JP2006313059A - Pseudo-closed type cold/hot water circulation system for energy saving air-conditioning, and fluid conveying system of low loss - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To save energy in an open type cold/hot water circulation system using a heat storage tank, and to save energy in a fluid conveying system. <P>SOLUTION: This pseudo-closed type cold/hot water circulation system is constructed to eliminate an actual head by maintaining a piping inside of an open system portion under a vacuum condition, in the open type cold/hot water circulation system using the heat storage tank, in an air-conditioning heat source system, so as to reduce total capacity of circulation pump power due to constitution of the cold/hot water circulation system of low pressure loss. The fluid conveying system of low pressure loss is constructed by maintaining the piping inside of the open system portion under a vacuum condition to reduce total capacity of conveying pump power, so as to constitute fluid conveying system of low pressure loss, in the fluid conveying system. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to an open type cold / hot water circulation system using a heat storage tank in an air-conditioning heat source system, in order to reduce the total capacity of the circulation pump power for the purpose of energy saving, and a pseudo-sealed type in which the actual head of the open system part is eliminated. By constructing a chilled / hot water circulation system, a low-pressure-loss chilled / warm water circulation system with only a head loss has been constructed, and the total capacity of the circulation pump power has been reduced. In order to reduce the total capacity of the pump power in the system, a fluid transfer system with a reduced actual head height is maintained by maintaining the inside of the piping in the open system part in a vacuum, and the total head of the pump can be reduced only to the loss head. By constructing a low pressure loss fluid transfer system, The present invention relates to a low-loss fluid conveyance system with reduced capacity.

Development of energy saving technology is an urgent issue to protect the global environment. With the entry into force of the Kyoto Protocol, the greenhouse gas reduction target of 6% compared to 1990 is now 7.6% higher than that of 1990 (2002). For this reason, a reduction of 13.6% is required on the current basis. The proportion of air conditioning energy in the energy consumption of commercial buildings is very high. Among them, the conveyance energy occupies a large weight. This reduction in transport energy is the main focus of energy saving, and the development of energy-saving technology for reducing transport energy is an urgent issue. This system is highly versatile, and the amount of greenhouse gas reduction is estimated to be approximately 1.89 million tons per year when converted to CO2 emissions on a nationwide scale (estimated with current monetary conversion, approximately 60 billion yen per year) Reduction is expected.
Further, in a fluid conveyance system such as cooling water or liquid in a power plant or factory, the conveyance energy occupies a large weight. The development of energy-saving technology for reducing carrier energy is an urgent issue. This system is highly versatile, and the amount of greenhouse gas reduction is estimated to be several million tons per year when converted to CO2 emissions on a nationwide scale (estimated by current amount conversion, several hundred billion yen annually) ) Reduction is expected.

Conventionally, in an open-type cold / hot water circulation system using a heat storage tank in an air conditioning heat source system, the total capacity of the circulation pump power requires a large capacity because an actual head is added in addition to the loss head. Even if the actual head of the heat exchanger secondary side is extinguished by using a heat exchanger, the primary side of the heat exchanger and the open system part of the primary side of the heat source equipment are not equipped with a water fall prevention valve or foot. Valves and the like added an actual head in addition to a large head loss, and the circulation pump power required a large total capacity.
In addition, in a fluid conveyance system such as cooling water or liquid in a power plant or factory, the flow rate is large, so an actual head is added in addition to the head loss, and the circulation pump power requires a large total capacity.

In an open-type cold / hot water circulation system using a heat storage tank in an air-conditioning heat source system, an open-type cold / hot water circulation system in which the actual head is eliminated for the open system part on the primary side of the heat exchanger and the open system part on the primary side of the heat source equipment Has never existed.
Moreover, in the fluid transport system for cooling water, liquid, and the like, there has not been a fluid transport system in which the actual head is reduced for the open system part.

In an open-type cold / hot water circulation system using a heat storage tank in an air conditioning heat source system, when using a heat exchanger when the actual head exceeds 7 m, it is important to use a low-loss heat exchanger. Generally, a heat exchanger has a fluid separation function that does not mix two different fluids. Configuration of systems with different operating pressures such as open and closed systems. Pressure adjustment function to remove back pressure and shut off pressure for the purpose of preventing falling water and protecting heat source equipment. Antifouling function that prevents primary fluid from being mixed with secondary fluid. Since it was used for the purpose of preventing corrosion that prevents the corrosive components of the primary fluid from being mixed with the secondary fluid, and what was used for that purpose was used, the emphasis was placed on heat exchangers aimed at low pressure loss. It wasn't. In the cold / hot water circulation system for air conditioning for the purpose of energy saving, in order to reduce the total capacity of the circulation pump output, low temperature difference, 1 ℃ or less, high efficiency, 99.5% or more and low A more efficient system can be constructed by combining a low-loss heat exchanger with a pressure loss and a primary pressure loss of 3 m or less and a secondary pressure loss of 3 m or less. As a result, it is possible to realize a pseudo hermetic cold / hot water circulation system that eliminates the entire actual head and that has a low pressure loss.
In addition, when the actual lift is low and the flow rate is large in a fluid transfer system such as cooling water or liquid, a low-loss fluid transfer system that reduces the actual lift for the open system part can achieve great energy savings. it can.
Patent Document 1 below discloses an example of an air conditioning system using heat storage means. Further, Patent Document 2 below discloses a filtration device using the principle of siphon.
Japanese Patent Laid-Open No. 05-052442 (Japanese Patent No. 2037422) Japanese Patent Laid-Open No. 2004-081925

In order to protect the global environment, the promotion of energy conservation is an urgent issue for the country. Here, in the open type cold / hot water circulation system using the heat storage tank in the air conditioning heat source system, for the purpose of energy saving, the entire actual head including the open system part of the cold / hot water circulation system for air conditioning is eliminated, and the cold / hot water circulation for air conditioning This greatly reduces the total capacity of pump power.
In order to reduce the total capacity of pump power in the fluid transfer system for cooling water and liquid, etc., a fluid transfer system with a reduced actual head is constructed by maintaining the inside of the open system piping in a vacuum, By constructing a low-pressure-loss fluid conveyance system with the entire head of the pump having only a loss head, the total capacity of the pump power is greatly reduced.

