GB2604248A

GB2604248A - Heat pump device and heat pump water supply apparatus

Info

Publication number: GB2604248A
Application number: GB2204792.2A
Authority: GB
Inventors: Sato Yusuke; Hirosaki Hiroki
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2019-12-12
Filing date: 2019-12-12
Publication date: 2022-08-31
Anticipated expiration: 2039-12-12
Also published as: JPWO2021117184A1; JP7386895B2; GB202204792D0; GB2604248B; WO2021117184A1

Abstract

Provided is a heat pump device capable of suppressing a reduction in the heating capacity of a compressor when there is no need to reduce the heating capacity of the compressor when the temperature of the water flowing into a heat exchanger rises, due to the temperature of the water flowing out of the heat exchanger being relatively low.　The heat pump device (10) according to the present invention comprises: a compressor (11) that compresses a refrigerant; a heat exchanger (12) that exchanges heat between the refrigerant compressed by the compressor (11) and a heat medium; a pressure-reducing device (13) that reduces the pressure of the refrigerant; an evaporator (14) that exchanges heat between the refrigerant subjected to pressure reduction by the pressure-reducing device (13) and outside air; and a control device (15) that reduces the rotational speed of the compressor (11) when the value obtained from inflow temperature, which is the temperature of the heat medium flowing into the heat exchanger (12), and outflow temperature, which is the temperature of the heat medium flowing out of the heat exchanger, reaches a preset value.

Description

f DESCRIPTION]

[TII LE OF INVENTION]

HEAT PUMP DEVICE AND HEAT P WATER STJPPLYAPPARATIJS

[Technical Fie] [0001] The present invent n relates to a heat pump device and a heat pump water supply apparatus.

['Background Art]

[00U21 I() As a conventional heat pump water supi. ly apparaM, a.heat pump water supply apparatus is known that includes a 'rcfrigerant cIteulation circuit in which a co pressor. a refrigerant-t o-water heat exchanger a tle. thflkSoiC and an evaporator are seqientiidiy connected, and a hot water supply circuit in wthch.a hot water storage tank, a circulation pump and a r n to,ater heat exchanger are sequentially onnecte& and that pertoims a hot watet supply operation that stores v,rater heated by the retugeiant-to-watet heat exchanger in a hot water storage tank (set, for example. Patent Literature 1). [0003] In this heat pump water supply apparatu whe&i the temperature of the water flowing into the ref,rigerant-to-water heat exchanger iilcreases hen boiling the water in 20 the hot water storage tank is nearly completed during the hot water supply operation, an excessive increase i e discharge pressure of the compressor is suppressed by reducing the heating capacity of the compressor, [Citation List] [Patent Literatu 10004J [Patent Literature 11 Japanese Unexamined Patent Application, First Publication No. 2002310532

[Summary of In ntion]

[Technical Problem] [0005] In the ahoyetcribe4 heat pump water supply apparatus, the heating capacity Ithe comç.ressor is irduced.when. .thc..temperature if the water fiowinginto the refrigeraM-to Changer increases:: howevci. the dishcu.ge pressure of the compressor varies tie riding not only on the.te.iperatur. off the watertiow.ing into the lb rethgerant-to-water heatchange but also an the temperature of the water flowing out from the refrigerant-to-water heatexolianger In general, he lower the temperature of the water fl owing Out frrim the refrigerant-to tier. heat e x chan ger, the'ltrwer the discharge pressure' of the compressec [00061 Therefore, in the above-described heat pump water supply apparatus, when temperature Of the water flowing into the efrigerant-to-water heat exchanger increases, even in a case whe the temperature of the water flowing out from the refrigerant-towater heat exchanger is relatively lox and it is not necessary to reduce the heating capacity of the cornpressoi, the heating capacity of the compressor is reduced_ As a result there is a problem in that the operation time 'or generating the hot water storage amount required for the hot water storage tank is extended and the power consumption is iflcrea.sed [0007] The presetit invention has been made.to solve the above prohIeths., and an object thereof is to provide a heat pump device and supply apparatus which can suppress the reduction of the heatip.g'gaptcity ef the compressor when the temperature of the water flowing into the refrIgerant-towater heat exchanger InereaS S-and when the temperature of the water flowing out from the refr. anbto-w.ater heat changer is relatively low and his noi necesary.. to reduce the heating capacity of the compressor.

[Solution to Problem] [0008] ea] Pump de' iee accolding lo the Preset] ins, enlion includes: a press r COlflTC5St.a refilge a heat exchanger that changes heat between h ant co pre ed by the compressor and heat medium; a de ompr a decreases the pres nre of the refrigeraevaporator that exchanges heat between the refrigerant dec.. mpressed by the de n sor and the outside air and a CO 31 tr011eT that decre the rotation speed of the compressor when a value obtained by an inflow tempe he that is a temperature of the heat medium that flow o the heat exch ger.

and An outflow tempCratum that is a temperature of the heat medium that flows out of the heat changer readies a predetermined set value.

