Michael C Schwedler

20040000155, Jan 1, 2004

Jul 1, 2002

10/188562

Lee Cline - West salem WI, US
Michael Schwedler - La Crosse WI, US

F25D017/02

062/175000, 062/201000

To provide chilled water, a variable-primary-flow system includes two variable speed pumps that pump water through a first chiller and a second chiller. A control energizes the second chiller in response to a cooling demand exceeding that what can be met by the first chiller operating alone, and de-energizes the second chiller upon the cooling demand decreasing to a level below the first chiller's maximum capacity. When both chillers are operating, the capacities of the chillers are modulated in unison to meet the cooling demand. Likewise, when both pumps are running, their speed is modulated in unison to provide a desired pressure.

20160356530, Dec 8, 2016

Aug 22, 2016

15/243095

- Davidson NC, US
Michael C.A. Schwedler - La Crosse WI, US
Susanna S. Hanson - La Crosse WI, US
Brian J. Fiegen - Onalaska WI, US

F25B 29/00
F25B 49/02
F25B 30/06

A multi-mode, bi-directional cascade heat pump system, according to some examples, includes at least two chillers each being part of a unidirectional refrigerant circuit. The system includes heat exchangers each of which are dedicated to operate as just a condenser or as just an evaporator, regardless of the system's operating mode. In some modes, a secondary fluid transfers heat between the condenser of one chiller and the evaporator of another chiller before the fluid returns to a secondary fluid source such as, for example, a geothermal borefield or a conventional water source. In some embodiments, fluid is withdrawn from a borefield by way of a pump having a speed that varies to maintain a desired fluid temperature and/or a desired heat transfer rate at the borefield. The heat pump system includes means for minimizing flow through the borefield and for minimizing unnecessary mixing of relatively high and low temperature fluid.

20160356531, Dec 8, 2016

Aug 22, 2016

15/243039

- Davidson NC, US
Michael C.A. Schwedler - La Crosse WI, US
Susanna S. Hanson - La Crosse WI, US
Brian J. Fiegen - Onalaska WI, US

F25B 30/06
F25B 29/00

A multi-mode, bi-directional cascade heat pump system, according to some examples, includes at least two chillers each being part of a unidirectional refrigerant circuit. The system includes heat exchangers each of which are dedicated to operate as just a condenser or as just an evaporator, regardless of the system's operating mode. In some modes, a secondary fluid transfers heat between the condenser of one chiller and the evaporator of another chiller before the fluid returns to a secondary fluid source such as, for example, a geothermal borefield or a conventional water source. In some embodiments, fluid is withdrawn from a borefield by way of a pump having a speed that varies to maintain a desired fluid temperature and/or a desired heat transfer rate at the borefield. The heat pump system includes means for minimizing flow through the borefield and for minimizing unnecessary mixing of relatively high and low temperature fluid.