The principle of the present invention is the application of the siphon principle as a natural law. In general, when this system exists in atmospheric pressure, if the inside of the open system piping in the open-type cold / hot water circulation system is kept in vacuum, the internal cold / warm water is pushed to atmospheric pressure, theoretically 1 atm. The water level rises to about 10m. For this reason, while the actual head of the open system portion disappears, those that cause pressure loss, such as a water fall prevention valve and a foot valve, can be omitted, and the total head can be greatly reduced. This system makes it possible to significantly reduce the total head, and the total capacity of the circulating pump power due to the reduction of the total head is greatly reduced. Thereby, the running cost of the cold / hot water circulation system for an air conditioning can be reduced significantly, and energy saving can be implemented.
The principle of the present invention is that, in a fluid transfer system such as cooling water or liquid, when the present system exists in atmospheric pressure, the internal fluid is brought to atmospheric pressure if the inside of the open system pipe is kept in vacuum. The water level rises to about 10m theoretically at 1 atm. For this reason, while the actual head of the open system portion is reduced, those that cause pressure loss such as a foot valve can be omitted, and the total head can be greatly reduced. This system makes it possible to significantly reduce the total head, and the total capacity of the pump power due to the reduction of the total head is greatly reduced. Thereby, the running cost of a fluid conveyance system can be reduced significantly, and energy saving can be implemented.

The maximum rising water level in this system is set to 7 m in consideration of the boiling temperature of cold / hot water. The part exceeding 7 m is separated by a heat exchanger, etc., and the secondary side of the heat exchanger, etc. is closed-type cold / hot water circulation System. In order to maintain the inside of the piping of the open system part in a vacuum, a leakage replenishment water pipe with an automatic air vent valve with a check valve is installed at the top position of the open system part of the cold / hot water circulation system. The inside of the pipes can be kept in vacuum. (FIG. 1).
Similarly, in a low-loss fluid conveyance system such as cooling water or liquid, in order to maintain the inside of the piping of the open system portion in a vacuum, a check valve is provided at the uppermost position of the piping of the open system portion in the fluid conveyance system. Install a leak replenishment water pipe equipped with an automatic air vent valve so that the inside of the open system piping can be maintained in vacuum. (Fig. 7)

In order to maintain the inside of the piping of the open system part in a vacuum, a quasi-sealed type with a leak replenishment water pipe with an automatic air vent valve with a check valve installed at the top position of the pipe of the open system part in the cold / hot water circulation system In a cold / hot water circulation system, if leaking gas or springing gas is continuously generated depending on the system condition, a vacuum pump is installed on the secondary side of the automatic air vent valve so that the inside of the open system piping can be kept in vacuum. Then, suction is performed with a vacuum pump. (Figure 3).
Similarly, in low-loss fluid conveyance systems such as cooling water and liquids, in order to maintain the inside of the piping of the open system portion in a vacuum, the check is placed at the top position of the piping of the open system portion in the fluid conveyance system. In a fluid transfer system equipped with a leak replenishment water pipe equipped with a valve-equipped automatic air vent valve, if a leaked gas or a spring gas is continuously generated depending on the system status, a vacuum pump is installed on the secondary side of the automatic air vent valve. Installed and suctioned by a vacuum pump so that the inside of the open system piping can be maintained in vacuum. (Fig. 8)

The maximum rising water level in this system is set to 7 m in consideration of the boiling temperature of cold / hot water. The parts exceeding 7 m are separated by a heat exchanger, etc., and the secondary side of the heat exchanger, etc. is closed-type cold / hot water circulation System. For heat exchangers, etc. used for closed chilled / hot water circulation systems, a more efficient system can be constructed by combining low-loss heat exchangers, eliminating the entire actual head and reducing low pressure loss. A pseudo hermetic cold / hot water circulation system can be realized.

In order to prevent reverse leakage, the pipes in the open system part of the quasi-sealed cold / hot water circulation system for air conditioning are kept in a vacuum, so that the pump is a mechanical seal water seal type and the valve is a sealed type. Is used. In addition, for a slight leak, a leak replenishment water pipe is installed to replace the retained replenishment water with the leaked air and the spring air, thereby maintaining the inside of the piping in the open system part in a vacuum.
Moreover, about the part which maintained the inside of piping of the open system part in fluid conveyance systems, such as a cooling water and a liquid, using a thing with little reverse leakage. In addition, for a slight leak, a leak replenishment water pipe is installed to replace the retained replenishment water with the leaked air and the spring air, thereby maintaining the inside of the piping in the open system part in a vacuum.

  In order to separate the chilled / hot water flow rate on the primary side and the chilled / hot water flow rate on the secondary side of the chilled / warm water circulation system, a header connection pipe is provided between the outgoing and return headers, allowing free flow of effluent / inflow. Give the degree (Figure 1).

