CN108592185B - Operation method of building cooling and heating system - Google Patents

Operation method of building cooling and heating system Download PDF

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Publication number
CN108592185B
CN108592185B CN201810323790.5A CN201810323790A CN108592185B CN 108592185 B CN108592185 B CN 108592185B CN 201810323790 A CN201810323790 A CN 201810323790A CN 108592185 B CN108592185 B CN 108592185B
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air
conditioning
water
control device
electric control
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CN108592185A (en
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贾立术
张天宇
许明远
甘鹏飞
卢争艳
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Henan College of Industry and Information Technology
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Henan College of Industry and Information Technology
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/00077—Indoor units, e.g. fan coil units receiving heat exchange fluid entering and leaving the unit as a liquid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0059—Indoor units, e.g. fan coil units characterised by heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/89—Arrangement or mounting of control or safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F7/00—Ventilation
    • F24F7/007—Ventilation with forced flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F7/00—Ventilation
    • F24F2007/004—Natural ventilation using convection

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Thermal Sciences (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses an operation method of a building cooling and heating system, which comprises a cooling operation method and a heating operation method; the first step of the cooling operation method is to adjust the operation state; the second step is that the worker starts the frequency conversion compressor, the first air-conditioning water pump and the fresh air fan through the main electric control device, the third step is that the frequency conversion control is continuously carried out in summer, and the main electric control device carries out air pressure regulation and fresh air energy-saving regulation; the heat supply operation method comprises the following steps: the first step is to adjust the running state; the second step is that the worker starts the frequency conversion compressor, the first air-conditioning water pump and the fresh air fan through the main electric control device, and the third step is that the frequency conversion control in winter is continuously carried out; meanwhile, the main electric control device is used for adjusting air pressure and adjusting fresh air energy conservation. The invention has simple and convenient steps and flexible control, is convenient for switching between a cooling operation method and a heating operation method, adopts various technical means to reduce energy consumption, can respectively adjust each air-conditioning room, and has very stable system operation.

Description

Operation method of building cooling and heating system
Technical Field
The invention relates to the technical field of building and automation, in particular to a gas-drawing heat-exchange central air conditioner.
Background
In 2003, severe SARS virus infection occurred in the large gardens of the Row of hong Kong, and 400 people infected SARS virus and 40 people died. After investigation, the defects of the ventilation design of the air conditioner of the building are found to be one of the reasons for the high infection rate. The air intake and the air exhaust of different households are mutually interfered, and the condition of cross propagation of viruses is provided. Therefore, the air conditions inside the building are not only related to the comfort level of people's life, but also to people's health.
Building air conditioning systems have taken the burden of providing good air conditions within the building. The existing building air conditioning system has high energy consumption and cannot realize fine adjustment. If fresh air is supplied, some central air-conditioning systems uniformly and synchronously supply fresh air to all air-conditioning rooms, and the fresh air is introduced into the rooms which are not occupied or used by people, so that the energy waste is caused.
In the conventional fan coil for the central air conditioner, after the indoor temperature reaches a set value, at most, only the fan of the fan coil can be stopped, and a medium (such as water) carrying cold or heat in the fan coil cannot be stopped, so that useless energy consumption is generated. In summer, because the fan of the fan coil stops running, the indoor air temperature at the fan coil is greatly reduced, and the condensation phenomenon at the fan coil can be generated.
At present, world resources are increasingly deficient, the low-carbon and environment-friendly concept is increasingly deep, and a central air conditioner with lower energy consumption needs to be designed by utilizing various natural conditions.
Disclosure of Invention
The invention aims to provide an operation method of a building cooling and heating system, which reduces energy consumption through air extraction and ventilation and can respectively adjust air-conditioning rooms.
The operation method of the building cooling and heating system is carried out by the central air conditioner for air drawing and heat exchange; the air-drawing heat exchange central air conditioner comprises a heat pump system, a fresh air main pipe, an air conditioner water pipeline, a water return pipeline and a plurality of air conditioner rooms, wherein each air conditioner room is provided with a fan coil respectively, and the fan coil of each air conditioner room is connected with an air conditioner water inlet pipe and a water return branch pipe respectively; a fan coil electric control device and a fan coil temperature sensor for sensing indoor temperature are arranged in the fan coil, a display screen is arranged on the fan coil, the fan coil is provided with a circulating air inlet and a circulating air outlet, and a remote controller is matched with the fan coil electric control device;
indoor pressure sensors are arranged in all air-conditioning rooms, and outdoor pressure sensors are arranged outside a building where the air-drawing heat-exchange central air conditioner is located;
the heat pump system comprises a variable frequency compressor, an evaporator, a throttling device and a condenser which are circularly communicated through a refrigerant pipeline; the air-conditioning water pipeline comprises a first air-conditioning water pipeline and a second air-conditioning water pipeline; the water return pipeline comprises a first water return pipeline and a second water return pipeline;
a first heat exchange box is arranged on the periphery of the evaporator, two opposite ends of the first heat exchange box are respectively communicated with the first water return pipeline and the first air-conditioning water pipeline, and two opposite ends of the second heat exchange box are respectively communicated with the second water return pipeline and the second air-conditioning water pipeline;
the first air-conditioning water pipeline and the second air-conditioning water pipeline are both communicated with an air-conditioning circulating water main pipe; the fresh air main pipe is provided with a fresh air fan, each air conditioner water inlet pipe is respectively communicated with the air conditioner circulating water main pipe through an air conditioner branch pipe, and each air conditioner room is respectively communicated with the fresh air main pipe through a fresh air branch pipe; air valves for closing or opening the fresh air branch pipes are arranged in each air-conditioning room;
the first heat exchange box is communicated with a first air pulling air inlet pipe and a first air pulling air outlet pipe, the first air pulling air outlet pipe is connected to the top of the first heat exchange box, the first air pulling air inlet pipe is connected to the bottom of the first heat exchange box and provided with a first air inlet electromagnetic valve, and the tail end of the first air pulling air inlet pipe is provided with an opening; the first air extracting and outlet pipe extends upwards for more than 3 meters, and the top end of the first air extracting and outlet pipe is provided with an opening;
the second heat exchange box is communicated with a second air pulling air inlet pipe and a second air pulling air outlet pipe, the second air pulling air outlet pipe is connected to the top of the second heat exchange box, the second air pulling air inlet pipe is connected to the bottom of the second heat exchange box and provided with a second air inlet electromagnetic valve, and the tail end of the second air pulling air inlet pipe is provided with an opening; the second air extracting and discharging pipe extends upwards for more than 3 meters and is provided with an opening at the top end;
the first air-drawing air-out pipe is provided with a first air-drawing electromagnetic valve, and the second air-drawing air-out pipe is provided with a second air-drawing electromagnetic valve;
the first water return pipeline and the second water return pipeline are communicated with a water return main pipe; a first water return pump is arranged on the first water return pipeline, and a second water return pump is arranged on the second water return pipeline;
a backwater main pipe temperature sensor and a backwater main pipe pressure sensor are arranged in the backwater main pipe, and a backwater branch pipe temperature sensor and a backwater branch pipe pressure sensor are respectively arranged in each backwater branch pipe;
a fresh air temperature sensor and a fresh air pressure sensor are arranged in the fresh air main pipe; an air conditioner temperature sensor and an air conditioner pressure sensor are arranged in the air conditioner circulating water main pipe;
the middle part of the water return main pipe is provided with a water return tee joint, the water return tee joint is connected to the water return main pipe in series through two interfaces of the water return tee joint, and the other interface of the water return tee joint is connected with each water return branch pipe; a first switching electromagnetic valve and a second switching electromagnetic valve are respectively arranged on the water return main pipes on two sides of the water return tee;
air conditioner water inlet electromagnetic valves are respectively arranged on the air conditioner branch pipes, fresh air electromagnetic valves are arranged on the fresh air branch pipes, a first air conditioner water pump and a first air conditioner electromagnetic valve are arranged on the first air conditioner water pipeline, and a second air conditioner water pump and a second air conditioner electromagnetic valve are arranged on the second air conditioner water pipeline;
the fan coil electric control device is connected with the main electric control device through a line;
the main electric control device is connected with the return water main pipe temperature sensor, the return water main pipe pressure sensor, the return water branch pipe temperature sensor, the return water branch pipe pressure sensor, the fresh air temperature sensor, the fresh air pressure sensor, the air conditioner temperature sensor, the air conditioner pressure sensor, the indoor pressure sensor, the outdoor pressure sensor, the fresh air fan, the first return water pump, the second return water pump, the first air conditioner water pump, the second air conditioner water pump, the first air inlet electromagnetic valve, the second air inlet electromagnetic valve, the first switching electromagnetic valve, the second switching electromagnetic valve, the air conditioner water inlet electromagnetic valve, the fresh air electromagnetic valve, the first air exhaust electromagnetic valve, the second air exhaust electromagnetic valve, the first air conditioner electromagnetic valve, the second air conditioner electromagnetic valve, each air valve and the variable frequency compressor;
the first water return pump, the second water return pump, the first air-conditioning water pump, the second air-conditioning water pump and the fresh air fan are all variable frequency motors; the frequency conversion interval is arranged between the highest frequency and the lowest frequency of each variable frequency motor, and the average value of the highest frequency and the lowest frequency of each variable frequency motor is the intermediate frequency of the corresponding variable frequency motor; the difference value between the highest frequency and the lowest frequency of each variable frequency motor is the variable frequency amplitude of the motor; the frequency regulation amplitude of each frequency conversion action is one twentieth of the frequency conversion amplitude of the motor;
the total electric control device stores a target pressure difference between indoor air pressure and outdoor air pressure, the target pressure difference is 0.01MPa, and the indoor air pressure is higher than the outdoor air pressure; the main electric control device stores target pressure difference between the air pressure in the fresh air main pipe and the outdoor air pressure, the target pressure difference is 0.02-0.05 MPa, and the air pressure in the fresh air main pipe is higher than the outdoor air pressure;
before the operation method of the building cooling and heating system is started in summer or winter, all the electromagnetic valves are in a closed state; the frequency conversion interval is arranged between the highest frequency and the lowest frequency of the frequency conversion compressor, and the average value of the highest frequency and the lowest frequency is the intermediate frequency; the difference value between the highest frequency and the lowest frequency is the variable frequency amplitude of the compressor; the frequency regulation amplitude of each frequency conversion action is one twentieth of the frequency conversion amplitude of the compressor;
the operation method comprises a cooling operation method and a heating operation method; in the processes of the cooling operation method and the heating operation method, users of all air-conditioning rooms independently open or close the air valves;
the cooling operation method comprises the following steps:
the first step is to adjust the running state; the working personnel adjust the system running state to be a summer running state through the main electric control device; the summer operation state is as follows: the first air inlet electromagnetic valve is normally closed, so that return water is prevented from flowing out through the first air inlet electromagnetic valve, and the second air inlet electromagnetic valve and the second air drawing electromagnetic valve are both opened, so that ambient air is allowed to enter the second heat exchange box to realize air drawing and heat dissipation; the first forced ventilation electromagnetic valve is normally closed, and the second forced ventilation electromagnetic valve is normally open; the first switching electromagnetic valve is normally open so that the return water enters the first heat exchange box and exchanges heat with the evaporator, and the second switching electromagnetic valve is normally closed so that the return water is prevented from entering the second heat exchange box; the first air-conditioning electromagnetic valve is opened, and the second air-conditioning electromagnetic valve is closed, so that the air-conditioning circulating water is cooled by the evaporator and isolated from the condenser; the target temperature in the circulating water main pipe of the air conditioner in summer is 10 ℃;