[0009] A heat pump water supply apparatus according to the prese ntio dudes: the lieat pump device described above; a hot water storage tank that stores water as the' heat medium; a circulation pump that sends the water in the hot water storage tank to the heat exchanger; an inflow temperature detector that detects the inflow temperature; and,an outflow temperature detector that detects the utflow 'temperature [Advantageous Effects of Invent° 10010] i'vecording to a heat pum at pump water supply apparatus according to the pre 01 WI'flap, the rotation. speed of the.cmptessor isdeereased when the values obtained from the inflow temperature and the outflow temperature reach the predetermined set values When the temperature increases, the outflow temperature vet)/ low, and it iS pOSSibie tosuppres ae reduction ing capacity the coinpmssor when it is not nëces.ary to reduce the heating capacity of the co This makes it possible to suppress an excessive increase in discharge pressure oithe cornpressor vvhile suppressing an increase in the operation time and an increase 11 the amount of 4r consumption during the hot WaLCI' supply ()potation.

[Brief Description of Drawings]

l0011I FIG. 1 configuration diagram sho ng a hesupply appara accordin..a a. first embodiment or Lhe rat nt nven Lion.

FIG. 2 is a cc ntrol. block diagram of the heat pump waterupply apparatus according to the first emhodiment of the present: invention.

FIG, 1 is a diagram showing an example of a hardware configuration of a processing circuit according to the first embodiment of the present invention.

FIG. 4 is a characteristic diagram showing the discharge presure of a compressor with respect to the inflow temperature of Water flowed into a heat exchanger in the heat pump water supply ap larattis according to the first embodiment of the present 20 invetitioa FIG. 5 is a flowchart showing the operatien of a controller according to thefirst embodiment of the present invention.

FIG. 6 is a diagram showb -a change in the rotation speed of the compressor the heat pump water supply apparatus according to the first embodiment of the present 5 invention.

S

FIG. 7 is charactednie djagrwj. showing the discharge pressure of the compressor with respect to the sum of the inflow temperature of water flowed into the heat exchanger and the outflow temperature of water flowed our from the heat exchanger in a eheat pump water supply apparatus according lode first embodiineat of the present invention.

FIG. 8 is a flowchart showing the operation of the controller according to a second embodiment of the present invention.

FIG 9 is a diagram showing a change in (he rotation speed of the is "'pressor in the heat pump water supply apparatus according tothesec.ond embodiment of the present *I()* invention.

FIG. 10 is a diagram showing a change at the rotation speed of a compressor in heat pump water supply apparatus according to a modified extutple of the seunid embodiment of the present invention.

FIG. 11 is a configurau n diagram showing a heat pump water supplyapparatus accordlne to a third en bodirnent of the pre t invention.

FIG. 12 is a control block diagram of a heat pump water supply apparatus according to a third embodiment of the present invention.

FIG. 13 is a flowchart showing the operation of the controller according to the third embodimentof the present invention.

HO. 14 is a flowchart showing the operation of the controller according to a modified example of the third embodiment of the prese nvention.

FIG. 15 is a flowchart showtngthe operation of the controller according to fourth embodiment of the present invention FIG, 16 is a data table stored in the controller acc rding to the fourth mbodi ent of the present tion.

[pest ttoll ofEmbodim ts1 [0012] Hereinafter, embodiments of the present invention will be described with refrrence tc the drawings. The:.e.iements comm.on t g ted by the sai-ne reference numerals, and duplicate des Pt will be orni [000] First Embodiment Thu configuration of die heat pump water supply apparatus 100 of the fast embodiment be described with reference to Fla I, FIG. 1 is a configuration diagram showing a heat pump water supply apparatus 100 according to the first embodiment of the present invention. As shown in FRI 1. the heat pump water supply apparatus 100.of the first embodiment includes a heat pwmp device 10 and a hot water storage device 20.

[0014] The heat pump deuce 10 includes a compressor 11 a heat exchanger 12, a decompressor 13, an evaporator 14, and a controller 15, Arefrigerant circuit. is formed by sequentkill) connecting the corn recsor 11, the hell exchanger 12, the decomprevsor 13, and the evaporator 14 by a efrigerant pipe 4 [0015] The compressor 11 compresses the refrigerant. The refrigerant may be, for example, carbon dioxide another refrigerant. The heat exchanger 12 heats the heat medium by exchanging heat between the high-pressure refrigerant compressed by the compressor 11 an& the liquid heat medium. As the heat medium, for example, water, an aqueous solution of calcium chloride, an aqueous solution of ethylen glycol, an aqueous solution of propylene gly alcohol or the like can be used, In the present embodiment, water used as a heatrne4him. [0016] The decompressor 13 decompresses the high-pressure refrigerant that tias passed through the he4t exchanger 1/ The decomPf mple, an ete tronicaliy controlled expansion take having a variable ope eree. The evaporator 14 is a heat exchanger that tchanges heat between the low-pressure refrigerant decompressed by the decompressor 1.3 and the outside air. The low-pressure refvige.rant.evaporatedin the evapot tor 14 is SLI eked into tilt. compressor! 1.

The hot wrterstorage device 20 include ht.water norae tank21, a circulation p nflow temperature detector 23, and an outflow te perature detector 24. A.htttkt. supply circuit is formed by sequentially connecting the hot water storage auk 21. thecireulation pump 22, and the heat exehauger 12 by thewatc pipe 25.

1.5 100183 The hot water storagetank 21 stores the water heated by the heat exchanger 12.