In the case of having a heat storage device dedicated to heat storage In the open-type cold / hot water circulation system using a heat storage tank in an air-conditioning heat source system, a check valve is provided at the uppermost position of the open system partial pipe to maintain a vacuum inside the open system partial pipe In order to prevent reverse leakage, install a leakage replenishment water pipe equipped with an automatic air vent valve, and in order to prevent reverse leakage, the pump has a mechanical seal water seal type, the valve has a sealed type, etc. Use an unoccupied part and maintain the inside of the open system piping in a vacuum. As a result, the total head of the circulation pump of the open-type cold / hot water circulation system is changed to a low-pressure loss cold / hot water circulation system with only a loss head, and the total capacity of the circulation pump power is greatly reduced by reducing the total head of the circulation pump. , Establish a pseudo-enclosed cold / hot water circulation system for energy-saving air conditioning (Fig. 1).

  Depending on the system condition, when continuously generating leaking gas or springing gas, install a vacuum pump on the secondary side of the automatic air vent valve and use a vacuum pump so that the inside of the open system piping can be maintained in vacuum. Aspirate (Figure 3).

The initial filling method for the piping of the open system part is to close the initial adjustment gate valve and open the valve of the system initial filling pipe to charge the water. Air in the piping of the open system part of the open type cold / hot water circulation system is discharged from the automatic air vent valve. Then, when the valve of the system initial charging pipe is closed and the initial adjustment gate valve is opened, the charging in the leakage replenishment water pipe and the air under the initial adjustment gate valve are replaced. By repeating this operation again, all the air in the piping of the open system part is discharged.
Similarly, in the low-loss fluid conveyance system for cooling water and liquid, the initial filling method for piping in the open system part is to close the initial adjustment gate valve and open the system initial filling pipe valve for filling. Do water. The air in the piping of the open system part of the system is discharged from the automatic air vent valve. Then, when the valve of the system initial charging pipe is closed and the initial adjustment gate valve is opened, the charging in the leakage replenishment water pipe and the air under the initial adjustment gate valve are replaced. By repeating this operation again, all the air in the piping of the open system part is discharged.
(Fig. 7)

When the heat exchanger primary pump or heat source equipment primary pump is operated, the air in the leakage replenishment water pipe is discharged from the automatic air vent valve by the operating pressure of the system. The automatic air vent valve is equipped with a check valve to prevent reverse leakage of air when the system is stopped.
Similarly, in a low-loss fluid conveyance system such as cooling water or liquid, when the fluid conveyance pump is operated, the air in the leakage replenishment water pipe is discharged from the automatic air vent valve by the operating pressure of the system. The automatic air vent valve is equipped with a check valve to prevent reverse leakage of air when the system is stopped. (Fig. 7)

Even if the primary heat pump of the heat exchanger or the heat source equipment primary pump is stopped, the inside of the open system part of the open-type cold / hot water circulation system is maintained in vacuum, so that the pipe of the open system part is filled. Is maintained.
Similarly, in low-loss fluid conveyance systems such as cooling water and liquids, even if the operation of the fluid conveyance pump stops, the inside of the piping of the open system portion of the low-loss fluid conveyance system is maintained in vacuum. The water in the piping of the system part is maintained. (Fig. 7)

  The cool / warm water flow header (SH-1) and the cool / warm water return header (RH-1) are connected by a header connecting pipe, and the cold / warm water primary side circulation flow rate and the cold / warm water secondary side circulation flow rate are In addition, the degree of freedom of the inflow / outflow flow rate is given (FIG. 1).

The start / stop schedule setting unit is installed so that the cold / hot water primary pump and the cold / hot water secondary pump of the heat exchanger are driven by the same motor, and the start / stop of the motor can be performed in the time zone specified in the schedule. In addition, in order to adopt a variable flow rate system based on the return temperature of the chilled / hot water circulation system, an inverter speed control device is provided so that the chilled / hot water circulation flow rate control can be performed within the setting range of the maximum value flow rate and the minimum value flow rate. A system in which the primary side and secondary side cold / hot water circulation flow rate of the system can be controlled by one circulation pump set can be constructed as a system.
In order to use a variable flow rate system based on temperature and flow rate in the fluid transfer system such as cooling water and liquid, an inverter speed control device is installed so that the flow rate control can be performed within the setting range of the maximum value flow rate and the minimum value flow rate. A low-loss fluid conveyance system that can control the flow rate by reducing the conveyance power can be constructed as a system by suppressing the increase in the flow rate by configuring the low-pressure loss system with only the loss head in the total head of the pump.

  The maximum rising water level limit in this system is set to 7 m in consideration of the boiling temperature of cold / hot water. The part exceeding 7 m is separated by a heat exchanger or the like, and a closed type cold / hot water circulation system is constructed. The heat exchanger has a temperature difference between primary cold water and secondary cold water of 1 ° C. or less, a heat exchange rate of 99.5% or more, and a primary pressure loss of 3 m or less, and a secondary pressure loss of 3 m. By using the following low-loss heat exchanger (utility model registration No. 3101981), a cold / hot water circulation system with a lower pressure loss can be constructed.