the second step is a starting step, wherein a worker starts the variable frequency compressor, the first air-conditioning water pump and the fresh air fan through the main electric control device, so that the variable frequency compressor works in the highest frequency state, the temperature of the evaporator is rapidly reduced, and the temperature of the condenser is rapidly increased;
the main electric control device monitors the water temperature and the water pressure in the air-conditioning circulating water main pipe through an air-conditioning temperature sensor and an air-conditioning pressure sensor; when the water temperature in the air-conditioning circulating water main pipe is reduced to 10 ℃, carrying out normal summer variable frequency control on the variable frequency compressor; the frequency conversion control in summer is as follows: when the temperature of water in the air-conditioning circulating water main pipe is more than or equal to 11 ℃, the main electric control device controls the variable frequency compressor to work at the highest frequency; when the temperature of water in the air-conditioning circulating water main pipe is lower than 9 ℃, the main electric control device controls the variable-frequency compressor to stop; when the water temperature in the air-conditioning circulating water main pipe is equal to 9 ℃, the main electric control device controls the variable frequency compressor to work at the lowest frequency; when the water temperature in the air-conditioning circulating water main pipe is equal to 10 ℃, the main electric control device controls the variable-frequency compressor to work at the intermediate frequency; when the water temperature in the air-conditioning circulating water main pipe is higher than 9 ℃ and lower than 11 ℃, the main electric control device controls the frequency conversion compressor to perform frequency conversion action of frequency increase once when the water temperature in the air-conditioning circulating water main pipe rises by 0.1 ℃ until the frequency conversion compressor works at the highest frequency; when the water temperature in the air-conditioning circulating water main pipe is reduced by 0.1 ℃, the main electric control device controls the variable frequency compressor to perform frequency conversion action with reduced frequency once until the variable frequency compressor works at the lowest frequency;
the third step is to continuously carry out frequency conversion control in summer, and simultaneously carry out air pressure regulation and fresh air energy-saving regulation by the main electric control device;
the air pressure adjusting method comprises the following steps: the main electric control device continuously monitors fresh air temperature, fresh air pressure, outdoor air pressure and indoor air pressure through a fresh air temperature sensor, a fresh air pressure sensor, an indoor pressure sensor and an outdoor pressure sensor; when an air valve of an air-conditioning room is closed, stopping monitoring the indoor air pressure of the air-conditioning room; when an air valve of an air-conditioning room is opened, restoring and monitoring the indoor air pressure of the air-conditioning room;
when the pressure difference between the air pressure in the fresh air main pipe and the outdoor air pressure is a target pressure difference, the fresh air fan works at the middle frequency; when the pressure difference between the air pressure in the fresh air main pipe and the outdoor air pressure rises from a target pressure difference, the total electric control device controls the fresh air fan to perform frequency conversion action of once frequency reduction for reducing the pressure difference until the fresh air fan works at the lowest frequency when the pressure difference rises by 0.001 MPa; when the pressure difference between the fresh air main pipe and the outdoor air pressure is reduced by a target pressure difference, the total electric control device controls the fresh air fan to perform frequency conversion action of increasing frequency once for increasing the pressure difference until the fresh air fan works at the highest frequency when the pressure difference between the fresh air main pipe and the outdoor air pressure is reduced by 0.001 MPa;
when the pressure difference between the indoor air pressure and the outdoor air pressure of the air-conditioning room is a target pressure difference, the main electric control device controls the corresponding fresh air electromagnetic valve to be in a half-open state, and when the pressure difference between the indoor air pressure and the outdoor air pressure is lower than 0.005MPa, the main electric control device controls the corresponding fresh air electromagnetic valve to be in a full-open state;
the fresh air energy-saving adjusting method comprises the following steps: when an air valve of one air-conditioning room is closed, fresh air energy-saving regulation is not carried out on the air-conditioning room;
for each air-conditioning room with the air valve opened, the main electric control device continuously monitors the fresh air temperature, the opening and closing state of the fan coil electric control device of each air-conditioning room and the air-conditioning temperature set by a user of the air-conditioning room for the fan coil electric control device in the opening state through a fresh air temperature sensor and the fan coil electric control device of each air-conditioning room; when the fresh air temperature is less than or equal to the air-conditioning temperature set by a user of one air-conditioning room for the fan coil electric control device, closing the air-conditioning water inlet electromagnetic valve corresponding to the air-conditioning room, and adjusting the opening degree of the fresh air electromagnetic valve corresponding to the air-conditioning room to be in a full-open state; when the fresh air temperature is higher than the air conditioner temperature set by a user of one air conditioner room for the fan coil electric control device, opening an air conditioner water inlet electromagnetic valve, and adjusting the working frequency of a fresh air fan and the state of the fresh air electromagnetic valve according to an air pressure adjusting method;
the heat supply operation method comprises the following steps:
the first step is to adjust the running state; the working personnel adjust the system running state to be a winter running state through the main electric control device; the winter running state is as follows: the second air inlet electromagnetic valve is normally closed, so that return water is prevented from flowing out through the second air inlet electromagnetic valve, and the first air inlet electromagnetic valve and the first air drawing electromagnetic valve are both opened, so that ambient air is allowed to enter the first heat exchange box to realize air drawing and heat dissipation; the second forced ventilation electromagnetic valve is normally closed, and the first forced ventilation electromagnetic valve is normally open; the second switching electromagnetic valve is normally open so that the return water enters the second heat exchange box and exchanges heat with the condenser, and the first switching electromagnetic valve is normally closed so that the return water is prevented from entering the first heat exchange box; the second air-conditioning electromagnetic valve is opened, and the first air-conditioning electromagnetic valve is closed, so that the air-conditioning circulating water passes through the condenser to be heated and is isolated from the evaporator; the target temperature in the air-conditioning circulating water main pipe in winter is 55 ℃;
the second step is a starting step, wherein a worker starts the variable frequency compressor, the second air-conditioning water pump and the fresh air fan through the main electric control device, and the variable frequency compressor works in the highest frequency state, so that the temperature of the evaporator is rapidly reduced, and the temperature of the condenser is rapidly increased;
the main electric control device monitors the water temperature and the water pressure in the air-conditioning circulating water main pipe through an air-conditioning temperature sensor and an air-conditioning pressure sensor; when the temperature of water in the air-conditioning circulating water main pipe rises to 55 ℃, carrying out normal winter variable frequency control on the variable frequency compressor; the winter variable frequency control is as follows: when the temperature of water in the air-conditioning circulating water main pipe is lower than or equal to 53 ℃, the main electric control device controls the variable frequency compressor to work at the highest frequency; when the water temperature in the air-conditioning circulating water main pipe is more than 57 ℃, the main electric control device controls the variable-frequency compressor to stop; when the water temperature in the air-conditioning circulating water main pipe is equal to 57 ℃, the electric control device controls the variable-frequency compressor to work at the lowest frequency; when the water temperature in the air-conditioning circulating water main pipe is equal to 55 ℃, the main electric control device controls the variable-frequency compressor to work at the intermediate frequency; when the water temperature in the air-conditioning circulating water main is higher than 53 ℃ and lower than 57 ℃, the main electric control device controls the frequency conversion compressor to perform frequency conversion action of once frequency reduction when the water temperature in the air-conditioning circulating water main rises to 0.2 ℃ until the frequency conversion compressor works at the lowest frequency; when the water temperature in the air conditioner circulating water main pipe is reduced by 0.2 ℃, the main electric control device controls the variable frequency compressor to perform frequency conversion action of frequency increase for one time until the variable frequency compressor works at the highest frequency;
the third step is to continuously carry out winter frequency conversion control; when the winter frequency conversion control is continuously carried out, the main electric control device carries out air pressure regulation and fresh air energy-saving regulation;
firstly, the method for regulating the air pressure in winter is the same as the method for regulating the air pressure in summer;
the fresh air energy-saving adjusting method comprises the following steps: when an air valve of one air-conditioning room is closed, fresh air energy-saving regulation is not carried out on the air-conditioning room;
for each air-conditioning room with the air valve opened, the main electric control device continuously monitors the fresh air temperature, the opening and closing state of the fan coil electric control device of each air-conditioning room and the air-conditioning temperature set by a user of the air-conditioning room for the fan coil electric control device in the opening state through a fresh air temperature sensor and the fan coil electric control device of each air-conditioning room; when the fresh air temperature reaches or exceeds the air-conditioning temperature set by a user of one air-conditioning room on the fan coil electric control device, closing the air-conditioning water inlet electromagnetic valve corresponding to the air-conditioning room, and adjusting the opening degree of the fresh air electromagnetic valve corresponding to the air-conditioning room to be in a full-open state; when the fresh air temperature is lower than the air-conditioning temperature set by a user of an air-conditioning room to the fan coil electric control device by 1 ℃, the air-conditioning water inlet electromagnetic valve is opened, and the working frequency of the fresh air fan and the state of the fresh air electromagnetic valve are adjusted according to the air pressure adjusting method.
The top of one end of the first heat exchange box, which is communicated with the first water return pipeline, is also communicated with a first forced heat exchange air pipe, the first forced heat exchange air pipe and the first air pulling and air outlet pipe are arranged side by side, and the upper end of the first forced heat exchange air pipe is communicated with the first air pulling and air outlet pipe above the first air pulling electromagnetic valve; the first forced heat exchange air pipe is provided with a first forced heat exchange fan and a first forced ventilation electromagnetic valve; the first forced ventilation electromagnetic valve is positioned below the first forced heat exchange fan;
the top of one end of the second heat exchange box, which is communicated with the second water return pipeline, is also communicated with a second forced heat exchange air pipe, the second forced heat exchange air pipe and a second air drawing and air outlet pipe are arranged side by side, and the upper end of the second forced heat exchange air pipe is communicated with the second air drawing and air outlet pipe above the second air drawing electromagnetic valve; a second forced heat exchange fan and a second forced ventilation electromagnetic valve are arranged on the second forced heat exchange air pipe; the second forced ventilation electromagnetic valve is positioned below the second forced heat exchange fan; the second forced heat exchange fan, the first forced ventilation electromagnetic valve and the second forced ventilation electromagnetic valve are respectively connected with the main electric control device;
an evaporation temperature sensor is arranged at the evaporator, a condensation temperature sensor is arranged at the condenser, and the evaporation temperature sensor and the condensation temperature sensor are respectively connected with a main electric control device;
the main electric control device stores normal working parameters of the heat pump system, including the working temperature range of the evaporator and the working temperature range of the condenser; the main electric control device continuously monitors the actual temperature at the evaporator and the condenser through an evaporation temperature sensor and a condensation temperature sensor;
in summer, when the temperature of the condenser is higher than the working temperature range of the condenser, the main electric control device opens the second forced heat exchange fan to increase the ventilation heat exchange amount of the condenser, so that the temperature of the condenser is reduced; after the temperature of the condenser falls back into the working temperature range of the condenser, delaying for 4-10 minutes and closing the second forced heat exchange fan;
in winter, when the temperature of the evaporator is lower than the working temperature range of the evaporator, the main electric control device opens the first forced heat exchange fan to increase the ventilation and heat exchange quantity of the evaporator, so that the temperature of the evaporator is increased; and after the temperature of the evaporator is increased back to the working temperature range of the evaporator, delaying for 4-10 minutes and closing the first forced heat exchange fan.
