Enthalpy difference method metering system for heating energy-saving amount

Abstract

The invention discloses an enthalpy difference method metering system for heating energy saving amount. The enthalpy difference method metering system comprises an intelligent temperature controller, a large-caliber heat meter, a concentrator and a cloud end or a server. The metering method comprises the following steps: inputting a room temperature maximum limit temperature tx; reading a set temperature tjis, and judging if tjis is less than tx; if yes, the relative humidity phi jix is read, the saturation pressure Pbhxi of water vapor is obtained by looking up a table, and the moisture content phi jix is calculated; calculating an enthalpy value hjix at tx; then, the enthalpy value hjid at the time of tjis is calculated; the mass mjix dry air of the dry air in the wet air of the room is calculated; the mjix dry air, the hjix and the hjid are substituted into a formula to calculate the energy saving amount qji of the room; the behavior energy-saving amount Aj of the jth user is calculated according to a formula; subtracting the energy consumption of the report period from the energy reference of the base period to obtain the overall total energy saving amount Qz; and the economic benefit of the total energy-saving quantity Qz is distributed to the heat users according to the rules of the technical energy-saving quantity and the behavior energy-saving quantity.

Description

Technical Field

[0001] The invention relates to a heating energy saving amount metering system, in particular to a system for measuring energy saving amount using an enthalpy difference method, and belongs to the field of building energy saving. Background Art

[0002] At present, winter heating in the north consumes a lot of energy, but the waste is serious, mainly because the room temperature is too high, and heating is continued even when no one is indoors, wasting a lot of energy. There is generally no room temperature control device in central heating rooms. Even if some rooms have thermostats, the thermostats can be adjusted by anyone at will without restrictions, so there is no energy saving effect.

[0003] In particular, energy saving in heating is not linked to the economic benefits of energy saving, so people have no motivation to save energy.

[0004] Because heat is transferable, more than 20% of the heat supplied to a household is transferred to adjacent heat users, and traditional heat metering methods have certain shortcomings.

[0005] Glossary

[0006] Base period: The period of time before the implementation of energy performance improvement measures, used to compare and determine energy savings.

[0007] Reporting period: The period of time after the implementation of energy performance improvement measures used to compare and determine energy savings.

[0008] Energy benchmark: Used as a quantitative reference for comparing energy performance, an energy benchmark reflects energy use over a specific time period.

[0009] The above explanations are taken from the "Technical General Rules for Contract Energy Management" GB / T24915-2020) and the "Calculation Method for Energy Savings per Energy-Using Unit" GB / T13234-2018

[0010] Technical energy saving: energy saving from reducing the heating temperature from the overheated room temperature to the maximum limit temperature of the room temperature. The maximum limit temperature cannot be adjusted at will by the heat user, but can only be adjusted by the management personnel using technical methods.

[0011] Behavioral energy saving: The energy saving amount when the heat user manually adjusts the room temperature downward from the maximum limit temperature. Behavioral energy saving is a further energy saving based on technical energy saving. Its energy saving amount is random, so it needs to be measured separately for each room. Summary of the invention

[0012] In order to overcome the above shortcomings, the present invention provides a heating energy saving measurement system. The present invention is characterized in that it provides an Internet of Things intelligent energy saving control system, and heating energy saving measurement software is added to the intelligent network room temperature control system to measure the heating energy saving.

[0013] The heating energy saving metering system consists of two parts: one is to measure the energy saving of the room temperature overheating part through technical means, namely "technical energy saving"; the other is to measure the energy saving of people actively adjusting the room temperature, including the energy saving of the indoor heating part when no one turns off the heat, namely "behavioral energy saving".

