CN1651880A - Heat metering method for open-loop heating systems - Google Patents

Abstract

The present invention relates to a method for measuring heat quantity provided for user in an open-loop heating system. Said method is characterized by that on the water-supplying riser pipe of open-loop pipeline heating structure a flow measuring point is set, in the front end and outlet of every radiator of said water-supplying riser pipe a temperature measuring point is set respectively, so that they can be formed into a series-connected temperature flow combined arrangement mode; the measured parameters of flow measuring point are identical to three measured parameters required for heating quantity calculation mode of calorimeter, said invention utilizes the summation of heating quantities of all the water-supplying riser pipes in the user so as to obtain the heat amount provided for user.

Description

The hot measuration method of open loop heating system

(1) technical field under:

The present invention relates to a kind of hot measuration method of open loop heating system.

(2) background technology

The heating pipeline structure of existing dwelling house has two kinds, and a kind of is the heating structure of closed loop pipeline, and another kind is the heating structure of open loop pipeline.The heating structure characteristics of closed loop pipeline are: each user's heating supplies, water return pipeline constitutes an independent closed loop pipeline, promptly has only the import of a heating hot-water line and the outlet of a heating hot-water line.The heating structure characteristics of open loop pipeline are: each user's heating supplies, water return pipeline all has the import of two or more heating hot-water line and two or more heating hot-water lines outlets are arranged, thus, the heating residential building of open loop pipeline need be provided with many heating and supplying water standpipes side by side, every standpipe will run through the user by each floor, and connect with the indoor convector of user, each user is indoor to have many water supply standpipes to pass through.

The assay method of existing household based heat metering has two kinds, and a kind of is the calorimeter assay method, and another kind is the Heat distribution meter assay method.Narrate and analyze this two kinds of methods below.

(1) calorimeter assay method

Calorimeter is made up of a flowmeter and two temperature sensors.Flowmeter is used for measuring the hot water flow of feed pipe, and two temperature sensors are used for measuring the supply water temperature and the return water temperature of feed pipe respectively.The calorimeter assay method is by measuring hot water flow and for, these three parameters of return water temperature, and passes through $Q_i={\∫G}_i\left(t\right)\·C\·(T_i^I-T_i^E)\·\mathrm{dt}$ Determine user's heating load.In the formula, Q _iBe i user's heating load, G _iFor entering i user's feed pipe hot water flow, t is i user's a heating time, and C is a hot water specific heat, T _i ^IAnd T _i ^EBe respectively the feed pipe hot water temperature who enters and leave i user.

(2) Heat distribution meter determination method

Heat distribution meter is made up of two temperature sensors, is used for measuring the average surface temperature and the indoor air temperature of user's heating radiator respectively.Heat distribution meter assay method average surface temperature and these two parameters of indoor air temperature by measuring user's heating radiator are determined the heating load of user's heating radiator by following formula, and the heating load of these all heating radiators of user is added altogether, promptly $Q_i=\underset{k}{\mathrm{\Σ}}{\mathrm{\α}}_{i,k}\·F_{i,k}\·(T_{i,k}^w-T_{i,k}^n)\·t_{i,k}$

In the formula, Q _iBe i user's heating load, α _{I, k}And F _{I, k}Be respectively the surface film thermal conductance and the surface area of i user k heating radiator, T _{I, k} ^wAnd T _{I, k} ⁿBe respectively the indoor air temperature at i user k spreader surface medial temperature and k heating radiator place, t _{I, k}Heating duration for i user k heating radiator.

Measure user's heating load by the calorimeter assay method, its advantage is: its measuring principle and heating load computing formula are simple and direct, directly perceived and stable, but its defective is: it exists harsh application conditions restriction, promptly requiring user's heating structure must be the closed loop pipeline, and major part is the open loop pipeline in the existing heating residential housing, does not satisfy this condition.

Measure user's heating load by the Heat distribution meter assay method, its advantage is: it is applicable to any heating structure, but its defective is: measuring principle and heating load computing formula complexity, the surface film thermal conductance that wherein influences the heating radiator of heating load calculating is difficult to accurately with stably determine, so the Heat distribution meter assay method can not be accurately and the heating load of stably measuring the user, this has greatly limited the practicality of Heat distribution meter.

(3) summary of the invention

For overcoming existing calorimeter assay method and the existing technological deficiency of Heat distribution meter assay method: promptly the calorimeter assay method can not be applicable to that the heating structure of open loop pipeline and Heat distribution meter assay method can not stablize and the heating load of accurately measuring the user, the present invention proposes a kind of hot measuration method of open loop heating system.