In the third step of the cooling operation method, when the summer variable frequency control is continuously carried out, the total electric control device respectively carries out summer constant temperature regulation on each air-conditioning room;
the summer constant temperature regulation is that the main electric control device reads the actual temperature in the air-conditioning room and the air-conditioning temperature set by a user through the fan coil electric control device, and when the actual temperature in the air-conditioning room is equal to the air-conditioning temperature set by the user, the main electric control device controls the corresponding air-conditioning water inlet electromagnetic valve to be in a half-open state; when the actual temperature in the air-conditioning room is more than or equal to the air-conditioning temperature set by the user and is 1 ℃, the main electric control device controls the corresponding air-conditioning water inlet electromagnetic valve to be in a full-open state; when the actual temperature in the air-conditioning room is less than or equal to the air-conditioning temperature set by the user by 1 ℃, the main electric control device controls the corresponding air-conditioning water inlet electromagnetic valve to be closed;
when the electric control device of the fan coil is closed, the main electric control device controls the closing of the corresponding air conditioner water inlet electromagnetic valve;
in the third step of the heat supply operation method, when the winter variable frequency control is continuously carried out, the main electric control device respectively carries out winter constant temperature adjustment on each air-conditioning room;
in winter constant temperature regulation, a main electric control device reads the actual temperature in an air-conditioning room and the air-conditioning temperature set by a user through a fan coil electric control device, and when the actual temperature in the air-conditioning room is equal to the air-conditioning temperature set by the user, the main electric control device controls a corresponding air-conditioning water inlet electromagnetic valve to be in a half-open state; when the actual temperature in the air-conditioning room is less than or equal to the air-conditioning temperature set by the user and is 1.5 ℃, the main electric control device controls the corresponding air-conditioning water inlet electromagnetic valve to be in a full-open state; when the actual temperature in the air-conditioning room is more than or equal to the air-conditioning temperature set by the user and is 1.5 ℃, the main electric control device controls the corresponding air-conditioning water inlet electromagnetic valve to be closed; when the electric control device of the fan coil is closed, the main electric control device controls the closing of the corresponding air conditioner water inlet electromagnetic valve.
The main electric control device is connected with a display, and continuously monitors the temperature in each return water branch pipe through a return water branch pipe pressure sensor; the main electric control device calculates the pressure difference between each water return branch pipe and the water return main pipe and calculates the average value of the pressure difference between each water return branch pipe and the water return main pipe;
when the pressure difference between one water return branch pipe and the water return main pipe is more than or equal to two times of the average value of the pressure difference, the water return branch pipe is indicated to be damaged, and the main electric control device displays alarm information on a display to prompt a worker to maintain.
A first water return electromagnetic valve is arranged on a first water return pipeline at the outlet of the first water return pump, and a second water return electromagnetic valve is arranged on a second water return pipeline at the outlet of the second water return pump; the first water return electromagnetic valve and the second water return electromagnetic valve are respectively connected with the main electric control device;
in the first step of the cooling operation method, the main electric control device opens the first water return electromagnetic valve and closes the second water return electromagnetic valve to prevent the return water from entering the second heat exchange box.
In the first step of the heat supply operation method, the main electric control device opens the second water return electromagnetic valve and closes the first water return electromagnetic valve to prevent the return water from entering the first heat exchange box.
The throttling device is a throttling valve or a capillary tube, and the total electric control device is a single chip microcomputer.
The invention has the following advantages:
the invention can carry out natural gas-drawing ventilation heat exchange on the evaporator or the condenser by utilizing the gas-drawing pipeline, thereby saving electric energy. When the system load is large and the natural gas-drawing ventilation heat exchange is not enough to meet the requirement, the forced ventilation heat exchange can be carried out through the first or second forced heat exchange fan, so that the defect of the natural gas-drawing ventilation heat exchange is overcome. Specifically, the main energy consuming component of the heat pump system is the compressor, and the power of the compressor of the central air conditioner is the largest among the power of all the components of the air conditioning system. The setting of first forced heat transfer fan and second forced heat transfer fan can be great at system load, when natural draft ventilation heat transfer volume is not enough (summer performance is condenser high temperature, winter performance is evaporimeter low temperature), through opening first forced heat transfer fan (winter) or second forced heat transfer fan (summer), increase evaporimeter (winter) or condenser (summer) and ambient air's heat transfer volume through forced draft, thereby reduce the pressure differential between evaporimeter and the condenser, and then reduce inverter compressor's power. The operation power of the forced heat exchange fan is far less than the power of the compressor reduced due to the reduction of the pressure difference, so that the arrangement can play a significant role in reducing the energy consumption of the system when the system load is large and the ventilation quantity of the air-pulling heat exchange is insufficient, and the energy-saving effect is very significant when the outdoor temperature exceeds 36 ℃ in summer or is lower than-10 ℃ in winter.
The invention has simple structure and is convenient to switch between a cooling operation method and a heating operation method. In spring and autumn, the fresh air fan can be used for continuously providing fresh air for each air-conditioning room in the building.
The electric control device of the fan coil is connected with the main electric control device through a circuit, so that the main electric control device can compare the set temperature of a certain air-conditioning room with the air supply temperature of the air conditioner sensed by the air-conditioning temperature sensor, thereby controlling the opening degree of an air-conditioning water inlet electromagnetic valve on an air-conditioning water inlet pipe of the corresponding air-conditioning room or closing the air-conditioning water inlet electromagnetic valve, adjusting the air supply quantity of the system according to the actual load, keeping the maximum air supply quantity at any time and reducing the energy consumption of the system.
The air valves used for closing or opening the fresh air branch pipes are arranged in each air-conditioning room, and users in each air-conditioning room independently open or close the air valves, so that the control mode provides more flexibility, and the users in the air-conditioning rooms can quickly reach the set air-conditioning temperature by closing the fresh air.
The air conditioner pressure sensor is arranged, so that a worker can monitor and maintain the air pressure in the air conditioner circulating water main pipe through the main electric control device conveniently.
Be equipped with in each air-conditioning room and be used for closing or opening the blast gate of new trend branch pipe, the user can independently close the new trend branch pipe, avoids still sending the new trend to unmanned air-conditioning room, causes the waste of new trend fan energy.
The hood can prevent rainwater or sundries from falling into the first or second air-pulling air-out pipe along the top opening of the first or second air-pulling air-out pipe, so that the air path is ensured to be smooth, and water accumulation in the first and second heat exchange boxes is prevented.
The structure of the invention allows the frequency of the variable frequency compressor to be finely controlled according to the actual working condition, when the maximum power of the variable frequency compressor can meet the system requirement, the water temperature in the air-conditioning circulating water main pipe fluctuates within the range of 10 +/-1 ℃, the fluctuation of the water temperature is small, the frequency change of the variable frequency compressor is smooth, and the energy consumption increase caused by large-amplitude frequency modulation is avoided; operating at the highest frequency when the water temperature is high helps to quickly reach the target temperature.
The invention can prevent the indoor air pressure from being too low, ensure the indoor micro-positive pressure state, and simultaneously avoid the frequent operation of the fresh air electromagnetic valve.
The arrangement of the air conditioner backwater electromagnetic valve and the like is convenient for maintaining the system.
The fresh air energy-saving adjusting method can stop supplying air-conditioning circulating water to a single or certain air-conditioning rooms when the temperature requirements of users of the air-conditioning rooms or certain air-conditioning rooms can be met by fresh air, and the requirements of the air-conditioning rooms are met by the fresh air, so that the aim of saving energy is fulfilled. The energy-saving effect of the fresh air energy-saving adjusting method is particularly remarkable at the beginning and near ending of the air conditioning season.
The indoor and outdoor temperature difference in winter is greater than the indoor and outdoor temperature difference in summer, people are lower than summer in winter in the sensitivity degree of air temperature change, and the indoor air temperature fluctuation in winter is properly greater than the summer air temperature fluctuation, so that the experience of people is not influenced, and the energy consumption is reduced.
The ordinary fan coil device also has a temperature adjusting function, and constant temperature control is realized by adjusting the power of the fan. The invention can carry out double constant temperature control through the main electric control device and the air conditioner water inlet electromagnetic valve, can ensure constant temperature effect when the fan coil is out of control, and has better constant temperature effect. In a conventional fan coil for a central air conditioner, after an indoor temperature reaches a set value, only a fan of the fan coil can be stopped at most, and a medium (such as water) carrying cold or heat passing through the fan coil cannot be stopped. In summer, because the fan of the fan coil stops running, the indoor air temperature at the fan coil is greatly reduced, and the condensation phenomenon at the fan coil can be generated. The invention can directly stop the medium carrying cold or heat from being led into the fan coil, thereby not only preventing the fan coil from continuously supplying cold (summer) or heat (winter) when the air conditioner is not needed, thereby saving energy, but also avoiding the condensation phenomenon at the fan coil when the fan coil is closed in summer.
The delayed closing can prevent the forced heat exchange fan from being frequently started and closed.
Drawings
FIG. 1 is a schematic diagram of the control principle of the present invention;
fig. 2 is a schematic view of the structure at the first heat exchange tank;
fig. 3 is a schematic view of the structure at the second heat exchange tank;
fig. 4 is a schematic view of the system of the present invention with the first and second air extraction outlet pipes removed.
Detailed Description
The direction of the arrows in fig. 4 is the direction of flow of the fluid there.
The invention discloses an operation method of a building cooling and heating system, as shown in figures 1 to 4, the air-drawing heat exchange central air conditioner comprises a heat pump system, a fresh air main pipe 1, an air conditioner water pipeline, a water return pipeline and a plurality of air conditioner rooms 2, wherein each air conditioner room 2 is respectively provided with a fan coil, and the fan coil of each air conditioner room 2 is respectively connected with an air conditioner water inlet pipe 3 and a water return branch pipe 4; a fan coil electric control device 5 and a fan coil temperature sensor for sensing indoor temperature are arranged in the fan coil, a display screen is arranged on the fan coil, the fan coil is provided with a circulating air inlet and a circulating air outlet, and a remote controller is matched with the fan coil electric control device 5; the fan coil and its remote controller are conventional devices, and the specific structure of the fan coil and its remote controller is not shown in the figure.