In case of heat storage combined heat source equipment In an open type cold / hot water circulation system that uses a heat storage tank in an air conditioning heat source system, an automatic check valve is installed at the uppermost position of the open system partial pipe to maintain a vacuum inside the open system partial pipe. In order to prevent reverse leakage, install a leakage replenishment water pipe with an air vent valve, and prevent reverse leakage of the equipment installed in the negative pressure section, such as a mechanical seal water seal type and a valve sealed type. By using an object, it is possible to maintain the inside of the piping of the open system part in a vacuum, so that the total head of the circulation pump of the open type cold / hot water circulation system can be reduced to a low pressure loss pseudo hermetic type cold / hot water circulation system with only a loss head. By constructing it, we will build a cold / hot water circulation system for energy-saving air conditioning that greatly reduces the total capacity of the circulation pump power (Figure 2).

  The switching valves 1, 2, 3, and 4 are provided so that the heat storage and heat dissipation combined heat source device can be used in the heat storage mode and the heat dissipation mode (FIG. 2).

  Depending on the system condition, if a leaking gas or a springing gas is continuously generated, a vacuum pump is installed on the secondary side of the automatic air vent valve so that the inside of the open system piping can be maintained in vacuum. Aspirate (Figure 4).

  In the cold and hot water circulation system, the initial water filling method inside the pipe of the open system portion is performed by closing the initial adjustment gate valve and opening the valve of the system initial water pipe to charge the water. The air in the piping of the open system part is discharged from the automatic air vent valve. Then, when the valve of the system initial charging pipe is closed and the initial adjustment gate valve is opened, the charging in the leakage replenishment water pipe and the air under the initial adjustment gate valve are replaced. By repeating this operation again, all the air in the open system part is discharged (FIG. 2).

  When the heat exchanger primary pump or the heat source equipment primary pump is operated, the air in the leakage replenishment water pipe is discharged from the automatic air vent valve by the operating pressure of the system. The automatic air vent valve is equipped with a check valve to prevent reverse leakage of air when the circulation pump is stopped.

  Even if the operation of the heat exchanger primary pump or the heat source equipment primary pump is stopped, the inside of the open system part of the open system part of the open type cold / hot water circulation system is maintained in vacuum, so that the inside of the open system part of the pipe is filled. Water is maintained.

  The cool / warm water flow header (SH-1) and the cool / warm water return header (RH-1) are connected by a header connecting pipe, and the cold / warm water primary side circulation flow rate and the cold / warm water secondary side circulation flow rate are In addition, the degree of freedom of the inflow and outflow is given.

  The start / stop schedule setting unit is installed so that the cold / hot water primary pump and the cold / hot water secondary pump of the heat exchanger are driven by the same motor, and the start / stop of the motor can be performed in the time zone specified in the schedule. In addition, in order to adopt a variable flow rate system based on the return temperature of the chilled / hot water circulation system, an inverter speed control device is provided so that the chilled / hot water circulation flow rate control can be performed within the setting range of the maximum value flow rate and the minimum value flow rate. A system in which the primary side and secondary side cold / hot water circulation flow rate of the system can be controlled by one circulation pump set can be constructed as a system.

  The maximum rising water level in this system is set to 7 m in consideration of the boiling temperature of cold / hot water. The portion exceeding 7 m is separated by a heat exchanger, etc., and the secondary side of the heat exchanger, etc. is sealed cold / hot water circulation system A pseudo hermetic cold / hot water circulation system is constructed. The heat exchanger has a temperature difference of 1 ° C. or less between the primary cold water and the secondary cold water, a heat exchange rate of 99.5% or more, and a primary pressure loss of 3 m or less, and a secondary pressure loss of 3 m. By using the following low-loss heat exchanger (utility model registration No. 3101981), a more efficient, low-pressure-loss quasi-sealed cold / hot water circulation system can be constructed.

  Regarding the operation on the primary side of the combined heat source device, the valves 3 and 4 are closed and the valves 1 and 2 are opened. The air inside the pipe of the open system part is discharged from the automatic air vent valve by the gravity pressure of the cold / hot water in the upper part of the pipe. Thereafter, when the valves 1 and 2 are closed and the valves 3 and 4 are opened, the water in the leakage replenishment water pipe and the air under the valves 3 and 4 are replaced. By repeating the same action again, the air in the open system part is discharged and the inside of the pipe is maintained in vacuum, so that the water inside the pipe in the open system part is maintained.

Since the valves 3 and 4 and the valves 1 and 2 fall when they are opened simultaneously, the valves 3 and 4 or the valves 1 and 2 are always opened under the condition that the valves 1 and 2 or 3 and 4 are closed. (FIG. 2).

In the open type cold / hot water circulation system using the heat storage tank in the air conditioning heat source system, the total capacity of the circulation pump power can be reduced by incorporating the pseudo hermetic cold / hot water circulation system.
An example of the reduction in the total capacity of the circulation pump power by incorporating the pseudo hermetic cold / hot water circulation system in the open type cold / hot water circulation system using the heat storage tank in the air conditioning heat source system is as follows. This is an example, and the effect of the present invention is not limited to this calculation result.