The circulation pump circulates the wate in the hot water storage tank 23 s as to send the water in the tower portion of the hot water storage tank 21 to the heat exctanget 12 and return the water heated by the heat exchanger 12 to the uppei portion in the hot r storage tank 21 As a result, in the not water storage tank 21, high-temperature water exists in the upper portion, and low1emperdture water exists toward the lower portion, The circulation pump 22 ic provided 'between the heat exchanger 12 in the er pipe 25 and the lower portion of the hot water storage tank 21. The circulation pump 22 may he provided between at exchanger 12 in the water pipe 25 and the upper portion of the hot water storage tank 21.

The inflow temper ire detector 23 is a sensor:that detects the inflow temperature, which is the temperature of the water flowing into the heat exchanger 12.

The inflow (eniperat:ure detector 23 is provided on int t *:ide of the heat exchanger 12 in the water pipe 25, that is, between the heat exchanger 12 and the lower portion of the hot water storage tank 21. The outflow temperature detector 24 is a sensor that detects the outflow temperature, which is the temperature of the water flowing out from the heat exelumget 12. The outflow temperature detector 2415 provided on the water outlet side I heat exchanger 12 in the water pipe 25, that is, between the heat exchanger 2 and the upper portion_ of the hotwater storage tank 21.

The hot water storage de.ce 20 further Mclude,: a niid.igviht 26. The first supply pipe 27 the fit st hot water supply pipe 28 and the second hot water supply pipe 29 are connected to the mixing valve 26.

100211 The first water supply pipe 27 connects: the water supply port 31 and the rnixi valve 26, In addition the second water supply pipe 30 branched from the first water supply pipe 27 is connected to the lower portion of the hot water storage tank 21, The first hot water supply pipe 28 connects the heat exchanger 12 in the water pipe 25, the upper portion of the hot water storage tank 21, and the mixing N' alve 26. '1'he second hot water supply pipe 29 wnnects the mixing valve 26 and the hot water supply port 32" 100221 The mixing I 26 adjusts the mixture ratio of the low -temperature flowing in from the first water supply pipe 27 and the high-ten peratute water flowing in from the first hot water supply pipe 28 to adjust the temperaturethehot water supplied to the uSer from the hot water SUPPLY Port 32. The.hOt Water supply Port 3. iS connected to a user terminal such as a bathtub, a. shower, a faucet, or a dishwasher. for ample.

[0023] xt, the onfiguration of the control system of the heal pump water supply apparatus 100 of the first embodiment will be described with re ence to FIG. 2, FIG. 2 is a control block diagram of the heat pump water supply apparatus 100 according to One first enboØ1inent,of the present invention.

[0024] *I()* As sho n in PIG. 2. the inflow temjrature infrrn.ation4etected by the inflow temperature detector 23 and the Outflo temperature information detected by the outflow temperature cletecior 24 are input the nmtroller 15. The controller 15 controls the operations of the compressor 11, the decompress 13, and the circulation pump 22 based on the input information.

[0025] The controller 1.5 is realized, for example as a processing circuit having a hard are corgi guration sho -In in FIG. 3. 171G 3 a diagram showi n exa.mple of the hardware configuration of the processing circuit according to the first embodiment of the present invention,. As shown in FIG 3, the controller 15 i:Pclttde1 for processor 41 which is a calculation unit and a memory 42 which is.a.storage unit When th...processor 41 executes the program stored in the memory 42 each function of the controflet 15 is realized. It should be noted that a plurality of processors and a plurality of inetnones maybe linked to realize each function of the controller 15 fri the first embodiment, the controller 15 t he heat p device 10 controis the operation enresation pump 22 however4 the hot water storage device may include a controller that controls the operation of the circulation jou such a case, the controller 15 included in the heat pump device 10 and the controller eluded in!lie hot waler storage device 20 may be linked to perform control, [0027] Next, the operation of the heat pump water supply apparatus 100 of thefirst embodiment during the hot water supply operation: vill he described. The hot water supply operation is an operation of storing the water hcated by Lhe heat pump device 10 in the hot water st ge tank 21 In the hot water supply operati n, he controller 15 *I()operates the compressor 11 and the circulation pump 22 As a. result, the high-temperature and high-pressure refrigerant compressed by the compressor 11 is sent to the heLit exchanger 12. In addition-the circulation pump 22 sends the low-temperature water in the lower portion of the hot v.4ter storage tank 21 to the heat exchanger Theo, the water heated by the heat exchanger 12 to have.a high temperature flows into the upper portion of the hot water storage tank P21, So that the high-temperature watet stored in the hot water storane tank 21. In addition, in the hot water supply operation. the con oiler 15 controls the o erttion of the circulation pump 22 so that the outflow temperature detected by the outfit° temperature detector 24 becomes a target ternperature..tohe set [0028] Here the relationship between the discharge pressure of the compressor 11 during the hot water supply operation,and the inflow temperature of water flowed into the heat exchanger. 12 and the utflo temperature of water flowed: out from the heat exchanger 12 will be described. FIG, 4 is a characteristic diagram showing the discharge pressure of the compressor 11 with.cespect to the inflow temperature of water flowed mto,e heat exchanger 12 in the eat pump water sippty apparatus 1.00. of f first enthodin ent of the present invention.

luft hot water supply operation, asihe highae.mperatvi-ntheris stored in upper portion of the hot water storage tank 21, the temperature of the water sent from lower portion of the hot water storage tank 21 to the heat exchanger 1 al 0 increases. As shown in FIG. 4, when the inflow temperature of water flowed into the heat exchanger 12 becomes high, the discharge pressm-e of the compressor 11 increases The pressure PI is the normal upi limit pressure of th compie 11, and in order to gua:natt1te0 the durability of the ccii pressor 11, it is operate the compressci 11 so that the dischar2e pressure is equal to or less than the normal upper limit pressure Pl.