Indoor pressure sensors 6 are arranged in each air-conditioning room 2, and outdoor pressure sensors 7 are arranged outside a building where the air-drawing heat-exchange central air conditioner is located;
the heat pump system comprises a variable frequency compressor 9, an evaporator 10, a throttling device 11 and a condenser 12 which are circularly communicated through a refrigerant pipeline 8; the air-conditioning water pipeline comprises a first air-conditioning water pipeline 13 and a second air-conditioning water pipeline 14; the water return pipeline comprises a first water return pipeline 15 and a second water return pipeline 16;
a first heat exchange box 17 is arranged on the periphery of the evaporator 10, two opposite ends of the first heat exchange box 17 are respectively communicated with the first water return pipeline 15 and the first air-conditioning water pipeline 13, a second heat exchange box 18 is arranged on the periphery of the condenser 12, and two opposite ends of the second heat exchange box 18 are respectively communicated with the second water return pipeline 16 and the second air-conditioning water pipeline 14;
the first air-conditioning water pipeline 13 and the second air-conditioning water pipeline 14 are both communicated with an air-conditioning circulating water main pipe 19; the fresh air main pipe 1 is provided with a fresh air fan 20, each air conditioner water inlet pipe 3 is respectively communicated with the air conditioner circulating water main pipe 19 through an air conditioner branch pipe 21, and each air conditioner room 2 is respectively communicated with the fresh air main pipe 1 through a fresh air branch pipe 22; each air-conditioning room 2 is internally provided with an air valve for closing or opening the fresh air branch pipe 22; the air valve is prior art and not shown.
The first heat exchange box 17 is communicated with a first air pulling air inlet pipe 23 and a first air pulling air outlet pipe 24, the first air pulling air outlet pipe 24 is connected to the top of the first heat exchange box 17, the first air pulling air inlet pipe 23 is connected to the bottom of the first heat exchange box 17 and provided with a first air inlet electromagnetic valve 25, and the tail end (free end) of the first air pulling air inlet pipe 23 is provided with an opening; the first air extracting and outlet pipe 24 extends upwards for more than 3 meters and is provided with an opening at the top end;
the second heat exchange box 18 is communicated with a second air pulling air inlet pipe 26 and a second air pulling air outlet pipe 27, the second air pulling air outlet pipe 27 is connected to the top of the second heat exchange box 18, the second air pulling air inlet pipe 26 is connected to the bottom of the second heat exchange box 18 and provided with a second air inlet electromagnetic valve 28, and the tail end of the second air pulling air inlet pipe 26 is provided with an opening; the second air extracting and outlet pipe 27 extends upwards for more than 3 meters and is provided with an opening at the top end;
the first water return pipeline 15 and the second water return pipeline 16 are both communicated with a water return header pipe 29; a first water return pump 30 is arranged on the first water return pipeline 15, and a second water return pump 31 is arranged on the second water return pipeline 16;
a water return main pipe temperature sensor 32 and a water return main pipe pressure sensor 33 are arranged in the water return main pipe 29, and a water return branch pipe temperature sensor 34 and a water return branch pipe pressure sensor 35 are respectively arranged in each water return branch pipe 4;
a fresh air temperature sensor 36 and a fresh air pressure sensor 37 are arranged in the fresh air main pipe 1; an air conditioner temperature sensor 38 and an air conditioner pressure sensor 39 are arranged in the air conditioner circulating water main pipe 19;
a water return tee joint 40 is arranged in the middle of the water return main pipe 29, the water return tee joint 40 is connected to the water return main pipe 29 in series through two interfaces of the water return tee joint 40, and the other interface of the water return tee joint 40 is connected with each water return branch pipe 4; a first switching electromagnetic valve 41 and a second switching electromagnetic valve 42 are respectively arranged on the water return header pipes 29 on two sides of the water return tee joint 40;
each air-conditioning branch pipe 21 is respectively provided with an air-conditioning water inlet electromagnetic valve 43, each fresh air branch pipe 22 is provided with a fresh air electromagnetic valve 44, the first air-drawing air outlet pipe 24 is provided with a first air-drawing electromagnetic valve 45, and the second air-drawing air outlet pipe 27 is provided with a second air-drawing electromagnetic valve 46;
a first air-conditioning water pump 47 and a first air-conditioning electromagnetic valve 48 are arranged on the first air-conditioning water pipeline 13, and a second air-conditioning water pump 49 and a second air-conditioning electromagnetic valve 50 are arranged on the second air-conditioning water pipeline 14;
the invention also comprises a main electric control device 51, wherein the fan coil electric control device 5 is connected with the main electric control device 51 through a line;
the main electric control device 51 is connected with the water return main pipe temperature sensor 32, the water return main pipe pressure sensor 33, the water return branch pipe temperature sensor 34, the water return branch pipe pressure sensor 35, the fresh air temperature sensor 36, the fresh air pressure sensor 37, the air conditioner temperature sensor 38, the air conditioner pressure sensor 39, the indoor pressure sensor 6, the outdoor pressure sensor 7, the fresh air fan 20, the first water return pump 30, the second water return pump 31, the first air conditioner water pump 47, the second air conditioner water pump 49, the first air inlet electromagnetic valve 25, the second air inlet electromagnetic valve 28, the first switching electromagnetic valve 41, the second switching electromagnetic valve 42, the air conditioner water inlet electromagnetic valve 43, the fresh air electromagnetic valve 44, the first air exhaust electromagnetic valve 45, the second air exhaust electromagnetic valve 46, the first air conditioner electromagnetic valve 48, the second air conditioner electromagnetic valve 50, each air valve and the frequency conversion compressor 9;
the motors of the first water return pump 30, the second water return pump 31, the first air-conditioning water pump 47, the second air-conditioning water pump 49 and the fresh air fan 20 are all variable frequency motors; the frequency conversion interval is arranged between the highest frequency and the lowest frequency of each variable frequency motor, and the average value of the highest frequency and the lowest frequency of each variable frequency motor is the intermediate frequency of the corresponding variable frequency motor; the difference value between the highest frequency and the lowest frequency of each variable frequency motor is the variable frequency amplitude of the motor; the frequency regulation amplitude of each frequency conversion action is one twentieth of the frequency conversion amplitude of the motor;
the main electric control device 51 stores a target pressure difference between indoor air pressure and outdoor air pressure, wherein the target pressure difference is 0.01MPa, and the indoor air pressure is higher than the outdoor air pressure; the main electric control device 51 stores target pressure difference between the air pressure in the fresh air main pipe 1 and the outdoor air pressure, the target pressure difference is 0.02-0.05 MPa (including two end values), and the air pressure in the fresh air main pipe 1 is higher than the outdoor air pressure;
the top of one end of the first heat exchange box 17, which is communicated with the first water return pipeline 15, is also communicated with a first forced heat exchange air pipe 52, the first forced heat exchange air pipe 52 and the first air pulling and air outlet pipe 24 are arranged side by side, and the upper end of the first forced heat exchange air pipe 52 is communicated with the first air pulling and air outlet pipe 24 above the first air pulling electromagnetic valve 45; the first forced heat exchange air duct 52 is provided with a first forced heat exchange fan 53 and a first forced ventilation electromagnetic valve 62; the first forced draft electromagnetic valve 62 is positioned below the first forced heat exchange fan 53;
the top of one end of the second heat exchange box 18, which is communicated with the second water return pipeline 16, is also communicated with a second forced heat exchange air pipe 55, the second forced heat exchange air pipe 55 and a second air pulling and air outlet pipe 27 are arranged side by side, and the upper end of the second forced heat exchange air pipe 55 is communicated with the second air pulling and air outlet pipe above the second air pulling electromagnetic valve 46; a second forced heat exchange fan 54 and a second forced ventilation electromagnetic valve 56 are arranged on the second forced heat exchange air pipe 55; a second forced draft solenoid valve 56 is located below the second forced heat exchange fan 54; the first forced heat exchange fan 53, the second forced heat exchange fan 54, the first forced ventilation solenoid valve 62 and the second forced ventilation solenoid valve 56 are respectively connected with the main electronic control device 51.
The main energy consuming component of the heat pump system is the compressor, and the power of the compressor of the central air conditioner is the largest among the power of all the components.
The first forced heat exchange fan 53 and the second forced heat exchange fan 54 are arranged, when the system load is large and the natural draft ventilation heat exchange quantity is insufficient (the condenser 12 is over-high in temperature in summer and the evaporator is over-low in temperature in winter), the heat exchange quantity between the evaporator (in winter) or the condenser 12 (in summer) and the ambient air is increased through forced ventilation by opening the first forced heat exchange fan 53 (in winter) or the second forced heat exchange fan 54 (in summer), so that the pressure difference between the evaporator and the condenser 12 is reduced, and the power of the variable frequency compressor 9 is reduced. The operation power of the forced heat exchange fan is far less than the power of the compressor reduced due to the reduction of the pressure difference, so that the arrangement can play a significant role in reducing the energy consumption of the system when the system load is large and the ventilation quantity of the air-pulling heat exchange is insufficient, and the energy-saving effect is very significant when the outdoor temperature exceeds 36 ℃ in summer or is lower than-10 ℃ in winter.
The top ends of the first air-drawing air-out pipe 24 and the second air-drawing air-out pipe 27 are respectively provided with an air cap 57 for shielding rain and preventing sundries from falling.
The hood 57 can prevent rainwater or impurities from falling into the first or second air-extracting air-out pipe along the top opening of the first or second air-extracting air-out pipe, so as to ensure smooth air passage and prevent water accumulation in the first and second heat exchange boxes.
A first water return electromagnetic valve 58 is arranged on the first water return pipeline 15 at the outlet of the first water return pump 30, and a second water return electromagnetic valve 59 is arranged on the second water return pipeline 16 at the outlet of the second water return pump 31;
the first return electromagnetic valve 58 and the second return electromagnetic valve 59 are respectively connected with the main electric control device 51.
The heat pump system is arranged at the top of a building, the bottom surface of the variable frequency compressor 9 is connected with a rubber cushion pad, the rubber cushion pad is connected with a silencing layer downwards, and the silencing layer is connected with a building supporting structure downwards.
The top of the building is usually an area of non-daily activities and is suitable for arranging various functional devices. The top of the building is ventilated to facilitate heat exchange between the evaporator 10 or condenser 12 and the ambient air. The rubber buffer can alleviate the vibration that 9 during operations of frequency conversion compressor produced, and rubber buffer and amortization layer play the effect of noise reduction jointly. The rubber cushion and the sound deadening layer are of conventional construction and are not shown.
And each water return branch pipe 4 is provided with an air conditioner water return electromagnetic valve 60, and the air conditioner water return electromagnetic valves 60 are connected with the main electric control device 51.
The throttling device 11 is a throttling valve or a capillary tube. The general electric control device 51 is a single chip microcomputer.
