2019-12-03-PBC-min - Laserfiche WebLink

Browse Search

.5 e.o. ..-.-.tJh.e r r.v.).a..!! DJ s..c u..s sJP n. NII cfistrbated a proect evAuaflon sustaOnabMty report (refer to the attacheci report at the encs of Ns ciocurnent) Ns out neci that the Grounci Source I-leat [lurnp (GSI 11[l) or Geo therrnaIl wouki have an approxk-nate Oncrease 0n upfront cost of$600,000 over ar source VRF wuth a net Oncrease of $300,000 over a 25 year perioci. It was stateci by NIF'I that the GSI ll[l wouki have kmer ernVssVons than the aVr source VRF because there us Vss of an OectrucaIl k)aci requreci. C'Ms S darffieci that ut wouki not rnake a cfifference snce the FOL utMzes green energy crecfits for the rnunudpaIl Lino frog Fherefore, the ernussons for each systern wouki be zero. N/lark S askeci what factors were useci for the CO[l. NI""I b0eveci we useci 5 for the GSI ll[l anci 7 for the ar source VRF, but wM neeci to confirrn those. NI I aso noteci that the factors useci were baseci on rnociOng the bukfing as net zero. N/lark S saki that NII shouki run the cakuaflons as both net zero anci non net zero. A concern about the a�r source VRF �s the nose assodateci wuth the conciensng unu ts. If the FOL Oects to move forward wuth that opflon then the ciesgn tearn wM neeci to take nose Onto conskieraflon when �ayout out the equ#-nent. C'Ms S anci NI""I corm-nenteci that there as no difference an equaprnent anskie the bukfing.. ..The o0y cfifference 0s the wells anci purnps for GSIHI[l (Grounci Source Heat [lurnp) versus the eater" or conn eV unV ts. Fhere are stM purnps anci cornpressors. It was noteci that the GSI ll[l 0s a rnore resMent systern because the wells wM Vast for 501 years, whHe the fans on the ar source VRF cone eV unV ts have a 15 year Ue expectancy. Baseci on Ns Onforrnaflon a cfiscusson was heki arounci utMzOng the cieka 0n costs for these systerns to enhance the bukfings overall resMency. Nett S to coorcfinate wuth the rnechanu call en&eer what can be cione to enhance the resMency of the a source VRF, (refer to the email from Brach Park at the end of this documentforclorificotion). The FOL wM get the ciesg tearn unforrnaflon on the GSIHI[l at the I lasflngs SchooIl for cornparson of efficacy anci cost. It was noteci that aVr source VRF(VaraNe Reffigerant How) was not an opflon for the I lasflngs SchooIl ciue to the bukfing szee anci s>zee of sorne of the Varger roorns. Fhe VRF systern wouki be pracflcaIl for the [loke I IQ,anci 0s a corm-non I IVAC system for Ns type anci sze of pro�ect. Aug ackfiflonaIl resMent factor for the GSI ll[l 0s that the ciesgn capadty wM allow the systern to perforrn better on extreme weather ciays that are beyond the ciesgn. For exarnp� e, Of the systern 0s ciesgneci for ternperatures between 0 100*F anci there 0s a clay where the ternperature 0s I..O*F, then the GS[II I wM be aNe to rr4ntan the onteroor bukfing ternperature better than then ar source\/[U. It WOUH not 1,,..1e so extreme that the\/[U::: systern WC)Ulkint '.)erfonrn, [DUt We WOUH anfldpate that the systern wouki prociuce an Onteror enOronrnent of 65*F when the occupants are caMng for 68*F. PBC Meeting 12.03.19