Generally, the capacity of the circulation pump power is
"Number 1"
P = ρgQΣH / η (kW)
P Capacity of circulating pump power (kW) ρ density (kg / L) g Gravity acceleration 9.81
(M / s ² )
Q Flow rate of cold / hot water (m ³ / s) ΣH Total head (m) η Pump efficiency

The capacity of the circulation pump power in the open-type cold / hot water circulation system is
"Number 2"
P ₀ = ρgQ (H _H2 + H _L0 ) / η (kW)
Capacity of secondary circulation pump power (kW) in P ₀ open type cold / hot water circulation system
Actual head of secondary circulation pump in H _H2 open type cold / hot water circulation system (m)
Head loss (m) in H _L0 open type cold / hot water circulation system

The capacity of the circulation pump power in the pseudo hermetic cold / hot water circulation system is
"Equation 3"
P ₁ + P ₂ = ρgQ [(H _H1 + H _L1 + H _X1 ) + (H _X2 + H _L2 )]
/ Η (kW)
P ₁ volume of the primary circulation pump power in the pseudo sealed cold and hot water circulation system (kW)
P ₂ capacity of the secondary circulation pump power in the pseudo sealed cold and hot water circulation system (kW)
H ₁ Actual circulation head (m) of the primary circulation pump in the pseudo hermetic cold / hot water circulation system (pseudo
H _H1 = 0 for closed cold / hot water circulation system
Primary head loss (m) in H _L1 pseudo-sealed cold / hot water circulation system
Secondary head loss head (m) in H _L2 pseudo-sealed cold / hot water circulation system
Primary pressure loss of H _X1 heat exchanger (m)
Secondary pressure loss of H _X2 heat exchanger (m)

Since H _L0 is approximately H _L1 + H _L2 in this equation, the difference in the total capacity of the circulation pump power is
H _H2 − “H _H1 + (H _X1 + H _X2 )” = H _H2 − (H _X1 + H _X2 )
It becomes. (H _H1 = 0 because of pseudo-sealed cold / hot water circulation system)

For this reason, the one where the pressure loss ( _HX1 + _HX2 ) of a heat exchanger is smaller can implement more efficient energy saving. If (H _X1 + H _X2 ) is sufficiently smaller than H _H2 , the total capacity of the circulation pump power can be greatly reduced.

  The reduction amount of the total capacity of the pump power by incorporating the low-loss fluid conveyance system in the fluid conveyance system such as cooling water and liquid is as follows.

In general, the capacity of the pump power is
"Equation 4"
Ps ₁ = ρgQΣH / η (kW)
Capacity of Ps ₁ conveying pump power (kW) ρ density (kg / L) g gravity acceleration 9.81 (m / s ² )
Q Flow rate (m ³ / s) ΣH Total head (m) η Pump efficiency

The capacity of the pump power in the low loss fluid conveyance system is
"Equation 5"
Ps ₂ = ρgQ (H _H + H _L ) / η (kW)
Capacity of power of transport pump (kW) in Ps ₂ low loss fluid transport system
Actual head of the transport pump in the H _H low-loss fluid delivery system (m) (low loss fluid delivery
Because of the system, H _H = 0)
Loss head (m) in _HL low loss fluid transfer system

The capacity of the transfer pump power in the low-loss fluid transfer system is
"Equation 6"
Ps ₂ = ρgQ (H _L ) / η (kW)

For this reason, if the loss head H _{L is} relatively small with respect to the actual head H _H , the total capacity of the conveyance pump power can be greatly reduced.

The pseudo-sealed cold / hot water circulation system has a low temperature difference, a primary side cold / hot water temperature difference of 1 ° C. or less, a high efficiency, a heat exchange rate of 99.5% or more, and a low Combining low-loss heat exchangers with pressure loss, primary side pressure loss H _X1 3m or less, and secondary side pressure loss H _X2 3m or less constitutes a more efficient low pressure loss quasi-enclosed cold / hot water circulation system Therefore, the total capacity of the circulating pump power can be greatly reduced.

Example of pseudo air-conditioning system for air conditioning in hospital facilities Example of facility with open-type cold / hot water circulation system using heat storage tank in air conditioning heat source system

In the case of an open-type cold / hot water circulation system, the total capacity of the cold / hot water circulation pump power is
8 cold / hot water circulation secondary pumps (Q = 4,980 L / min 55m 75kW)
600kW
1 cold / hot water circulation secondary pump (Q = 2,600 L / min 55m 45kW)
45kW
Subtotal 645kW
Two cold / hot water circulation primary pumps (Q = 8,100 L / min 30m 55kW)
110kW
Two cold / hot water circulation primary pumps (Q = 8,100 L / min 25m 45kW)
90kW
Two cold / hot water circulation primary pumps (Q = 6,600 L / min 26m 45kW)
90kW
Two cold / hot water circulation primary pumps (Q = 6,250 L / min 27m 37kW)
74kW
Subtotal 364kW
Total 1,009kW
H _H2 30m H _L0 25m (System loss head 10m Water fall prevention valve 15m
Foot valve 0m) H _H1 5m H _L1 25m (system loss head 10m
Fall prevention valve 15m Foot valve 0m)

In the embodiment incorporating the pseudo hermetic cold / hot water circulation system of the present invention, the total capacity of the cold / hot water circulation pump power is
8 cold / hot water circulation secondary pumps (Q = 4,980 L / min 13m 18.5kW)
148kW
1 cold / hot water circulation secondary pump (Q = 2,600 L / min 13m 11kW)
11kW
Subtotal 159kW
Two cold / hot water circulation primary pumps (Q = 8,100 L / min 13m 30kW)
60kW
Two cold / hot water circulation primary pumps (Q = 8,100 L / min 13m 30kW)
60kW
Two cold / hot water circulation primary pumps (Q = 6,600 L / min 13m 22kW)
44kW
Two cold / hot water circulation primary pumps (Q = 6,250 L / min 13m 22kW)
44kW
Subtotal 208kW
Total 367kW

The total capacity of the chilled / hot water circulation pump power in the open chilled / hot water circulation system is
The total capacity of the chilled / hot water circulation pump power in the pseudo hermetic chilled / hot water circulation system maintaining the same function is 371 kW. For this reason, the implementation of the present invention is 367 kW after implementation, compared to 1,009 kW before implementation, resulting in a reduction of 642 kW and a reduction of 63.6% as a rate.