[0030] Here, the discharge pressure of he compressor 11changes. rot only by the inflow temperature of water flowed into the heat exchimger 12 but alsc by the outflow temperature water flowed out from the heat exchanger 11 Generally, the lower the outflo th perature -incr. flow d out from the heat exchanger 12, the lower the discharge pressure of the compressor 11. In PIG. A as an example, the relationship between the discharge pressure of c onipiessoi 11 and the inflow temperature of water flowed into the heat exchanger 12 is shown at a time of a high outflow temperature which is a relatnely high temperature where the outflow temperature of water flowed out from the heat changer 12 is approximately 90°C and at a time of a low outflow temperature which a relatively low temperature where the outflow temperature of water flowed out froth the heat exchanger 12 is approximately 65 °C.

100311 As shOwn in FIG. 4. the inflow temperature, at which the discharge pressure of the compressor 11 becomes the normal upper limit pressure Pi. is lower at the high outflow temperature than at the low outflow temperature. Therefore hen controlling the (Tenth ri of the compressor II using the inflow temperature, order that the* inflow temperature is set to a high °Milo tethperatUte in order to prevent the discharge pressure if the compressor] 1 from exceedine the norrnal upper limit 'pressure PI regardless of the outflow temperature it is necessary to reduce the heating capacity of the compressor 11 before the discharge p ssure of the eoinpassor II g,e{g the inflow temperature T1 which is the 11011113.1 upper bruit pressiirePl.

*10* [0032] v in this case, es 1 ow temper4ure rfl is reached at the low outflow temperature, the heating capacay f [tie coropte=isix Ills reduced even though normal upper limit pressure PI has not been reached. Therefore, there problem in that the operation time for generating the required amount of hot water stored 15 in the hot water stora ink 21 is extended and the amount of POWCT consumption is eased.

[0033] There the pr'.eni intcnuIoui. not only the inflow temperatu ater floved into Me heat exchanger 12 but also the outflow temperature of water flowed out from the heat exchanger is used to control the operation of the ompressor 11. In particular, when the alue obtained from the ihfiow temperature of water flowed into the heat exchanger 12 and the outflow temperature of water flowed out from the heat exchanger 12 r aches a predetermined set value, the on speed of the compress 1 d:ecreaes In the present embodim t, when the same!' the inflow temperature of wa flowed into the heat exchanger 12 and the outflow temperature of water flowed out from the heat exchanger. 12 reaches a predetermined set value. the rotation speed of the compressor 11 decreases.

1003=11 The operatic) rdllerL5 of the first embodinietwillbe described with reference to FIG. 25. FIG 5 is a flowchart showing the operation of the ntroller 15 according to the first embodiment of the pres t ?cation.

1.0035j As shown in FIG. $. in Step SW the amiroller 15 determines whether or not a sum of the inflow temperature detected by the inflow temperature detector 23 andth.e I(). outflowternperture tétected by the*oudThw temperature dSedir 24 i equal to a predetermined set value 13 or more In the present embodiment. the sun of the infloks, temperature and the outfto temperature at which the-discharge pr ssu f the compressor 11 becomes the normal upper limit pressure P1 at the high outf law tempeintuic is set as the set value D. the set value T3 is stored in the controller 15. P0371

In Step SI, if the controller 15 determines that the sum of the inflow temperature and the outflow temperatureis less than the predetermined set value T3, the piece returns to Step 81.

[0038] In Step Si vhem the controller 15 determines that the sum of the inflow temp e and the. outflow temperatureis equal toor greaterthan the predetermined set value T3, the process proceeds to Step 52 and decreases the rotation speed of the compressor 11, FIG. 6 is a diagram showing changes in the rotation speed of the et. pressor 11 in the.heat pump: watetsupply apparatus 100 according to the first embodiment of the presenhinvention. . As shown in HU-. 6, when the sum of the lullow temperature and the outflow temperature reaches the predetermined set Value T3 the controller 15 decreases the rotation speed of the compressor 11 by a decrease amount ARI. The decrease amount AR1 in the rotation speed of the compressor II is stored in advance in the controller 1.5.

[00-101 HG. 7 is a h a ens diagram h ing the discharge pressure of the pressor us respect to the $u of the flow temperature of water flowed into the heat changer 12 and the outflow temperatur water flowed out from die heal exchanger12 in the heat pump water supply apparatus 100 according to the first embodiment of the present invention.