The invention also discloses an operation method of the building cooling and heating system, which is carried out by pulling out the air to exchange heat with the central air conditioner, and each electromagnetic valve is in a closed state before the operation method of the building cooling and heating system is started in summer or winter; a frequency conversion interval is arranged between the highest frequency and the lowest frequency of the variable frequency compressor 9, and the average value of the highest frequency and the lowest frequency is an intermediate frequency; the difference value between the highest frequency and the lowest frequency is the variable frequency amplitude of the compressor; the frequency regulation amplitude of each frequency conversion action is one twentieth of the frequency conversion amplitude of the compressor;
the operation method comprises a cooling operation method and a heating operation method; in the processes of the cooling operation method and the heating operation method, the user of each air-conditioning room 2 opens or closes the air valve independently;
the cooling operation method comprises the following steps:
the first step is to adjust the running state; the staff adjusts the system running state to summer running state through the main electric control device 51; the summer operation state is as follows: the first air inlet solenoid valve 25 is normally closed so as to prevent return water from flowing out through the first air inlet solenoid valve 25, and the second air inlet solenoid valve 28 and the second air drawing solenoid valve 46 are both opened so as to allow ambient air to enter the second heat exchange box 18 to realize air drawing and heat dissipation; the first forced ventilation solenoid valve 62 is normally closed, so that the backwater is isolated from the first forced heat exchange fan 53; the second forced ventilation solenoid valve 56 is normally open; the first switching electromagnetic valve 41 is normally open so that the return water enters the first heat exchange box and exchanges heat with the evaporator, and the second switching electromagnetic valve 42 is normally closed so as to prevent the return water from entering the second heat exchange box 18; the first air conditioning solenoid valve 48 is opened and the second air conditioning solenoid valve 50 is closed, thereby cooling the air conditioning circulating water through the evaporator and isolating the air conditioning circulating water from the condenser 12; the air conditioner backwater electromagnetic valve 60 is normally open; the target temperature in the air-conditioning circulating water main pipe 19 in summer is 10 ℃;
the second step is a starting step, wherein a worker starts the variable frequency compressor 9, the first air-conditioning water pump 47 and the fresh air fan 20 through the main electric control device 51, so that the variable frequency compressor 9 works in the highest frequency state, the temperature of the evaporator is rapidly reduced, and the temperature of the condenser 12 is rapidly increased;
the main electric control device 51 monitors the water temperature and the water pressure in the air-conditioning circulating water main pipe 19 through the air-conditioning temperature sensor 38 and the air-conditioning pressure sensor 39; when the temperature of water in the air-conditioning circulating water main pipe 19 is reduced to 10 ℃, normal summer variable frequency control is carried out on the variable frequency compressor 9; the frequency conversion control in summer is as follows: when the temperature of water in the air-conditioning circulating water main pipe 19 is more than or equal to 11 ℃, the main electric control device 51 controls the variable frequency compressor 9 to work at the highest frequency; when the temperature of water in the air-conditioning circulating water main pipe 19 is lower than 9 ℃, the main electric control device 51 controls the variable-frequency compressor 9 to stop; when the water temperature in the air-conditioning circulating water main pipe 19 is equal to 9 ℃, the main electric control device 51 controls the variable frequency compressor 9 to work at the lowest frequency; when the water temperature in the air-conditioning circulating water main pipe 19 is equal to 10 ℃, the main electric control device 51 controls the variable frequency compressor 9 to work at the intermediate frequency; when the water temperature in the air-conditioning circulating water main pipe 19 is higher than 9 ℃ and lower than 11 ℃, the main electric control device 51 controls the variable frequency compressor 9 to perform frequency conversion action of once frequency increase when the water temperature in the air-conditioning circulating water main pipe 19 increases by 0.1 ℃ until the variable frequency compressor 9 works at the highest frequency; when the water temperature in the air-conditioning circulating water main pipe 19 is reduced by 0.1 ℃, the main electric control device 51 controls the variable frequency compressor 9 to perform a frequency conversion action with reduced frequency once until the variable frequency compressor 9 works at the lowest frequency; therefore, when the maximum power of the variable frequency compressor 9 can meet the system requirement, the water temperature in the air conditioner circulating water main pipe 19 fluctuates within the range of 10 +/-1 ℃, the fluctuation of the water temperature is small, the frequency change of the variable frequency compressor 9 is smooth, and the increase of energy consumption caused by large frequency modulation is avoided; the water heater works at the highest frequency when the water temperature is high, which is beneficial to quickly reaching the target temperature and ensuring the user demand (the summer demand is cold, and the winter demand is hot).
The third step is to continuously perform frequency conversion control in summer, and simultaneously perform air pressure regulation and fresh air energy-saving regulation by the main electric control device 51;
the air pressure adjusting method comprises the following steps: the main electric control device 51 continuously monitors the fresh air temperature, the fresh air pressure, the outdoor air pressure and the indoor air pressure through the fresh air temperature sensor 36, the fresh air pressure sensor 37, the indoor pressure sensor 6 and the outdoor pressure sensor 7; when the air valve of one air-conditioning room 2 is closed (at this time, the pressure difference between the indoor air pressure and the outdoor air pressure of the air-conditioning room 2 cannot be adjusted), stopping monitoring the indoor air pressure of the air-conditioning room 2; when the air valve of one air-conditioning room 2 is opened, the indoor air pressure of the air-conditioning room 2 is monitored again;
when the pressure difference between the air pressure in the fresh air main pipe 1 and the outdoor air pressure is a target pressure difference, the fresh air fan 20 works at the middle frequency; when the pressure difference between the air pressure in the fresh air main pipe 1 and the outdoor air pressure rises from a target pressure difference (namely, a pressure difference value obtained by subtracting the outdoor air pressure from the air pressure in the fresh air main pipe 1), the main electric control device 51 controls the fresh air fan 20 to perform frequency conversion action with frequency reduction once when the pressure difference rises by 0.001MPa, until the fresh air fan 20 works at the lowest frequency; when the pressure difference between the fresh air main pipe 1 and the outdoor air pressure is reduced by the target pressure difference, the total electric control device 51 controls the fresh air fan 20 to perform frequency conversion action with once frequency increase for increasing the pressure difference until the fresh air fan 20 works at the highest frequency when the pressure difference between the fresh air main pipe 1 and the outdoor air pressure is reduced by 0.001 MPa; this kind of control is very meticulous, can provide sufficient wind pressure in new trend house steward 1, and the new trend wind pressure that causes for the resistance of end pipeline and valve etc. descends the headspace, can continuously and stably provide the new trend wind pressure, and the wind pressure is undulant little simultaneously, and new trend fan 20 operating mode is steady, and the consumption is lower.
When the pressure difference between the indoor air pressure and the outdoor air pressure of the air-conditioning room 2 is a target pressure difference, the main electric control device 51 controls the corresponding fresh air electromagnetic valve 44 to be in a half-open state, and when the pressure difference between the indoor air pressure and the outdoor air pressure is lower than 0.005MPa, the main electric control device 51 controls the corresponding fresh air electromagnetic valve 44 to be in a full-open state; like this, can prevent that indoor atmospheric pressure from crossing lowly, guarantee indoor state that is in the pressure-fired, avoid frequently operating new trend solenoid valve 44 simultaneously.
The fresh air energy-saving adjusting method comprises the following steps: when the air valve of one air-conditioning room 2 is closed, the fresh air energy-saving regulation is not carried out on the air-conditioning room 2;
for each air-conditioning room 2 with the air valve opened, the main electric control device 51 continuously monitors the fresh air temperature, the opening and closing state of the fan coil electric control device 5 of each air-conditioning room 2 and the air-conditioning temperature (usually about 27 ℃ in summer and about 19 ℃ in winter) set by the user of the air-conditioning room 2 for the fan coil electric control device 5 in the opening state through the fresh air temperature sensor 36 and the fan coil electric control device 5 of each air-conditioning room 2; when the fresh air temperature is less than or equal to the air-conditioning temperature set by a user of one air-conditioning room 2 for the fan coil electric control device 5, closing the air-conditioning water inlet electromagnetic valve 43 corresponding to the air-conditioning room 2, and adjusting the opening degree of the fresh air electromagnetic valve 44 corresponding to the air-conditioning room 2 to be in a full-open state; the power of the variable frequency compressor 9 in the heat pump system is far larger than that of the fan, and the temperature requirement can be met only by using fresh air for the air conditioning room 2 where a user with a small temperature requirement is located through the fresh air energy-saving adjusting method, so that the load of the heat pump system is reduced, and energy is saved. The energy-saving effect of the fresh air energy-saving adjusting method is particularly obvious in a period of time when the air conditioning season starts and ends. When the fresh air temperature is higher than the air-conditioning temperature set by a user of one air-conditioning room 2 for the fan coil electric control device 5, the air-conditioning water inlet electromagnetic valve 43 is opened, and the working frequency of the fresh air fan 20 and the state of the fresh air electromagnetic valve are adjusted according to the air pressure adjusting method;
the heat supply operation method comprises the following steps:
the first step is to adjust the running state; the staff adjusts the system running state to be a winter running state through the main electric control device 51; the winter running state is as follows: the second air inlet electromagnetic valve 28 is normally closed, so that the return water is prevented from flowing out through the second air inlet electromagnetic valve 28, and the first air inlet electromagnetic valve 25 and the first air drawing electromagnetic valve 45 are both opened, so that the ambient air is allowed to enter the first heat exchange box to realize air drawing and heat dissipation; the second forced ventilation solenoid valve 56 is normally closed, so that the backwater is isolated from the second forced heat exchange fan 54; the first forced ventilation solenoid valve 62 is normally open; the second switching electromagnetic valve 42 is normally opened so that the return water enters the second heat exchange box and exchanges heat with the condenser, and the first switching electromagnetic valve 41 is normally closed so as to prevent the return water from entering the first heat exchange box; the second air conditioning solenoid valve 50 is opened and the first air conditioning solenoid valve 48 is closed, thereby heating the air conditioning circulating water through the condenser and isolating the air conditioning circulating water from the evaporator 10; the air conditioner backwater electromagnetic valve 60 is normally open; the target temperature in the air-conditioning circulating water main pipe 19 in winter is 55 ℃;
the second step is a starting step, a worker starts the variable frequency compressor 9, the second air-conditioning water pump 49 and the fresh air fan 20 through the main electric control device 51, and the variable frequency compressor 9 works in the highest frequency state, so that the temperature of the evaporator is rapidly reduced, and the temperature of the condenser 12 is rapidly increased;
the main electric control device 51 monitors the water temperature and the water pressure in the air-conditioning circulating water main pipe 19 through the air-conditioning temperature sensor 38 and the air-conditioning pressure sensor 39; when the temperature of water in the air-conditioning circulating water main pipe 19 rises to 55 ℃, carrying out normal winter frequency conversion control on the frequency conversion compressor 9; the winter variable frequency control is as follows: when the temperature of water in the air-conditioning circulating water main pipe 19 is lower than or equal to 53 ℃, the main electric control device 51 controls the variable frequency compressor 9 to work at the highest frequency; when the water temperature in the air-conditioning circulating water main pipe 19 is higher than 57 ℃, the main electric control device 51 controls the variable-frequency compressor 9 to stop; when the water temperature in the air-conditioning circulating water main pipe 19 is equal to 57 ℃, the electric control device controls the variable-frequency compressor 9 to work at the lowest frequency; when the water temperature in the air-conditioning circulating water main pipe 19 is equal to 55 ℃, the main electric control device 51 controls the variable frequency compressor 9 to work at the intermediate frequency; when the water temperature in the air-conditioning circulating water main pipe 19 is higher than 53 ℃ and lower than 57 ℃, the main electric control device 51 controls the variable frequency compressor 9 to perform a frequency conversion action of frequency reduction every time the water temperature in the air-conditioning circulating water main pipe 19 rises by 0.2 ℃ until the variable frequency compressor 9 works at the lowest frequency; when the water temperature in the air-conditioning circulating water main pipe 19 is reduced by 0.2 ℃, the main electric control device 51 controls the variable frequency compressor 9 to perform frequency conversion action of frequency increase for one time until the variable frequency compressor 9 works at the highest frequency; therefore, when the maximum power of the variable frequency compressor 9 can meet the system requirement, the water temperature in the air-conditioning circulating water main pipe 19 fluctuates within the interval of 55 +/-2 ℃, the fluctuation of the water temperature is small, the frequency change of the variable frequency compressor 9 is smooth, and the increase of energy consumption caused by large frequency modulation is avoided; when the water temperature is lower, the water heater works at the highest frequency, which is beneficial to quickly reaching the target temperature and ensuring the heating requirement. The indoor and outdoor temperature difference in winter is greater than the indoor and outdoor temperature difference in summer, people are lower than summer in the sensitivity degree of air temperature change in winter, so the fluctuation of the water temperature in the air-conditioning circulating water main pipe 19 is slightly enlarged in summer without influencing the heating experience of people, and after the fluctuation of the water temperature in the air-conditioning circulating water main pipe 19 is enlarged, the frequency of frequency conversion action of the frequency conversion compressor 9 is obviously reduced, so that the energy-saving effect is achieved (when the frequency is increased, as when the frequency is started, the energy consumption can be greater than that when the frequency is stably worked, and the energy consumption increased when the frequency of the frequency conversion electrical appliance is increased is greatly less than that when the. In a word, the indoor air temperature fluctuation in winter is properly larger than the indoor air temperature fluctuation in summer, so that the experience of people is not influenced, and the energy consumption is reduced.
