Summary of the invention
The utility model proposes a kind of full air energy-saving air-conditioning system, purpose is the comprehensive utilization by new wind introducing, heat recovery and VFC, reaches the purpose that reduces the air-conditioning system operation energy consumption.
The full air energy-saving air-conditioning system of the utility model design comprises: new wind entrance, heat exchanging segment, heat supply or cooling section, air supply section, air return section, exhaustion section and exhaust outlet, be provided with pressure fan in the described air supply section and be connected with ajutage, described air return section is connected with backwind tube, be provided with return fan in the air return section, wherein, described heat exchanging segment adopts full recuperation of heat runner heat exchanger, on new wind and air exhaust passage by-passing valve is set respectively, and outdoor new wind and indoor exhaust wind are carried out heat exchange within it.
Described new wind entrance and air return section are equipped with air cleaner.
Between heat exchanging segment and heat supply or cooling section, be provided with mixing section, behind the outdoor new wind process heat exchanging segment (2), mix at this mixing section through by-passing valve (18) with the indoor return air of part that return fan (8) is introduced, mix the back air and after heat supply or the processing of cooling section, send into indoor by pressure fan.
Described new wind entrance and exhaust outlet adopt the electric multiblade control valve.
Described pressure fan and return fan adopt frequency conversion fan.
Compared with prior art, the utlity model has following advantage:
1, air quality control: according to indoor carbon dioxide concentration detected value, control new valve area automatically, increase or the minimizing resh air requirement, indoor carbon dioxide concentration is maintained in the scope of sanitary standard regulation.New wind, return air and the interlock of air draft air-valve are to keep indoor static pressure constant.
2, utilize indoor-outdoor air enthalpy difference control resh air requirement: change according to the indoor-outdoor air enthalpy difference, adjust new return air ratio, heating load, cooling amount etc., utilize outdoor new wind cooling to greatest extent.
3, room temperature VFC: change according to indoor dry-bulb temperature, preferential control is sent, the return fan rotating speed, the automatic adjustment system air output.
4, air-conditioning system is established the runner total-heat exchanger, when summer and winter operation operating mode, saves the novel wind energy consumption.
The specific embodiment
Below in conjunction with drawings and Examples the utility model is described in detail.
As shown in Figure 1, the full air energy-saving air-conditioning system that the utility model proposes comprises: new wind entrance 1, heat exchanging segment 2, heat supply or cooling section 4, air supply section 6, air return section 7, exhaustion section 9 and exhaust outlet 10.Be provided with pressure fan 5 in the air supply section 6 and be connected with ajutage 11, air return section 7 is connected with backwind tube 12, is provided with return fan 8 in the air return section.New wind entrance 1 and air return section 7 are equipped with air cleaner 17.
Heat exchanging segment 2 adopts full recuperation of heat runner heat exchanger, make outdoor new wind and indoor exhaust wind carry out heat exchange within it, and on the new wind in this section and the air exhaust passage by-passing valve is set respectively, both can have reduced runner area (cost), air quantity demand in the time of can satisfying the operation of brand-new wind again.
Between heat exchanging segment 2 and heat supply or cooling section 4, be provided with mixing section 3, outdoor new wind is through behind the heat exchanging segment 2, mix at this mixing section through by-passing valve 18 with the indoor return air of part that return fan 8 is introduced, mix the back air and after heat supply or 4 processing of cooling section, send into indoor by pressure fan 5.
New wind entrance 1 and exhaust outlet 10 adopt the electric multiblade control valve.Pressure fan 5 and return fan 8 adopt frequency conversion fan.
The work of the full air energy-saving air-conditioning system that the utility model proposes is as follows:
Outdoor new wind carries out heat exchange through new wind entrance 1 → thick, medium effeciency filter 17 → runner heat exchanging segment 2(with air draft) → mixing section 3(mixes with the indoor return air of a part of bypass) → heat supply or cooling section 4(freeze or heat treated) → blower section 6 → ajutage 11 → send into indoor.
Indoor return air → return air duct 12 → medium air filtration section 17 → return fan 8 → mixing section 3 (wherein a part through mixes with new wind after the heat exchange behind the by-passing valve behind cold and hot processing, pressure fan, send into indoor) → another part enters runner heat exchange segment 2 and outdoor new air heat-exchange → drain into outdoor.
The full air energy-saving air-conditioning system operational mode that the utility model proposes comprises:
1, air quality control:
Annual each period flow of the people of commercial building changes greatly, and the air-conditioning system resh air requirement need be adjusted according to actual needs.This system can control new valve area automatically according to the indoor gas concentration lwevel detected value that arranges, and increases or the minimizing resh air requirement, and indoor carbon dioxide concentration is maintained in the scope of sanitary standard regulation; The air quantity ratio is adjusted in new wind motor-driven valve (MV1), air draft motor-driven valve (MV2) and the interlock of mixing section bypass motor-driven valve (MV3) three valves, to keep indoor static pressure constant.
2, give, the return fan VFC
Personnel load each period variation greatly in the commercial building, and conventional method adopts according to the electric control valve on indoor dry-bulb temperature control table cold (heating) segment pipe, regulates cold (heat) discharge, satisfies the indoor temperature requirement; Remove in addition, the native system air-conditioning send, return fan arranges frequency converter, can be according to indoor dry-bulb temperature by the Frequency Converter Control rotation speed of fan, and the regulating system air quantity satisfies the indoor temperature requirement; Two kinds of methods, it is preferential to recommend air quantity to regulate.
3, utilize enthalpy difference control resh air requirement:
Whole year operation air-conditioning system Various Seasonal, period are utilized the enthalpy difference control method, and the outdoor air energy is fully used.
(1) cooling condition 1: when newly the wind enthalpy is greater than the return air enthalpy, take minimum fresh air requirmente, reduce the refrigeration machine load.Should control minimum resh air requirement or given minimum fresh air requirmente according to indoor carbon dioxide concentration under this operating mode, to guarantee the requirement of sanitary condition.
(2) cooling condition 2: when newly the wind enthalpy is less than the return air enthalpy, take maximum resh air requirement, take full advantage of natural cooling source, to alleviate the refrigeration machine load.
(3) cooling condition 3: when new wind was brought cold into and equaled indoor load, the refrigeration machine load is zero, and was out of service.
(4) cooling condition 4: new wind enthalpy further reduces, and can utilize this moment a part of return air to mix with new wind, can reach ventilation state.Can not start refrigeration machine this moment, relies on natural cooling source to keep cooling condition fully.
The full air energy-saving air-conditioning system that the utility model proposes adopts the combined type design of two blower fans, band heat-recovery section, cooperate give, behind the exhaust blower frequency converter, relevant temperature, hygrosensor, be easy to realize annual energy-conservation automatic control, can realize multinomial Energy Saving Control measures such as Temperature and Humidity Control, VFC, enthalpy control, new wind demand control.
Above-described embodiment only is used for the explanation specific embodiment of the present utility model.Should be pointed out that for the person of ordinary skill of the art, under the prerequisite that does not break away from the utility model design, can also make some distortion and variation, these distortion and variation all should belong to protection domain of the present utility model.