1.5 100411 As shown in ma 7, by setting the sum of the inflow temperature and the outflow temperature, at u hich the discharge pressure of the compressor 11 becomes the normal upper limit pressure ?I at the time of the high outflow temperature as the set value T3, the relationship between the inflow temperature T1 at the time of the high outflow temperature and the inflow temperature 12 at the time of the low ou temperature is Tl<T2. at which the sum of the inflow temperature and the outflow temperature is the set va1ue T3. Therefore, the hot water supply operation can he performed without reducing the heating capacity of the compressor 11 even in a range where the inflow temperature is higher at the time of a low outflow temperature than at the time of a high outfit° e perature.

According to the heat pump water supply apparatus 100 of the first embodiment, Inflow temperature is decreased because the rotation speed of the compressor 11 is decre a suinoltlie inflow tempera!, antl ot:U1ow temperature.

predeterr Med set value therefore, when the temperature ncreases, th temperature is relatively low. and it is possible th suppress the reduction of the heating capacity of the compressor]] when. it is not necessary to reduce the heating capacity of the compress. 11, A'.atestilt, it is possible to suppress an e*øesive:hicrease in the.disc.hargepressure of the compressor 11 while suppressing an increase in the operation 10lime and an n the r conumpticüi during the hot water supply oper In ThepresCill eni:hddtth.nt. thesum OIUir Inflow temperature, and the cum ow temperawhich, the discharge pressure. of thefl comptyssor 11 becomes the normal upper limit pressure P1 at..the high outflow perature is set as the et value T3; however, the siun ofthe...allow temperature and the outflow temperature a which the discharge pressure of the compressor 11 becomes the set pressure set as a value less than normal upper limit pressure P1 at the hig 11. Out ow ternperature 'may be...et ac the set value 13. As described above, the durability of die compressor 11 can be further roved by setting the set value 713 by using a 'value less than the not mal upper lirrtit prCSSUre. PI instead of the normal upper lima pressure PI.

[0044] Second Embodiment The heat pump water Apply apparatus 100 of the second embodiment will be described with referent'e toNGS. 8 and 9. FIG 8 is a flowchart showing the p)F1 of the controller 15 according to the second embodiment of the present inve.ntio,n 111 9 is a diagram showing changes in the rotation speed of the compressor 11 in the heat pump water supply apparatus 100 according to the second embodiment of the present invention_ [0045] In the fir tembdimurn, a sho),-,vri in Fla 6, when the umoftliejnfh tempera e and the utflow temperature reaches the predetermined set value T3. the rotation speed of the compressor 11 is decreased hy the decreage amount AR 1. On the other hand, in the secomf embddlntent, as shown in FIG, 9, a plurality of set values are set, and the rotation speed of the compressor 11 decreased each time th sun-t of the Inflow temperature and the outflow 'ternperature..reaçthes the plurality of set values.

[0046] In the.cond entodime I, the controller 1. VA-a fi set value T3A and a second set value T313 larger than the fiat set value T3A as set values. The first set value 13A and the second set value 1313 are stored in the c roller 15. Thew as shown in 14G. 9, when'thc'sum.oYtheiiiflow temperature and the outflow temperature reaches the predetermined first set value T3A, the rotation speed of the compressor 11 is decreased by)1 decrease amount ARIA, and when the sum reaches the set value T3B, the rotation speed of the compressor 11 js farther decreased by a decrease amount AR1B.

[0047] The) decrease amount in'the.rotation speed of the compressor 11 may be the same as ARIA and AR I B, d'the decrease amount in the rotation speed of the compressor II may he increased so as to satisfy AR1A<AR1R as the sum of the inflow-temperature and the outflow tempera es to 13A and T313.

f00481 The second embodiment is the same as the first embodiment cept that the operation of the controller 15 is 4iffrrent.,and iths thedesciption thereof wifi be omitted.

As situ iii kiQ.8-in Step S11, the controller 15 del sum the inflow temperature detected by the inflow tunperature detec r 23 and the outflow temperature detected by the outflow temperature detector 24 is the preset first set value r3 A or more.

[00501 The first set value T3A maybe. se um of the inflow temperature and the 10outflow icrnpertui he discharge pressure of thee pressorti. becomes the normal upper lirmt pressu P1 at the time of the high outflow Utmperaturc, or taking into cOnsideration the durability of the compress() 1, *may hit.set Ur the sum of the ifi flow :tempera h o hp which is a pressure set aaz value less than the normal upper titnit:pressure P1 [00511 In Step Si!vvhe h troller 15 determines that the sum of the inflow temperature and the outflow temperature is less than the predetermined first set alu 'r3A. the process returns to Step Si!. In Step S11. when the controller 15 determines that the S11111 of the inflow tenTheratu mid the outflow temperature is equal to or greater.

than the predetermined first set vain 13A, the process proceeds to Step SI 2, and the rotation speed of the compressor 11 is decreased by the decrease amount ARIA. [00521 When the.rotation speed of he compressor is.decreased in Step S12, tier Pr Pss proceeds to Step S13, and the contitllet 15 determines whether or not the sum of the inflow tempetature and the outtto tempetamie is the preset second set value JIB or more [0053] The second set cäiue T313 may be set as the sum of the inflow tempe ture and the outflow temperature aiw-hiehthe discharge pressure of the compressor 11 becomes the normal upper limit pressure PI at the high outflow temperature after the rotation speed of the compressor 11 is decreased by the decrease amount ARIA or may be set as the sum of the inflow temperature and the outflow temperature which is the set pressure set as a value less than the notmal upper limit pressure P1 in considuatmon of the durability of the compressor 11.

