The more than heat of aircrew of some project pneumatics reclaims use example, arrive from theory actual deduction, close. . .

Compressor of air of fuel injection screw is in moving process, electric energy changeover is mechanical energy, mechanical energy compresses air, air is compressed by intense maximum pressure, temperature rises suddenly, meanwhile, the high speed of mechanical screw rotates to also chafe calorific. High temperature compresses air to come loose the miscella that heat and the quantity of heat that attrition place produces pass pneumatics opportunity / airframe of pneumatics of gas steam eduction. This part high temperature is oily / the 3/4 that the quantity of heat of gas air current is equivalent to empty press power input, its temperature is in normally 80 ℃ (winter) to 100 ℃ (summerly fall) , run the requirement of temperature to reach a machine, these heat energy are gone to by the platoon before compressing air to enter pipeline system in atmosphere, borrow namely by pneumatics machine medicinal powder the temperature that hot system will come to achieve a machine to move asks [1] , otherwise the machine can quit movement. In company of production of timber of some PVC plastic pipe, employee dormitory needs a large number of wholesome life hot water, use pneumatics machine more than heat reclaims will replace report to heat, can reduce a large number of electric energy not only, managing cost, still can improve the moving environment of pneumatics machine, prolong the service life of pneumatics aircraft equipment, the later period that reduces pneumatics chance effectively is safeguarded and upkeep cost [1] .

One, pneumatics machine heat reclaims to be calculated theoretically in air in compressed8 process, assume compressed8 air is ideal gas, and be wait for process of entropy heat insulation, criterion power Wad is the heat insulation waiting for entropy of compressor [2] :

In type: The power of heat insulation waiting for entropy that Wad is compressor (KW) ; The inlet pressure that Ps is compressor (press absolutely, KPa) ; The exhaust pressure that Pd is compressor (press absolutely, KPa) ; K is the index waiting for entropy of gas be compressioned, the entropy index such as airy is 1.4; The real volume discharge that Qv is compressor (M3/s) . The basis is formulary 1, below standard atmosphere, the air temperature with inspiratory compressor is 20 ℃ , the air temperature of eduction is 80 ℃ , compress the air of 1m3/s to 8.5bar (gauge pressure) , power Wad is the entropy heat insulation such as the theory of its compressor:

In this process, the Q of quantity of heat that compresses air place to take away is:

Can get:

By afore-mentioned computation the result can be seen, 22.3% what what power consumes in compressing the quantity of heat that air place takes away to occupy whole heat insulation to reduce a process only, the quantity of heat that exceeds 3/4 is gone to by the platoon in atmosphere, among them only very small one part comes loose with radiation hot means platoon is gone to in atmosphere, the quantity of heat that remain can undertake reclaiming using.

2, if Cheng Tu shows 1 times,the heat that pneumatics machine heat exchanges principle pneumatics machine has exchanged: From inside atmosphere inspiratory air and engine oil press what high temperature arises after shrinking to compress oil gas mixture inside rotor, temperature is 80-95 ℃ about, enter oil gas segregator next, after oil gas is detached, compress gas to enter aftercooler to undertake cooling, enter each to use through conduit compress air to use gas site. And high temperature lube enters heat exchanger and cold water to undertake heating up exchange, high temperature enters compressor screw afresh after lube is cooling. If lube oil is lukewarm exorbitant still, enter system of condenser of pneumatics engine crude oil to undertake cooling, oily Wen Da arrives after the requirement reentrance pneumatics machine. Increase heat to reclaim after the system, not only all performance that do not affect former pneumatics engine, and can drop the temperature of pneumatics machine whole, carry high yield tolerance. Temperature and produce tolerance to become inverse ratio concern: Air eduction temperature every rise 1 ℃ , produce tolerance to drop 0.05% ; Rise 10 ℃ drop 0.5% ; Carry high yield tolerance accordingly conversely [3] . Increase heat to reclaim the use time that the system still reduces aftercooler cooling fan, have certain section report effect, lengthen machine and bad news material to use (like case of oil gas segregator, lube, engine oil) time, economic thinking maintains a variety of profit such as charge.

Graph heat of 1 pneumatics machine exchanges process principle to pursue

3, more than heat reclaims principle and technological process are in company of production of timber of some PVC plastic pipe, according to craft production uses a requirement, set 4 in all water-cooled machine of pneumatics of fuel injection screw. Among them 3 160kW decide heat of the buy inside frequency band to reclaim the water-cooling pneumatics machine of device (commonly used) , the water-cooling pneumatics chance that frequency conversion of a 160kW does not take heat to reclaim (reserve) . The circular water that frequency conversion does not carry the empty press that heat reclaims to use housetop refrigeration tower undertakes cooling. The empty press that heat of calm frequency band reclaims offers life hot water to be mixed to the dining room change shifts building. When preparation hot water, open circular water pump and water pump of loop of life hot water, when the temperature in cistern of life hot water, fluid when achieving set to be worth, shut heat to reclaim systematic valve and hot loop water pump, system of open refrigeration tower, use cooling water to undertake cooling. Of life warm water system and system of housetop refrigeration tower start have transition through dynamoelectric valve. Pneumatics machine more than heat reclaims if the graph is shown 2 times,systematic principle pursues.