When this invention is verified, the total head (m) of the cold / hot water circulation secondary pump in the pseudo hermetic cold / hot water circulation system is the actual head 0 (m), the system loss head 10 m, and the secondary side of the low loss heat exchanger. The total value of pressure loss H _X2 3 (m) is 13 (m).

The total head (m) of the cold / hot water circulation primary pump in the pseudo hermetic cold / hot water circulation system is as follows: the actual head 0 (m), the system loss head 10 m, the secondary pressure loss H _X2 3 of the low loss heat exchanger ( The total value of m) is 13 (m).

The capacity of the secondary pump power for cold / hot water circulation in the quasi-enclosed cold / hot water circulation system is
"Equation 7"
P ₂ = ρ g Q (H _H2 + H _L0 ) / η (kW)
= 9.81 × 4.98 / 60 (m ³ /s)×(0+13)(m)/0.6
= 17.6 (kW) [Applicable pump power capacity] 18.5 (kW)

The capacity of the primary pump power for the cold / hot water circulation in the pseudo-sealed cold / hot water circulation system is
"Equation 8"
P ₁ = ρ g Q (H _H1 + H _L0 ) / η (kW)
= 9.81 x 8.1 / 60 (m ³ / s) x (0 + 13) (m) /0.6
= 28.6 (kW) [Applicable pump power capacity] 30 (kW)

The total capacity of the circulation pump power in the pseudo hermetic cold / hot water circulation system is 642 (kW) when combined with a low pressure loss heat exchanger (H _X1 3m, H _X2 3m). )

The annual power reduction amount is 642 (kW) x 24 hours x 365 days x 0.3 (operating rate) when combined with low pressure loss heat exchangers H _X1 3m and H _X2 3m
= 1,687,176 (kWh)

  The amount of power reduction is 642 (kW) × 0.7 (operation rate) = 449 (kW).

Electricity charge reduction amount (for high-voltage commercial power contracts)
1,687,176 (kWh / year) × 11 (yen / kWh) = about 18,558 (thousand yen / year)
Basic charge reduction (for high-voltage commercial power contracts)
449 (kW) x 12 months x 1,560 (yen / kWh) = about 8,405 (thousand yen / year)
Total reduction amount Approx. 26,963 (1,000 yen / year)

  The reduction of transport power, which operates throughout the year, like a cold / hot water circulation system for air conditioning in hospital facilities, etc., is the main feature of energy saving. This system is highly versatile, and the amount of greenhouse gas reduction is estimated to be approximately 1.89 million tons per year when converted to CO2 emissions on a nationwide scale (estimated using the current amount, approximately 60 billion yen per year) Reduction is expected.

The Example in the fluid conveyance system which uses seawater as cooling water in a power plant.
The total capacity of the transfer pump power in a normal fluid transfer system that uses seawater as cooling water in a power plant is as follows.

The total capacity of the normal fluid conveyance pump power that uses seawater as cooling water is
Two cooling water pumps per generator (Q = 39,300 m ³ / h 12 m 2,000 kW)
4,000kW
Number of generators installed 4 units Cooling water pump (2 units × 2,000 kW) × 4 units = 16,000 kW
H _H 6m H _L 6m (actual head 6m system loss head 6m foot valve 0m)

In a fluid conveyance system using seawater as cooling water in a power plant, the embodiment incorporating the low-loss fluid conveyance system of the present invention is as follows.
The total capacity of the transfer pump power is as follows.

The total capacity of the transfer pump power that uses seawater as cooling water is
Two cooling water pumps per generator (Q = 39,300 m ³ / h 6 m 1,000 kW)
2,000kW
Number of generators installed 4 units Cooling water pump (2 units × 1,000 kW) × 4 units = 8,000 kW
H _H 0m H _L 6m (actual head 0m system loss head 6m foot valve 0m)

The total capacity of the transfer pump power in the normal cooling water transfer system is 16,000 kW, and the total capacity of the cooling water pump power in the low loss fluid transfer system that maintains the same function is 8,000 kW. It becomes.
For this reason, the implementation of the present invention is 18,000 kW before the implementation, 8,000 kW after the implementation, and the effect is a reduction of 8,000 kW and a reduction of 50%.

When this invention is verified, the total head of the cooling water pump (m) in the low-loss fluid conveyance system
Is the total value 6 (m) of the actual head 0 (m) and the system loss head 6 m.
The capacity of the cooling water pump power in the low-loss fluid conveyance system is
"Equation 9"
Ps ₂ = ρ g Q (H _H + H _L ) / η (kW)
= 9.81 × 39,300 (m ³ / h) / ^3, 600 (sec / h)
× (0 + 6) (m) /0.6
= 1,070 (kW) [capacity of the corresponding pump power] 1,000 (kW)

The total capacity of the cooling water pump power in the low loss fluid conveyance system is 8,000.
(KW).