The third step is to continuously carry out winter frequency conversion control; when the winter frequency conversion control is continuously carried out, the main electric control device 51 carries out air pressure regulation and fresh air energy-saving regulation;
firstly, the method for regulating the air pressure in winter is the same as the method for regulating the air pressure in summer;
the fresh air energy-saving adjusting method comprises the following steps: when the air valve of one air-conditioning room 2 is closed, the fresh air energy-saving regulation is not carried out on the air-conditioning room 2;
for each air-conditioning room 2 with the air valve opened, the main electric control device 51 continuously monitors the fresh air temperature, the opening and closing state of the fan coil electric control device 5 of each air-conditioning room 2 and the air-conditioning temperature (usually about 19 ℃ in winter) set by the user of the air-conditioning room 2 to the fan coil electric control device 5 in the opening state through the fresh air temperature sensor 36 and the fan coil electric control device 5 of each air-conditioning room 2; when the fresh air temperature reaches or exceeds the air-conditioning temperature set by a user of one air-conditioning room on the fan coil electric control device, closing the air-conditioning water inlet electromagnetic valve 43 corresponding to the air-conditioning room 2, and adjusting the opening degree of the fresh air electromagnetic valve 44 corresponding to the air-conditioning room 2 to be in a full-open state; when the fresh air temperature is lower than the air-conditioning temperature set by a user of an air-conditioning room to the fan coil electric control device by 1 ℃, the air-conditioning water inlet electromagnetic valve 43 is opened, and the working frequency of the fresh air fan 20 and the state of the fresh air electromagnetic valve are adjusted according to the air pressure adjusting method.
An evaporation temperature sensor 63 is arranged at the evaporator, a condensation temperature sensor 64 is arranged at the condenser 12, and the evaporation temperature sensor 63 and the condensation temperature sensor 64 are respectively connected with the main electric control device 51;
the general electric control device 51 stores therein normal operating parameters of the heat pump system, including an evaporator operating temperature range and a condenser 12 operating temperature range; the overall electronic control unit 51 continuously monitors the actual temperature at the evaporator 10 and at the condenser 12 via the evaporation temperature sensor 63 and the condensation temperature sensor 64;
in summer, when the temperature of the condenser 12 is higher than the working temperature range of the condenser 12, the total electric control device 51 opens the second forced heat exchange fan 54 to increase the ventilation heat exchange amount of the condenser 12, so as to reduce the temperature of the condenser 12; after the temperature of the condenser 12 falls back into the working temperature range of the condenser 12, delaying for 4-10 minutes and closing the second forced heat exchange fan 54; the delayed closing can prevent the forced heat exchange fan from being frequently started and closed; forced ventilation can make up for the deficiency of natural draft ventilation heat exchange quantity when the system load is larger.
In winter, when the temperature of the evaporator is lower than the working temperature range of the evaporator, the main electric control device 51 opens the first forced heat exchange fan 53 to increase the ventilation heat exchange quantity of the evaporator, so as to increase the temperature of the evaporator; and after the temperature of the evaporator is increased back to the working temperature range of the evaporator, the first forced heat exchange fan 53 is turned off after delaying for 4-10 minutes.
In the third step of the cooling operation method, when the frequency conversion control in summer is continuously performed, the main electric control device 51 performs the summer constant temperature regulation on each air-conditioning room 2 respectively;
the summer constant temperature regulation is that the main electric control device 51 reads the actual temperature in the air-conditioning room 2 and the air-conditioning temperature set by the user through the fan coil electric control device 5, and when the actual temperature in the air-conditioning room 2 is equal to the air-conditioning temperature set by the user, the main electric control device 51 controls the corresponding air-conditioning water inlet electromagnetic valve 43 to be in a half-open state; when the actual temperature in the air-conditioning room 2 is more than or equal to the air-conditioning temperature set by the user by 1 ℃, the main electric control device 51 controls the corresponding air-conditioning water inlet electromagnetic valve 43 to be in a full-open state; when the actual temperature in the air-conditioning room 2 is less than or equal to the air-conditioning temperature set by the user, which is 1 ℃, the main electric control device 51 controls the corresponding air-conditioning water inlet electromagnetic valve 43 to be closed;
when the fan coil electric control device 5 is closed, the main electric control device 51 controls the corresponding air conditioner water inlet electromagnetic valve 43 to be closed;
the ordinary fan coil device also has a temperature adjusting function, and constant temperature control is realized by adjusting the power of the fan. The invention can carry out double constant temperature control through the main electric control device 51 and the air conditioner water inlet electromagnetic valve 43, can ensure constant temperature effect when the fan coil is out of control, and has better constant temperature effect. In a conventional fan coil for a central air conditioner, after an indoor temperature reaches a set value, only a fan of the fan coil can be stopped at most, and a medium (such as water) carrying cold or heat passing through the fan coil cannot be stopped. In summer, because the fan of the fan coil stops running, the indoor air temperature at the fan coil is greatly reduced, and the condensation phenomenon at the fan coil can be generated. The invention can directly stop the medium carrying cold or heat from being led into the fan coil, thereby not only preventing the fan coil from continuously supplying cold (summer) or heat (winter) when the air conditioner is not needed, thereby saving energy, but also avoiding the condensation phenomenon at the fan coil when the fan coil is closed in summer.
In the third step of the heating operation method, when the winter variable frequency control is continuously performed, the main electric control device 51 performs winter constant temperature adjustment on each air-conditioning room 2 respectively;
in winter temperature setting adjustment, the main electric control device 51 reads the actual temperature in the air-conditioning room 2 and the air-conditioning temperature set by a user through the fan coil electric control device 5, and when the actual temperature in the air-conditioning room 2 is equal to the air-conditioning temperature set by the user, the main electric control device 51 controls the corresponding air-conditioning water inlet electromagnetic valve 43 to be in a half-open state; when the actual temperature in the air-conditioning room 2 is less than or equal to the air-conditioning temperature set by the user, which is 1.5 ℃, the main electric control device 51 controls the corresponding air-conditioning water inlet electromagnetic valve 43 to be in a full open state; when the actual temperature in the air-conditioned room 2 is more than or equal to the air-conditioned temperature set by the user, 1.5 ℃, the main electric control device 51 controls the corresponding air-conditioned water inlet electromagnetic valve 43 to be closed; when the fan coil electric control device 5 is closed, the main electric control device 51 controls the corresponding air conditioner water inlet electromagnetic valve 43 to be closed.
The main electric control device 51 is connected with a display 61, and the main electric control device 51 continuously monitors the pressure in each return branch pipe 4 through the return branch pipe pressure sensor 35; the main electric control device 51 calculates the pressure difference between each water return branch pipe 4 and the water return main pipe 29 and calculates the average value of the pressure difference between each water return branch pipe 4 and the water return main pipe 29;
when the pressure difference between one water return branch pipe 4 and the water return main pipe 29 is more than or equal to two times of the average value of the pressure differences, the water return branch pipe 4 is indicated to be damaged, and the main electric control device 51 displays alarm information on the display 61 to prompt a worker to maintain. The pressure difference and the average value of the pressure difference are absolute values here.
In the first step of the cooling operation method, the main electronic control device 51 opens the first water return electromagnetic valve 58 and closes the second water return electromagnetic valve 59, preventing the return water from entering the second heat exchange tank.
In the first step of the heating operation method, the master electronic control unit 51 opens the second water return solenoid valve 59 and closes the first water return solenoid valve 58, preventing the return water from entering the first heat exchange tank.
The throttling device 11 is a throttling valve or a capillary tube, and the general electric control device 51 is a single chip microcomputer.
The above embodiments are only for illustrating but not limiting the technical solutions of the invention, and although the invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: it is contemplated that modifications and equivalents may be made thereto without departing from the spirit and scope of the invention in its aspects and as set forth in the following claims.