Graph 2 pneumatics machine more than heat reclaims if systematic principle graph pursues show 2 times, the water of pass in and out that roofing refrigeration tower uses when pneumatics aircrew works at ordinary times undertakes cooling. When needing preparation life hot water, use pneumatics machine more than heat reclaims replace report to heat supply of preparation hot water changes shifts building. When pneumatics aircrew uses cooling tower to cool, valve A and valve B are shut, valve C and valve D are opened. Group of press of high above in the sky uses heat to reclaim when preparation hot water, valve A and valve B are opened, valve C and valve D are shut. When the water in circular cistern Wen Da arrives when set temperature, lukewarm accuse valve A to be shut automatically, shut circular water pump and valve B at the same time, valve C and valve D are opened, changeover becomes pattern of cooling tower refrigeration. The water in cistern of the loop in the graph under certain water level when, the ball cock in cistern can be opened automatically, and to the affusion in cistern; When prep above when certain water level, ball cock is shut, automatic cut off the water supply. 4, design computation and energy-saving benefit analysis work by turns the building adds up to 420 people, among them 30 rooms are double world, 90 rooms are 4 worlds, add up to 120 rooms, volume of his daily water of hot water of highest daily expense undertakes designing computation by 80L/d [5] . Everyday early, evening times two classes supply hot water, every working hours is 8 hours, everyday water supply two, every supply time to be 1 hour, a day of hot water supplies time to be 2 hours in all. Circular hot water is 60/50 ℃ for backwater temperature, tap water presses 5 ℃ computation into water temperature. Dormitory building everyday Q of hot power of total cost of G of gross of life hot water and hot water is respectively:

The cubage of box of life hot water is 10m3, the hot water inside cistern heats by time of blame water supply, inside water supply time, when the hot water inside cistern gives out entirely, need additional hot water is:

The hour heat consumption inside water supply time is: Water of T of Δ of water of Cp of peak of Q peak =G / Δ T peak

The hot water inside cistern is in time of blame water supply (in all 14 hours) inside heat, the hot water inside cistern is round-the-clock the sky that be put two, namely every time time of hot water preparation is 7 hours, the hour heat consumption inside time of hot water preparation is:

This project uses the water-cooling pneumatics machine of 3 160kW, wait for an element considering the heat exchange efficiency that changes efficiency, heat exchanger, the more than heat of every pneumatics machine answers effects to lead the 65% computation that press general power, the air of more than hot Q that place of machine of pneumatics of water-cooling of 160 KW of only station produces is:

The more than hot Q that pneumatics opportunity arises is in all:

Q always is more than Q peak and Q at ordinary times, no matter be added at ordinary times,life water supply heats when water supply accordingly, more than heat can satisfy pneumatics machine the quantity of heat that place of life hot water needs, can use directly heat life hot water. Change shifts the building heats everyday the heat consumption that place of life hot water needs is W=6190060.8kJ/d=1719.46(kW · H)/d, want 1720 degrees of report everyday namely. Project seat does not have natural gas origin, and investment of solar energy warm water system is large, tall to requirement of the temperature outdoor, still need to increase report in the winter complementary heat system, use report to heat commonly water heater. Of place industrial electric electrovalency is 1 yuan / (KW · H) , everyday but managing 1720 yuan, annual but managing 602 thousand yuan (workaday 350 days) . This pneumatics machine more than heat reclaims the system needs to buy coil of water pump, cistern, heat exchange, valve, conduit to wait only, fare of early days investment is low, later period does not have other moving charge, energy-saving effect is apparent, economic benefits is quite considerable also. 5, the premise that plastic product line tubal material is in this PVC not to change craft to produce issues verdict, reasonable use pneumatics machine more than heat, use life hot water through heat exchange coil the hot oil pneumatics machine is cooling, heat worker of supply of life hot water washs bath, reduced the investment of water heater of early days report, save much electric energy, later period is safeguarded and run cost low, bring enormous economic benefits. Still can improve the moving environment of pneumatics machine meanwhile, prolong the service life of pneumatics aircraft equipment, the later period that reduces pneumatics chance effectively is safeguarded and upkeep cost.