ASHRAE IGSHPA. k G T G

Transcription

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2

3 W in Q H Q L

4

5 ASHRAE ISHPA CEES k T S

6 k 2 ft day k Btu ft F k k k k 3 lb ft 2 W m K C km T

7 A 2 X 365 T T exp X cos (t t ) s now sift F T F A s 2 ft day ft X t now t sift T,max T,min T,min T 0.5 As exp X 365 T,max T 0.5 As exp X 365 T

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9 L c L L L Max L,L c L L c L L c Q R (C Q ) (R F R C R ) a,a c c b m,c,m sc,d T T T W,c p Q R (C Q ) (R F R C R ) a,a b m,,m sc,d T T T W, p Btu Q a Q a C Q C Q c c c 8760 C C c COP COP EER EER COP EER C C c C c EER C COP Q c Q Btu Q Q c y c ft F Btu R,d R,m R,a

10 P P d P m Fo P a Fo 4 t D 2 eqv ft t D eqv ft m m in Fo d P d P m P a Fo a Fo m d Fo a Fo m Fo d a m R k R,d a m d R,a R,m ft F Btu R p R p

11 R p ft F Btu gpm ft F Btu gpm gpm gpm in F m, F m,c F F m,c m, F F c DOHc DOM DOH DOM F c F

12 F F c c c day DOH DOH c day mont DOM C sc C sc C SC gpm ton F T W,c T W, TW, 0.5 (TWi, T Wo, ) TW,c 0.5 (TWi,c T Wo,c ) T Wi, T Wi,c F T Wo, T Wo,c F T p F T p

13 T p F k Btu ft F ft T p F k 1.5 k 1 k 1.5 k 1 k 1.5 k 1 ft c L L c Q Q c COP 1 R R F COP T T P,min Wi, COP 1 R R F c P c COP T T c Wi,c,max kw Q c Q COP c COP m K kw R p R p Ln(D D ) out 2 k P in m D in D out kw m K k P m K kw R R 1 D out 2 kw m K C T,max T,min

14 T Wi,c T Wi, C L L c QEva, 1 Ln(Dout D in ) F T T 2 D 4 k 2 D W, W, in p out QCon,c 1 Ln(Dout D in ) Fc T T 2 D 4 k 2 D W,c W,c in p out kw Q Eva, C T W,c T W, 2 kw (m K) W,c W, kw Q Con,c ft L 1 L 1ft ton F in k 1.2 Btu ft F ka 0.85 Btu ft F L L L1 C CA C A L C

15 L 1 C A C k A k C A k A Btu ft F C k Btu ft F E rej Lc T Wi,c T E abs L T T Wi, MJ y E rej E Q rej c c 1 COP COP c c MJ y E abs E Q abs COP 1 COP C C T Wi, T Wi,c

16 m m m 35 C 4 C 39 C 1 C kw kw /y /y /y /y 2/ 4W (m C) 16 C 2 1/ 09ft day 2 12W (m C)

17 m m ASHRAE ISHPA CEES ASHRAE ASHRAE

18 ASHRAE C A s day mont Btu day MJ y 2 kw (m C) kw kw kw (m C) m in C COP D DOH DOM E F Fo k L P Q Q H Q L 2 kw m K kw ft F Btu C ft C R t T T W in X 2 ft day

19 y y a A abs c Con d eqv Eva i in m min max o out p rej W ASHRAE CEES ISHPA

20 1. Omer A. M., 2008, "round-source eat pumps systems and applications", Renewable and Sustainable Energy Reviews, Vol. 12, Deng Z., 2004, "Modeling of Standing Column Wells in round Source Heat Pump Systems", submitted to te Oklaoma State niversity for te degree of P. D. 3. Rafferty K., 2003, "eotermal Heat Pump Systems: An Introduction", Water Well Journal,. 4. Van Wylen. J., Sonntag R. E., "Fundamentals of Classical Termodynamics", 4 t Ed, Jon Wiley & Sons Inc., Kavanaug S. P., Rafferty K., 1997, "round-source Heat Pumps: Design of eotermal Systems for Commercial and Institutional Buildings", ASHRAE Inc., Atlanta,. 6. RETScreen International, 2005, "round Source Heat Pump Project Analysis", Minister of Natural Resources, Canada. 7. Sanaye S., Niroomand B., 2009, "Termal-economic Modeling and Optmization of Vertical round-coupled Heat Pump", Energy Conversion and Management, Vol. 50, ,. 8. Kavanaug S. P., Calvert T. H., 1995, "Performance of round Source Heat Pumps in Nort Alabama", Final Report. Alabama niversities and Tennessee Valley Autority Researc Consortium, niversity of Alabama, Tuscaloosa. 9. CANMET Energy Tecnology Centre, 2002, "Commercial Eart Energy Systems", Natural Resources Publication, Canada. 10. "eotermal Heat Pump Design Manual",2002, McQuay Air Conditioning Application uide, nited States. 11. ECONAR ENERY SYSTEMS, 1993, "eosource Heat Pump Handbook", Nortland Heat Pump Association, Canada. 12. Kasuda, T., Arcenbac, P.R. 1965, "Eart Temperature and Termal Diffusivity at Selected Stations in te nited States", ASHRAE Transactions, Vol. 71, Part 1. Investigating te effective parameters and various metods of computing te boreole dept of vertical ground eat excanger of geotermal eat pump *Setare Merkou *raduate Scool of Energy & te Environment, Science & Researc Branc, Islamic Azad niversity, Teran, Iran Abstract In geotermal eat pumps, te eat excange wit ground is performed by te ground eat excanger. In fact, te ground eat excanger is installed to extract or inject te termal energy from/to te eart. Te boreole dept of tis eat excanger as a major effect on te system investment cost and operation; tus, tis parameter must be computed wit a ig accuracy. Tere are various metods to compute te boreole dept of ground eat excanger. Te geotermal eat pump capacity and te regional

21 soil caracteristics are te main parameters wic affect te boreole dept and size of te ground eat excanger. In tis paper, te important soil caracteristics are first introduced. Ten, te main five metods for computing te boreole dept of ground eat excanger are investigated wit teir effective parameters. Finally, tese metods are compared and teir application priority is determined. Keywords: "eotermal eat pump", "Vertical ground eat excanger", "Boreole dept", "Heat pump capacity", "round temperature"

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