The technical solution adopted in the present invention is: the calorimeter assay method is combined with the Heat distribution meter assay method, that is: use for reference the structure thought of Heat distribution meter assay method, simultaneously adopt the measuring principle of calorimeter and the heating load that the heating load computing formula is determined the user again, concrete grammar is: arrange a flow measuring point on the water supply standpipe of open loop pipeline heating structure; Be furnished with temperature point at the front end of the each household heating radiator of this water supply standpipe and exit that should the water supply standpipe, make it to form tandem temperature flow combined arranging mode: the location parameter of every adjacent two temperature points adds the location parameter of flow measuring point, three location parameters required with calorimeter heating load account form are identical, by heating load summation, promptly obtain user's heating load to all water supply standpipes among the user.Its computing method are $Q_i=\underset{k}{\mathrm{\Σ}}\∫G_{i,k}\left(t\right)\·C\·(T_{i,k}^I-T_{i+1,k}^I)\·\mathrm{dt}$

In the formula, Q _iBe i user's heating load, G _{I, k}Be the heating hot water flow through i user k water supply standpipe, t is i user's a heating duration, and C is a hot water specific heat, (T _{I, k} ^I-T _{I+1, k} ^I) be that the water supply and the return water temperature of i user k water supply standpipe is poor.

The method that the present invention proposes, the calorimeter assay method is combined with the Heat distribution meter assay method, promptly use for reference the structure thought of Heat distribution meter assay method, adopt the measuring principle of calorimeter and the heating load that the heating load computing formula is determined the user again simultaneously, formed tandem heat metering mode.Method proposed by the invention and the metering system of setting up in this way, can be implemented in to adopt in the residential housing of open loop pipeline heating structure and stablely carry out the heat metering of heating building branch family, the heat metering of heating building branch family is had positive facilitation with calorimeter assay method accurately.

(4) description of drawings:

Accompanying drawing 1 is the structural representation of the hot measuration method of open loop heating system.Wherein:

1. water supply standpipe 1 2. water supply standpipes 2 3. water supply standpipes 3 4. flow measuring points 5. temperature points

6. heating radiator 7. users 8. return pipes 9. feed pipes

(5) embodiment:

Now 1 couple of the present invention is further described in conjunction with the accompanying drawings:

Present embodiment is the hot measuration method of an open loop pipeline heating structure.

Present embodiment is five floors of an open loop pipeline heating structure, adopted last confession formula heating system next time, be that feed pipe 9 is laid on upstairs, return pipe 8 is laid on downstairs, the water supply standpipe is connected with return pipe 8 with feed pipe 9, water (flow) direction in the water supply standpipe is from top to bottom, and every water supply standpipe runs through every layer of resident family.Present embodiment has three rooms three convectors 6 to be arranged in it by five users 7 (these five users live in respectively one deck to five layer), each user, and each user is indoor to have passed through three water supply standpipes and be respectively 1, the 2 and 3 heating metering zones of forming.Wherein: on water supply standpipe 1, arranged six temperature points and a flow measuring point, the first five temperature point is arranged in each user's the place that enters successively, and the 6th temperature point is arranged in ground floor user's the place of leaving, and the flow measuring point also is arranged in this place; On water supply standpipe 2, six temperature points and a flow measuring point have been arranged equally, the first five temperature point is arranged in each user's the place that enters successively, and the 6th temperature point is arranged in ground floor user's the place of leaving, and the flow measuring point is arranged in second layer user's the place that enters; On water supply standpipe 3, six temperature points and a flow measuring point have been arranged too, the first five temperature point is arranged in each user's the place that enters successively, and the 6th temperature point is arranged in ground floor user's the place of leaving, and the flow measuring point is arranged in layer 5 user's the place that enters.

In one section heating duration, real time temperature parameter and each the flow measurement measured flow real-time parameter measured according to each temperature point, by $Q_i=\underset{k}{\mathrm{\Σ}}{\∫G}_{i,k}\left(t\right)\·C\·(T_{i,k}^I-T_{i+1,k}^I)\·\mathrm{dt}$ Determine each user's heating load.

In the formula, Q _iBe i user's heating load, i=1 here, 2,3,4,5, wherein i=1 is that layer 5 user, i=2 are that the 4th layer of user, i=3 are that the 3rd layer of user, i=4 are that second layer user, i=5 are the user of ground floor, G _{I, k}Be heating hot water flow through i user k water supply standpipe, k=3 here, t is i user's a heating duration, C is a hot water specific heat, T _{I, k} ^IBe the heating hot water temperature that i user k water supply standpipe enters place's measuring point, T _{I+1, k} ^IBe the heating hot water temperature that i+1 user k water supply standpipe enters place's measuring point, when i+1=6, expression water supply standpipe leaves the measuring point at place the ground floor user.

Claims (2)

1. the hot measuration method of an open loop heating system is characterized in that: go up at the water supply standpipe (1,2,3) of open loop pipeline heating structure and arrange a flow measuring point (4); Be furnished with temperature point (5) at the front end of the each household heating radiator (6) of this water supply standpipe and exit that should the water supply standpipe.

2. the hot measuration method of open loop heating system according to claim 1 is characterized in that the heating load computing method are

$Q_i=\underset{k}{\mathrm{\Σ}}{\∫G}_{i,k}\left(t\right)\·C\·(T_{i,k}^I-T_{i+1,k}^I)\·\mathrm{dt}$

In the formula, Q _iBe i user's heating load, G _{I, k}Be the heating hot water flow through i user k water supply standpipe, t is i user's a heating duration, and C is a hot water specific heat, (T _{I, k} ^I-T _{I+1, k} ^I) be the water supply of i user k water supply standpipe and the temperature difference of backwater.

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