CN100557535C - A kind of control method of retracting type roof heat-baffling device - Google Patents

Abstract

The invention discloses a kind of control method of retracting type roof heat-baffling device, utilize this control method can be according to the radiant heat flux direction between indoor thermal environment demand and roofing and the indoor relative building enclosure, to the expansion that is arranged in parallel in the covering heat shading apparatus under the roofing with pack up automatically and control, reach the purpose of improving indoor thermal environment.The control method of roof covering heat shading apparatus proposed by the invention, effect of heat insulation is remarkable, can effectively reduce by the indoor radiations heat energy of roofing layer turnover; And by control covering heat shading apparatus expansion and pack up, farthest improve indoor thermal environment, improve indoor thermal comfort, be applicable to multiple roofing forms such as pitched roof (the furred ceiling layer is arranged or do not have the furred ceiling layer), flat roof deck (the furred ceiling layer is arranged or do not have the furred ceiling layer), double-layer ventilation roofing.

Description

A kind of control method of retracting type roof heat-baffling device

Technical field

The present invention relates to a kind of heat insulation control method, specifically is a kind of control method of retracting type roof heat-baffling device.

Background technology

Improving the heat-proof quality of roofing, be even more important to reducing summer and entering the indoor solar radiation heat of buildings by roofing, is important measures that improve indoor thermal environment.Roof heat insulation heat-insulating technique commonly used at present; be on the structural sheet on roof, guarantee for a person given by a shopkeeper's temperature thermofin repaves the roofing that water barrier and protective seam are constructed; but this roof structure is under summer comparatively hot weather conditions, and its heat-proof quality can not guarantee the indoor good thermal environment that reaches fully.

The heat-insulating capability in summer that utilizes the highly reflective material to improve roofing is a kind of new technical measures, be generally used for the double-layer ventilation roofing, attach one deck highly reflective material at upper strata roofing lower surface, can reduce by roofing in summer and to be delivered to indoor solar radiation heat, but because of material layer is fixed, stopped on the contrary in the solar radiation heat inlet chamber when the low outdoor solar radiation of indoor temperature is strong in the winter time, failed effectively to utilize this heat to improve indoor temperature.

Summary of the invention

Defective at above-mentioned prior art, the invention provides a kind of control method of retracting type roof heat-baffling device, can be according to the radiant heat flux direction between indoor thermal environment demand and roofing and the indoor relative building enclosure to the expansion that is arranged on the covering heat shading apparatus under the roofing with pack up automatically and control, control reaches the purpose of improving indoor thermal environment by the indoor radiations heat energy of roofing turnover.

In order to realize the foregoing invention purpose, the technical scheme that the present invention takes is: a kind of control method of retracting type roof heat-baffling device, detect in real time the temperature on relative building enclosure surface under roofing lower surface and the roofing, judge the direction of heat flow between the relative building enclosure under roofing and the roofing by the temperature contrast that relatively draws; Again detected indoor temperature and the reference value that sets in advance are relatively judged the indoor thermal environment situation, control the expansion of covering heat shading apparatus or pack up in conjunction with above-mentioned two factors.

The present invention reaches the purpose of improving bad border of indoor heat by being controlled at the covering heat shading apparatus that is provided with between the indoor building enclosure under building roofing and the roofing, covering heat shading apparatus is arranged under roofing and the roofing between the indoor relative building enclosure, deployablely also can pack up, parallel with the roofing upper surface and at a distance of certain distance during expansion, covering heat shading apparatus is made by the low-launch-rate highly reflective material, have less thickness, under roofing, form and hide thermosphere.For buildings, when the hot solar radiation of summer climate is strong, had a strong impact on indoor thermal environment by the solar radiation heat in the building roofing inlet chamber, weakening principle according to radiation heat transfer, arrange covering heat shading apparatus summer under roofing, can effectively reduce the radiations heat energy in the inlet chamber, improve indoor thermal environment; Outdoor in the winter time solar radiation is stronger, and room temperature is when low, is a kind of favorable factor by the solar radiation heat in the roofing inlet chamber for improving indoor thermal environment, and then on the contrary weakened by solar radiation heat roofing inlet chamber in as still arranging covering heat shading apparatus under roofing this moment; Except the typical case of solar radiation in summer in winter when strong, under climate conditions such as night, transition season, rainy weather, under roofing and the roofing between the indoor building enclosure if any temperature contrast, still have radiations heat energy indoor by roofing turnover, play favourable or adverse influence to indoor thermal environment.