[0014] In order to solve the above problems, the present invention is achieved through the following technical solutions:

[0015] The enthalpy difference method measurement system for heating energy saving includes an intelligent thermostat, a large-caliber heat meter, a concentrator, a cloud or server, and an electric valve; the intelligent thermostat includes a central processing unit, a hardware or software clock, a temperature sensor, a relative humidity sensor, and a wireless or wired transmission module; the large-caliber heat meter is installed at the thermal entrance of the building, the intelligent thermostat is installed in the room of the heat user, and the electric valve is connected to the intelligent thermostat; the concentrator is installed in the building; the intelligent thermostats in all rooms are connected to the concentrator by wireless or wired means; the concentrator is connected to the cloud or server; the large-caliber heat meter is connected to the cloud or server;

[0016] The energy saving enthalpy difference method measurement system measures the energy saving of heating according to the following steps:

[0017] 1. First, install a large-caliber heat meter at the heat entrance of the building. The heating energy E measured by the large-caliber heat meter during a heating period (i.e., the base period) without installing other energy-saving equipment is read into the cloud or server as the "energy benchmark" for the overall base period of all heat users; the "energy benchmark E" is stored in the memory;

[0018] 2. Calculate the volume of each room of the heat user

[0019] (1) Input the length, width, and height of the i-th room of the j-th user into the cloud (106) or server (107);

[0020] (2) Calculate the volume V of the i-th room of the j-th user ji ;

[0021] (3) The volume V of the i-th room of the j-th user ji Store in respective memory;

[0022] 3. Start energy-saving equipment

[0023] An intelligent thermostat and an electric valve are installed in each heat user's room; a concentrator is installed in the building, and all the intelligent thermostats in the room are connected to the concentrator wirelessly; the concentrator is connected to the cloud or server; and the large-caliber heat meter is connected to the cloud or server.

[0024] 4. The energy saving enthalpy difference method measurement system measures the energy saving of heating according to the following steps:

[0025] (1) Input the maximum limit temperature of the heating room t x ;

[0026] (2) Enter the date and time when the user does not use heat;

[0027] (3) The cloud or server reads the set temperature t of the smart thermostat of the i-th room of the j-th user every θ time. jis ;

[0028] (4) If the set temperature t jis Less than the maximum limit temperature t x The energy saving q of the i-th room of the j-th user is calculated as follows: ji :

[0029] ① Calculate the maximum limit temperature t of the i-th room of the j-th heat user x and the relative humidity of the room's moist air φ jix Enthalpy value h jix

[0030] a. The cloud or server reads the relative humidity φ of the humid air in the i-th room of the j-th thermal user jix

[0031] b. Calculate the humidity content of the humid air in the i-th room of the j-th heat user d ji

[0032] According to the "Saturated Air State Parameter Table", the maximum limit temperature t x The saturated pressure of water vapor is P bhxi The relative humidity of the room and the relative humidity sensor measure the relative humidity of the wet air φ jix , substitute into the formula to calculate the moisture content d ji

[0033] c. Calculate the maximum limit temperature t of the i-th room of the j-th heat user x and the humidity content of the room's moist air ji Enthalpy value h jix

[0034] ② Calculate the current indoor temperature t of the wet air in the i-th room of the j-th user jid Enthalpy value h jid ;

[0035] a. The cloud or server reads the current indoor temperature t measured by the smart thermostat of the jth user's i-th room jid ;

[0036] b. Calculate the current indoor temperature t of the wet air in the i-th room of the j-th user jid Enthalpy value hjid ;

[0037] ③ Calculate the energy saving q of the jth user's i-th room ji

[0038] a. Calculate the mass m of dry air in the wet air of the jth user's i-th room jix干空气

[0039] b. V ji ,t jix ,φ jix , P bhxi Substitute into the formula to calculate m jix干空气

[0040] c. m jix干空气 、h jix 、h jid Substitute into the formula to calculate the energy saving q ji

[0041] (5) The energy saving q ji Accumulate to the accumulator A of the jth hot user j ;

[0042] (6) Calculate the sum of the energy savings of all n heat users, Q2:

[0043] 5. After the heating period ends, the cloud or server reads the total energy consumption of the large-caliber heat meter for the entire heating user during the reporting period Q3:

[0044] 6. The total energy saving of the whole heat user is Q3, which is the energy benchmark Q1 minus the total energy consumption during the reporting period Q3. z ;

[0045] 7. Overall user energy saving Q z Subtract the overall thermal user behavior energy saving Q2 to get the overall technical energy saving Q s ;Technology energy saving Q s is the overall heat user of all rooms with a temperature above the maximum limit t x The superheated room temperature is reduced to the maximum limit temperature t x Energy saving;