The annual power reduction amount is as follows when using a low-loss fluid conveyance system.
8,000 (kW) x 24 hours x 365 days x 0.7 (operation rate)
= 49, 056,000 (kWh)

Electricity charge reduction amount (for special high-voltage power contract)
49,056,000 (kWh) x 7 (yen / kWh) (approximate)
= About 343,392 (1,000 yen / year)
Basic charge reduction amount (for special high voltage power contract)
8,000 (kW) x 12 months x 1,500 (yen / kWh) (approximate)
= Approximately 144,000 (thousand yen / year)
Total reduction amount 487,392 (1,000 yen / year)

The reduction of transport power, which operates throughout the year, like a cooling water transport system in a power plant or the like, is an energy saving feature. This system is highly versatile, and the amount of greenhouse gas reduction is estimated to be several million tons per year when converted to carbon dioxide emissions on a nationwide scale (estimated by current amount conversion, several hundred billion yen per year) ) Reduction is expected.
Summary As described above, the problem of the present invention is that in an open-type cold / hot water circulation system using a heat storage tank in an air-conditioning heat source system, by setting all the actual heads to 0, a pseudo-sealed cold / cold temperature with low pressure loss. It is intended to save energy by configuring a water circulation system, reducing the total capacity of the circulation pump power.
Also, in the fluid transfer system for cooling water and liquid, by reducing the actual head, a low pressure loss fluid transfer system is constructed, and the total capacity of the fluid transfer pump power is reduced to save energy. It is.
Further, the solution of the present invention is to provide an open-type cold / hot water circulation system using a heat storage tank in an air-conditioning heat source system, in order to reduce the total capacity of the circulation pump power for the purpose of energy saving. By constructing a quasi-enclosed cold / hot water circulation system that eliminates the actual head, and constructing a low pressure loss cold / hot water circulation system with only a loss head, the total capacity of the circulation pump power has been reduced. This is a cold / hot water circulation system for energy-saving air conditioning.
In the quasi-enclosed cold / hot water circulation system, low temperature difference, primary side cold / hot water temperature difference 1 ° C or less, high efficiency, heat exchange rate 99.5% or more, and low pressure Loss, primary pressure loss H _X1 3m or less, secondary pressure loss H _X2 3m or less, combined with a low loss heat exchanger, more efficient, low pressure loss pseudo hermetic cold / hot water circulation system An energy-saving cold / hot water circulation system for air-conditioning that greatly reduces the total capacity of the circulation pump power can be configured.
In order to reduce the total capacity of the transfer pump power for the purpose of energy saving in the fluid transfer system for cooling water and liquid, etc., the actual pumping distance is maintained by maintaining the inside of the piping in the open system part in a vacuum. This is an energy-saving fluid transportation system that reduces the total capacity of the transportation pump power by constructing a low pressure loss fluid transportation system with reduced pressure and constructing a low pressure loss fluid transportation system with only head loss.
2 and 7 are reasonable if a representative drawing is selected.

Pseudo-enclosed cold / hot water circulation system diagram for air conditioning with dedicated heat storage equipment Pseudo-enclosed cold / hot water circulation system diagram for air conditioning with heat storage / heat source equipment Pseudo-sealed cold / hot water circulation system diagram for air conditioning, equipped with a vacuum pump when a dedicated heat storage device is installed Pseudo-sealed cold / hot water circulation system diagram for air conditioning, equipped with a vacuum pump in the case of a heat storage / heat source device Submersible valve installation diagram in a pseudo hermetic cold / hot water circulation system for air conditioning Open-type cold / hot water circulation system diagram using heat storage tank in air conditioning heat source system Low loss fluid transfer system diagram Low loss fluid transfer system with vacuum pump installed Normal fluid transfer system diagram

Explanation of symbols

1, 2, 3, 4 Valve P ₁ Cold / hot water primary pump (capacity) in hermetic cold / hot water circulation system
Hot and cold water secondary pump in the P ₂ sealed cold and hot water circulation system (volume)
H _L1 Primary head loss (m) in hermetic cold / hot water circulation system
H _L2 secondary head loss in hermetic cold / hot water circulation system (m)
Primary pressure loss of H _X1 heat exchanger (m)
Secondary pressure loss of H _X2 heat exchanger (m)
Cold / hot water secondary circulation pump (capacity) in P ₀ open-type cold / hot water circulation system
Actual head (m) of the secondary hot / cold water pump in the _H2 open chilled / hot water circulation system
Head loss (m) in H _L0 open type cold / hot water circulation system
SH1 Outbound primary header SH2 Outbound secondary header RH1 Returned water primary header RH2 Returned water secondary header Ps ₁ Transport pump (capacity) in a normal fluid transport system
Transfer pump (capacity) in Ps ₂ low loss fluid transfer system

Claims (11)

