UCONS Ductless Heat Pump Sacrament Field Demnstratin Draft Metering Prtcl Last update: 6-17-15 Overview This demnstratin is designed t evaluate the energy perfrmance, temperature distributin, and ccupant cmfrt f high efficiency, single-head, ductless heat pumps (DHP) installed in fur Sacrament area manufactured hmes. The DHPs will be sized and installed t accmmdate the pen central living/kitchen areas f the hmes. The existing HVAC (central, direct-expansin air cnditining) will be left in place and used n alternating weeks ver the study duratin. This study design, als knwn as a flip-flp study (each system is used n alternating weeks), will allw fr system perfrmance cmparisn ver similar weather patterns fr the study duratin. The ccupant will have cntrl ver bth f the installed systems, but encuraged t nly perate ne system at a time accrding t a predetermined schedule. In the event the DHP will nt satisfy ccupant cmfrt, the existing system can be re-energized and perated. The prpsed metering will capture all system energy use, including when/if bth systems are energized. While nt a statistically significant sample, this demnstratin will help t infrm the energy perfrmance, ccupant cmfrt, and the technical/practical aspects f using a single-head DHP system t displace and/r supplement central air cnditining systems in the manufactured hme setting. The demnstratin is expected t run during the mnths f July, August, and September, 2015. Research Questins 1. What fractin f the ttal cling lad will a single-head DHP be able t satisfy ver the cling seasn in fur manufactured hmes in Sacrament, CA? 2. Of the fractin f cling lad displaced, what are the resulting energy savings in cmparisn t the existing central air cnditining system? 3. What are the differences in znal temperature distributins (DHP versus existing AC) acrss the majr living znes (living rm, kitchen/dining, and bedrms) ver the study duratin? 4. In cmparisn t the central AC, hw well des the DHP prvide fr ccupant cmfrt? This research questin will be answered thrugh ccupant surveys.
Evaluatin Gals Evaluate the cling system energy use and savings via panel-level, true-pwer metering f the existing central AC system and the DHP, as perated in a flip-flp study prtcl. Using the time-series pwer measurements, evaluate the fractin f cling energy effectively displaced by the DHP. Emplying a series f stand-alne temperature data lggers, recrd and evaluated znal temperature distributin (up t 7 znes/areas per hme) fr each system ver the study duratin. Relative humidity will be recrded and evaluated in the central living HVAC zne. Assess ccupant cmfrt and system satisfactin thrugh deplyment f an ccupant survey at the utset and cmpletin f the demnstratin. Survey instrument will be develped specific t system design, installatin, cntrl, usability, and cmfrt. Appendix A presents a sample survey this will be mdified specific t this study. Mnitring Apprach End-use metering at electrical panel f existing central AC (cmpressr, cndensing fan, air handler, and auxiliaries) and DHP circuit. Whle building/mains electrical metering Recmmend true pwer, rt mean square (RMS), measurements and data recrding fr all electrical metering. Request 30-day (i.e., typical billing cycle) electric utility data. Target 2 years pre-retrfit and duratin f pst-retrfit perid. If available, request any utility interval (i.e. 15 minute) data. All utility data access will require custmer cnsent. Space temperature and relative humidity (RH). Multiple pint temperature and RH lgging f affected znes. Lcatins t be cnsidered: Partitined znes (bedrms/ther) Main living space Thermstat lcatin Air delivery temperature. Delivered air temperature fr existing and DHP pump systems Delivery head f DHP Existing duct supply air diffuser, validate use and when/if ducts are t be used fr distributin Demnstratin site utdr air temperature (ptinal - data can be dwnladed frm lcal weatherstatin ). All metering prpsed t use 1-5 minute integratin interval fr a higher reslutin data set. Appendix B presents prpsed metering equipment.
Table 1 presents prpsed lcatins. Actual deplyments will be made after hme audits are cmpleted. Table 1. Temperature/RH Metering Lcatins and Names Pint name Measurement Ntes T1 Existing thermstat temperature Gives cntrl pint f ccupant setting T2 Main living space temperature Temperature affected by DHP T3 Bedrm 1 temperature Bedrm temperature T4 Bedrm 2 temperature Bedrm temperature T5 DHP delivery temperature Delivery air temperature f DHP T6 Existing system delivery temperature Delivery air temperature f existing system RH Main living space relative humidity Single pint RH in main living space T6 T3 T1 T5 T4 RH 1 T2 Figure 1. Sample Lgger Placement Pints Typical Manufactured Hme
Deplyment Prtcl Lgger lgistics. Lggers will be pre-labeled and cme in grups f seven. Each grup will be alltted t ne hme. Lggers 1-6 are temperature lggers and placement will be dictated as described in Table 1 and shwn in Figure 1. Lgger 7 is the relative humidity (RH) lgger and this shuld be installed in the main living space served by the DHP. Lgger installatin guidance is prvided belw in Installatin Ntes. Installatin Ntes All space temperature lggers t be placed n interir space/walls at height between 3 and 5 frm flr. Discunt lcatins where lgger will be influenced by heat/cling surces, e.g., sun light, utside drs/windws, lighting, TVs, AV equipment, kitchen appliances, HVAC ducts, etc. Cnsider lcatins where device des nt have t be physically attached t surface, e.g., shelf, bkcase, tp f thermstat, etc. Where attachment is necessary, cnsider side tabs, wire ties, duble sided tape, magnets (all included). DHP Delivery and Existing System Delivery lggers need t be attached t the respective supply diffuser such that the lgger thermister (black circle n tp) sees the delivered air when system is perating. Fr attachment t diffuser, cnsider Velcr strap (included) r wire ties fr affixing t diffuser hardware/supprts. Dcumentatin left with the custmer shuld include instructins f nt t mve the lggers and a UCONS pint f cntact fr issues and questins.