100541 In Step 813, when the:controikr 15 determines that the sum of the inflow temperature and the outflow temperature is less. than the predetermined second. sel value T3B. the process returns to Step S13, In Step S13. when the controller 15 detenniges that the sum of the inflow temperature and the outflow fempe 1-is equal to or greater than the predetermined second set value 1313 the process proceeds to Step 514. and the rotation speed of the compressor IL is decreased by the decrease amount AR1B, [0055] Also in the heat pump water supply.;pparaius 100 of the second erribodime in the first embodiment, the rotation speed of the compressor 11 is decreased Alien the sum of the inflow temperature and the outflow temperature reach predetermined set value. Therefore, when h inflow temperature increases the outflow-temperature is relatiels low, and it is possible to suppress the reduction of the heating capacity of the compressor 11 when it is nonecess&ry to reduce the heating-capacity of the C011aprtsSol As a result, it is possibie.to suppress an xcessive increase In ischarge pressure of the compressor 11 while suppressing an increase in the -operation time and an increase in the power cons Ption during the howatei. ippI.y oPeration.

[0056] In addition vince the controller 15 has a plurality of set values and the rotation speed of th.ompress Jr 11 is decreased each tin le the sum of the inflow temperat the outflow temperature reahes a plurality of predetermined set values, the hot water supply operation can be performed until the sum of the inflow temperature and the outflow temperature becomes a larger value while suj.j!ts.sing.an.excesive increase in One discharge pre sm of the compressor 11.

[0057] I() in.th&second embodiment,t values are e o that the rotation speed.o pressor 11 d ease 0 stePs: ho rvct, three or i ore set 'values may be set In addition, as shown in FIG. 10, the mullion speed of 11w compressor 11 maybe continuously decreased by setting a large number of set values.intervals. The operation of the controller 1.5 in such a case is the same as that of the flowchart of 1(1G. '8, and the rotation speed of the compressor II may be decreased every time They sum of the inflow temperature and the outflow temperature reaches a set value-set at narrow inte FIG. 10 is a diagram showing changes in the rotation speed of the compressor 1.1 In the heat PumP water supply aPParatus 100 of the modified example of the second e:mbodiment.cif the present invention. As shown in FIG. 10, after the sunrof the inflow temperature and the outflow temperature reaches the predetermined first set value T3A, the rotation speed o 'the compressor 11 increases as the sum of the inflo rature and the outflow temperature inc ases or.decteases continuQus1y. As.a it the hot water supply operation be performed until the stun of the inflow temperature and the outflOw temperature becomes a larger value while sup -ssing an exce crease the discharge pressure of the compressor 11.

Third Embodiment The configuration of the heat pump water supply apparatus 100 of the embodiment will be described with refereme to FIGS. 11 and 12. FIG. 11 is a configuration diagram sh ing.a.heat pump water supply apparatus 100 according to a third embodiment of the present invention FIG. 12 iS a control block. diagram Of the heati nip water supply apparatus 100 according tothe third embodiment of the present 1.0 invention.

AS how.n in FIG 11, in the heu. pump water supply apparatus 100 of the third embodiment, the heat pump devne 10 further includes an outside air-temperature detector 17 that.detects the outside air temperature. In the present embodiment. the outside werature detector 17 detects the temperature of the outside air before being corded by the evaporator 14. The ou de air-temperature detector 17 may be installed in another place as long a. can detect the outside air. temperature.

As shown in FIG 12, information he outside air temperature detected by the outside air-temperature detector 17 is further input to the controller 15. The controller is based on the inflow temperature info ation detected by the inflow temperature detector 3, the outfiowternperamre information detected by the outflow temperature detector 24, and the outside temperature information detected by the outside air-temperature detector 17. The operation of the compressor 11, the decompressor 13, and pump 22 are c.ntroltc.d.

In the third embodiment the.confiuration s the same as that of the first embodiment except that the heat pump water suppl% apparatus 100 further includes the outsid mperature detector 17 that detects the outside air lemperatu1-e,and.this the

description thereof will be omitted-

[00631 Next, the operation of The controller 15 of the third emhodi.ment.will be described with reference to FIG 13. FIG. 13 is a flowchart showing the operation of the controller 15 accordi.ngto the third ernbodi.mentof the present invention..

I() [0064] As sho in M. 13, in the third embodiment the opetatiou of the Step $3 is pet-fon-lied he:fote. t1ttep S1 of the first embodiment In Step 53, the on troller 1.5 sets he set value T3 ac,-ding the outside air temperature detected by the outsid tempe tre detector 17_ [0065] The set value T3 is stored in the controller 15 in association with the outside air temperature, In Step S3, the contmller 15 sets I eetdue Tt3 by reading the set value T3 corresponding the outside air temperature detected by the ont.i4e air-temperature detector 17 Here the harg pressure f the compressor 11 teiids to..Increase. as the outside air temperature Increases. therefore, the set vlue '1'3 is set to a smaller value as e outside air temperature becomes higher_ The set value T3 may be calculated by calculation using the outside air temperature.