In an open-type cold / hot water circulation system that uses a heat storage tank in an air-conditioning heat source system, in order to reduce the total capacity of the circulation pump power, a pseudo-sealing in which the actual head is eliminated by maintaining a vacuum inside the piping of the open system part Energy saving energy by reducing the total capacity of the circulation pump power by constructing a low-pressure loss cold / hot water circulation system with a low head loss and a total head of the circulation pump of the open type cold / hot water circulation system. Cold / hot water circulation system for air conditioning. In an open-type cold / hot water circulation system that uses a heat storage tank in an air conditioning heat source system, an automatic air vent valve with a check valve is installed at the top of the open system part piping to maintain a vacuum inside the open system part pipe. An open-type cold / hot water circulation system by installing a leaked replenishment water pipe and making the equipment installed in the negative pressure section to be a device that does not cause air leakage and maintaining the inside of the piping of the open system part in a vacuum. Cooling / warm water circulation system for energy-saving air-conditioning that reduces the total capacity of the circulation pump power by configuring a low-pressure-loss cold / hot water circulation system with only the head of the loss for the entire head of the circulation pump. In an open type cold / hot water circulation system that uses a heat storage tank in an air-conditioning heat source system, in order to maintain a vacuum inside the piping of the open system part, a leak is provided with an automatic air vent valve with a check valve at the top position of the open system pipe Circulation of the open-type cold / hot water circulation system by installing a make-up water pipe and making the equipment installed in the negative pressure part to be a device that does not cause air leakage and maintaining the inside of the piping of the open system part in a vacuum. By constructing a low-pressure-loss chilled / hot water circulation system with only a head of loss, the pump's total head is continuously reduced depending on the system status in the chilled / hot water circulation system for energy-saving air conditioning, which reduces the total capacity of the circulation pump power. In case of generating leaking gas or springing gas, install a vacuum pump on the secondary side of the automatic air vent valve and arrange the open system part. So you can maintain a vacuum therein, and to allow suction by a vacuum pump, hot and cold water circulation system for energy saving air-conditioning. In an open type cold / hot water circulation system that uses a heat storage tank in an air-conditioning heat source system, in order to maintain a vacuum inside the piping of the open system part, a leak is provided with an automatic air vent valve with a check valve at the top position of the open system pipe By installing a make-up water pipe and making the equipment installed in the negative pressure part a device that does not cause air leakage and maintaining a vacuum state, the total head of the circulation pump of the open-type cold / hot water circulation system can be Among the cold / hot water circulation systems for energy-saving air conditioning, which has reduced the total capacity of the circulation pump power by configuring a low pressure loss cold / hot water circulation system with only head loss, in a system that uses heat source equipment for both heat storage and chasing operation, A switch valve is installed to prevent the cold / hot water inside the system from falling. In addition, the sealed gate valve provided to maintain the inside of the piping of the open system part in vacuum is a general gate valve, and the gate valve is installed in the water of the cold / hot water tank so as not to cause air leakage. The start / stop schedule setting unit is installed so that the cold / hot water primary pump and the cold / hot water secondary pump of the heat exchanger are driven by the same motor, and the start / stop of the motor can be performed in the time zone specified in the schedule. In addition, in order to adopt a variable flow rate system based on the return temperature of the chilled / hot water circulation system, an inverter speed control device is provided so that the chilled / hot water circulation flow rate control can be performed within the setting range of the maximum value flow rate and the minimum value flow rate. The primary and secondary chilled / hot water circulation flow rate of the system can be controlled by one set of circulation pump set. The temperature difference between the primary water and the secondary water in the heat exchanger is 1 ° C. or less, the heat exchange rate is 99.5% or more, and By combining a low-loss heat exchanger with a primary pressure loss of 3 m or less and a secondary pressure loss of 3 m or less, the actual head of the entire cold / warm water circulation system is eliminated more efficiently, and a lower loss head A cold / hot water circulation system for energy-saving air conditioning that reduces the total capacity of the cold / hot water circulation pump power by building a cold / hot water circulation system. In order to reduce the total capacity of the pump power in the fluid transfer system such as cooling water and liquid, a fluid transfer system that eliminates the actual head is constructed by maintaining the inside of the pipe in the open system in a vacuum. A low-loss fluid conveyance system that reduces the total capacity of pump power by constructing a low-pressure-loss fluid conveyance system with a total head and a loss head only. In a fluid transfer system for cooling water and liquids, a leak replenishment water pipe with an automatic air vent valve with a check valve is installed at the top of the open system pipe to maintain a vacuum inside the open system pipe. In addition, the equipment installed in the negative pressure section is a device with little air leakage, and the inside of the piping of the open system part can be maintained in a vacuum, so that the total head of the pump of the fluid conveyance system can be A low-loss fluid transfer system that reduces the total capacity of pump power by configuring a low-pressure-loss system. In order to maintain a vacuum inside the open system pipe in a fluid transfer system such as cooling water or liquid, a leak replenishment water pipe with an automatic air vent valve with a check valve is installed at the top position of the open system pipe. Furthermore, by making the equipment installed in the negative pressure part a device with less air leakage and maintaining the inside of the piping of the open system part in a vacuum, the total head of the pump of the fluid conveyance system can be reduced only to the loss head. In a low-loss fluid conveyance system that reduces the total capacity of pump power by configuring a low-pressure loss system, an automatic air vent valve can be used to continuously generate leaked gas or spring gas depending on the system status. A vacuum pump was installed on the secondary side of the system, so that the inside of the piping of the open system part could be kept in vacuum so that it could be sucked by the vacuum pump. Low loss fluid transfer system. In order to maintain a vacuum inside the open system pipe in a fluid transfer system such as cooling water or liquid, a leak replenishment water pipe with an automatic air vent valve with a check valve is installed at the top position of the open system pipe. Furthermore, by making the equipment installed in the negative pressure part a device with little air leakage and maintaining the vacuum state, the entire head of the pump of the fluid transportation system can be transported with low pressure loss fluid with only head loss. Among the low-loss fluid conveyance systems that reduce the total pump power by configuring the system, a system with an initial adjustment valve installed to prevent fluids such as cooling water and liquid from falling. In the fluid transfer system such as cooling water and liquid, in order to adopt a variable flow rate method by temperature and flow rate, a rotation speed control device by an inverter is provided so that flow rate control can be performed within the setting range of maximum value flow rate and minimum value flow rate, A low-loss fluid conveyance system that can control the flow rate by reducing the conveyance power by suppressing the increase in flow rate by configuring a low pressure loss system with only the head of the loss for the entire head of the pump.

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