Appendix A. Sample Custmer Survey please nte that this is prvided as a sample-nly. Final survey instrument will be develped upn system selectin and installatin. UCONS DHP Pilt. Sample Custmer Survey Hme Number: Hme Address: Persn filling ut survey: Date: 1. Did the installers and evaluatr teams address yur questins and needs during the evaluatin prgram? О Yes О N 2. Hw wuld yu rate the ductless heat pump (DHP) n the fllwing? Belw Abve Pr Average Average Average Excellent Ease f use О О О О О О Cmfrt О О О О О О Quietness f head О О О О О О Quietness f cmpressr О О О О О О Air Distributin О О О О О О Temperature Distributin О О О О О О Appearance О О О О О О Dn t Knw 3. During the DHP prtin f the pilt evaluatin did yu use supplemental cling? О Existing central AC О Windw/wall unit О Did nt use supplemental cling (skip t questin 7) 4. Hw ften did yu use supplemental cling? О Seldm (less than 10% f the time) О Smewhat ften (10% t 25% f the time) О Often (25% t 50% f the time) О Very Often (50% t 75% f the time) 5. In what rms (chse all that apply)? О Entire hme (central system) О Main living area О Bedrm 1 О Bedrm 2 О Bedrm 3 О Other
6. Under what circumstances was the supplemental cling system used and why? 7. What were the primary benefits when the DHP system was running? 8. Did yu have any prblems with the DHP? О Yes О N (skip t questin 10) 9. What were they? 10. Hw did yu use the DHP t benefit yur needs? 11. Did yu ntice any changes in cmfrt r temperature in any areas, rms, r znes during the DHP prtin f the pilt? О Yes О N (skip t questin 13) 12. If yes, what areas f yur hme were these nticeable, and with what utcme? 13. Over the curse f the pilt, did yu tend t change the temperature set pint f the DHP? О During the day О During the evening О Overnight О Other О Did nt change the temperature set pint 14. What did yu like best abut the DHP system? 15. What did yu like least abut the DHP system? 16. In what ways culd the DHP system be imprved fr better use in a hme like yurs?
17. Overall, hw satisfied are yu with the ductless heat pump yu received? О Very satisfied О Smewhat satisfied О Neutral О Smewhat dissatisfied О Very dissatisfied 18. If yu are dissatisfied, please tell us why: 19. Additinal Cmments:
Appendix B. Metering Equipment Data Lggers A. Temperature Mnitring Cnsider Onset Cmputer Hb data lgger series fr temperature measurements. 1. Temperature nly. Hb UX 100-001 Range: -20 t 70 C (-4 t 158 F) Accuracy: ±0.21 C frm 0 t 50 C (±0.38 F frm 32 t 122 F) Memry: 84,650 readings 58 days at 1 minute intervals Size: 3.66 x 5.94 x 1.52 cm (1.44 x 2.34 x 0.6 in.) Price: TBD 2. Temperature and relative humidity. Hb UX 100-003 Range: -20 t 70 C (-4 t 158 F) Accuracy: Temp: ±0.21 C frm 0 t 50 C (±0.38 F frm 32 t 122 F), RH: ±3.5% frm 25% t 85% ver the range f 15 t 45 C (59 t 113 F) including hysteresis Memry: 84,650 readings 58 days at 1 minute intervals Size: 3.66 x 8.48 x 2.29 cm (1.44 x 3.34 x 0.9 in.) Price: TBD
3. Outdr Temperature and relative humidity. Hb UX 23-001 Range: -20 t 70 C (-4 t 158 F) Accuracy: Temp: ±0.21 C frm 0 t 50 C (±0.38 F frm 32 t 122 F), RH: ±2.5% frm 10% t 90% RH (typical), t a maximum f ±3.5% including hysteresis. Memry: 21,000 readings 15 days at 1 minute intervals, 840 days at 1 hur intervals Size: 10.2 3.8 cm (4.0 1.5 in.) Price: TBD B. Energy Mnitring 1. Cnsider Wattnde pulse true RMS meter (ne fr each 240 lad) Price: TBD Specs: http://www.ccntrlsys.cm/w/wattnde_pulse_-_mdels 2. Current transfrmers (tw fr each 240 lad)
Price: TBD Specs: http://www.ccntrlsys.cm/w/current_transfrmers 3. Pulse cllecting data lgger (1 per hme) Price: TBD Specs: http://www.nsetcmp.cm/prducts/data-lggers/ux120-017