Claims (6)

1. The operation method of the building cooling and heating system is carried out by drawing gas and exchanging heat through a central air conditioner; the air-drawing heat exchange central air conditioner comprises a heat pump system, a fresh air main pipe, an air conditioner water pipeline, a water return pipeline and a plurality of air conditioner rooms, wherein each air conditioner room is provided with a fan coil respectively, and the fan coil of each air conditioner room is connected with an air conditioner water inlet pipe and a water return branch pipe respectively; a fan coil electric control device and a fan coil temperature sensor for sensing indoor temperature are arranged in the fan coil, a display screen is arranged on the fan coil, the fan coil is provided with a circulating air inlet and a circulating air outlet, and a remote controller is matched with the fan coil electric control device;
the method is characterized in that:
indoor pressure sensors are arranged in all air-conditioning rooms, and outdoor pressure sensors are arranged outside a building where the air-drawing heat-exchange central air conditioner is located;
the heat pump system comprises a variable frequency compressor, an evaporator, a throttling device and a condenser which are circularly communicated through a refrigerant pipeline; the air-conditioning water pipeline comprises a first air-conditioning water pipeline and a second air-conditioning water pipeline; the water return pipeline comprises a first water return pipeline and a second water return pipeline;
a first heat exchange box is arranged on the periphery of the evaporator, two opposite ends of the first heat exchange box are respectively communicated with the first water return pipeline and the first air-conditioning water pipeline, a second heat exchange box is arranged on the periphery of the condenser, and two opposite ends of the second heat exchange box are respectively communicated with the second water return pipeline and the second air-conditioning water pipeline;
the first air-conditioning water pipeline and the second air-conditioning water pipeline are both communicated with an air-conditioning circulating water main pipe; the fresh air main pipe is provided with a fresh air fan, each air conditioner water inlet pipe is respectively communicated with the air conditioner circulating water main pipe through an air conditioner branch pipe, and each air conditioner room is respectively communicated with the fresh air main pipe through a fresh air branch pipe; air valves for closing or opening the fresh air branch pipes are arranged in each air-conditioning room;
the first heat exchange box is communicated with a first air pulling air inlet pipe and a first air pulling air outlet pipe, the first air pulling air outlet pipe is connected to the top of the first heat exchange box, the first air pulling air inlet pipe is connected to the bottom of the first heat exchange box and provided with a first air inlet electromagnetic valve, and the tail end of the first air pulling air inlet pipe is provided with an opening; the first air extracting and outlet pipe extends upwards for more than 3 meters, and the top end of the first air extracting and outlet pipe is provided with an opening;
the second heat exchange box is communicated with a second air pulling air inlet pipe and a second air pulling air outlet pipe, the second air pulling air outlet pipe is connected to the top of the second heat exchange box, the second air pulling air inlet pipe is connected to the bottom of the second heat exchange box and provided with a second air inlet electromagnetic valve, and the tail end of the second air pulling air inlet pipe is provided with an opening; the second air extracting and discharging pipe extends upwards for more than 3 meters and is provided with an opening at the top end;
the first air-drawing air-out pipe is provided with a first air-drawing electromagnetic valve, and the second air-drawing air-out pipe is provided with a second air-drawing electromagnetic valve;
the first water return pipeline and the second water return pipeline are communicated with a water return main pipe; a first water return pump is arranged on the first water return pipeline, and a second water return pump is arranged on the second water return pipeline;
a backwater main pipe temperature sensor and a backwater main pipe pressure sensor are arranged in the backwater main pipe, and a backwater branch pipe temperature sensor and a backwater branch pipe pressure sensor are respectively arranged in each backwater branch pipe;
a fresh air temperature sensor and a fresh air pressure sensor are arranged in the fresh air main pipe; an air conditioner temperature sensor and an air conditioner pressure sensor are arranged in the air conditioner circulating water main pipe;
the middle part of the water return main pipe is provided with a water return tee joint, the water return tee joint is connected to the water return main pipe in series through two interfaces of the water return tee joint, and the other interface of the water return tee joint is connected with each water return branch pipe; a first switching electromagnetic valve and a second switching electromagnetic valve are respectively arranged on the water return main pipes on two sides of the water return tee;
air conditioner water inlet electromagnetic valves are respectively arranged on the air conditioner branch pipes, fresh air electromagnetic valves are arranged on the fresh air branch pipes, a first air conditioner water pump and a first air conditioner electromagnetic valve are arranged on the first air conditioner water pipeline, and a second air conditioner water pump and a second air conditioner electromagnetic valve are arranged on the second air conditioner water pipeline;
the fan coil electric control device is connected with the main electric control device through a line;
the main electric control device is connected with the return water main pipe temperature sensor, the return water main pipe pressure sensor, the return water branch pipe temperature sensor, the return water branch pipe pressure sensor, the fresh air temperature sensor, the fresh air pressure sensor, the air conditioner temperature sensor, the air conditioner pressure sensor, the indoor pressure sensor, the outdoor pressure sensor, the fresh air fan, the first return water pump, the second return water pump, the first air conditioner water pump, the second air conditioner water pump, the first air inlet electromagnetic valve, the second air inlet electromagnetic valve, the first switching electromagnetic valve, the second switching electromagnetic valve, the air conditioner water inlet electromagnetic valve, the fresh air electromagnetic valve, the first air exhaust electromagnetic valve, the second air exhaust electromagnetic valve, the first air conditioner electromagnetic valve, the second air conditioner electromagnetic valve, each air valve and the variable frequency compressor;
the first water return pump, the second water return pump, the first air-conditioning water pump, the second air-conditioning water pump and the fresh air fan are all variable frequency motors; the frequency conversion interval is arranged between the highest frequency and the lowest frequency of each variable frequency motor, and the average value of the highest frequency and the lowest frequency of each variable frequency motor is the intermediate frequency of the corresponding variable frequency motor; the difference value between the highest frequency and the lowest frequency of each variable frequency motor is the variable frequency amplitude of the motor; the frequency regulation amplitude of each frequency conversion action is one twentieth of the frequency conversion amplitude of the motor;
the total electric control device stores a target pressure difference between indoor air pressure and outdoor air pressure, the target pressure difference is 0.01MPa, and the indoor air pressure is higher than the outdoor air pressure; the main electric control device stores target pressure difference between the air pressure in the fresh air main pipe and the outdoor air pressure, the target pressure difference is 0.02-0.05 MPa, and the air pressure in the fresh air main pipe is higher than the outdoor air pressure;
before the operation method of the building cooling and heating system is started in summer or winter, all the electromagnetic valves are in a closed state; the frequency conversion interval is arranged between the highest frequency and the lowest frequency of the frequency conversion compressor, and the average value of the highest frequency and the lowest frequency is the intermediate frequency; the difference value between the highest frequency and the lowest frequency is the variable frequency amplitude of the compressor; the frequency regulation amplitude of each frequency conversion action is one twentieth of the frequency conversion amplitude of the compressor;
the operation method comprises a cooling operation method and a heating operation method; in the processes of the cooling operation method and the heating operation method, users of all air-conditioning rooms independently open or close the air valves;
the cooling operation method comprises the following steps:
the first step is to adjust the running state; the working personnel adjust the system running state to be a summer running state through the main electric control device; the summer operation state is as follows: the first air inlet electromagnetic valve is normally closed, so that return water is prevented from flowing out through the first air inlet electromagnetic valve, and the second air inlet electromagnetic valve and the second air drawing electromagnetic valve are both opened, so that ambient air is allowed to enter the second heat exchange box to realize air drawing and heat dissipation; the first forced ventilation electromagnetic valve is normally closed, and the second forced ventilation electromagnetic valve is normally open; the first switching electromagnetic valve is normally open so that the return water enters the first heat exchange box and exchanges heat with the evaporator, and the second switching electromagnetic valve is normally closed so that the return water is prevented from entering the second heat exchange box; the first air-conditioning electromagnetic valve is opened, and the second air-conditioning electromagnetic valve is closed, so that the air-conditioning circulating water is cooled by the evaporator and isolated from the condenser; the target temperature in the circulating water main pipe of the air conditioner in summer is 10 ℃;
the second step is a starting step, wherein a worker starts the variable frequency compressor, the first air-conditioning water pump and the fresh air fan through the main electric control device, so that the variable frequency compressor works in the highest frequency state, the temperature of the evaporator is rapidly reduced, and the temperature of the condenser is rapidly increased;
the main electric control device monitors the water temperature and the water pressure in the air-conditioning circulating water main pipe through an air-conditioning temperature sensor and an air-conditioning pressure sensor; when the water temperature in the air-conditioning circulating water main pipe is reduced to 10 ℃, carrying out normal summer variable frequency control on the variable frequency compressor; the frequency conversion control in summer is as follows: when the temperature of water in the air-conditioning circulating water main pipe is more than or equal to 11 ℃, the main electric control device controls the variable frequency compressor to work at the highest frequency; when the temperature of water in the air-conditioning circulating water main pipe is lower than 9 ℃, the main electric control device controls the variable-frequency compressor to stop; when the water temperature in the air-conditioning circulating water main pipe is equal to 9 ℃, the main electric control device controls the variable frequency compressor to work at the lowest frequency; when the water temperature in the air-conditioning circulating water main pipe is equal to 10 ℃, the main electric control device controls the variable-frequency compressor to work at the intermediate frequency; when the water temperature in the air-conditioning circulating water main pipe is higher than 9 ℃ and lower than 11 ℃, the main electric control device controls the frequency conversion compressor to perform frequency conversion action of frequency increase once when the water temperature in the air-conditioning circulating water main pipe rises by 0.1 ℃ until the frequency conversion compressor works at the highest frequency; when the water temperature in the air-conditioning circulating water main pipe is reduced by 0.1 ℃, the main electric control device controls the variable frequency compressor to perform frequency conversion action with reduced frequency once until the variable frequency compressor works at the lowest frequency;
the third step is to continuously carry out frequency conversion control in summer, and simultaneously carry out air pressure regulation and fresh air energy-saving regulation by the main electric control device;
the air pressure adjusting method comprises the following steps: the main electric control device continuously monitors fresh air temperature, fresh air pressure, outdoor air pressure and indoor air pressure through a fresh air temperature sensor, a fresh air pressure sensor, an indoor pressure sensor and an outdoor pressure sensor; when an air valve of an air-conditioning room is closed, stopping monitoring the indoor air pressure of the air-conditioning room; when an air valve of an air-conditioning room is opened, restoring and monitoring the indoor air pressure of the air-conditioning room;
when the pressure difference between the air pressure in the fresh air main pipe and the outdoor air pressure is a target pressure difference, the fresh air fan works at the middle frequency; when the pressure difference between the air pressure in the fresh air main pipe and the outdoor air pressure rises from a target pressure difference, the total electric control device controls the fresh air fan to perform frequency conversion action of once frequency reduction for reducing the pressure difference until the fresh air fan works at the lowest frequency when the pressure difference rises by 0.001 MPa; when the pressure difference between the fresh air main pipe and the outdoor air pressure is reduced by a target pressure difference, the total electric control device controls the fresh air fan to perform frequency conversion action of increasing frequency once for increasing the pressure difference until the fresh air fan works at the highest frequency when the pressure difference between the fresh air main pipe and the outdoor air pressure is reduced by 0.001 MPa;
when the pressure difference between the indoor air pressure and the outdoor air pressure of the air-conditioning room is a target pressure difference, the main electric control device controls the corresponding fresh air electromagnetic valve to be in a half-open state, and when the pressure difference between the indoor air pressure and the outdoor air pressure is lower than 0.005MPa, the main electric control device controls the corresponding fresh air electromagnetic valve to be in a full-open state;
the fresh air energy-saving adjusting method comprises the following steps: when an air valve of one air-conditioning room is closed, fresh air energy-saving regulation is not carried out on the air-conditioning room;
