ASHRAE Journal - January 2020 - 46

TECHNICAL FEATURE

TABLE 2 Data items and units can be displayed in the pump room.
ITEM

SYMBOL

UNIT

Time

Date

d

Total System Power

Psys

kW

Unit 1 Power

P1

kW

Unit 2 Power

P1

kW

Circulating Pump Power

Pp

kW

Unit 1 Evaporator Inlet Water Temperature

t1ei

°C

Unit 1 Evaporator Inlet Water Temperature

t1eo

°C

Unit 1 Evaporator Inlet Water Temperature

t1ci

°C

Unit 1 Evaporator Inlet Water Temperature

t1co

°C

Unit 2 Evaporator Inlet Temperature

t2ei

°C

Unit 2 Evaporator Inlet Temperature

t2eo

°C

Unit 2 Evaporator Inlet Temperature

t2ci

°C

Unit 2 Evaporator Inlet Temperature

t2co

°C

Total Ground Source Side System Flow

qsys-g

m3 /h

The Total Flow Rate of the Air Conditioning Side System

qsys-a

m3 /h

Unit 1 Evaporator Flow

q1-g

m3 /h

Unit 1 Evaporator Flow

q1-a

m3 /h

Air Conditioning Water Supply Temperature

tai

°C

Air Conditioning Water Supply Temperature

tao

°C

Groundwater Supply Temperature

tgi

°C

Groundwater Supply Temperature

tgo

°C

Unit 1 Cumulative Quantity of Electricity

Q1

kW·h

Total Cumulative Power of the System

Qsys

kW·h

Unit 1 COP

COP1

The System COP

COPsys

hole temperature rose slowly. The temperature of the
main hole increases at a constant rate from 2°C (36°F)
to 18°C (64°F) in the course of the transitional season;
although there were fluctuations, the outdoor temperature generally decreased. The highest temperature was
26°C (79°F) in August, and the lowest was 6°C (43°F) in
September. Some of the data used in the research content of this article are shown in Table 2. The monitoring
system provided access to a wide range of equipment
power, evaporators, condensers, and inlet and outlet
temperatures and flows. The monitoring and measurement test was divided into two parts: the monitoring
part of the underground heat-exchanging well and the
unit pumping station, and the indoor system inspection
section, respectively. R. Karabacak, et al., attempted to
reveal the relationship between cooling performance
and meteorological data of ground source heat pump
46

ASHRAE JOURNAL

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JAN UARY 2020

FIGURE 4 Temperature variation curve of the main heat exchanger with (A) 4 m,
(B) 5 m, (C) and 6 m intervals.

A

4m
Temperature
August 1, 2016
October 1, 2016
December 17, 2016

B

5m

Temperature
August 1, 2016
October 1, 2016
December 27, 2016

C

6m

Temperature
August 1, 2016
October 1, 2016
December 17, 2016

systems, their study considered meteorological data
including solar radiation, wind speed, relative humidity, and ambient temperature. The results proved that
COP increased with the decreasing of solar radiation and
wind speed.19

Temperature Variations in Underground Heat Transfer Systems
Figure 4 indicates that the heat flow along the length
of the tube was not a constant value. The heat flux along
the length of the tube can distinguish the temperature
distribution between the water supply pipe side and the
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ASHRAE Journal - January 2020

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