[0046] 8. Technical energy saving Q s Allocate to each heat user according to their capacity;

[0047] (1) Calculate the volume V of the n rooms of the jth heat user j :

[0048] (2) Calculate the sum of all room volumes Vz of the total r heat users:

[0049] (3) Calculate the average energy saving per cubic meter of heat user’s technical energy saving q每立方米 :

[0050] (4) Calculate the technical energy saving q shared by the jth hot user s ;

[0051] 9. Total energy saving of the jth heat user

[0052] The total energy saving of the jth heat user is the sum of technical energy saving and behavioral energy saving q j ;

[0053] 10. Economic benefit Y of energy saving for the jth heat user j .

[0054] The beneficial effects of the present invention are:

[0055] 1. The enthalpy difference method for measuring energy saving solves the unreasonable charging phenomenon of traditional wall heat transfer measurement based on heating heat;

[0056] 2. Solved the problem of overheating of heating room temperature and saved a lot of energy;

[0057] 3. Solve the thermal imbalance phenomenon of heating near and far, hot and cold, hot above and cold below;

[0058] 4. For public buildings, such as office buildings, hospitals, schools, rental houses, etc., heating costs can be measured in each room to encourage users to actively adjust the room temperature to save energy;

[0059] 5. The enthalpy difference method of energy saving measurement does not require additional investment. It can be achieved by simply adding the enthalpy difference method computer software to the network room temperature control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 It is a hardware structure block diagram of the present invention;

[0061] Figure 2 It is a subroutine flow chart for calculating the energy saving of each room of a heat user by using the enthalpy difference method;

[0062] Figure 3 It is a flow chart of the program for calculating the overall energy saving and the energy saving of each heat user. DETAILED DESCRIPTION

[0063] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0064] See also Figure 1 , Figure 1 This is the hardware system structure diagram of the present invention

[0065] 1. First, a large-caliber heat meter 101 is installed at the heat entrance of the building. In a heating period, i.e., a base period, when no other energy-saving equipment is installed, the heating energy E measured by the large-caliber heat meter 101 is read into the cloud 106 as the "energy benchmark" of the base period for the entire heat user; the "energy benchmark E" is stored in the memory;

[0066] 2. Calculate the volume of each room of the heat user

[0067] (1) Input the length, width, and height of the i-th room of the j-th user into the cloud 106;

[0068] (2) Calculate the volume of the i-th room of the j-th user;

[0069] V ji =L ji ×W ji ×H ji

[0070] Where:

[0071] V ji ——The volume of the i-th room of the j-th user, m 3 ;

[0072] L ji ——The length of the i-th room of the j-th user, m;

[0073] W ji ——The width of the i-th room of the j-th user, m;

[0074] H ji ——The height of the i-th room of the j-th user, m.

[0075] The volume V of the i-th room of the j-th user ji Store in respective memory;

[0076] 3. Install an intelligent thermostat 103 and an electric valve 104 in each room of the heat user 105; the intelligent thermostat 103 includes a central processing unit, a hardware clock, a temperature sensor, a relative humidity sensor, and a wireless transmission module; the electric valve 104 is connected to the intelligent thermostat 103; the concentrator 102 is installed in the building; the intelligent thermostats 103 in all rooms are connected to the concentrator 102 by wireless; the concentrator 102 is connected to the cloud 106; the large-caliber heat meter 101 is connected to the cloud 106;

[0077] 4. The energy saving enthalpy difference method measurement system measures the energy saving of heating according to the following steps:

[0078] See also Figure 2

[0079] (1) Figure 2 Step 201, input the maximum limit temperature t of the heating room x ;

[0080] (2) Enter the date and time when the user does not use heat;

[0081] (3) Step 202: Every θ time, the cloud 106 reads the set temperature t of the i-th room of the j-th user of the smart thermostat 103. jis ;

[0082] (4) Step 203, if the set temperature t jis Less than the maximum limit temperature t x The energy saving q is calculated as follows: ji : Otherwise, step 209 returns;

[0083] ① Calculate the maximum limit temperature t of the i-th room of the j-th heat user x and the relative humidity of the room's moist air φ jix Enthalpy value h jix

