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A chiller system including an evaporator for evaporating a refrigerant and a water pipe in fluid communication with the evaporator. The water pipe is configured to allow water to pass through at a flow rate and to circulate the water with the evaporator to exchange heat with the refrigerant in the e

A chiller system including an evaporator for evaporating a refrigerant and a water pipe in fluid communication with the evaporator. The water pipe is configured to allow water to pass through at a flow rate and to circulate the water with the evaporator to exchange heat with the refrigerant in the evaporator. The chiller system includes a flow restrictor tube within the water pipe that is configured to allow the water to flow through the flow restrictor tube at a reduced flow rate relative to the flow rate. The chiller system also includes a measuring probe that passes through walls of the water pipe and the flow restrictor tube and includes an accuracy range of flow rates less than the flow rate. The measuring probe is configured to measure the reduced flow rate within the flow restrictor tube where the reduced flow rate is within the accuracy range.

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1. A chiller system comprising: an evaporator for evaporating a refrigerant;a water pipe in fluid communication with the evaporator, the water pipe configured to allow water to pass through at a water flow rate and to circulate the water with the evaporator to exchange heat with the refrigerant in t

1. A chiller system comprising: an evaporator for evaporating a refrigerant;a water pipe in fluid communication with the evaporator, the water pipe configured to allow water to pass through at a water flow rate and to circulate the water with the evaporator to exchange heat with the refrigerant in the evaporator;a flow restrictor tube within the water pipe configured to allow the water to flow through the flow restrictor tube at a reduced flow rate relative to the water flow rate, wherein the flow restrictor tube includes a first portion having a constant inside diameter and a tapered portion tapering in a downstream direction to a second portion having an inside diameter smaller than the constant inside diameter of the first portion, the flow restrictor tube having a longitudinal axis, the first portion having a length in the direction of the longitudinal axis being greater than a length of the tapered portion; anda measuring probe passing through walls of the water pipe and the walls of the first portion of the flow restrictor tube upstream of the tapered portion and including an accuracy range of flow rates less than the water flow rate, the measuring probe configured to measure the reduced flow rate within the flow restrictor tube, wherein the reduced flow rate is within the accuracy range. 2. The chiller system of claim 1, wherein the measuring probe is a thermal dispersion flow sensor. 3. The chiller system of claim 1, wherein the ratio of any of the diameters of the flow restrictor tube to a diameter of the water pipe is less than 0.50. 4. The chiller system of claim 3, wherein the ratio of any of the diameters of the flow restrictor tube to the diameter of the water pipe is less than 0.25. 5. The chiller system of claim 1, wherein the water flow rate is over 100centimeters per second and the reduced flow rate is less than 80centimeters per second. 6. The chiller system of claim 1, wherein the accuracy range is below 80centimeters per second. 7. The chiller system of claim 1, wherein the accuracy range is between 15 and 60 centimeters per second. 8. A method of measuring flow in a chiller system, the method comprising: evaporating a refrigerant in an evaporator;passing water through a water pipe at a water flow rate;circulating the water with the evaporator;exchanging heat between the water and the refrigerant in the evaporator;providing a measuring probe including an accuracy range of flow rates less than the water flow rate;passing the water through a flow restrictor tube within the water pipe at a reduced flow rate within the accuracy range, wherein the flow restrictor tube includes a first portion having a constant inside diameter and a tapered portion tapering in a downstream direction to a second portion having an inside diameter smaller than the constant inside diameter of the first portion, the flow restrictor tube having a longitudinal axis, the first portion having a length in the direction of the longitudinal axis being greater than a length of the tapered portion;passing the measuring probe through walls of the water pipe and the walls of the first portion of the flow restrictor tube upstream of the tapered portion; andmeasuring the reduced flow rate within the flow restrictor tube with the measuring probe. 9. The method of claim 8, wherein providing a measuring probe including an accuracy range of flow rates less than the water flow rate includes providing a thermal dispersion flow sensor with an accuracy range of between 15to 60 centimeters per second. 10. The method of claim 9, wherein passing water through a water pipe at a water flow rate includes passing water through the water pipe at a water flow rate of at least 100 centimeters per second. 11. The method of claim 10, further comprising reducing the water flow rate within the restrictor tube to the reduced flow rate of less than 80 centimeters per second. 12. A fluid flow rate measurement device for a fluid flow through a pipe, the fluid flow rate measurement device comprising: a pipe configured to allow a fluid to pass through at a fluid flow rate;a flow restrictor tube within the pipe configured to allow the fluid to flow through the flow restrictor tube at a reduced flow rate relative to the fluid flow rate, wherein the flow restrictor tube includes a first portion having a constant inside diameter and a tapered portion tapering in a downstream direction to a second portion having an inside diameter smaller than the constant inside diameter of the first portion, the flow restrictor tube having a longitudinal axis, at least one of the first portion and the second portion having a length in the direction of the longitudinal axis being greater than a length of the tapered portion; anda measuring probe passing through walls of the pipe and walls of the first portion of the flow restrictor tube upstream of the tapered portion and including an accuracy range of flow rates less than the fluid flow rate, the measuring probe configured to measure the reduced flow rate within the flow restrictor tube, wherein the reduced flow rate is within the accuracy range. 13. The fluid flow rate measurement device of claim 12, wherein the measuring probe is a thermal dispersion flow sensor. 14. The fluid flow rate measurement device of claim 12, wherein the ratio of any of the diameters of the flow restrictor tube to a diameter of the pipe is less than 0.50. 15. The fluid flow rate measurement device of claim 14, wherein the ratio of any of the diameters of the flow restrictor tube to the diameter of the pipe is less than 0.25. 16. The fluid flow rate measurement device of claim 12, wherein the accuracy range is between 15 and 60 centimeters per second. 17. The chiller system of claim 1, wherein the flow restrictor tube has a longitudinal axis, the first portion and the second portion each having a length in the direction of the longitudinal axis being greater than a length of the tapered portion. 18. The chiller system of claim 1, wherein the flow restrictor tube has a longitudinal axis, the first portion having a length in the direction of the longitudinal axis being greater than a length of the tapered portion. 19. The chiller system of claim 1, wherein the flow restrictor tube has a longitudinal axis, the first portion having a length in the direction of the longitudinal axis being greater than a length of the second portion. 20. The fluid flow rate measurement device of claim 12, wherein the flow restrictor tube has a longitudinal axis, at least one of: the first portion having a length in the direction of the longitudinal axis being greater than a length of the tapered portion, the second portion having a length in the direction of the longitudinal axis being greater than a length of the tapered portion, and the first portion having a length in the direction of the longitudinal axis being greater than a length of the second portion.