for each air-conditioning room with the air valve opened, the main electric control device continuously monitors the fresh air temperature, the opening and closing state of the fan coil electric control device of each air-conditioning room and the air-conditioning temperature set by a user of the air-conditioning room for the fan coil electric control device in the opening state through a fresh air temperature sensor and the fan coil electric control device of each air-conditioning room; when the fresh air temperature is less than or equal to the air-conditioning temperature set by a user of one air-conditioning room for the fan coil electric control device, closing the air-conditioning water inlet electromagnetic valve corresponding to the air-conditioning room, and adjusting the opening degree of the fresh air electromagnetic valve corresponding to the air-conditioning room to be in a full-open state; when the fresh air temperature is higher than the air conditioner temperature set by a user of one air conditioner room for the fan coil electric control device, opening an air conditioner water inlet electromagnetic valve, and adjusting the working frequency of a fresh air fan and the state of the fresh air electromagnetic valve according to an air pressure adjusting method;
the heat supply operation method comprises the following steps:
the first step is to adjust the running state; the working personnel adjust the system running state to be a winter running state through the main electric control device; the winter running state is as follows: the second air inlet electromagnetic valve is normally closed, so that return water is prevented from flowing out through the second air inlet electromagnetic valve, and the first air inlet electromagnetic valve and the first air drawing electromagnetic valve are both opened, so that ambient air is allowed to enter the first heat exchange box to realize air drawing and heat dissipation; the second forced ventilation electromagnetic valve is normally closed, and the first forced ventilation electromagnetic valve is normally open; the second switching electromagnetic valve is normally open so that the return water enters the second heat exchange box and exchanges heat with the condenser, and the first switching electromagnetic valve is normally closed so that the return water is prevented from entering the first heat exchange box; the second air-conditioning electromagnetic valve is opened, and the first air-conditioning electromagnetic valve is closed, so that the air-conditioning circulating water passes through the condenser to be heated and is isolated from the evaporator; the target temperature in the air-conditioning circulating water main pipe in winter is 55 ℃;
the second step is a starting step, wherein a worker starts the variable frequency compressor, the second air-conditioning water pump and the fresh air fan through the main electric control device, and the variable frequency compressor works in the highest frequency state, so that the temperature of the evaporator is rapidly reduced, and the temperature of the condenser is rapidly increased;
the main electric control device monitors the water temperature and the water pressure in the air-conditioning circulating water main pipe through an air-conditioning temperature sensor and an air-conditioning pressure sensor; when the temperature of water in the air-conditioning circulating water main pipe rises to 55 ℃, carrying out normal winter variable frequency control on the variable frequency compressor; the winter variable frequency control is as follows: when the temperature of water in the air-conditioning circulating water main pipe is lower than or equal to 53 ℃, the main electric control device controls the variable frequency compressor to work at the highest frequency; when the water temperature in the air-conditioning circulating water main pipe is more than 57 ℃, the main electric control device controls the variable-frequency compressor to stop; when the water temperature in the air-conditioning circulating water main pipe is equal to 57 ℃, the electric control device controls the variable-frequency compressor to work at the lowest frequency; when the water temperature in the air-conditioning circulating water main pipe is equal to 55 ℃, the main electric control device controls the variable-frequency compressor to work at the intermediate frequency; when the water temperature in the air-conditioning circulating water main is higher than 53 ℃ and lower than 57 ℃, the main electric control device controls the frequency conversion compressor to perform frequency conversion action of once frequency reduction when the water temperature in the air-conditioning circulating water main rises to 0.2 ℃ until the frequency conversion compressor works at the lowest frequency; when the water temperature in the air conditioner circulating water main pipe is reduced by 0.2 ℃, the main electric control device controls the variable frequency compressor to perform frequency conversion action of frequency increase for one time until the variable frequency compressor works at the highest frequency;
the third step is to continuously carry out winter frequency conversion control; when the winter frequency conversion control is continuously carried out, the main electric control device carries out air pressure regulation and fresh air energy-saving regulation;
firstly, the method for regulating the air pressure in winter is the same as the method for regulating the air pressure in summer;
the fresh air energy-saving adjusting method comprises the following steps: when an air valve of one air-conditioning room is closed, fresh air energy-saving regulation is not carried out on the air-conditioning room;
for each air-conditioning room with the air valve opened, the main electric control device continuously monitors the fresh air temperature, the opening and closing state of the fan coil electric control device of each air-conditioning room and the air-conditioning temperature set by a user of the air-conditioning room for the fan coil electric control device in the opening state through a fresh air temperature sensor and the fan coil electric control device of each air-conditioning room; when the fresh air temperature reaches or exceeds the air-conditioning temperature set by a user of one air-conditioning room on the fan coil electric control device, closing the air-conditioning water inlet electromagnetic valve corresponding to the air-conditioning room, and adjusting the opening degree of the fresh air electromagnetic valve corresponding to the air-conditioning room to be in a full-open state; when the fresh air temperature is lower than the air-conditioning temperature set by a user of an air-conditioning room to the fan coil electric control device by 1 ℃, the air-conditioning water inlet electromagnetic valve is opened, and the working frequency of the fresh air fan and the state of the fresh air electromagnetic valve are adjusted according to the air pressure adjusting method.
2. A method of operating a building cooling and heating system according to claim 1, wherein: the top of one end of the first heat exchange box, which is communicated with the first water return pipeline, is also communicated with a first forced heat exchange air pipe, the first forced heat exchange air pipe and the first air pulling and air outlet pipe are arranged side by side, and the upper end of the first forced heat exchange air pipe is communicated with the first air pulling and air outlet pipe above the first air pulling electromagnetic valve; the first forced heat exchange air pipe is provided with a first forced heat exchange fan and a first forced ventilation electromagnetic valve; the first forced ventilation electromagnetic valve is positioned below the first forced heat exchange fan;
the top of one end of the second heat exchange box, which is communicated with the second water return pipeline, is also communicated with a second forced heat exchange air pipe, the second forced heat exchange air pipe and a second air drawing and air outlet pipe are arranged side by side, and the upper end of the second forced heat exchange air pipe is communicated with the second air drawing and air outlet pipe above the second air drawing electromagnetic valve; a second forced heat exchange fan and a second forced ventilation electromagnetic valve are arranged on the second forced heat exchange air pipe; the second forced ventilation electromagnetic valve is positioned below the second forced heat exchange fan; the second forced heat exchange fan, the first forced ventilation electromagnetic valve and the second forced ventilation electromagnetic valve are respectively connected with the main electric control device;
an evaporation temperature sensor is arranged at the evaporator, a condensation temperature sensor is arranged at the condenser, and the evaporation temperature sensor and the condensation temperature sensor are respectively connected with a main electric control device;
the main electric control device stores normal working parameters of the heat pump system, including the working temperature range of the evaporator and the working temperature range of the condenser; the main electric control device continuously monitors the actual temperature at the evaporator and the condenser through an evaporation temperature sensor and a condensation temperature sensor;
in summer, when the temperature of the condenser is higher than the working temperature range of the condenser, the main electric control device opens the second forced heat exchange fan to increase the ventilation heat exchange amount of the condenser, so that the temperature of the condenser is reduced; after the temperature of the condenser falls back into the working temperature range of the condenser, delaying for 4-10 minutes and closing the second forced heat exchange fan;
in winter, when the temperature of the evaporator is lower than the working temperature range of the evaporator, the main electric control device opens the first forced heat exchange fan to increase the ventilation and heat exchange quantity of the evaporator, so that the temperature of the evaporator is increased; and after the temperature of the evaporator is increased back to the working temperature range of the evaporator, delaying for 4-10 minutes and closing the first forced heat exchange fan.
3. A method of operating a building cooling and heating system according to claim 1, wherein: in the third step of the cooling operation method, when the summer variable frequency control is continuously carried out, the total electric control device respectively carries out summer constant temperature regulation on each air-conditioning room;
the summer constant temperature regulation is that the main electric control device reads the actual temperature in the air-conditioning room and the air-conditioning temperature set by a user through the fan coil electric control device, and when the actual temperature in the air-conditioning room is equal to the air-conditioning temperature set by the user, the main electric control device controls the corresponding air-conditioning water inlet electromagnetic valve to be in a half-open state; when the actual temperature in the air-conditioning room is more than or equal to the air-conditioning temperature set by the user and is 1 ℃, the main electric control device controls the corresponding air-conditioning water inlet electromagnetic valve to be in a full-open state; when the actual temperature in the air-conditioning room is less than or equal to the air-conditioning temperature set by the user by 1 ℃, the main electric control device controls the corresponding air-conditioning water inlet electromagnetic valve to be closed;
when the electric control device of the fan coil is closed, the main electric control device controls the closing of the corresponding air conditioner water inlet electromagnetic valve;
in the third step of the heat supply operation method, when the winter variable frequency control is continuously carried out, the main electric control device respectively carries out winter constant temperature adjustment on each air-conditioning room;
in winter constant temperature regulation, a main electric control device reads the actual temperature in an air-conditioning room and the air-conditioning temperature set by a user through a fan coil electric control device, and when the actual temperature in the air-conditioning room is equal to the air-conditioning temperature set by the user, the main electric control device controls a corresponding air-conditioning water inlet electromagnetic valve to be in a half-open state; when the actual temperature in the air-conditioning room is less than or equal to the air-conditioning temperature set by the user and is 1.5 ℃, the main electric control device controls the corresponding air-conditioning water inlet electromagnetic valve to be in a full-open state; when the actual temperature in the air-conditioning room is more than or equal to the air-conditioning temperature set by the user and is 1.5 ℃, the main electric control device controls the corresponding air-conditioning water inlet electromagnetic valve to be closed; when the electric control device of the fan coil is closed, the main electric control device controls the closing of the corresponding air conditioner water inlet electromagnetic valve.
4. A method of operating a building cooling and heating system according to claim 1, wherein: the main electric control device is connected with a display, and continuously monitors the temperature in each return water branch pipe through a return water branch pipe pressure sensor; the main electric control device calculates the pressure difference between each water return branch pipe and the water return main pipe and calculates the average value of the pressure difference between each water return branch pipe and the water return main pipe;
when the pressure difference between one water return branch pipe and the water return main pipe is more than or equal to two times of the average value of the pressure difference, the water return branch pipe is indicated to be damaged, and the main electric control device displays alarm information on a display to prompt a worker to maintain.
5. A method of operating a building cooling and heating system according to claim 1, wherein: a first water return electromagnetic valve is arranged on a first water return pipeline at the outlet of the first water return pump, and a second water return electromagnetic valve is arranged on a second water return pipeline at the outlet of the second water return pump; the first water return electromagnetic valve and the second water return electromagnetic valve are respectively connected with the main electric control device;
in the first step of the cooling operation method, the main electric control device opens the first water return electromagnetic valve and closes the second water return electromagnetic valve to prevent the return water from entering the second heat exchange box.
6. A method of operating a building cooling and heating system according to claim 1, wherein: in the first step of the heat supply operation method, the main electric control device opens the second water return electromagnetic valve and closes the first water return electromagnetic valve to prevent the return water from entering the first heat exchange box.
CN201810323790.5A 2018-04-12 2018-04-12 Operation method of building cooling and heating system Expired - Fee Related CN108592185B (en)

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