Articles Tagged with ''hydronics''

Last month, we discussed direct-to-load hydronic heat pump systems. These systems use a variable-speed compressor and circulator to adjust heat output and flow, eliminating the need for a buffer tank or hydraulic separator.

When only the air handler is operating the heat pump is able to supply the 120 ºF water. However, when the floor heating zone and the air handler are operating at the same time and the outdoor air temperature is below 24 ºF the fluid temperature leaving the heat pump can’t climb above 103 ºF. Why is this happening, and what can be done?

The availability of heat pumps allows designers and installers of hydronic heating to include cooling. A simple method involves using a single air handler with a chilled water coil for a ducted distribution system, providing single zone cooling that can complement multi-zone hydronic heating in average houses.

A recent design approach for air-to-water and water-to-water heat pumps is "direct-to-load" piping. This method utilizes an inverter-driven scroll compressor, which operates across a wide range of speeds and can handle on/off cycling without the high inrush current typically seen in fixed-speed compressors.

A few weeks back, I received a call from an acquaintance named Jack, whom I hadn't talked to in a while. He mentioned a job opportunity and mentioned the radiators in the house have burst. We discussed the details and arranged for me to visit the location.

Last month's column discussed piping for air-to-water heat pumps. A 2-pipe system allows staging but not simultaneous heating and cooling, while a 4-pipe system with motorized valves enables both modes of operation.

An emergency call led a team to a school with a leaking boiler, which was shut down due to safety concerns. After clarifying the need for urgent repairs, the executive director approved the work. Complications arose from snow and transport challenges, but a friend connected them with a group of young workers willing to help, easing manpower concerns.

Occupants of a building using a hydro-split air-to-water heat pump are facing slow recovery after night setbacks and inadequate hot water during peak demand. The system, composed of an outdoor and indoor unit, struggles with heating efficiency. What improvements could enhance its performance?

We tackled issues at a 1953 apartment complex with a failing steam system, repairing pumps and leaks. This year, we discovered significant deterioration in the 6-inch steel steam main while preparing for its replacement, highlighting the poor condition of the aging infrastructure.

Air-to-water heat pumps, especially for larger systems, can be used in stages for efficient temperature control and flexibility, utilizing variable-speed compressors and specific piping setups to manage heating and cooling loads.