[0084] Step 204,

[0085] a. The cloud reads the relative humidity φ of the humid air in the i-th room of the j-th thermal user jix

[0086] b. Calculate the humidity content of the humid air in the i-th room of the j-th heat user d ji

[0087] According to the "Saturated Air State Parameter Table", the maximum limit temperature t x The saturated pressure of water vapor is P bhxi The relative humidity of the room and the relative humidity sensor measure the relative humidity of the wet air φ jix , substitute into the formula:

[0088] d ji =622·φ jix ·P bhxi / (101325-φ jix ·P bhxi )

[0089] Where:

[0090] d ji ——Humidity content of humid air in the i-th room of the j-th user, g / kg (干空气) ;

[0091] φ jix ——Relative humidity of wet air in the i-th room of the j-th user, %;

[0092] P bhxi——The jth user’s i-th room is under the limit of maximum temperature t x The saturated pressure of water vapor in moist air at 1 sec, Pa;

[0093] 101325 is the atmospheric pressure, unit: Pa;

[0094] c. Calculate the mass m of dry air in the wet air of the jth user's i-th room jix干空气

[0095] V ji ,t jix ,φ jix , P bhxi Substitute into the formula to calculate m jix干空气

[0096] d. Step 205, calculate the maximum heating limit temperature t of the wet air in the i-th room of the j-th user jix Enthalpy value h jix

[0097] h jix =1.005·t jix +0.001 d ji ·(1.86·t jix +2501)

[0098] Where:

[0099] h jix ——The maximum limit temperature t of the heating room of the i-th room of the j-th user jix Hourly enthalpy of moist air, kJ / kg (干空气) ;

[0100] d ji ——Humidity content of humid air in the i-th room of the j-th user, g / kg (干空气) ;

[0101] t jix ——The maximum limit temperature of the room temperature of the i-th room of the j-th user, °C;

[0102] ② Step 206, calculate the current indoor temperature t of the humid air in the i-th room of the j-th user jid Enthalpy value h jid ;

[0103] a. The cloud reads the current indoor temperature t measured by the temperature sensor of the i-th room of the j-th user jid ;

[0104] b. Calculate the current indoor temperature t of the wet air in the i-th room of the j-th user jid Enthalpy value h jid ;

[0105] h jid =1.005·t jid +0.001 d ji (1.86·t jid +2501)

[0106] Where:

[0107] h jid ——Enthalpy of the current temperature of the humid air in the i-th room of the j-th user, kJ / kg (干空气) ;

[0108] d ji ——Humidity content of humid air in the i-th room of the j-th user, g / kg (干空气) ;

[0109] t jid ——The current humid air temperature of the i-th room of the j-th user, ℃;

[0110] ③ Step 207, calculate the energy saving of the jth user's i-th room

[0111] q ji =m jix干空气 ·(h jix -h jid )

[0112] Where:

[0113] q ji ——The energy saving of the behavior of the jth user in the i-th room in the time period θ, kJ;

[0114] m jix干空气 ——The mass of dry air in the wet air of the i-th room of the j-th user, kg (干空气) ;

[0115] h jix ——The jth user’s i room is at the maximum limit temperature t jix The enthalpy of moist air,

[0116] kJ / kg (干空气) ;

[0117] h jid ——The current indoor temperature t of the i-th room of the j-th user jid The enthalpy of moist air,

[0118] kJ / kg (干空气) ;

[0119] (5) Step 208: The behavior energy saving q ji Accumulated to the accumulator A of the jth hot user j middle.

[0120] See also Figure 3 , Figure 3 This is a flow chart of the program that calculates the overall energy savings and the energy savings for each heat user.

[0121] (6) Figure 3 Step 301, calculate the sum of the energy savings of the behaviors of all n heat users:

[0122]

[0123] Where:

[0124] Q2——the sum of energy savings of all n heat users, kJ;

[0125] A j ——The energy saving of the jth heat user’s behavior, kJ.

