PDF Publication Title:
Text from PDF Page: 061
Figure 7-17 outside air rev. valve outdoor unit outside air air/dirt/mag separator variable-speed pressure-regulated circulator air vent purge valves spring check zone valves purge valves inline electric heating elements indoor unit split system air-to-water magnetic heat pump dirt 3-pipe buffer tank configuration (in heating mode) separator 2-STAGE ROOM THERMOSTAT Two-stage room thermostats have been extensively used in single zone forced-air systems using air-to-air heat pumps equipped with electric strip heat. If the room thermostat was unable to maintain the room setpoint temperature using the heat pump alone, the 2nd stage of the thermostatic would operate a contactor that in turn turned on the electric strip heaters in the supply air plenum. It was also possible to set the thermostat to “emergency” mode when the heat pump was down for service. This would operate the electric strip heat as the system’s sole heat source. Two-stage room thermostats were designed for this type of low thermal mass, single zone system. As such they are not well-suited for higher thermal mass hydronic systems, especially those with multiple zones. 2-STAGE SETPOINT CONTROL Two-stage setpoint control based on the temperature in a buffer tank is a simple control technique for a hydronic system where the air-to-water heat pump serves as the first stage heat source with a boiler serving as second stage heat source. A single temperature sensor in the buffer tank provided feedback to the 2-stage controller. Each stage of heat input has a setpoint and differential, both of which are adjustable. One possible control configuration for a low-temperature distribution system is given in Figure 7-18. Figure 7-18 OFF 110 oF OFF 105 oF ON 100 oF air-to-water heat pump 95 oF ON auxiliary heat source 10 oF differential stage 1 stage 2 10 oF differential condenser heating mode refrigerant line set inside compressor TXV evaporator outside 61PDF Image | Heat Pump Systems 2020
PDF Search Title:
Heat Pump Systems 2020Original File Name Searched:
idronics_27_na.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)