413 and 414 and 416 are connected with the second

311 and the water supply and return

417 and 418, and are connected with the second

311 and the

312.

Heat storage device hot and hot side water supply and return

419 and 420 connect the

312 and water supply and return

417 and 418.

The water supply and return

417 and 418 are connected with primary side water supply and return

431 and 432 of the heat exchange station; secondary side water supply and return

433 and 434 of the heat exchange station connect the

320 with end users.