[0126] 6. Step 302: After the heating period ends, the cloud reads the total actual energy consumption Q3 of the large-caliber heat meter for the heating period, i.e., the reporting period, of the overall heat users:

[0127] 7. Step 303: The energy benchmark E minus Q3 is the total energy saving of the entire heat user Q Z ;

[0128] QZ=E-Q3

[0129] Where:

[0130] Q z ——Total heat users, kJ;

[0131] E——Energy benchmark of the base period, kJ;

[0132] Q3——the total actual energy consumption of heat users during the heating period, i.e. the reporting period, kJ;

[0133] 8. Step 304: Total energy saving of the user Q z Subtract the overall thermal user behavior energy saving Q2 to get the overall technical energy saving Q s , technical energy saving Q s is the overall heat user of all rooms with a temperature above the maximum limit t x The superheated room temperature is reduced to the maximum limit temperature t x Energy saving;

[0134] Q s =QZ-Q2

[0135] Where:

[0136] Q s ——technical energy saving of overall heat users, kJ;

[0137] Q z ——Total energy saving of overall heat users in the current period, kJ;

[0138] Q2 – overall thermal user behavior energy savings, kJ;

[0139] 9. Step 305, technical energy saving Q s Allocate to each heat user according to the heat user's volume; (1) Calculate the volume of all n rooms of the jth heat user:

[0140]

[0141] Where:

[0142] V j ——The sum of the room volumes of the jth heat user, m 3 ;

[0143] Vi——The volume of the i-th room of the j-th heat user, m 3 ;

[0144] (2) Calculate the sum of all room volumes Vz of the total r heat users:

[0145]

[0146] Where:

[0147] Vz——the sum of all room volumes of r heat users, m 3 ;

[0148] V j ——The sum of the room volumes of the jth heat user, m 3 ;

[0149] (3) Calculate the average energy saving per cubic meter of heat user’s technical energy saving q 每立方米 :

[0150] q 每立方米 =Q s / V z

[0151] Where:

[0152] q 每立方米 ——Technical energy saving per cubic meter of heat users, kj / m 3 ;

[0153] Q s ——technical energy saving of overall heat users, kJ;

[0154] V z ——The sum of the room volumes of the total r heat users, m3 ;

[0155] (4) Calculate the technical energy saving q shared by the jth hot user s :

[0156] q s =q 每立方米 ×V j

[0157] Where:

[0158] q s ——Technical energy saving shared by the jth hot user, kJ;

[0159] q 每立方米 ——Average energy saving per cubic meter of heat user, kJ / m 3 ;

[0160] V j ——The sum of the room volumes of the jth heat user, m 3 ;

[0161] (5) Step 306: Total energy saving of the jth heat user q j The sum of the household's technical energy saving and behavioral energy saving

[0162] q j =q s +A j

[0163] Where:

[0164] q j ——The total energy saving of the jth heat user is the sum of the technical energy saving and behavioral energy saving of the household, kJ;

[0165] q s ——Technical energy saving shared by the jth hot user, kJ;

[0166] A j ——behavior energy saving of the jth heat user, kJ;

[0167] (6) Economic benefits of energy saving for the jth heat user

[0168] Y j =B×q j

[0169] Where:

[0170] Y j ——The amount of energy saving shared by the jth heat user, RMB;

[0171] B——unit price of heating fee, yuan / kJ;

[0172] q j ——Total energy saving of the jth heat user, kJ.