By the control method of retracting type roof heat-baffling device of the present invention, can effectively improve the architecture indoor thermal environment, reduce room conditioning or heating energy consumption, be a kind of efficiently, have a roof insulation control method of adaptivity.This method is applicable to roofing forms such as pitched roof (the furred ceiling layer is arranged or do not have the furred ceiling layer), flat roof deck (the furred ceiling layer is arranged or do not have the furred ceiling layer), double-layer ventilation roofing.

Description of drawings

Fig. 1 is the insulation board schematic diagram;

Fig. 2 is a control system structural drawing of realizing control method of the present invention;

Fig. 3 is control principle figure of the present invention;

Fig. 4 is a control flow chart described in the embodiment;

In the accompanying drawings:

1-upper surface 2-lower surface 3-insulation board

Relative building enclosure surface temperature sensor under the 201-roofing underlaying surface temperature sensor 202-roofing

203-indoor air temperature sensor 204-controller

The 205-covering heat shading apparatus

Embodiment

With reference to Fig. 1, covering heat shading apparatus is realized by following principle the effect that slackens of the radiation heat transfer between the indoor building enclosure relative under roofing and the roofing:

Ultimate principle according to radiation heat transfer in the thermal conduction study:, can adopt the method for between two radiating surfaces, arranging insulation board in order to reduce the radiation heat transfer between the two articles surface.So-called insulation board is meant to be arranged between two radiation heat transfer surfaces to weaken the thin plate of radiation heat transfer.

Below be to arrange between the parallel flat that an insulation board with low-launch-rate reduces the principle of work that two radiation heat transfers between the parallel flat are example explanation insulation board, supposes the emissivity of two flat boards ₁=ε ₂=0.8, the emissivity of insulation board ₃=0.2, then:

q ₁₃＝ε ₁₃(E _b1-E _b3) (1)

q ₃₂＝ε ₃₂(E _b3-E _b2) (2)

Q in the formula _1,3And q _3,2Be respectively the radiation heat transfer heat flow density of 1 pair of insulation board 3 of upper surface and 3 pairs of lower surfaces 2 of insulation board.System's emissivity of 3,2 two systems in surface 1,3 and surface is respectively:

${\mathrm{\ϵ}}_{13}=\frac{1}{\frac{1}{{\mathrm{\ϵ}}_1}+\frac{1}{{\mathrm{\ϵ}}_3}-1}=\frac{1}{\frac{1}{0.8}+\frac{1}{0.2}-1}=0.1905$

${\mathrm{\ϵ}}_{32}=\frac{1}{\frac{1}{{\mathrm{\ϵ}}_3}+\frac{1}{{\mathrm{\ϵ}}_2}-1}=\frac{1}{\frac{1}{0.2}+\frac{1}{0.8}-1}=0.1905$

Two system's emissivity equate that therefore ε is arranged ₁₃=ε ₃₂=ε _s=0.1905.

Under hot steady state conditions, q ₁₃=q ₃₂=q ₁₂, formula (1) and (2) addition are got:

${\mathrm{<figure-callout\; id="1"\; label="q"\; filenames="C20081003133600091.png,C20081003133600101.png"\; state="\{\{state\}\}">\; <figure-callout\; id="2"\; label="q"\; filenames="C20081003133600091.png"\; state="\{\{state\}\}">q</figure-callout>\; </figure-callout>}}_{\mathrm{1,2}}=\frac{1}{2}{\mathrm{\&epsiv;}}_s(E_{b1}-E_{b2})=0.09525(E_{b1}-E_{b2})$

When not arranging insulation board, the radiation heat transfer heat flow density of 1 pair of lower surface 2 of upper surface is:

${\mathrm{<figure-callout\; id="1"\; label="q"\; filenames="C20081003133600091.png,C20081003133600101.png"\; state="\{\{state\}\}">\; <figure-callout\; id="2"\; label="q"\; filenames="C20081003133600091.png"\; state="\{\{state\}\}">q</figure-callout>\; </figure-callout>}}_{\mathrm{1,2}}={\mathrm{\&epsiv;}}_{12}(E_{b1}-E_{b2})$