[0066] When th t value T1 is set in 53, the controller 15 CeedS to Step S and deter whether not the sum of the inflow' temperature detected by the inflow mperature detector 23 and the outflow mpemture detected by the.cuttiow tewpentwe detector 24 is the preset set value of T3 or more. Since Steps -Si and 82 a e he same as th n the first mbodim t, the description thereof will be omitted.

[0067] Also in the heat pump water supply apparatus 100 of the third embodiment, as in the first embodiment the rotation speed of the compressor 11 is decreased when the sum cif the inflow temperature and the outflow temperature reaches a predetermined get value.

refore, when the inflow i-mperature increase he outflow temperature is relatis eTy and it Issible to suppress the reductioi cif the heating aP, I the compressor viten ot necess 'to reduce the he cityofthe compressor 11. As a Th lo 1 it is Possible to upps.anexcsjve increase in the discharge Pressure of the compressor 11 while utpprer,sing awnierease:fn.:opktatioitlithe: and an increase in power consumption during the hot water supply o [0068] In addition since the controller 15 sets the set value 'f3 according to the tside air temperature detected by the outside air-temperature detector 7. the heating capacity of the compressor II is reduced by using the set value 'Ti in consideration of the outside air temperature. As a result, the cozypressqr 11 can be controlled more accurately In particular, since the set value T3 is set to a s ller value s the outside ait temieratu becomes higher, it is possible to suppress an excessive increase in discharge pressure of the compressor 11 even when the outside air temperature is high. In addition, since the set value is set to a larger value as the outside air temperature is decreased, hen the outside air temperature is low, the sum the inflow temperature and the outflow temperature is increased while suppressing an vaessive increase in discharge rrrssure of 11. The hot w supply oNr on can be Performed until the value beccunas larger. [0069] In the third emboclimen the ontroller 15 may determine in Step:S.1 that the sum of the in w ternperaun outflow temperature is less the predetermined set valu T3, the process return to Step S3 instead of Step S. As a result. es en if the outside air teniperture changes during the hot water supplyoperation. the set value T3 can be changed according to the outside air temperature and the compressor 11 can be controlled more accurately.

[0070] I() in addition, ifte third embodiment, 'du T3 set according to the outside air temper re; It ever, the decrease amount inte rotatk.n sPeed of the compressor 11 vvh the set alue T3 is reached may also b setaccording to the ouisitle air temperature. 1710. 14 is a flowchart showing the operation of the controller 15 according to the modified e ample of the third embodiment of the present inv ntion. 15 [0071] As shown in ma 14, in the modified example, Step 54 is inserted between.: Step S1 and Step S2 of the third embodiment. In Step Sl, if the controller 15 determines that The sum of the inflow temperature and the outflow temperature is equal to or greater than the predetermined set value the pro ds to Step S4.

100721 In Step S4, the controller 15 sets the decrease amount in the rotation speed of the compressor I I according to the.outside air temperature detected by the outside am temperature detector 17.

The controller 15 stores crease amount in the rotation speed otTtlK.

compressor 11association, with the outside air temperature. In IStep. 84, the controller 15 sets the deercaac amount in the rotation speed of the compressor 11 by reading out the decrease amount in the rotation speed of the compressor Ii corresponding to the outside air temperature detected by the outside air-te peratare detector 717. The decrease. amount in the rotation speed of the compressor H may he calculated by calculat o the outside air temperature.

[0074] When the controller 15 8Lis the decreaseamount of the toLathtn speed oldie compressor 11 in Step 54, the process proce.:eds. to Step 52 and decrea I rotation Speed Of die compresSer 11 by the Set dec In this y, the controllel 5 sets the (ieci'eLtse, minim( in the rotation siee.d of compressor, 11 according to the outside air temperature detected by the outside air-temperature detector 17, so that the compressor 11 can be controlled more accura,tely. 15 100761 In the st to third embodim s the rotati n speed of the mpressor 11 is deer d when the St1111 of the111110 ernperature and the outflOw temperature reaches the predetermined set value 13; however,. the inflow temperature and the outflow temperature are different. The rotation of the coilipressor 11 maybe decreased when the produc,t reaches the set T3-In this ca, the product.d the 1.

mperature and the outflow temperature hich the discharge pressu of the compressor I I becomes the normal upper limit pressure pi at the hi gh outflow temperature may beset as the set value T3.

ven in the above case, the relation c*en the inflow temperat Ti, at the high outflow temperature and the inflow temperature T2 at the low outflow temperature where a product of the inflow temperature and the outflow temperature is the set value T3 is T1 <T2. 'Therefore, the hot water supply operation can be performed without reducing the heating capacity f the compressor even in a range -where the inflow temperature is higher at the time of a low outflow temperature than at the time of a high outflow temperature.

I00781 hi addition, instead of the sum or product of the inflow temperature and the outflow temperature, the inflow temperature and the outflow temperature are compressed using the calculated value obtained by calculating the sum, product, difference and quotient using a plurality of operators. The rotation speed of the compressor 11 may be cm-am-lied. Even in this case, if the relationship betvvven the inflow temperature TI the high outflow temperature and the inflow temperature T2 at the low outflow temperature where the calculated value of the inflow temperature and the outflow temperature is the set value 1'3 is TI-n12, the effect of the present invention can be obtained.