Claims

1. A heating energy saving measurement system using an enthalpy difference method, comprising an intelligent thermostat (103), a large-caliber heat meter (101), a concentrator (102), a cloud (106) or a server (107), and an electric valve (104); the intelligent thermostat (103) comprises a central processing unit, a hardware or software clock, a temperature sensor, a relative humidity sensor, and a wireless or wired transmission module; the large-caliber heat meter (101) is installed at the thermal entrance of a building, the intelligent thermostat (103) is installed in a room of a heat user, and the electric valve (104) is connected to the intelligent thermostat (103); the concentrator (102) is installed in the building; the intelligent thermostats (103) in all rooms are connected to the concentrator (102) by wireless or wired means; the concentrator (102) is connected to the cloud (106) or the server (107); the large-caliber heat meter (101) is connected to the cloud (106) or the server (107); It is characterized in that The energy saving enthalpy difference method measurement system measures the energy saving of heating according to the following steps: 1) First, a large-caliber heat meter (101) is installed at the heat inlet of the building. During a heating period, i.e., a base period, when no other energy-saving equipment is installed, the heating energy E measured by the large-caliber heat meter (101) is read into the cloud (106) or server (107) as the "energy benchmark" of the overall base period for all heat users; the "energy benchmark E" is stored in the memory; 2) Calculate the volume of each room of the heat user (1) Input the length, width, and height of the i-th room of the j-th user into the cloud (106) or server (107); (2) Calculate the volume V of the i-th room of the j-th user ji ; (3) The volume V of the i-th room of the j-th user ji Store in respective memory; 3) Start energy-saving equipment An intelligent thermostat (103) and an electric valve (104) are installed in each heat user's room; a concentrator (102) is installed in the building, and all intelligent thermostats (103) in the room are connected to the concentrator (102) via wireless means; the concentrator (102) is connected to the cloud (106) or the server (107); and the large-caliber heat meter (101) is connected to the cloud (106) or the server (107). 4) The energy saving enthalpy difference method measurement system measures the energy saving of heating according to the following steps: (1) Input the maximum limit temperature of the heating room t x ; (2) Enter the date and time when the user does not use heat; (3) The cloud (106) or server (107) reads the set temperature t of the i-th room smart thermostat (103) of the j-th user every θ time interval. jis ; (4) If the set temperature t jis Less than the maximum limit temperature t x The energy saving q of the i-th room of the j-th user is calculated as follows: ji : ① Calculate the maximum limit temperature t of the i-th room of the j-th heat user x and the relative humidity of the room's moist air φ jix Enthalpy value h jix a. The cloud (106) or server (107) reads the relative humidity φ of the wet air in the i-th room of the j-th thermal user jix b. Calculate the humidity content of the humid air in the i-th room of the j-th heat user d ji According to the "Saturated Air State Parameter Table", the maximum limit temperature t x The saturated pressure of water vapor is P bhxi The relative humidity of the room and the relative humidity sensor measure the relative humidity of the wet air φ jix , substitute into the formula to calculate the moisture content d ji c. Calculate the maximum limit temperature t of the i-th room of the j-th heat user x and the humidity content of the room's moist air ji Enthalpy value h jix ② Calculate the current indoor temperature t of the wet air in the i-th room of the j-th user jid Enthalpy value h jid ; a. The cloud (106) or server (107) reads the current indoor temperature t measured by the intelligent thermostat (103) of the i-th room of the j-th user. jid ; b. Calculate the current indoor temperature t of the wet air in the i-th room of the j-th user jid Enthalpy value h jid ; ③ Calculate the energy saving q of the jth user's i-th room ji a. Calculate the mass m of dry air in the wet air of the jth user's i-th room jix干空气 b. V ji ,t jix ,φ jix , P bhxi Substitute into the formula to calculate m jix干空气 c. m jix干空气 、h jix 、h jid Substitute into the formula to calculate the energy saving q ji (5) The energy saving q ji Accumulate to the accumulator A of the jth hot user j ; (6) Calculate the sum of the energy savings of all n heat users, Q2: 5) After the heating period ends, the cloud (106) or server (107) reads the total energy consumption Q3 of the entire heating user during the reporting period from the large-caliber heat meter (101): 6) The total energy saving of the whole heat user is Q3, which is the energy benchmark Q1 minus the total energy consumption during the reporting period Q3. z ; 7) Overall user energy saving Q z Subtract the overall thermal user behavior energy saving Q2 to get the overall technical energy saving Q s ;Technology energy saving Q s is the overall heat user of all rooms with a temperature above the maximum limit t x The superheated room temperature is reduced to the maximum limit temperature t x Energy saving; 8)Technology energy saving Q s Allocate to each heat user according to their capacity; (1) Calculate the volume V of the n rooms of the jth heat user j : (2) Calculate the sum of all room volumes Vz of the total r heat users: (3) Calculate the average energy saving per cubic meter of heat user’s technical energy saving q 每立方米 : (4) Calculate the technical energy saving q shared by the jth hot user s ; 9) Total energy saving of the jth heat user The total energy saving of the jth heat user is the sum of technical energy saving and behavioral energy saving q j ; 10) The economic benefit of energy saving for the jth heat user is Y j .

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