PDF Publication Title:
Text from PDF Page: 036
Figure 14. PTHP schematic. Image source: https://www.greenbuildingadvisor.com/app/uploads/sites/default/files/Heating%20Options%20for%20a%20Small%20Home.pdf Where: Use Today and Retrofit Applications PTHP technology is employed in warmer climates of the U.S., especially in hotels where room-by-room heating and cooling needs can vary greatly. Approximately 400,000 apartments in the U.S. (5%) have gas room heaters or gas wall furnaces, the majority of which are in the Cold/Very Cold climate zones. Gas PTACs may also be found in hotels. Why: Benefits of this Typology Gas room heaters are generally located on the exterior wall of a room in an apartment for gas venting purposes and for the condenser component of any combined cooling equipment in the case of a gas PTAC. The location of the equipment, the required electrical service to the location, and the existing wall penetration are all required for a PTHP installation. While some modifications to the wall opening size may be needed, the retrofit of PTHPs to replace gas room heaters is the most straightforward path from gas heating to electric heat pumps. Many gas room heaters have a similar size electric heat pump version, sometimes by the same manufacturer. Each heater maintains complete independence from other HVAC equipment and energy use billing is as simple as making sure the electricity used by the PTHP ties into the occupant’s electricity panel. Maintenance requirements are the same as for a gas PTAC, though any gas heater component of the maintenance routine is removed. There is no need for exhaust venting of a gas component. Packaged heat pumps are factory assembled and leak-tested, so there is little chance of refrigerant leakage due to installation quality compared to split systems or central heat pump systems. Installation is also simplified since there is no requirement for field leak testing, which requires a return visit by the installer. Compared to gas PTACs or similar equipment, a packaged heat pump replacement may be equivalent in equipment cost. Labor for potential wall opening modifications is the only source of additional cost, making this technology the least expensive option for electrification of fossil fuel systems. Why Not: Plausibility Concerns The limited current PTHP technology offerings will likely require some amount of envelope modification to fit the new equipment. The envelope work can be coordinated with other required façade work, but in any case, wall modifications are an added complexity to a PTHP retrofit. While product design and installation can reduce thermal bridging and air leakage, a PTHP requires some, typically large, wall penetration that has neither the insulation, thermal mass, nor the air tightness of a solid wall. Insulation and air sealing may be sidelined as cost-cutting measures in the design and installation of PTHPs, so care in the technology development and selection, as well as in the skill of the installers, is very important to realizing energy efficiency gains. Steven Winter Associates,Inc. 36PDF Image | HEAT PUMP RETROFIT STRATEGIES FOR MULTIFAMILY BUILDINGS
PDF Search Title:
HEAT PUMP RETROFIT STRATEGIES FOR MULTIFAMILY BUILDINGSOriginal File Name Searched:
heat-pump-retrofit-strategies-report-05082019.pdfDIY PDF Search: Google It | Yahoo | Bing
CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
Heat Pumps CO2 ORC Heat Pump System Platform More Info
CONTACT TEL: 608-238-6001 Email: greg@infinityturbine.com (Standard Web Page)