[0079] Fourth Embodiment The heat pump water supply apparatus 100 of the fourth embodiment will he described with reference to FIGS_ 15 and 16. HG. 15 is a flowchart showing the operation of the controller 15 according to the fourth embodiment of the present in verifier' _ FIG 16 ic a data table stored in the controller 15 according to the fourth embodiment of the present invention.

In the first to third embodiments, the rotation speed of the compressor 11 is decreased when the calculated value obtained by cakulaüng the inflow temperature and the outflow te rani:0 reaches the set value T3: howevi iii the fourth embodiment, the data when the nlues obtained from the infiowternperature and the outflow nperat e reach th set valu T3 using the table, the1rotationspeed o[ :the mpressor II is decreased.

In the fourth, embodiment< the controller 45 stores adata table as shown.. in FT. 16. In the data table: the output value Ta is stored tout qponding to the inflow temperature.: e 7.ed intothe heat exchanger 12 and the outflow temperature of water flowed out from the heat exchange 1'2. For example, when the inflow tempe e is Tint and the outflow athre is Tow'. an output value IS output. lue Ta is for example, [he sum or product of the inflow temperature and th outflow [00821 1.5 The operation of the controller 15 will be described with reference tt FL, 15.

As shown in FIG, 15, in Step 821, the controller 15 determines whether or not the output Value Ta determined from the inflow-tmperature and th Outflowtemperature is evil to Or greater, than the predetermined set value 13 or more In particular the controller 15 detettaines the output value Ta by reading out He output value Ta corresponding to the input inflow temperature and the outflow temperature using the data table shown in FIG. 16.

[0083] In Step S21, when the controller 15 dete nines that the output alue Ta is less than the predetermined set value 13, the process returns to Step 4008/11 Da S eo. when the contioller 15 determines that theoutPu alu equal to or greater than the predeter d set value T3. the process proceeds to Strp S2 to decrease the retation speed of the compressor 11.

[0085] Even if the output yalue Ta obtained from the inflow temperature and the outflow temperature by using the data table is used as in the heat pump vater supply apparatus 100 of the fourth embodiment, if the relationship between the inflow tempo:aunt. TI at the time of the high outflow ttntpualute and the inf],ow temperature T2 at the low outflow temperature where the output value Ta becomes the se value T3 is resent invention an be obtained by decreasing the rotation speed of hecoiupresor whe the output ad e Ta reacheS the set.alue T3.

[Reference Signs [dist] [0086] 10: That pump devic 1.. Compressor, 12: Heat exchanger, 13: Decompressor, Pt Eva 15: Controller, 16: Refrigerant pipe, 17: Outside air-temperature detector, 20: Hot water orage devic Hot water storage:tank 22: Circulation ou P te..npettture.dtectot, 24: Outflow temperature detector. 25: Wrater pipe, 26: Mixing valve, 27: First water supply pipe, rst hot water supply pipe. 29: Second hot water supply pipe, 30: Second water supply pipe, 31: Water supply port, 32: Hot water. 20 supply port, 41: Processor, 42: Memory. 100: Heat pump water supply apparatus

Claims

f CLADAS1 [Claim 1.) A heat pump devicecomprising: a cOiflpreESOtthaL:cOmpt:esSeg11 refrigera a beat exchanger that exchanges heat between the efrigerant compressed by the compressor arid a heat medium; a decompressor that decreases the pressure of the refrigerant; an orator that exchanges heat bet la thi., ILfilguant decompress d by the decompressor and the outside air: and I() a controller ecreases the rotation speedof the compressor when a value obtained by an halos; Wmpera Is a teiThpcauce of the heat medium that flows into the heat hanger, and tn uIT]oW IfTh1erIILLre thatis a temperature of the heat medium that.flows out of the heat exchanger reaches predetermined set va1ue,. [Claim 2] The heat pump de ice x chug to Claim 1 'herein the controller has a hi st se value and a second set value larger than the first set value as the set vaiue and when: the value obtained from the inflow te iler4ttiS and the outfhlw temperature ivictiiS the first set salue, the controller decreases the rotation speed of the compressor, and when the value reaches the second set value the controller further decreases the rotation speed of the compressor. [Claim 3] The heat pump device according.to Claim 1 01? further cnmpnsnig au outside air e per detector that detects an outside air temperature, Nrherein the..controllert he set value to a smaller value as the outside air $ temperature becomes higher.(Claim zit The heat pump device according to any one of Claims 1 to 3, wherein the controller decreases The rotation speed of the compressor when a calculated value obtained by calculating the inflow temperature and the outflow temperature reaches the set value.[Claim.5] The heat pump device according to Claim 4, wherein the controller calculates the calculated 'alue by a sum or a product of the inflow temperature and the outflow temperature& [Claim 6] A heat pump water supply apparatus, comprising: the heat pump device according to any one of Claims]. to 5; a hot water storage tank that stores water as I cheat medium a circulation pump that sends the water m the hot water storage tank to the heat exchanger; an inflow temperature detector that detects the inflow temperature; and an outflow temperature detector that detects the outflow temperature