$=\frac{1}{\frac{1}{{\mathrm{\&epsiv;}}_1}+\frac{1}{{\mathrm{\&epsiv;}}_2}-1}(E_{b1}-E_{b2})$

$=\frac{1}{\frac{1}{0.8}+\frac{1}{0.8}-1}(E_{b1}-E_{b2})$

$=0.6667(E_{b1}-E_{b2})$

Relatively have or not the radiation heat transfer heat flow density of arranging insulation board, show that the radiation heat transfer of arranging 1 pair of surface 2, insulation board rear surface is 1/7 when not arranging insulation board, radiation heat transfer reduces significantly.For making the effect that weakens radiation heat transfer more remarkable, in fact can adopt the lower material of emissivity to make insulation board.As being to arrange between two parallel surfaces of 0.8 that an emissivity is 0.05 insulation board in emissivity, then can make radiations heat energy be reduced to original 1/27.

Referring to Fig. 2, roofing underlaying surface temperature sensor 201 is arranged in the lower surface of the superiors' roofing, under the roofing relative building enclosure surface temperature sensor 202 for different roofing arranged in form in different positions: for the flat roof deck or the pitched roof of no furred ceiling layer, then be arranged in indoor ground surface under the roofing; For flat roof deck that the furred ceiling layer is arranged or pitched roof, then be arranged in the upper surface of furred ceiling layer; For the double-layer ventilation roofing, then be arranged in the upper surface of lower floor's roofing; Indoor air temperature sensor 203 is placed on indoor.205 of covering heat shading apparatus are arranged in parallel in a distance, the superiors roofing below, and controller 204 expansion of covering heat shading apparatus 205 according to the signal controlling of temperature sensor 201,202 and 203 and packed up.

Referring to Fig. 3, at first set two different indoor high temperature reference value TH and low temperature reference value TL, utilize temperature sensor continuously to measure the temperature of three measuring points then: relative building enclosure surface temperature T2 under room air temperature T0, roofing underlaying surface temperature T1, the roofing, and be converted into electric signal and pass to controller 204.Indoor air temperature T0 is compared with two indoor high temperature reference value TH, low temperature reference value TL, in order to judge that indoor temperature is too high, it is low or moderate to cross, again relative building enclosure surface temperature T2 under roofing underlaying surface temperature T1 and the roofing is compared, judge the direction of transfer of the radiation heat transfer between this moment of two surfaces, when roofing underlaying surface temperature T1 is higher than the (T1＞T2) of relative building enclosure surface temperature T2 under the roofing, illustrate that then radiation heat transfer is to pass to indoor from roofing, otherwise on the contrary then.When the radiation heat transfer direction is to pass when indoor from roofing, as this moment indoor temperature higher, then keep covering heat shading apparatus 205 to be in deployed condition by controller 204 action, as this moment indoor temperature lower, then keep covering heat shading apparatus 205 to be in collapsed state by controller 204 actions; When the radiation heat transfer direction is from indoor biography during to roofing, as this moment indoor temperature higher, then keep covering heat shading apparatus to be in collapsed state by controller 204 action, as this moment indoor temperature lower, then keep covering heat shading apparatus 205 to be in deployed condition by controller 204 actions; As this moment indoor temperature moderate, it is constant then to keep covering heat shading apparatus to keep current state.

Fig. 4 is a covering heat shading apparatus control method process flow diagram of the present invention.

After covering heat shading apparatus, temperature sensor and controller deploy, set room air high temperature reference value TH and low temperature reference value TL by controller 204, and high temperature reference value TH＞low temperature reference value TL.(step S1, TH＞TL, TH and TL are set at 27 ℃ and 20 ℃ respectively).By relative building enclosure surface temperature T2, indoor air temperature T0 (step S2) under temperature sensor 201,202,203 METHOD FOR CONTINUOUS DETERMINATION roofing underlaying surface temperature T1, the roofing, and send controller 204 to.In controller 204, indoor air temperature T0 and high temperature reference value TH and low temperature reference value TL are compared (step S3):

1) as the indoor air temperature T0 that records during greater than high temperature reference value TH, illustrate indoor air temperature higher need the cooling, in controller 204, relative building enclosure surface temperature T2 under roofing underlaying surface temperature T1 and the roofing is compared (step S4), and the comparative result according to T1 and T2 carries out following operation afterwards:

1. more than high M ℃ the time (M is set to 1 ℃),, make covering heat shading apparatus 205 reach deployed condition (step S6) than T2 as T1 by controller 204 actions.

