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Hydronic building systems control

  • US 10,330,336 B2
  • Filed: 08/09/2018
  • Issued: 06/25/2019
  • Est. Priority Date: 08/17/2012
  • Status: Active Grant
First Claim
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1. A method for controlling heat pump efficiency, the method comprising the steps of:

  • (a) calculating with a microprocessor controller a speed of a two-stage compressor of the heat pump to meet a demand, wherein the two-stage compressor has a first low-speed stage and a second high-speed stage;

    (b) when the microprocessor controller determines that the two-stage compressor needs to run at the first low-speed stage to meet the demand, sending by the microprocessor controller a control signal to a two-stage source side circulator causing the two-stage source side circulator to circulate a fluid to the heat pump at a low-flow rate, wherein the two-stage source side circulator is fluidly connected to the heat pump and fluidly connected to a heat exchanger;

    (c) when the microprocessor controller determines that the two-stage compressor needs to run at the second high-speed stage to meet the demand, sending by the microprocessor controller a control signal to the two-stage source side circulator causing the two-stage source side circulator to circulate the fluid to the heat pump at a high-flow rate;

    (d) substituting the one heat pump with two or more heat pumps fluidly connected to the at least one two-stage source side circulator;

    (e) substituting a variable speed source side circulator for the at least one two-stage source side circulator, and the heat exchangers are water-to-water or water-to-air heat exchangers;

    (f) calculating with the microprocessor controller a speed of one or more compressors of the two or more heat pumps to meet the demand;

    (g) calculating with the microprocessor controller a flow rate of the variable speed source side circulator to meet the demand; and

    (h) sending by the microprocessor controller a control signal to the variable speed source side circulator causing the variable speed source side circulator to circulate the fluid to the heat pump at the flow rate calculated by the microprocessor controller.

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