2. when T1 lower more than M ℃ the time (M is set to 1 ℃) than T2, by controller 204 actions, make covering heat shading apparatus 205 reach collapsed state (step S8).

3. when T2-M≤T1≤T2+M (M is set to 1 ℃), controller 204 is failure to actuate, and keeps covering heat shading apparatus 205 to keep current state (S7).

2) as the indoor air temperature T0 that records during less than low temperature reference value TL, illustrate that indoor air temperature on the low side needs heat up, in controller 204, relative building enclosure surface temperature T2 under roofing underlaying surface temperature T1 and the roofing is compared (step S5), and the comparative result according to T1 and T2 carries out following operation afterwards:

1. more than high M ℃ the time (M is set to 1 ℃),, make covering heat shading apparatus 205 reach collapsed state than T2 as T1 by controller 204 actions.(step S8)

2. when T1 lower more than M ℃ the time (M is set to 1 ℃) than T2, by controller 204 actions, make covering heat shading apparatus 205 reach deployed condition (step S6).

3. when T2-M≤T1≤T2+M (M is set to 1 ℃), controller 204 is failure to actuate, and keeps covering heat shading apparatus 205 to keep current state (S7).

3) when the indoor air temperature T0 that records between high temperature reference value TH and low temperature TL, promptly during TL≤T0≤TH, illustrate that indoor air temperature is moderate, controller 204 is failure to actuate, and makes covering heat shading apparatus 205 keep current state (S7).

By controller 204 corresponding actions, make after covering heat shading apparatus 205 completing steps 6,7 or 8 operations, enter step 2 once more, then continuous coverage temperature T 0, T1 and T2.

Claims (3)

1, a kind of control method of retracting type roof heat-baffling device, it is characterized in that, detect in real time the temperature on relative building enclosure surface under roofing lower surface and the roofing, judge the direction of heat flow between the relative building enclosure under roofing and the roofing by the temperature contrast that relatively draws; Again detected indoor temperature and the reference value that sets in advance are relatively judged the indoor thermal environment situation, control the expansion of covering heat shading apparatus or pack up in conjunction with above-mentioned two factors; Controlling covering heat shading apparatus in conjunction with described direction of heat flow and thermal environment situation comprises the steps:

1), more relative building enclosure surface temperature T2 under roofing underlaying surface temperature T1 and the roofing is compared as the indoor air temperature T0 that records during greater than indoor high temperature reference value TH:

1. when T1 than T2 more than high M ℃ the time, the control covering heat shading apparatus launches;

2. when T1 lower more than M ℃ the time than T2, the control covering heat shading apparatus is packed up;

3. when T2-M≤T1≤T2+M, make covering heat shading apparatus keep current state by controller;

Wherein M is the operation limit for avoiding frequent operation to set;

2), more relative building enclosure surface temperature T2 under roofing underlaying surface temperature T1 and the roofing is compared as the indoor air temperature T0 that records during less than low temperature reference value TL:

1. when T1 than T2 more than high M ℃ the time, the control covering heat shading apparatus is packed up;

2. when T1 lower more than M ℃ the time than T2, the control covering heat shading apparatus launches;

3. when T2-M≤T1≤T2+M, the control covering heat shading apparatus is kept current state;

3) when the indoor air temperature T0 that records between high temperature reference value TH and low temperature reference value TL, promptly during TL≤T0≤TH, the control covering heat shading apparatus is kept current state.

2. according to the control method of the described retracting type roof heat-baffling device of claim 1, it is characterized in that the indoor air temperature high temperature reference value TH of setting is 27 ℃, low temperature reference value TL is 20 ℃.

3. according to the control method of the described retracting type roof heat-baffling device of claim 1, it is characterized in that described M is 1 ℃.

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